blender/intern/cycles/render/nodes.cpp

/*
 * Copyright 2011-2013 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "image.h"
#include "integrator.h"
#include "nodes.h"
#include "scene.h"
#include "svm.h"
#include "svm_color_util.h"
#include "svm_ramp_util.h"
#include "svm_math_util.h"
#include "osl.h"
#include "constant_fold.h"

#include "util_sky_model.h"
#include "util_foreach.h"
#include "util_logging.h"
#include "util_transform.h"

CCL_NAMESPACE_BEGIN

/* Texture Mapping */

#define TEXTURE_MAPPING_DEFINE(TextureNode) \
	SOCKET_POINT(tex_mapping.translation, "Translation", make_float3(0.0f, 0.0f, 0.0f)); \
	SOCKET_VECTOR(tex_mapping.rotation, "Rotation", make_float3(0.0f, 0.0f, 0.0f));      \
	SOCKET_VECTOR(tex_mapping.scale, "Scale", make_float3(1.0f, 1.0f, 1.0f));            \
	\
	SOCKET_VECTOR(tex_mapping.min, "Min", make_float3(-FLT_MAX, -FLT_MAX, -FLT_MAX)); \
	SOCKET_VECTOR(tex_mapping.max, "Max", make_float3(FLT_MAX, FLT_MAX, FLT_MAX));    \
	SOCKET_BOOLEAN(tex_mapping.use_minmax, "Use Min Max", false);                     \
	\
	static NodeEnum mapping_axis_enum;                      \
	mapping_axis_enum.insert("none", TextureMapping::NONE); \
	mapping_axis_enum.insert("x", TextureMapping::X);       \
	mapping_axis_enum.insert("y", TextureMapping::Y);       \
	mapping_axis_enum.insert("z", TextureMapping::Z);       \
	SOCKET_ENUM(tex_mapping.x_mapping, "x_mapping", mapping_axis_enum, TextureMapping::X); \
	SOCKET_ENUM(tex_mapping.y_mapping, "y_mapping", mapping_axis_enum, TextureMapping::Y); \
	SOCKET_ENUM(tex_mapping.z_mapping, "z_mapping", mapping_axis_enum, TextureMapping::Z); \
	\
	static NodeEnum mapping_type_enum;                            \
	mapping_type_enum.insert("point", TextureMapping::POINT);     \
	mapping_type_enum.insert("texture", TextureMapping::TEXTURE); \
	mapping_type_enum.insert("vector", TextureMapping::VECTOR);   \
	mapping_type_enum.insert("normal", TextureMapping::NORMAL);   \
	SOCKET_ENUM(tex_mapping.type, "Type", mapping_type_enum, TextureMapping::TEXTURE); \
	\
	static NodeEnum mapping_projection_enum;                                                \
	mapping_projection_enum.insert("flat", TextureMapping::FLAT);                           \
	mapping_projection_enum.insert("cube", TextureMapping::CUBE);                           \
	mapping_projection_enum.insert("tube", TextureMapping::TUBE);                           \
	mapping_projection_enum.insert("sphere", TextureMapping::SPHERE);                       \
	SOCKET_ENUM(tex_mapping.projection, "Projection", mapping_projection_enum, TextureMapping::FLAT);

TextureMapping::TextureMapping()
{
}

Transform TextureMapping::compute_transform()
{
	Transform mmat = transform_scale(make_float3(0.0f, 0.0f, 0.0f));

	if(x_mapping != NONE)
		mmat[0][x_mapping-1] = 1.0f;
	if(y_mapping != NONE)
		mmat[1][y_mapping-1] = 1.0f;
	if(z_mapping != NONE)
		mmat[2][z_mapping-1] = 1.0f;
	
	float3 scale_clamped = scale;

	if(type == TEXTURE || type == NORMAL) {
		/* keep matrix invertible */
		if(fabsf(scale.x) < 1e-5f)
			scale_clamped.x = signf(scale.x)*1e-5f;
		if(fabsf(scale.y) < 1e-5f)
			scale_clamped.y = signf(scale.y)*1e-5f;
		if(fabsf(scale.z) < 1e-5f)
			scale_clamped.z = signf(scale.z)*1e-5f;
	}
	
	Transform smat = transform_scale(scale_clamped);
	Transform rmat = transform_euler(rotation);
	Transform tmat = transform_translate(translation);

	Transform mat;

	switch(type) {
		case TEXTURE:
			/* inverse transform on texture coordinate gives
			 * forward transform on texture */
			mat = tmat*rmat*smat;
			mat = transform_inverse(mat);
			break;
		case POINT:
			/* full transform */
			mat = tmat*rmat*smat;
			break;
		case VECTOR:
			/* no translation for vectors */
			mat = rmat*smat;
			break;
		case NORMAL:
			/* no translation for normals, and inverse transpose */
			mat = rmat*smat;
			mat = transform_inverse(mat);
			mat = transform_transpose(mat);
			break;
	}

	/* projection last */
	mat = mat*mmat;

	return mat;
}

bool TextureMapping::skip()
{
	if(translation != make_float3(0.0f, 0.0f, 0.0f))
		return false;
	if(rotation != make_float3(0.0f, 0.0f, 0.0f))
		return false;
	if(scale != make_float3(1.0f, 1.0f, 1.0f))
		return false;
	
	if(x_mapping != X || y_mapping != Y || z_mapping != Z)
		return false;
	if(use_minmax)
		return false;
	
	return true;
}

void TextureMapping::compile(SVMCompiler& compiler, int offset_in, int offset_out)
{
	compiler.add_node(NODE_MAPPING, offset_in, offset_out);

	Transform tfm = compute_transform();
	compiler.add_node(tfm.x);
	compiler.add_node(tfm.y);
	compiler.add_node(tfm.z);
	compiler.add_node(tfm.w);

	if(use_minmax) {
		compiler.add_node(NODE_MIN_MAX, offset_out, offset_out);
		compiler.add_node(float3_to_float4(min));
		compiler.add_node(float3_to_float4(max));
	}

	if(type == NORMAL) {
		compiler.add_node(NODE_VECTOR_MATH, NODE_VECTOR_MATH_NORMALIZE, offset_out, offset_out);
		compiler.add_node(NODE_VECTOR_MATH, SVM_STACK_INVALID, offset_out);
	}
}

/* Convenience function for texture nodes, allocating stack space to output
 * a modified vector and returning its offset */
int TextureMapping::compile_begin(SVMCompiler& compiler, ShaderInput *vector_in)
{
	if(!skip()) {
		int offset_in = compiler.stack_assign(vector_in);
		int offset_out = compiler.stack_find_offset(SocketType::VECTOR);

		compile(compiler, offset_in, offset_out);

		return offset_out;
	}

	return compiler.stack_assign(vector_in);
}

void TextureMapping::compile_end(SVMCompiler& compiler, ShaderInput *vector_in, int vector_offset)
{
	if(!skip()) {
		compiler.stack_clear_offset(vector_in->type(), vector_offset);
	}
}

void TextureMapping::compile(OSLCompiler &compiler)
{
	if(!skip()) {
		Transform tfm = transform_transpose(compute_transform());

		compiler.parameter("mapping", tfm);
		compiler.parameter("use_mapping", 1);
	}
}

/* Image Texture */

NODE_DEFINE(ImageTextureNode)
{
	NodeType* type = NodeType::add("image_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(ImageTextureNode);

	SOCKET_STRING(filename, "Filename", ustring(""));

	static NodeEnum color_space_enum;
	color_space_enum.insert("none", NODE_COLOR_SPACE_NONE);
	color_space_enum.insert("color", NODE_COLOR_SPACE_COLOR);
	SOCKET_ENUM(color_space, "Color Space", color_space_enum, NODE_COLOR_SPACE_COLOR);

	SOCKET_BOOLEAN(use_alpha, "Use Alpha", true);

	static NodeEnum interpolation_enum;
	interpolation_enum.insert("closest", INTERPOLATION_CLOSEST);
	interpolation_enum.insert("linear", INTERPOLATION_LINEAR);
	interpolation_enum.insert("cubic", INTERPOLATION_CUBIC);
	interpolation_enum.insert("smart", INTERPOLATION_SMART);
	SOCKET_ENUM(interpolation, "Interpolation", interpolation_enum, INTERPOLATION_LINEAR);

	static NodeEnum extension_enum;
	extension_enum.insert("periodic", EXTENSION_REPEAT);
	extension_enum.insert("clamp", EXTENSION_EXTEND);
	extension_enum.insert("black", EXTENSION_CLIP);
	SOCKET_ENUM(extension, "Extension", extension_enum, EXTENSION_REPEAT);

	static NodeEnum projection_enum;
	projection_enum.insert("flat", NODE_IMAGE_PROJ_FLAT);
	projection_enum.insert("box", NODE_IMAGE_PROJ_BOX);
	projection_enum.insert("sphere", NODE_IMAGE_PROJ_SPHERE);
	projection_enum.insert("tube", NODE_IMAGE_PROJ_TUBE);
	SOCKET_ENUM(projection, "Projection", projection_enum, NODE_IMAGE_PROJ_FLAT);

	SOCKET_FLOAT(projection_blend, "Projection Blend", 0.0f);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_UV);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(alpha, "Alpha");

	return type;
}

ImageTextureNode::ImageTextureNode()
: ImageSlotTextureNode(node_type)
{
	image_manager = NULL;
	slot = -1;
	is_float = -1;
	is_linear = false;
	builtin_data = NULL;
	animated = false;
}

ImageTextureNode::~ImageTextureNode()
{
	if(image_manager) {
		image_manager->remove_image(filename.string(),
		                            builtin_data,
		                            interpolation,
		                            extension,
		                            use_alpha);
	}
}

ShaderNode *ImageTextureNode::clone() const
{
	ImageTextureNode *node = new ImageTextureNode(*this);
	node->image_manager = NULL;
	node->slot = -1;
	node->is_float = -1;
	node->is_linear = false;
	return node;
}

void ImageTextureNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
#ifdef WITH_PTEX
	/* todo: avoid loading other texture coordinates when using ptex,
	 * and hide texture coordinate socket in the UI */
	if(shader->has_surface && string_endswith(filename, ".ptx")) {
		/* ptex */
		attributes->add(ATTR_STD_PTEX_FACE_ID);
		attributes->add(ATTR_STD_PTEX_UV);
	}
#endif

	ShaderNode::attributes(shader, attributes);
}

void ImageTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *color_out = output("Color");
	ShaderOutput *alpha_out = output("Alpha");

	image_manager = compiler.image_manager;
	if(is_float == -1) {
		bool is_float_bool;
		slot = image_manager->add_image(filename.string(),
		                                builtin_data,
		                                animated,
		                                0,
		                                is_float_bool,
		                                is_linear,
		                                interpolation,
		                                extension,
		                                use_alpha);
		is_float = (int)is_float_bool;
	}

	if(slot != -1) {
		int srgb = (is_linear || color_space != NODE_COLOR_SPACE_COLOR)? 0: 1;
		int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

		if(projection != NODE_IMAGE_PROJ_BOX) {
			compiler.add_node(NODE_TEX_IMAGE,
				slot,
				compiler.encode_uchar4(
					vector_offset,
					compiler.stack_assign_if_linked(color_out),
					compiler.stack_assign_if_linked(alpha_out),
					srgb),
				projection);
		}
		else {
			compiler.add_node(NODE_TEX_IMAGE_BOX,
				slot,
				compiler.encode_uchar4(
					vector_offset,
					compiler.stack_assign_if_linked(color_out),
					compiler.stack_assign_if_linked(alpha_out),
					srgb),
				__float_as_int(projection_blend));
		}

		tex_mapping.compile_end(compiler, vector_in, vector_offset);
	}
	else {
		/* image not found */
		if(!color_out->links.empty()) {
			compiler.add_node(NODE_VALUE_V, compiler.stack_assign(color_out));
			compiler.add_node(NODE_VALUE_V, make_float3(TEX_IMAGE_MISSING_R,
			                                            TEX_IMAGE_MISSING_G,
			                                            TEX_IMAGE_MISSING_B));
		}
		if(!alpha_out->links.empty())
			compiler.add_node(NODE_VALUE_F, __float_as_int(TEX_IMAGE_MISSING_A), compiler.stack_assign(alpha_out));
	}
}

void ImageTextureNode::compile(OSLCompiler& compiler)
{
	ShaderOutput *alpha_out = output("Alpha");

	tex_mapping.compile(compiler);

	image_manager = compiler.image_manager;
	if(is_float == -1) {
		if(builtin_data == NULL) {
			ImageManager::ImageDataType type;
			type = image_manager->get_image_metadata(filename.string(), NULL, is_linear);
			if(type == ImageManager::IMAGE_DATA_TYPE_FLOAT || type == ImageManager::IMAGE_DATA_TYPE_FLOAT4)
				is_float = 1;
		}
		else {
			bool is_float_bool;
			slot = image_manager->add_image(filename.string(),
			                                builtin_data,
			                                animated,
			                                0,
			                                is_float_bool,
			                                is_linear,
			                                interpolation,
			                                extension,
			                                use_alpha);
			is_float = (int)is_float_bool;
		}
	}

	if(slot == -1) {
		compiler.parameter(this, "filename");
	}
	else {
		/* TODO(sergey): It's not so simple to pass custom attribute
		 * to the texture() function in order to make builtin images
		 * support more clear. So we use special file name which is
		 * "@<slot_number>" and check whether file name matches this
		 * mask in the OSLRenderServices::texture().
		 */
		compiler.parameter("filename", string_printf("@%d", slot).c_str());
	}
	if(is_linear || color_space != NODE_COLOR_SPACE_COLOR)
		compiler.parameter("color_space", "linear");
	else
		compiler.parameter("color_space", "sRGB");
	compiler.parameter(this, "projection");
	compiler.parameter(this, "projection_blend");
	compiler.parameter("is_float", is_float);
	compiler.parameter("use_alpha", !alpha_out->links.empty());
	compiler.parameter(this, "interpolation");
	compiler.parameter(this, "extension");

	compiler.add(this, "node_image_texture");
}

/* Environment Texture */

NODE_DEFINE(EnvironmentTextureNode)
{
	NodeType* type = NodeType::add("environment_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(EnvironmentTextureNode);

	SOCKET_STRING(filename, "Filename", ustring(""));

	static NodeEnum color_space_enum;
	color_space_enum.insert("none", NODE_COLOR_SPACE_NONE);
	color_space_enum.insert("color", NODE_COLOR_SPACE_COLOR);
	SOCKET_ENUM(color_space, "Color Space", color_space_enum, NODE_COLOR_SPACE_COLOR);

	SOCKET_BOOLEAN(use_alpha, "Use Alpha", true);

	static NodeEnum interpolation_enum;
	interpolation_enum.insert("closest", INTERPOLATION_CLOSEST);
	interpolation_enum.insert("linear", INTERPOLATION_LINEAR);
	interpolation_enum.insert("cubic", INTERPOLATION_CUBIC);
	interpolation_enum.insert("smart", INTERPOLATION_SMART);
	SOCKET_ENUM(interpolation, "Interpolation", interpolation_enum, INTERPOLATION_LINEAR);

	static NodeEnum projection_enum;
	projection_enum.insert("equirectangular", NODE_ENVIRONMENT_EQUIRECTANGULAR);
	projection_enum.insert("mirror_ball", NODE_ENVIRONMENT_MIRROR_BALL);
	SOCKET_ENUM(projection, "Projection", projection_enum, NODE_ENVIRONMENT_EQUIRECTANGULAR);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_POSITION);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(alpha, "Alpha");

	return type;
}

EnvironmentTextureNode::EnvironmentTextureNode()
: ImageSlotTextureNode(node_type)
{
	image_manager = NULL;
	slot = -1;
	is_float = -1;
	is_linear = false;
	builtin_data = NULL;
	animated = false;
}

EnvironmentTextureNode::~EnvironmentTextureNode()
{
	if(image_manager) {
		image_manager->remove_image(filename.string(),
		                            builtin_data,
		                            interpolation,
		                            EXTENSION_REPEAT,
		                            use_alpha);
	}
}

ShaderNode *EnvironmentTextureNode::clone() const
{
	EnvironmentTextureNode *node = new EnvironmentTextureNode(*this);
	node->image_manager = NULL;
	node->slot = -1;
	node->is_float = -1;
	node->is_linear = false;
	return node;
}

void EnvironmentTextureNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
#ifdef WITH_PTEX
	if(shader->has_surface && string_endswith(filename, ".ptx")) {
		/* ptex */
		attributes->add(ATTR_STD_PTEX_FACE_ID);
		attributes->add(ATTR_STD_PTEX_UV);
	}
#endif

	ShaderNode::attributes(shader, attributes);
}

void EnvironmentTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *color_out = output("Color");
	ShaderOutput *alpha_out = output("Alpha");

	image_manager = compiler.image_manager;
	if(slot == -1) {
		bool is_float_bool;
		slot = image_manager->add_image(filename.string(),
		                                builtin_data,
		                                animated,
		                                0,
		                                is_float_bool,
		                                is_linear,
		                                interpolation,
		                                EXTENSION_REPEAT,
		                                use_alpha);
		is_float = (int)is_float_bool;
	}

	if(slot != -1) {
		int srgb = (is_linear || color_space != NODE_COLOR_SPACE_COLOR)? 0: 1;
		int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

		compiler.add_node(NODE_TEX_ENVIRONMENT,
			slot,
			compiler.encode_uchar4(
				vector_offset,
				compiler.stack_assign_if_linked(color_out),
				compiler.stack_assign_if_linked(alpha_out),
				srgb),
			projection);
	
		tex_mapping.compile_end(compiler, vector_in, vector_offset);
	}
	else {
		/* image not found */
		if(!color_out->links.empty()) {
			compiler.add_node(NODE_VALUE_V, compiler.stack_assign(color_out));
			compiler.add_node(NODE_VALUE_V, make_float3(TEX_IMAGE_MISSING_R,
			                                            TEX_IMAGE_MISSING_G,
			                                            TEX_IMAGE_MISSING_B));
		}
		if(!alpha_out->links.empty())
			compiler.add_node(NODE_VALUE_F, __float_as_int(TEX_IMAGE_MISSING_A), compiler.stack_assign(alpha_out));
	}
}

void EnvironmentTextureNode::compile(OSLCompiler& compiler)
{
	ShaderOutput *alpha_out = output("Alpha");

	tex_mapping.compile(compiler);

	/* See comments in ImageTextureNode::compile about support
	 * of builtin images.
	 */
	image_manager = compiler.image_manager;
	if(is_float == -1) {
		if(builtin_data == NULL) {
			ImageManager::ImageDataType type;
			type = image_manager->get_image_metadata(filename.string(), NULL, is_linear);
			if(type == ImageManager::IMAGE_DATA_TYPE_FLOAT || type == ImageManager::IMAGE_DATA_TYPE_FLOAT4)
				is_float = 1;
		}
		else {
			bool is_float_bool;
			slot = image_manager->add_image(filename.string(),
			                                builtin_data,
			                                animated,
			                                0,
			                                is_float_bool,
			                                is_linear,
			                                interpolation,
			                                EXTENSION_REPEAT,
			                                use_alpha);
			is_float = (int)is_float_bool;
		}
	}

	if(slot == -1) {
		compiler.parameter(this, "filename");
	}
	else {
		compiler.parameter("filename", string_printf("@%d", slot).c_str());
	}
	compiler.parameter(this, "projection");
	if(is_linear || color_space != NODE_COLOR_SPACE_COLOR)
		compiler.parameter("color_space", "linear");
	else
		compiler.parameter("color_space", "sRGB");

	compiler.parameter(this, "interpolation");
	compiler.parameter("is_float", is_float);
	compiler.parameter("use_alpha", !alpha_out->links.empty());
	compiler.add(this, "node_environment_texture");
}

/* Sky Texture */

static float2 sky_spherical_coordinates(float3 dir)
{
	return make_float2(acosf(dir.z), atan2f(dir.x, dir.y));
}

typedef struct SunSky {
	/* sun direction in spherical and cartesian */
	float theta, phi;

	/* Parameter */
	float radiance_x, radiance_y, radiance_z;
	float config_x[9], config_y[9], config_z[9];
} SunSky;

/* Preetham model */
static float sky_perez_function(float lam[6], float theta, float gamma)
{
	return (1.0f + lam[0]*expf(lam[1]/cosf(theta))) * (1.0f + lam[2]*expf(lam[3]*gamma)  + lam[4]*cosf(gamma)*cosf(gamma));
}

static void sky_texture_precompute_old(SunSky *sunsky, float3 dir, float turbidity)
{
	/*
	 * We re-use the SunSky struct of the new model, to avoid extra variables
	 * zenith_Y/x/y is now radiance_x/y/z
	 * perez_Y/x/y is now config_x/y/z
	 */
	
	float2 spherical = sky_spherical_coordinates(dir);
	float theta = spherical.x;
	float phi = spherical.y;

	sunsky->theta = theta;
	sunsky->phi = phi;

	float theta2 = theta*theta;
	float theta3 = theta2*theta;
	float T = turbidity;
	float T2 = T * T;

	float chi = (4.0f / 9.0f - T / 120.0f) * (M_PI_F - 2.0f * theta);
	sunsky->radiance_x = (4.0453f * T - 4.9710f) * tanf(chi) - 0.2155f * T + 2.4192f;
	sunsky->radiance_x *= 0.06f;

	sunsky->radiance_y =
	(0.00166f * theta3 - 0.00375f * theta2 + 0.00209f * theta) * T2 +
	(-0.02903f * theta3 + 0.06377f * theta2 - 0.03202f * theta + 0.00394f) * T +
	(0.11693f * theta3 - 0.21196f * theta2 + 0.06052f * theta + 0.25886f);

	sunsky->radiance_z =
	(0.00275f * theta3 - 0.00610f * theta2 + 0.00317f * theta) * T2 +
	(-0.04214f * theta3 + 0.08970f * theta2 - 0.04153f * theta  + 0.00516f) * T +
	(0.15346f * theta3 - 0.26756f * theta2 + 0.06670f * theta  + 0.26688f);

	sunsky->config_x[0] = (0.1787f * T  - 1.4630f);
	sunsky->config_x[1] = (-0.3554f * T  + 0.4275f);
	sunsky->config_x[2] = (-0.0227f * T  + 5.3251f);
	sunsky->config_x[3] = (0.1206f * T  - 2.5771f);
	sunsky->config_x[4] = (-0.0670f * T  + 0.3703f);

	sunsky->config_y[0] = (-0.0193f * T  - 0.2592f);
	sunsky->config_y[1] = (-0.0665f * T  + 0.0008f);
	sunsky->config_y[2] = (-0.0004f * T  + 0.2125f);
	sunsky->config_y[3] = (-0.0641f * T  - 0.8989f);
	sunsky->config_y[4] = (-0.0033f * T  + 0.0452f);

	sunsky->config_z[0] = (-0.0167f * T  - 0.2608f);
	sunsky->config_z[1] = (-0.0950f * T  + 0.0092f);
	sunsky->config_z[2] = (-0.0079f * T  + 0.2102f);
	sunsky->config_z[3] = (-0.0441f * T  - 1.6537f);
	sunsky->config_z[4] = (-0.0109f * T  + 0.0529f);

	/* unused for old sky model */
	for(int i = 5; i < 9; i++) {
		sunsky->config_x[i] = 0.0f;
		sunsky->config_y[i] = 0.0f;
		sunsky->config_z[i] = 0.0f;
	}

	sunsky->radiance_x /= sky_perez_function(sunsky->config_x, 0, theta);
	sunsky->radiance_y /= sky_perez_function(sunsky->config_y, 0, theta);
	sunsky->radiance_z /= sky_perez_function(sunsky->config_z, 0, theta);
}

/* Hosek / Wilkie */
static void sky_texture_precompute_new(SunSky *sunsky, float3 dir, float turbidity, float ground_albedo)
{
	/* Calculate Sun Direction and save coordinates */
	float2 spherical = sky_spherical_coordinates(dir);
	float theta = spherical.x;
	float phi = spherical.y;
	
	/* Clamp Turbidity */
	turbidity = clamp(turbidity, 0.0f, 10.0f); 
	
	/* Clamp to Horizon */
	theta = clamp(theta, 0.0f, M_PI_2_F); 

	sunsky->theta = theta;
	sunsky->phi = phi;

	float solarElevation = M_PI_2_F - theta;

	/* Initialize Sky Model */
	ArHosekSkyModelState *sky_state;
	sky_state = arhosek_xyz_skymodelstate_alloc_init((double)turbidity, (double)ground_albedo, (double)solarElevation);

	/* Copy values from sky_state to SunSky */
	for(int i = 0; i < 9; ++i) {
		sunsky->config_x[i] = (float)sky_state->configs[0][i];
		sunsky->config_y[i] = (float)sky_state->configs[1][i];
		sunsky->config_z[i] = (float)sky_state->configs[2][i];
	}
	sunsky->radiance_x = (float)sky_state->radiances[0];
	sunsky->radiance_y = (float)sky_state->radiances[1];
	sunsky->radiance_z = (float)sky_state->radiances[2];

	/* Free sky_state */
	arhosekskymodelstate_free(sky_state);
}

NODE_DEFINE(SkyTextureNode)
{
	NodeType* type = NodeType::add("sky_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(SkyTextureNode);

	static NodeEnum type_enum;
	type_enum.insert("preetham", NODE_SKY_OLD);
	type_enum.insert("hosek_wilkie", NODE_SKY_NEW);
	SOCKET_ENUM(type, "Type", type_enum, NODE_SKY_NEW);

	SOCKET_VECTOR(sun_direction, "Sun Direction", make_float3(0.0f, 0.0f, 1.0f));
	SOCKET_FLOAT(turbidity, "Turbidity", 2.2f);
	SOCKET_FLOAT(ground_albedo, "Ground Albedo", 0.3f);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);

	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

SkyTextureNode::SkyTextureNode()
: TextureNode(node_type)
{
}

void SkyTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *color_out = output("Color");

	SunSky sunsky;
	if(type == NODE_SKY_OLD)
		sky_texture_precompute_old(&sunsky, sun_direction, turbidity);
	else if(type == NODE_SKY_NEW)
		sky_texture_precompute_new(&sunsky, sun_direction, turbidity, ground_albedo);
	else
		assert(false);

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.stack_assign(color_out);
	compiler.add_node(NODE_TEX_SKY, vector_offset, compiler.stack_assign(color_out), type);
	compiler.add_node(__float_as_uint(sunsky.phi), __float_as_uint(sunsky.theta), __float_as_uint(sunsky.radiance_x), __float_as_uint(sunsky.radiance_y));
	compiler.add_node(__float_as_uint(sunsky.radiance_z), __float_as_uint(sunsky.config_x[0]), __float_as_uint(sunsky.config_x[1]), __float_as_uint(sunsky.config_x[2]));
	compiler.add_node(__float_as_uint(sunsky.config_x[3]), __float_as_uint(sunsky.config_x[4]), __float_as_uint(sunsky.config_x[5]), __float_as_uint(sunsky.config_x[6]));
	compiler.add_node(__float_as_uint(sunsky.config_x[7]), __float_as_uint(sunsky.config_x[8]), __float_as_uint(sunsky.config_y[0]), __float_as_uint(sunsky.config_y[1]));
	compiler.add_node(__float_as_uint(sunsky.config_y[2]), __float_as_uint(sunsky.config_y[3]), __float_as_uint(sunsky.config_y[4]), __float_as_uint(sunsky.config_y[5]));
	compiler.add_node(__float_as_uint(sunsky.config_y[6]), __float_as_uint(sunsky.config_y[7]), __float_as_uint(sunsky.config_y[8]), __float_as_uint(sunsky.config_z[0]));
	compiler.add_node(__float_as_uint(sunsky.config_z[1]), __float_as_uint(sunsky.config_z[2]), __float_as_uint(sunsky.config_z[3]), __float_as_uint(sunsky.config_z[4]));
	compiler.add_node(__float_as_uint(sunsky.config_z[5]), __float_as_uint(sunsky.config_z[6]), __float_as_uint(sunsky.config_z[7]), __float_as_uint(sunsky.config_z[8]));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void SkyTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	SunSky sunsky;
	if(type == NODE_SKY_OLD)
		sky_texture_precompute_old(&sunsky, sun_direction, turbidity);
	else if(type == NODE_SKY_NEW)
		sky_texture_precompute_new(&sunsky, sun_direction, turbidity, ground_albedo);
	else
		assert(false);
		
	compiler.parameter(this, "type");
	compiler.parameter("theta", sunsky.theta);
	compiler.parameter("phi", sunsky.phi);
	compiler.parameter_color("radiance", make_float3(sunsky.radiance_x, sunsky.radiance_y, sunsky.radiance_z));
	compiler.parameter_array("config_x", sunsky.config_x, 9);
	compiler.parameter_array("config_y", sunsky.config_y, 9);
	compiler.parameter_array("config_z", sunsky.config_z, 9);
	compiler.add(this, "node_sky_texture");
}

/* Gradient Texture */

NODE_DEFINE(GradientTextureNode)
{
	NodeType* type = NodeType::add("gradient_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(GradientTextureNode);

	static NodeEnum type_enum;
	type_enum.insert("linear", NODE_BLEND_LINEAR);
	type_enum.insert("quadratic", NODE_BLEND_QUADRATIC);
	type_enum.insert("easing", NODE_BLEND_EASING);
	type_enum.insert("diagonal", NODE_BLEND_DIAGONAL);
	type_enum.insert("radial", NODE_BLEND_RADIAL);
	type_enum.insert("quadratic_sphere", NODE_BLEND_QUADRATIC_SPHERE);
	type_enum.insert("spherical", NODE_BLEND_SPHERICAL);
	SOCKET_ENUM(type, "Type", type_enum, NODE_BLEND_LINEAR);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

GradientTextureNode::GradientTextureNode()
: TextureNode(node_type)
{
}

void GradientTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *color_out = output("Color");
	ShaderOutput *fac_out = output("Fac");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_GRADIENT,
		compiler.encode_uchar4(
			type,
			vector_offset,
			compiler.stack_assign_if_linked(fac_out),
			compiler.stack_assign_if_linked(color_out)));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void GradientTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.parameter(this, "type");
	compiler.add(this, "node_gradient_texture");
}

/* Noise Texture */

NODE_DEFINE(NoiseTextureNode)
{
	NodeType* type = NodeType::add("noise_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(NoiseTextureNode);

	SOCKET_IN_FLOAT(scale, "Scale", 1.0f);
	SOCKET_IN_FLOAT(detail, "Detail", 2.0f);
	SOCKET_IN_FLOAT(distortion, "Distortion", 0.0f);
	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

NoiseTextureNode::NoiseTextureNode()
: TextureNode(node_type)
{
}

void NoiseTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *distortion_in = input("Distortion");
	ShaderInput *detail_in = input("Detail");
	ShaderInput *scale_in = input("Scale");
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *color_out = output("Color");
	ShaderOutput *fac_out = output("Fac");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_NOISE,
		compiler.encode_uchar4(
			vector_offset,
			compiler.stack_assign_if_linked(scale_in),
			compiler.stack_assign_if_linked(detail_in),
			compiler.stack_assign_if_linked(distortion_in)),
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(color_out),
			compiler.stack_assign_if_linked(fac_out)));
	compiler.add_node(
		__float_as_int(scale),
		__float_as_int(detail),
		__float_as_int(distortion));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void NoiseTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.add(this, "node_noise_texture");
}

/* Voronoi Texture */

NODE_DEFINE(VoronoiTextureNode)
{
	NodeType* type = NodeType::add("voronoi_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(VoronoiTextureNode);

	static NodeEnum coloring_enum;
	coloring_enum.insert("intensity", NODE_VORONOI_INTENSITY);
	coloring_enum.insert("cells", NODE_VORONOI_CELLS);
	SOCKET_ENUM(coloring, "Coloring", coloring_enum, NODE_VORONOI_INTENSITY);

	SOCKET_IN_FLOAT(scale, "Scale", 1.0f);
	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

VoronoiTextureNode::VoronoiTextureNode()
: TextureNode(node_type)
{
}

void VoronoiTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *scale_in = input("Scale");
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *color_out = output("Color");
	ShaderOutput *fac_out = output("Fac");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_VORONOI,
		coloring,
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(scale_in),
			vector_offset,
			compiler.stack_assign(fac_out),
			compiler.stack_assign(color_out)),
		__float_as_int(scale));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void VoronoiTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.parameter(this, "coloring");
	compiler.add(this, "node_voronoi_texture");
}

/* Musgrave Texture */

NODE_DEFINE(MusgraveTextureNode)
{
	NodeType* type = NodeType::add("musgrave_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(MusgraveTextureNode);

	static NodeEnum type_enum;
	type_enum.insert("multifractal", NODE_MUSGRAVE_MULTIFRACTAL);
	type_enum.insert("fBM", NODE_MUSGRAVE_FBM);
	type_enum.insert("hybrid_multifractal", NODE_MUSGRAVE_HYBRID_MULTIFRACTAL);
	type_enum.insert("ridged_multifractal", NODE_MUSGRAVE_RIDGED_MULTIFRACTAL);
	type_enum.insert("hetero_terrain", NODE_MUSGRAVE_HETERO_TERRAIN);
	SOCKET_ENUM(type, "Type", type_enum, NODE_MUSGRAVE_FBM);

	SOCKET_IN_FLOAT(scale, "Scale", 1.0f);
	SOCKET_IN_FLOAT(detail, "Detail", 2.0f);
	SOCKET_IN_FLOAT(dimension, "Dimension", 2.0f);
	SOCKET_IN_FLOAT(lacunarity, "Lacunarity", 1.0f);
	SOCKET_IN_FLOAT(offset, "Offset", 0.0f);
	SOCKET_IN_FLOAT(gain, "Gain", 1.0f);
	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

MusgraveTextureNode::MusgraveTextureNode()
: TextureNode(node_type)
{
}

void MusgraveTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderInput *scale_in = input("Scale");
	ShaderInput *dimension_in = input("Dimension");
	ShaderInput *lacunarity_in = input("Lacunarity");
	ShaderInput *detail_in = input("Detail");
	ShaderInput *offset_in = input("Offset");
	ShaderInput *gain_in = input("Gain");
	ShaderOutput *fac_out = output("Fac");
	ShaderOutput *color_out = output("Color");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_MUSGRAVE,
		compiler.encode_uchar4(
			type,
			vector_offset,
			compiler.stack_assign_if_linked(color_out),
			compiler.stack_assign_if_linked(fac_out)),
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(dimension_in),
			compiler.stack_assign_if_linked(lacunarity_in),
			compiler.stack_assign_if_linked(detail_in),
			compiler.stack_assign_if_linked(offset_in)),
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(gain_in),
			compiler.stack_assign_if_linked(scale_in)));
	compiler.add_node(__float_as_int(dimension),
		__float_as_int(lacunarity),
		__float_as_int(detail),
		__float_as_int(offset));
	compiler.add_node(__float_as_int(gain),
		__float_as_int(scale));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void MusgraveTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.parameter(this, "type");
	compiler.add(this, "node_musgrave_texture");
}

/* Wave Texture */

NODE_DEFINE(WaveTextureNode)
{
	NodeType* type = NodeType::add("wave_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(WaveTextureNode);

	static NodeEnum type_enum;
	type_enum.insert("bands", NODE_WAVE_BANDS);
	type_enum.insert("rings", NODE_WAVE_RINGS);
	SOCKET_ENUM(type, "Type", type_enum, NODE_WAVE_BANDS);

	static NodeEnum profile_enum;
	profile_enum.insert("sine", NODE_WAVE_PROFILE_SIN);
	profile_enum.insert("saw", NODE_WAVE_PROFILE_SAW);
	SOCKET_ENUM(profile, "Profile", profile_enum, NODE_WAVE_PROFILE_SIN);

	SOCKET_IN_FLOAT(scale, "Scale", 1.0f);
	SOCKET_IN_FLOAT(distortion, "Distortion", 0.0f);
	SOCKET_IN_FLOAT(detail, "Detail", 2.0f);
	SOCKET_IN_FLOAT(detail_scale, "Detail Scale", 0.0f);
	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

WaveTextureNode::WaveTextureNode()
: TextureNode(node_type)
{
}

void WaveTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *scale_in = input("Scale");
	ShaderInput *distortion_in = input("Distortion");
	ShaderInput *dscale_in = input("Detail Scale");
	ShaderInput *detail_in = input("Detail");
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *fac_out = output("Fac");
	ShaderOutput *color_out = output("Color");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_WAVE,
		compiler.encode_uchar4(
			type,
			compiler.stack_assign_if_linked(color_out),
			compiler.stack_assign_if_linked(fac_out),
			compiler.stack_assign_if_linked(dscale_in)),
		compiler.encode_uchar4(
			vector_offset,
			compiler.stack_assign_if_linked(scale_in),
			compiler.stack_assign_if_linked(detail_in),
			compiler.stack_assign_if_linked(distortion_in)),
		profile);

	compiler.add_node(
		__float_as_int(scale),
		__float_as_int(detail),
		__float_as_int(distortion),
		__float_as_int(detail_scale));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void WaveTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.parameter(this, "type");
	compiler.parameter(this, "profile");

	compiler.add(this, "node_wave_texture");
}

/* Magic Texture */

NODE_DEFINE(MagicTextureNode)
{
	NodeType* type = NodeType::add("magic_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(MagicTextureNode);

	SOCKET_INT(depth, "Depth", 2);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);
	SOCKET_IN_FLOAT(scale, "Scale", 5.0f);
	SOCKET_IN_FLOAT(distortion, "Distortion", 1.0f);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

MagicTextureNode::MagicTextureNode()
: TextureNode(node_type)
{
}

void MagicTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderInput *scale_in = input("Scale");
	ShaderInput *distortion_in = input("Distortion");
	ShaderOutput *color_out = output("Color");
	ShaderOutput *fac_out = output("Fac");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_MAGIC,
		compiler.encode_uchar4(
			depth,
			compiler.stack_assign_if_linked(color_out),
			compiler.stack_assign_if_linked(fac_out)),
		compiler.encode_uchar4(
			vector_offset,
			compiler.stack_assign_if_linked(scale_in),
			compiler.stack_assign_if_linked(distortion_in)));
	compiler.add_node(
		__float_as_int(scale),
		__float_as_int(distortion));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void MagicTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.parameter(this, "depth");
	compiler.add(this, "node_magic_texture");
}

/* Checker Texture */

NODE_DEFINE(CheckerTextureNode)
{
	NodeType* type = NodeType::add("checker_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(CheckerTextureNode);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);
	SOCKET_IN_COLOR(color1, "Color1", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_COLOR(color2, "Color2", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_FLOAT(scale, "Scale", 1.0f);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

CheckerTextureNode::CheckerTextureNode()
: TextureNode(node_type)
{
}

void CheckerTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderInput *color1_in = input("Color1");
	ShaderInput *color2_in = input("Color2");
	ShaderInput *scale_in = input("Scale");
	
	ShaderOutput *color_out = output("Color");
	ShaderOutput *fac_out = output("Fac");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_CHECKER,
		compiler.encode_uchar4(
			vector_offset,
			compiler.stack_assign(color1_in),
			compiler.stack_assign(color2_in),
			compiler.stack_assign_if_linked(scale_in)),
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(color_out),
			compiler.stack_assign_if_linked(fac_out)),
		__float_as_int(scale));

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void CheckerTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.add(this, "node_checker_texture");
}

/* Brick Texture */

NODE_DEFINE(BrickTextureNode)
{
	NodeType* type = NodeType::add("brick_texture", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(BrickTextureNode);

	SOCKET_FLOAT(offset, "Offset", 0.5f);
	SOCKET_INT(offset_frequency, "Offset Frequency", 2);
	SOCKET_FLOAT(squash, "Squash", 1.0f);
	SOCKET_INT(squash_frequency, "Squash Frequency", 2);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TEXTURE_GENERATED);

	SOCKET_IN_COLOR(color1, "Color1", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_COLOR(color2, "Color2", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_COLOR(mortar, "Mortar", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_FLOAT(scale, "Scale", 5.0f);
	SOCKET_IN_FLOAT(mortar_size, "Mortar Size", 0.02f);
	SOCKET_IN_FLOAT(mortar_smooth, "Mortar Smooth", 0.0f);
	SOCKET_IN_FLOAT(bias, "Bias", 0.0f);
	SOCKET_IN_FLOAT(brick_width, "Brick Width", 0.5f);
	SOCKET_IN_FLOAT(row_height, "Row Height", 0.25f);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

BrickTextureNode::BrickTextureNode()
: TextureNode(node_type)
{
}

void BrickTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderInput *color1_in = input("Color1");
	ShaderInput *color2_in = input("Color2");
	ShaderInput *mortar_in = input("Mortar");
	ShaderInput *scale_in = input("Scale");
	ShaderInput *mortar_size_in = input("Mortar Size");
	ShaderInput *mortar_smooth_in = input("Mortar Smooth");
	ShaderInput *bias_in = input("Bias");
	ShaderInput *brick_width_in = input("Brick Width");
	ShaderInput *row_height_in = input("Row Height");
	
	ShaderOutput *color_out = output("Color");
	ShaderOutput *fac_out = output("Fac");

	int vector_offset = tex_mapping.compile_begin(compiler, vector_in);

	compiler.add_node(NODE_TEX_BRICK,
		compiler.encode_uchar4(
			vector_offset,
			compiler.stack_assign(color1_in),
			compiler.stack_assign(color2_in),
			compiler.stack_assign(mortar_in)),
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(scale_in),
			compiler.stack_assign_if_linked(mortar_size_in),
			compiler.stack_assign_if_linked(bias_in),
			compiler.stack_assign_if_linked(brick_width_in)),
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(row_height_in),
			compiler.stack_assign_if_linked(color_out),
			compiler.stack_assign_if_linked(fac_out),
			compiler.stack_assign_if_linked(mortar_smooth_in)));
			
	compiler.add_node(compiler.encode_uchar4(offset_frequency, squash_frequency),
		__float_as_int(scale),
		__float_as_int(mortar_size),
		__float_as_int(bias));

	compiler.add_node(__float_as_int(brick_width),
		__float_as_int(row_height),
		__float_as_int(offset),
		__float_as_int(squash));

	compiler.add_node(__float_as_int(mortar_smooth),
		SVM_STACK_INVALID,
		SVM_STACK_INVALID,
		SVM_STACK_INVALID);

	tex_mapping.compile_end(compiler, vector_in, vector_offset);
}

void BrickTextureNode::compile(OSLCompiler& compiler)
{
	tex_mapping.compile(compiler);

	compiler.parameter(this, "offset");
	compiler.parameter(this, "offset_frequency");
	compiler.parameter(this, "squash");
	compiler.parameter(this, "squash_frequency");
	compiler.add(this, "node_brick_texture");
}

/* Point Density Texture */

NODE_DEFINE(PointDensityTextureNode)
{
	NodeType* type = NodeType::add("point_density_texture", create, NodeType::SHADER);

	SOCKET_STRING(filename, "Filename", ustring(""));

	static NodeEnum space_enum;
	space_enum.insert("object", NODE_TEX_VOXEL_SPACE_OBJECT);
	space_enum.insert("world", NODE_TEX_VOXEL_SPACE_WORLD);
	SOCKET_ENUM(space, "Space", space_enum, NODE_TEX_VOXEL_SPACE_OBJECT);

	static NodeEnum interpolation_enum;
	interpolation_enum.insert("closest", INTERPOLATION_CLOSEST);
	interpolation_enum.insert("linear", INTERPOLATION_LINEAR);
	interpolation_enum.insert("cubic", INTERPOLATION_CUBIC);
	interpolation_enum.insert("smart", INTERPOLATION_SMART);
	SOCKET_ENUM(interpolation, "Interpolation", interpolation_enum, INTERPOLATION_LINEAR);

	SOCKET_TRANSFORM(tfm, "Transform", transform_identity());

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_POSITION);

	SOCKET_OUT_FLOAT(density, "Density");
	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

PointDensityTextureNode::PointDensityTextureNode()
: ShaderNode(node_type)
{
	image_manager = NULL;
	slot = -1;
	builtin_data = NULL;
}

PointDensityTextureNode::~PointDensityTextureNode()
{
	if(image_manager) {
		image_manager->remove_image(filename.string(),
		                            builtin_data,
		                            interpolation,
		                            EXTENSION_CLIP,
		                            true);
	}
}

ShaderNode *PointDensityTextureNode::clone() const
{
	PointDensityTextureNode *node = new PointDensityTextureNode(*this);
	node->image_manager = NULL;
	node->slot = -1;
	return node;
}

void PointDensityTextureNode::attributes(Shader *shader,
                                         AttributeRequestSet *attributes)
{
	if(shader->has_volume)
		attributes->add(ATTR_STD_GENERATED_TRANSFORM);

	ShaderNode::attributes(shader, attributes);
}

void PointDensityTextureNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *density_out = output("Density");
	ShaderOutput *color_out = output("Color");

	const bool use_density = !density_out->links.empty();
	const bool use_color = !color_out->links.empty();

	image_manager = compiler.image_manager;

	if(use_density || use_color) {
		if(slot == -1) {
			bool is_float, is_linear;
			slot = image_manager->add_image(filename.string(), builtin_data,
			                                false, 0,
			                                is_float, is_linear,
			                                interpolation,
			                                EXTENSION_CLIP,
			                                true);
		}

		if(slot != -1) {
			compiler.stack_assign(vector_in);
			compiler.add_node(NODE_TEX_VOXEL,
			                  slot,
			                  compiler.encode_uchar4(compiler.stack_assign(vector_in),
			                                         compiler.stack_assign_if_linked(density_out),
			                                         compiler.stack_assign_if_linked(color_out),
			                                         space));
			if(space == NODE_TEX_VOXEL_SPACE_WORLD) {
				compiler.add_node(tfm.x);
				compiler.add_node(tfm.y);
				compiler.add_node(tfm.z);
				compiler.add_node(tfm.w);
			}
		}
		else {
			if(use_density) {
				compiler.add_node(NODE_VALUE_F,
				                  __float_as_int(0.0f),
				                  compiler.stack_assign(density_out));
			}
			if(use_color) {
				compiler.add_node(NODE_VALUE_V, compiler.stack_assign(color_out));
				compiler.add_node(NODE_VALUE_V, make_float3(TEX_IMAGE_MISSING_R,
				                                            TEX_IMAGE_MISSING_G,
				                                            TEX_IMAGE_MISSING_B));
			}
		}
	}
}

void PointDensityTextureNode::compile(OSLCompiler& compiler)
{
	ShaderOutput *density_out = output("Density");
	ShaderOutput *color_out = output("Color");

	const bool use_density = !density_out->links.empty();
	const bool use_color = !color_out->links.empty();

	image_manager = compiler.image_manager;

	if(use_density || use_color) {
		if(slot == -1) {
			bool is_float, is_linear;
			slot = image_manager->add_image(filename.string(), builtin_data,
			                                false, 0,
			                                is_float, is_linear,
			                                interpolation,
			                                EXTENSION_CLIP,
			                                true);
		}

		if(slot != -1) {
			compiler.parameter("filename", string_printf("@%d", slot).c_str());
		}
		if(space == NODE_TEX_VOXEL_SPACE_WORLD) {
			compiler.parameter("mapping", transform_transpose(tfm));
			compiler.parameter("use_mapping", 1);
		}
		compiler.parameter(this, "interpolation");
		compiler.add(this, "node_voxel_texture");
	}
}

/* Normal */

NODE_DEFINE(NormalNode)
{
	NodeType* type = NodeType::add("normal", create, NodeType::SHADER);

	SOCKET_VECTOR(direction, "direction", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_NORMAL(normal, "Normal");
	SOCKET_OUT_FLOAT(dot, "Dot");

	return type;
}

NormalNode::NormalNode()
: ShaderNode(node_type)
{
}

void NormalNode::compile(SVMCompiler& compiler)
{
	ShaderInput *normal_in = input("Normal");
	ShaderOutput *normal_out = output("Normal");
	ShaderOutput *dot_out = output("Dot");

	compiler.add_node(NODE_NORMAL,
		compiler.stack_assign(normal_in),
		compiler.stack_assign(normal_out),
		compiler.stack_assign(dot_out));
	compiler.add_node(
		__float_as_int(direction.x),
		__float_as_int(direction.y),
		__float_as_int(direction.z));
}

void NormalNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "direction");
	compiler.add(this, "node_normal");
}

/* Mapping */

NODE_DEFINE(MappingNode)
{
	NodeType* type = NodeType::add("mapping", create, NodeType::SHADER);

	TEXTURE_MAPPING_DEFINE(MappingNode);

	SOCKET_IN_POINT(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_OUT_POINT(vector, "Vector");

	return type;
}

MappingNode::MappingNode()
: ShaderNode(node_type)
{
}

void MappingNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *vector_out = output("Vector");

	tex_mapping.compile(compiler, compiler.stack_assign(vector_in), compiler.stack_assign(vector_out));
}

void MappingNode::compile(OSLCompiler& compiler)
{
	Transform tfm = transform_transpose(tex_mapping.compute_transform());
	compiler.parameter("Matrix", tfm);
	compiler.parameter_point("mapping_min", tex_mapping.min);
	compiler.parameter_point("mapping_max", tex_mapping.max);
	compiler.parameter("use_minmax", tex_mapping.use_minmax);

	compiler.add(this, "node_mapping");
}

/* RGBToBW */

NODE_DEFINE(RGBToBWNode)
{
	NodeType* type = NodeType::add("rgb_to_bw", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_OUT_FLOAT(val, "Val");

	return type;
}

RGBToBWNode::RGBToBWNode()
: ShaderNode(node_type)
{
}

void RGBToBWNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant(linear_rgb_to_gray(color));
	}
}

void RGBToBWNode::compile(SVMCompiler& compiler)
{
	compiler.add_node(NODE_CONVERT,
	                 NODE_CONVERT_CF,
	                 compiler.stack_assign(inputs[0]),
	                 compiler.stack_assign(outputs[0]));
}

void RGBToBWNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_rgb_to_bw");
}

/* Convert */

const NodeType* ConvertNode::node_types[ConvertNode::MAX_TYPE][ConvertNode::MAX_TYPE];
bool ConvertNode::initialized = ConvertNode::register_types();

Node* ConvertNode::create(const NodeType *type)
{
	return new ConvertNode(type->inputs[0].type,  type->outputs[0].type);
}

bool ConvertNode::register_types()
{
	const int num_types = 8;
	SocketType::Type types[num_types] = {SocketType::FLOAT,
	                                     SocketType::INT,
	                                     SocketType::COLOR,
	                                     SocketType::VECTOR,
	                                     SocketType::POINT,
	                                     SocketType::NORMAL,
	                                     SocketType::STRING,
										 SocketType::CLOSURE};

	for(size_t i = 0; i < num_types; i++) {
		SocketType::Type from = types[i];
		ustring from_name(SocketType::type_name(from));
		ustring from_value_name("value_" + from_name.string());

		for(size_t j = 0; j < num_types; j++) {
			SocketType::Type to = types[j];
			ustring to_name(SocketType::type_name(to));
			ustring to_value_name("value_" + to_name.string());

			string node_name = "convert_" + from_name.string() + "_to_" + to_name.string();
			NodeType* type = NodeType::add(node_name.c_str(), create, NodeType::SHADER);

			type->register_input(from_value_name, from_value_name, from,
				SOCKET_OFFSETOF(ConvertNode, value_float), SocketType::zero_default_value(),
				NULL, NULL, SocketType::LINKABLE);
			type->register_output(to_value_name, to_value_name, to);

			assert(from < MAX_TYPE);
			assert(to < MAX_TYPE);

			node_types[from][to] = type;
		}
	}

	return true;
}

ConvertNode::ConvertNode(SocketType::Type from_, SocketType::Type to_, bool autoconvert)
: ShaderNode(node_types[from_][to_])
{
	from = from_;
	to = to_;

	if(from == to)
		special_type = SHADER_SPECIAL_TYPE_PROXY;
	else if(autoconvert)
		special_type = SHADER_SPECIAL_TYPE_AUTOCONVERT;
}

void ConvertNode::constant_fold(const ConstantFolder& folder)
{
	/* proxy nodes should have been removed at this point */
	assert(special_type != SHADER_SPECIAL_TYPE_PROXY);

	/* TODO(DingTo): conversion from/to int is not supported yet, don't fold in that case */

	if(folder.all_inputs_constant()) {
		if(from == SocketType::FLOAT) {
			if(SocketType::is_float3(to)) {
				folder.make_constant(make_float3(value_float, value_float, value_float));
			}
		}
		else if(SocketType::is_float3(from)) {
			if(to == SocketType::FLOAT) {
				if(from == SocketType::COLOR) {
					/* color to float */
					folder.make_constant(linear_rgb_to_gray(value_color));
				}
				else {
					/* vector/point/normal to float */
					folder.make_constant(average(value_vector));
				}
			}
			else if(SocketType::is_float3(to)) {
				folder.make_constant(value_color);
			}
		}
	}
	else {
		ShaderInput *in = inputs[0];
		ShaderNode *prev = in->link->parent;

		/* no-op conversion of A to B to A */
		if(prev->type == node_types[to][from]) {
			ShaderInput *prev_in = prev->inputs[0];

			if(SocketType::is_float3(from) && (to == SocketType::FLOAT || SocketType::is_float3(to)) && prev_in->link) {
				folder.bypass(prev_in->link);
			}
		}
	}
}

void ConvertNode::compile(SVMCompiler& compiler)
{
	/* proxy nodes should have been removed at this point */
	assert(special_type != SHADER_SPECIAL_TYPE_PROXY);

	ShaderInput *in = inputs[0];
	ShaderOutput *out = outputs[0];

	if(from == SocketType::FLOAT) {
		if(to == SocketType::INT)
			/* float to int */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_FI, compiler.stack_assign(in), compiler.stack_assign(out));
		else
			/* float to float3 */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_FV, compiler.stack_assign(in), compiler.stack_assign(out));
	}
	else if(from == SocketType::INT) {
		if(to == SocketType::FLOAT)
			/* int to float */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_IF, compiler.stack_assign(in), compiler.stack_assign(out));
		else
			/* int to vector/point/normal */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_IV, compiler.stack_assign(in), compiler.stack_assign(out));
	}
	else if(to == SocketType::FLOAT) {
		if(from == SocketType::COLOR)
			/* color to float */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_CF, compiler.stack_assign(in), compiler.stack_assign(out));
		else
			/* vector/point/normal to float */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_VF, compiler.stack_assign(in), compiler.stack_assign(out));
	}
	else if(to == SocketType::INT) {
		if(from == SocketType::COLOR)
			/* color to int */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_CI, compiler.stack_assign(in), compiler.stack_assign(out));
		else
			/* vector/point/normal to int */
			compiler.add_node(NODE_CONVERT, NODE_CONVERT_VI, compiler.stack_assign(in), compiler.stack_assign(out));
	}
	else {
		/* float3 to float3 */
		if(in->link) {
			/* no op in SVM */
			compiler.stack_link(in, out);
		}
		else {
			/* set 0,0,0 value */
			compiler.add_node(NODE_VALUE_V, compiler.stack_assign(out));
			compiler.add_node(NODE_VALUE_V, value_color);
		}
	}
}

void ConvertNode::compile(OSLCompiler& compiler)
{
	/* proxy nodes should have been removed at this point */
	assert(special_type != SHADER_SPECIAL_TYPE_PROXY);

	if(from == SocketType::FLOAT)
		compiler.add(this, "node_convert_from_float");
	else if(from == SocketType::INT)
		compiler.add(this, "node_convert_from_int");
	else if(from == SocketType::COLOR)
		compiler.add(this, "node_convert_from_color");
	else if(from == SocketType::VECTOR)
		compiler.add(this, "node_convert_from_vector");
	else if(from == SocketType::POINT)
		compiler.add(this, "node_convert_from_point");
	else if(from == SocketType::NORMAL)
		compiler.add(this, "node_convert_from_normal");
	else
		assert(0);
}

/* BSDF Closure */

BsdfNode::BsdfNode(const NodeType *node_type)
: ShaderNode(node_type)
{
	special_type = SHADER_SPECIAL_TYPE_CLOSURE;
}

void BsdfNode::compile(SVMCompiler& compiler, ShaderInput *param1, ShaderInput *param2, ShaderInput *param3, ShaderInput *param4)
{
	ShaderInput *color_in = input("Color");
	ShaderInput *normal_in = input("Normal");
	ShaderInput *tangent_in = input("Tangent");

	if(color_in->link)
		compiler.add_node(NODE_CLOSURE_WEIGHT, compiler.stack_assign(color_in));
	else
		compiler.add_node(NODE_CLOSURE_SET_WEIGHT, color);

	int normal_offset = (normal_in) ? compiler.stack_assign_if_linked(normal_in) : SVM_STACK_INVALID;
	int tangent_offset = (tangent_in) ? compiler.stack_assign_if_linked(tangent_in) : SVM_STACK_INVALID;
	int param3_offset = (param3) ? compiler.stack_assign(param3) : SVM_STACK_INVALID;
	int param4_offset = (param4) ? compiler.stack_assign(param4) : SVM_STACK_INVALID;

	compiler.add_node(NODE_CLOSURE_BSDF,
		compiler.encode_uchar4(closure,
			(param1)? compiler.stack_assign(param1): SVM_STACK_INVALID,
			(param2)? compiler.stack_assign(param2): SVM_STACK_INVALID,
			compiler.closure_mix_weight_offset()),
		__float_as_int((param1)? get_float(param1->socket_type): 0.0f),
		__float_as_int((param2)? get_float(param2->socket_type): 0.0f));

	compiler.add_node(normal_offset, tangent_offset, param3_offset, param4_offset);
}

void BsdfNode::compile(SVMCompiler& compiler)
{
	compile(compiler, NULL, NULL);
}

void BsdfNode::compile(OSLCompiler& /*compiler*/)
{
	assert(0);
}

/* Anisotropic BSDF Closure */

NODE_DEFINE(AnisotropicBsdfNode)
{
	NodeType* type = NodeType::add("anisotropic_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	static NodeEnum distribution_enum;
	distribution_enum.insert("beckmann", CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID);
	distribution_enum.insert("GGX", CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID);
	distribution_enum.insert("Multiscatter GGX", CLOSURE_BSDF_MICROFACET_MULTI_GGX_ANISO_ID);
	distribution_enum.insert("ashikhmin_shirley", CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID);
	SOCKET_ENUM(distribution, "Distribution", distribution_enum, CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID);

	SOCKET_IN_VECTOR(tangent, "Tangent", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_TANGENT);

	SOCKET_IN_FLOAT(roughness, "Roughness", 0.2f);
	SOCKET_IN_FLOAT(anisotropy, "Anisotropy", 0.5f);
	SOCKET_IN_FLOAT(rotation, "Rotation", 0.0f);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

AnisotropicBsdfNode::AnisotropicBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID;
}

void AnisotropicBsdfNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(shader->has_surface) {
		ShaderInput *tangent_in = input("Tangent");

		if(!tangent_in->link)
			attributes->add(ATTR_STD_GENERATED);
	}

	ShaderNode::attributes(shader, attributes);
}

void AnisotropicBsdfNode::compile(SVMCompiler& compiler)
{
	closure = distribution;

	if(closure == CLOSURE_BSDF_MICROFACET_MULTI_GGX_ANISO_ID)
		BsdfNode::compile(compiler, input("Roughness"), input("Anisotropy"), input("Rotation"), input("Color"));
	else
		BsdfNode::compile(compiler, input("Roughness"), input("Anisotropy"), input("Rotation"));
}

void AnisotropicBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "distribution");
	compiler.add(this, "node_anisotropic_bsdf");
}

/* Glossy BSDF Closure */

NODE_DEFINE(GlossyBsdfNode)
{
	NodeType* type = NodeType::add("glossy_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	static NodeEnum distribution_enum;
	distribution_enum.insert("sharp", CLOSURE_BSDF_REFLECTION_ID);
	distribution_enum.insert("beckmann", CLOSURE_BSDF_MICROFACET_BECKMANN_ID);
	distribution_enum.insert("GGX", CLOSURE_BSDF_MICROFACET_GGX_ID);
	distribution_enum.insert("ashikhmin_shirley", CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID);
	distribution_enum.insert("Multiscatter GGX", CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID);
	SOCKET_ENUM(distribution, "Distribution", distribution_enum, CLOSURE_BSDF_MICROFACET_GGX_ID);
	SOCKET_IN_FLOAT(roughness, "Roughness", 0.2f);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

GlossyBsdfNode::GlossyBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_MICROFACET_GGX_ID;
	distribution_orig = NBUILTIN_CLOSURES;
}

void GlossyBsdfNode::simplify_settings(Scene *scene)
{
	if(distribution_orig == NBUILTIN_CLOSURES) {
		roughness_orig = roughness;
		distribution_orig = distribution;
	}
	else {
		/* By default we use original values, so we don't worry about restoring
		 * defaults later one and can only do override when needed.
		 */
		roughness = roughness_orig;
		distribution = distribution_orig;
	}
	Integrator *integrator = scene->integrator;
	ShaderInput *roughness_input = input("Roughness");
	if(integrator->filter_glossy == 0.0f) {
		/* Fallback to Sharp closure for Roughness close to 0.
		 * Note: Keep the epsilon in sync with kernel!
		 */
		if(!roughness_input->link && roughness <= 1e-4f) {
			VLOG(1) << "Using sharp glossy BSDF.";
			distribution = CLOSURE_BSDF_REFLECTION_ID;
		}
	}
	else {
		/* If filter glossy is used we replace Sharp glossy with GGX so we can
		 * benefit from closure blur to remove unwanted noise.
		 */
		if(roughness_input->link == NULL &&
		   distribution == CLOSURE_BSDF_REFLECTION_ID)
		{
			VLOG(1) << "Using GGX glossy with filter glossy.";
			distribution = CLOSURE_BSDF_MICROFACET_GGX_ID;
			roughness = 0.0f;
		}
	}
	closure = distribution;
}

bool GlossyBsdfNode::has_integrator_dependency()
{
	ShaderInput *roughness_input = input("Roughness");
	return !roughness_input->link &&
	       (distribution == CLOSURE_BSDF_REFLECTION_ID || roughness <= 1e-4f);
}

void GlossyBsdfNode::compile(SVMCompiler& compiler)
{
	closure = distribution;

	if(closure == CLOSURE_BSDF_REFLECTION_ID)
		BsdfNode::compile(compiler, NULL, NULL);
	else if(closure == CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID)
		BsdfNode::compile(compiler, input("Roughness"), NULL, input("Color"));
	else
		BsdfNode::compile(compiler, input("Roughness"), NULL);
}

void GlossyBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "distribution");
	compiler.add(this, "node_glossy_bsdf");
}

/* Glass BSDF Closure */

NODE_DEFINE(GlassBsdfNode)
{
	NodeType* type = NodeType::add("glass_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	static NodeEnum distribution_enum;
	distribution_enum.insert("sharp", CLOSURE_BSDF_SHARP_GLASS_ID);
	distribution_enum.insert("beckmann", CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID);
	distribution_enum.insert("GGX", CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID);
	distribution_enum.insert("Multiscatter GGX", CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID);
	SOCKET_ENUM(distribution, "Distribution", distribution_enum, CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID);
	SOCKET_IN_FLOAT(roughness, "Roughness", 0.0f);
	SOCKET_IN_FLOAT(IOR, "IOR", 0.3f);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

GlassBsdfNode::GlassBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_SHARP_GLASS_ID;
	distribution_orig = NBUILTIN_CLOSURES;
}

void GlassBsdfNode::simplify_settings(Scene *scene)
{
	if(distribution_orig == NBUILTIN_CLOSURES) {
		roughness_orig = roughness;
		distribution_orig = distribution;
	}
	else {
		/* By default we use original values, so we don't worry about restoring
		 * defaults later one and can only do override when needed.
		 */
		roughness = roughness_orig;
		distribution = distribution_orig;
	}
	Integrator *integrator = scene->integrator;
	ShaderInput *roughness_input = input("Roughness");
	if(integrator->filter_glossy == 0.0f) {
		/* Fallback to Sharp closure for Roughness close to 0.
		 * Note: Keep the epsilon in sync with kernel!
		 */
		if(!roughness_input->link && roughness <= 1e-4f) {
			VLOG(1) << "Using sharp glass BSDF.";
			distribution = CLOSURE_BSDF_SHARP_GLASS_ID;
		}
	}
	else {
		/* If filter glossy is used we replace Sharp glossy with GGX so we can
		 * benefit from closure blur to remove unwanted noise.
		 */
		if(roughness_input->link == NULL &&
		   distribution == CLOSURE_BSDF_SHARP_GLASS_ID)
		{
			VLOG(1) << "Using GGX glass with filter glossy.";
			distribution = CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID;
			roughness = 0.0f;
		}
	}
	closure = distribution;
}

bool GlassBsdfNode::has_integrator_dependency()
{
	ShaderInput *roughness_input = input("Roughness");
	return !roughness_input->link &&
	       (distribution == CLOSURE_BSDF_SHARP_GLASS_ID || roughness <= 1e-4f);
}

void GlassBsdfNode::compile(SVMCompiler& compiler)
{
	closure = distribution;

	if(closure == CLOSURE_BSDF_SHARP_GLASS_ID)
		BsdfNode::compile(compiler, NULL, input("IOR"));
	else if(closure == CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID)
		BsdfNode::compile(compiler, input("Roughness"), input("IOR"), input("Color"));
	else
		BsdfNode::compile(compiler, input("Roughness"), input("IOR"));
}

void GlassBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "distribution");
	compiler.add(this, "node_glass_bsdf");
}

/* Refraction BSDF Closure */

NODE_DEFINE(RefractionBsdfNode)
{
	NodeType* type = NodeType::add("refraction_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	static NodeEnum distribution_enum;
	distribution_enum.insert("sharp", CLOSURE_BSDF_REFRACTION_ID);
	distribution_enum.insert("beckmann", CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID);
	distribution_enum.insert("GGX", CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID);
	SOCKET_ENUM(distribution, "Distribution", distribution_enum, CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID);

	SOCKET_IN_FLOAT(roughness, "Roughness", 0.0f);
	SOCKET_IN_FLOAT(IOR, "IOR", 0.3f);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

RefractionBsdfNode::RefractionBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_REFRACTION_ID;
	distribution_orig = NBUILTIN_CLOSURES;
}

void RefractionBsdfNode::simplify_settings(Scene *scene)
{
	if(distribution_orig == NBUILTIN_CLOSURES) {
		roughness_orig = roughness;
		distribution_orig = distribution;
	}
	else {
		/* By default we use original values, so we don't worry about restoring
		 * defaults later one and can only do override when needed.
		 */
		roughness = roughness_orig;
		distribution = distribution_orig;
	}
	Integrator *integrator = scene->integrator;
	ShaderInput *roughness_input = input("Roughness");
	if(integrator->filter_glossy == 0.0f) {
		/* Fallback to Sharp closure for Roughness close to 0.
		 * Note: Keep the epsilon in sync with kernel!
		 */
		if(!roughness_input->link && roughness <= 1e-4f) {
			VLOG(1) << "Using sharp refraction BSDF.";
			distribution = CLOSURE_BSDF_REFRACTION_ID;
		}
	}
	else {
		/* If filter glossy is used we replace Sharp glossy with GGX so we can
		 * benefit from closure blur to remove unwanted noise.
		 */
		if(roughness_input->link == NULL &&
		   distribution == CLOSURE_BSDF_REFRACTION_ID)
		{
			VLOG(1) << "Using GGX refraction with filter glossy.";
			distribution = CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID;
			roughness = 0.0f;
		}
	}
	closure = distribution;
}

bool RefractionBsdfNode::has_integrator_dependency()
{
	ShaderInput *roughness_input = input("Roughness");
	return !roughness_input->link &&
	       (distribution == CLOSURE_BSDF_REFRACTION_ID || roughness <= 1e-4f);
}

void RefractionBsdfNode::compile(SVMCompiler& compiler)
{
	closure = distribution;

	if(closure == CLOSURE_BSDF_REFRACTION_ID)
		BsdfNode::compile(compiler, NULL, input("IOR"));
	else
		BsdfNode::compile(compiler, input("Roughness"), input("IOR"));
}

void RefractionBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "distribution");
	compiler.add(this, "node_refraction_bsdf");
}

/* Toon BSDF Closure */

NODE_DEFINE(ToonBsdfNode)
{
	NodeType* type = NodeType::add("toon_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	static NodeEnum component_enum;
	component_enum.insert("diffuse", CLOSURE_BSDF_DIFFUSE_TOON_ID);
	component_enum.insert("glossy", CLOSURE_BSDF_GLOSSY_TOON_ID);
	SOCKET_ENUM(component, "Component", component_enum, CLOSURE_BSDF_DIFFUSE_TOON_ID);
	SOCKET_IN_FLOAT(size, "Size", 0.5f);
	SOCKET_IN_FLOAT(smooth, "Smooth", 0.0f);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

ToonBsdfNode::ToonBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_DIFFUSE_TOON_ID;
}

void ToonBsdfNode::compile(SVMCompiler& compiler)
{
	closure = component;
	
	BsdfNode::compile(compiler, input("Size"), input("Smooth"));
}

void ToonBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "component");
	compiler.add(this, "node_toon_bsdf");
}

/* Velvet BSDF Closure */

NODE_DEFINE(VelvetBsdfNode)
{
	NodeType* type = NodeType::add("velvet_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);
	SOCKET_IN_FLOAT(sigma, "Sigma", 1.0f);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

VelvetBsdfNode::VelvetBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_ASHIKHMIN_VELVET_ID;
}

void VelvetBsdfNode::compile(SVMCompiler& compiler)
{
	BsdfNode::compile(compiler, input("Sigma"), NULL);
}

void VelvetBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_velvet_bsdf");
}

/* Diffuse BSDF Closure */

NODE_DEFINE(DiffuseBsdfNode)
{
	NodeType* type = NodeType::add("diffuse_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);
	SOCKET_IN_FLOAT(roughness, "Roughness", 0.0f);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

DiffuseBsdfNode::DiffuseBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_DIFFUSE_ID;
}

void DiffuseBsdfNode::compile(SVMCompiler& compiler)
{
	BsdfNode::compile(compiler, input("Roughness"), NULL);
}

void DiffuseBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_diffuse_bsdf");
}

/* Translucent BSDF Closure */

NODE_DEFINE(TranslucentBsdfNode)
{
	NodeType* type = NodeType::add("translucent_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

TranslucentBsdfNode::TranslucentBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_TRANSLUCENT_ID;
}

void TranslucentBsdfNode::compile(SVMCompiler& compiler)
{
	BsdfNode::compile(compiler, NULL, NULL);
}

void TranslucentBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_translucent_bsdf");
}

/* Transparent BSDF Closure */

NODE_DEFINE(TransparentBsdfNode)
{
	NodeType* type = NodeType::add("transparent_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

TransparentBsdfNode::TransparentBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_TRANSPARENT_ID;
}

void TransparentBsdfNode::compile(SVMCompiler& compiler)
{
	BsdfNode::compile(compiler, NULL, NULL);
}

void TransparentBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_transparent_bsdf");
}

/* Subsurface Scattering Closure */

NODE_DEFINE(SubsurfaceScatteringNode)
{
	NodeType* type = NodeType::add("subsurface_scattering", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	static NodeEnum falloff_enum;
	falloff_enum.insert("cubic", CLOSURE_BSSRDF_CUBIC_ID);
	falloff_enum.insert("gaussian", CLOSURE_BSSRDF_GAUSSIAN_ID);
	falloff_enum.insert("burley", CLOSURE_BSSRDF_BURLEY_ID);
	SOCKET_ENUM(falloff, "Falloff", falloff_enum, CLOSURE_BSSRDF_BURLEY_ID);
	SOCKET_IN_FLOAT(scale, "Scale", 0.01f);
	SOCKET_IN_VECTOR(radius, "Radius", make_float3(0.1f, 0.1f, 0.1f));
	SOCKET_IN_FLOAT(sharpness, "Sharpness", 0.0f);
	SOCKET_IN_FLOAT(texture_blur, "Texture Blur", 1.0f);

	SOCKET_OUT_CLOSURE(BSSRDF, "BSSRDF");

	return type;
}

SubsurfaceScatteringNode::SubsurfaceScatteringNode()
: BsdfNode(node_type)
{
	closure = falloff;
}

void SubsurfaceScatteringNode::compile(SVMCompiler& compiler)
{
	closure = falloff;
	BsdfNode::compile(compiler, input("Scale"), input("Texture Blur"), input("Radius"), input("Sharpness"));
}

void SubsurfaceScatteringNode::compile(OSLCompiler& compiler)
{
	closure = falloff;
	compiler.parameter(this, "falloff");
	compiler.add(this, "node_subsurface_scattering");
}

bool SubsurfaceScatteringNode::has_bssrdf_bump()
{
	/* detect if anything is plugged into the normal input besides the default */
	ShaderInput *normal_in = input("Normal");
	return (normal_in->link && normal_in->link->parent->special_type != SHADER_SPECIAL_TYPE_GEOMETRY);
}

/* Emissive Closure */

NODE_DEFINE(EmissionNode)
{
	NodeType* type = NodeType::add("emission", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_FLOAT(strength, "Strength", 10.0f);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(emission, "Emission");

	return type;
}

EmissionNode::EmissionNode()
: ShaderNode(node_type)
{
}

void EmissionNode::compile(SVMCompiler& compiler)
{
	ShaderInput *color_in = input("Color");
	ShaderInput *strength_in = input("Strength");

	if(color_in->link || strength_in->link) {
		compiler.add_node(NODE_EMISSION_WEIGHT,
		                  compiler.stack_assign(color_in),
		                  compiler.stack_assign(strength_in));
	}
	else
		compiler.add_node(NODE_CLOSURE_SET_WEIGHT, color * strength);

	compiler.add_node(NODE_CLOSURE_EMISSION, compiler.closure_mix_weight_offset());
}

void EmissionNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_emission");
}

void EmissionNode::constant_fold(const ConstantFolder& folder)
{
	ShaderInput *color_in = input("Color");
	ShaderInput *strength_in = input("Strength");

	if((!color_in->link && color == make_float3(0.0f, 0.0f, 0.0f)) ||
	   (!strength_in->link && strength == 0.0f))
	{
		folder.discard();
	}
}

/* Background Closure */

NODE_DEFINE(BackgroundNode)
{
	NodeType* type = NodeType::add("background_shader", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_FLOAT(strength, "Strength", 1.0f);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(background, "Background");

	return type;
}

BackgroundNode::BackgroundNode()
: ShaderNode(node_type)
{
}

void BackgroundNode::compile(SVMCompiler& compiler)
{
	ShaderInput *color_in = input("Color");
	ShaderInput *strength_in = input("Strength");

	if(color_in->link || strength_in->link) {
		compiler.add_node(NODE_EMISSION_WEIGHT,
		                  compiler.stack_assign(color_in),
		                  compiler.stack_assign(strength_in));
	}
	else
		compiler.add_node(NODE_CLOSURE_SET_WEIGHT, color*strength);

	compiler.add_node(NODE_CLOSURE_BACKGROUND, compiler.closure_mix_weight_offset());
}

void BackgroundNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_background");
}

void BackgroundNode::constant_fold(const ConstantFolder& folder)
{
	ShaderInput *color_in = input("Color");
	ShaderInput *strength_in = input("Strength");

	if((!color_in->link && color == make_float3(0.0f, 0.0f, 0.0f)) ||
	   (!strength_in->link && strength == 0.0f))
	{
		folder.discard();
	}
}

/* Holdout Closure */

NODE_DEFINE(HoldoutNode)
{
	NodeType* type = NodeType::add("holdout", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);
	SOCKET_IN_FLOAT(volume_mix_weight, "VolumeMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(holdout, "Holdout");

	return type;
}

HoldoutNode::HoldoutNode()
: ShaderNode(node_type)
{
}

void HoldoutNode::compile(SVMCompiler& compiler)
{
	float3 value = make_float3(1.0f, 1.0f, 1.0f);

	compiler.add_node(NODE_CLOSURE_SET_WEIGHT, value);
	compiler.add_node(NODE_CLOSURE_HOLDOUT, compiler.closure_mix_weight_offset());
}

void HoldoutNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_holdout");
}

/* Ambient Occlusion */

NODE_DEFINE(AmbientOcclusionNode)
{
	NodeType* type = NodeType::add("ambient_occlusion", create, NodeType::SHADER);

	SOCKET_IN_NORMAL(normal_osl, "NormalIn", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL | SocketType::OSL_INTERNAL);
	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(AO, "AO");

	return type;
}

AmbientOcclusionNode::AmbientOcclusionNode()
: ShaderNode(node_type)
{
}

void AmbientOcclusionNode::compile(SVMCompiler& compiler)
{
	ShaderInput *color_in = input("Color");

	if(color_in->link)
		compiler.add_node(NODE_CLOSURE_WEIGHT, compiler.stack_assign(color_in));
	else
		compiler.add_node(NODE_CLOSURE_SET_WEIGHT, color);

	compiler.add_node(NODE_CLOSURE_AMBIENT_OCCLUSION, compiler.closure_mix_weight_offset());
}

void AmbientOcclusionNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_ambient_occlusion");
}

/* Volume Closure */

VolumeNode::VolumeNode(const NodeType *node_type)
: ShaderNode(node_type)
{
	closure = CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID;
}

void VolumeNode::compile(SVMCompiler& compiler, ShaderInput *param1, ShaderInput *param2)
{
	ShaderInput *color_in = input("Color");

	if(color_in->link)
		compiler.add_node(NODE_CLOSURE_WEIGHT, compiler.stack_assign(color_in));
	else
		compiler.add_node(NODE_CLOSURE_SET_WEIGHT, color);
	
	compiler.add_node(NODE_CLOSURE_VOLUME,
		compiler.encode_uchar4(closure,
			(param1)? compiler.stack_assign(param1): SVM_STACK_INVALID,
			(param2)? compiler.stack_assign(param2): SVM_STACK_INVALID,
			compiler.closure_mix_weight_offset()),
		__float_as_int((param1)? get_float(param1->socket_type): 0.0f),
		__float_as_int((param2)? get_float(param2->socket_type): 0.0f));
}

void VolumeNode::compile(SVMCompiler& compiler)
{
	compile(compiler, NULL, NULL);
}

void VolumeNode::compile(OSLCompiler& /*compiler*/)
{
	assert(0);
}

/* Absorption Volume Closure */

NODE_DEFINE(AbsorptionVolumeNode)
{
	NodeType* type = NodeType::add("absorption_volume", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_FLOAT(density, "Density", 1.0f);
	SOCKET_IN_FLOAT(volume_mix_weight, "VolumeMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(volume, "Volume");

	return type;
}

AbsorptionVolumeNode::AbsorptionVolumeNode()
: VolumeNode(node_type)
{
	closure = CLOSURE_VOLUME_ABSORPTION_ID;
}

void AbsorptionVolumeNode::compile(SVMCompiler& compiler)
{
	VolumeNode::compile(compiler, input("Density"), NULL);
}

void AbsorptionVolumeNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_absorption_volume");
}

/* Scatter Volume Closure */

NODE_DEFINE(ScatterVolumeNode)
{
	NodeType* type = NodeType::add("scatter_volume", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_FLOAT(density, "Density", 1.0f);
	SOCKET_IN_FLOAT(anisotropy, "Anisotropy", 0.0f);
	SOCKET_IN_FLOAT(volume_mix_weight, "VolumeMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	SOCKET_OUT_CLOSURE(volume, "Volume");

	return type;
}

ScatterVolumeNode::ScatterVolumeNode()
: VolumeNode(node_type)
{
	closure = CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID;
}

void ScatterVolumeNode::compile(SVMCompiler& compiler)
{
	VolumeNode::compile(compiler, input("Density"), input("Anisotropy"));
}

void ScatterVolumeNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_scatter_volume");
}

/* Hair BSDF Closure */

NODE_DEFINE(HairBsdfNode)
{
	NodeType* type = NodeType::add("hair_bsdf", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.8f, 0.8f, 0.8f));
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(surface_mix_weight, "SurfaceMixWeight", 0.0f, SocketType::SVM_INTERNAL);

	static NodeEnum component_enum;
	component_enum.insert("reflection", CLOSURE_BSDF_HAIR_REFLECTION_ID);
	component_enum.insert("transmission", CLOSURE_BSDF_HAIR_TRANSMISSION_ID);
	SOCKET_ENUM(component, "Component", component_enum, CLOSURE_BSDF_HAIR_REFLECTION_ID);
	SOCKET_IN_FLOAT(offset, "Offset", 0.0f);
	SOCKET_IN_FLOAT(roughness_u, "RoughnessU", 0.2f);
	SOCKET_IN_FLOAT(roughness_v, "RoughnessV", 0.2f);
	SOCKET_IN_VECTOR(tangent, "Tangent", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_CLOSURE(BSDF, "BSDF");

	return type;
}

HairBsdfNode::HairBsdfNode()
: BsdfNode(node_type)
{
	closure = CLOSURE_BSDF_HAIR_REFLECTION_ID;
}

void HairBsdfNode::compile(SVMCompiler& compiler)
{
	closure = component;

	BsdfNode::compile(compiler, input("RoughnessU"), input("RoughnessV"), input("Offset"));
}

void HairBsdfNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "component");
	compiler.add(this, "node_hair_bsdf");
}

/* Geometry */

NODE_DEFINE(GeometryNode)
{
	NodeType* type = NodeType::add("geometry", create, NodeType::SHADER);

	SOCKET_IN_NORMAL(normal_osl, "NormalIn", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL | SocketType::OSL_INTERNAL);

	SOCKET_OUT_POINT(position, "Position");
	SOCKET_OUT_NORMAL(normal, "Normal");
	SOCKET_OUT_NORMAL(tangent, "Tangent");
	SOCKET_OUT_NORMAL(true_normal, "True Normal");
	SOCKET_OUT_VECTOR(incoming, "Incoming");
	SOCKET_OUT_POINT(parametric, "Parametric");
	SOCKET_OUT_FLOAT(backfacing, "Backfacing");
	SOCKET_OUT_FLOAT(pointiness, "Pointiness");

	return type;
}

GeometryNode::GeometryNode()
: ShaderNode(node_type)
{
	special_type = SHADER_SPECIAL_TYPE_GEOMETRY;
}

void GeometryNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(shader->has_surface) {
		if(!output("Tangent")->links.empty()) {
			attributes->add(ATTR_STD_GENERATED);
		}
		if(!output("Pointiness")->links.empty()) {
			attributes->add(ATTR_STD_POINTINESS);
		}
	}

	ShaderNode::attributes(shader, attributes);
}

void GeometryNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *out;
	ShaderNodeType geom_node = NODE_GEOMETRY;
	ShaderNodeType attr_node = NODE_ATTR;

	if(bump == SHADER_BUMP_DX) {
		geom_node = NODE_GEOMETRY_BUMP_DX;
		attr_node = NODE_ATTR_BUMP_DX;
	}
	else if(bump == SHADER_BUMP_DY) {
		geom_node = NODE_GEOMETRY_BUMP_DY;
		attr_node = NODE_ATTR_BUMP_DY;
	}
	
	out = output("Position");
	if(!out->links.empty()) {
		compiler.add_node(geom_node, NODE_GEOM_P, compiler.stack_assign(out));
	}

	out = output("Normal");
	if(!out->links.empty()) {
		compiler.add_node(geom_node, NODE_GEOM_N, compiler.stack_assign(out));
	}

	out = output("Tangent");
	if(!out->links.empty()) {
		compiler.add_node(geom_node, NODE_GEOM_T, compiler.stack_assign(out));
	}

	out = output("True Normal");
	if(!out->links.empty()) {
		compiler.add_node(geom_node, NODE_GEOM_Ng, compiler.stack_assign(out));
	}

	out = output("Incoming");
	if(!out->links.empty()) {
		compiler.add_node(geom_node, NODE_GEOM_I, compiler.stack_assign(out));
	}

	out = output("Parametric");
	if(!out->links.empty()) {
		compiler.add_node(geom_node, NODE_GEOM_uv, compiler.stack_assign(out));
	}

	out = output("Backfacing");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_backfacing, compiler.stack_assign(out));
	}

	out = output("Pointiness");
	if(!out->links.empty()) {
		if(compiler.output_type() != SHADER_TYPE_VOLUME) {
			compiler.add_node(attr_node,
			                  ATTR_STD_POINTINESS,
			                  compiler.stack_assign(out),
			                  NODE_ATTR_FLOAT);
		}
		else {
			compiler.add_node(NODE_VALUE_F, __float_as_int(0.0f), compiler.stack_assign(out));
		}
	}
}

void GeometryNode::compile(OSLCompiler& compiler)
{
	if(bump == SHADER_BUMP_DX)
		compiler.parameter("bump_offset", "dx");
	else if(bump == SHADER_BUMP_DY)
		compiler.parameter("bump_offset", "dy");
	else
		compiler.parameter("bump_offset", "center");

	compiler.add(this, "node_geometry");
}

/* TextureCoordinate */

NODE_DEFINE(TextureCoordinateNode)
{
	NodeType* type = NodeType::add("texture_coordinate", create, NodeType::SHADER);

	SOCKET_BOOLEAN(from_dupli, "From Dupli", false);
	SOCKET_BOOLEAN(use_transform, "Use Transform", false);
	SOCKET_TRANSFORM(ob_tfm, "Object Transform", transform_identity());

	SOCKET_IN_NORMAL(normal_osl, "NormalIn", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL | SocketType::OSL_INTERNAL);

	SOCKET_OUT_POINT(generated, "Generated");
	SOCKET_OUT_NORMAL(normal, "Normal");
	SOCKET_OUT_POINT(UV, "UV");
	SOCKET_OUT_POINT(object, "Object");
	SOCKET_OUT_POINT(camera, "Camera");
	SOCKET_OUT_POINT(window, "Window");
	SOCKET_OUT_NORMAL(reflection, "Reflection");

	return type;
}

TextureCoordinateNode::TextureCoordinateNode()
: ShaderNode(node_type)
{
}

void TextureCoordinateNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(shader->has_surface) {
		if(!from_dupli) {
			if(!output("Generated")->links.empty())
				attributes->add(ATTR_STD_GENERATED);
			if(!output("UV")->links.empty())
				attributes->add(ATTR_STD_UV);
		}
	}

	if(shader->has_volume) {
		if(!from_dupli) {
			if(!output("Generated")->links.empty()) {
				attributes->add(ATTR_STD_GENERATED_TRANSFORM);
			}
		}
	}

	ShaderNode::attributes(shader, attributes);
}

void TextureCoordinateNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *out;
	ShaderNodeType texco_node = NODE_TEX_COORD;
	ShaderNodeType attr_node = NODE_ATTR;
	ShaderNodeType geom_node = NODE_GEOMETRY;

	if(bump == SHADER_BUMP_DX) {
		texco_node = NODE_TEX_COORD_BUMP_DX;
		attr_node = NODE_ATTR_BUMP_DX;
		geom_node = NODE_GEOMETRY_BUMP_DX;
	}
	else if(bump == SHADER_BUMP_DY) {
		texco_node = NODE_TEX_COORD_BUMP_DY;
		attr_node = NODE_ATTR_BUMP_DY;
		geom_node = NODE_GEOMETRY_BUMP_DY;
	}
	
	out = output("Generated");
	if(!out->links.empty()) {
		if(compiler.background) {
			compiler.add_node(geom_node, NODE_GEOM_P, compiler.stack_assign(out));
		}
		else {
			if(from_dupli) {
				compiler.add_node(texco_node, NODE_TEXCO_DUPLI_GENERATED, compiler.stack_assign(out));
			}
			else if(compiler.output_type() == SHADER_TYPE_VOLUME) {
				compiler.add_node(texco_node, NODE_TEXCO_VOLUME_GENERATED, compiler.stack_assign(out));
			}
			else {
				int attr = compiler.attribute(ATTR_STD_GENERATED);
				compiler.add_node(attr_node, attr, compiler.stack_assign(out), NODE_ATTR_FLOAT3);
			}
		}
	}

	out = output("Normal");
	if(!out->links.empty()) {
		compiler.add_node(texco_node, NODE_TEXCO_NORMAL, compiler.stack_assign(out));
	}

	out = output("UV");
	if(!out->links.empty()) {
		if(from_dupli) {
			compiler.add_node(texco_node, NODE_TEXCO_DUPLI_UV, compiler.stack_assign(out));
		}
		else {
			int attr = compiler.attribute(ATTR_STD_UV);
			compiler.add_node(attr_node, attr, compiler.stack_assign(out), NODE_ATTR_FLOAT3);
		}
	}

	out = output("Object");
	if(!out->links.empty()) {
		compiler.add_node(texco_node, NODE_TEXCO_OBJECT, compiler.stack_assign(out), use_transform);
		if(use_transform) {
			Transform ob_itfm = transform_inverse(ob_tfm);
			compiler.add_node(ob_itfm.x);
			compiler.add_node(ob_itfm.y);
			compiler.add_node(ob_itfm.z);
			compiler.add_node(ob_itfm.w);
		}
	}

	out = output("Camera");
	if(!out->links.empty()) {
		compiler.add_node(texco_node, NODE_TEXCO_CAMERA, compiler.stack_assign(out));
	}

	out = output("Window");
	if(!out->links.empty()) {
		compiler.add_node(texco_node, NODE_TEXCO_WINDOW, compiler.stack_assign(out));
	}

	out = output("Reflection");
	if(!out->links.empty()) {
		if(compiler.background) {
			compiler.add_node(geom_node, NODE_GEOM_I, compiler.stack_assign(out));
		}
		else {
			compiler.add_node(texco_node, NODE_TEXCO_REFLECTION, compiler.stack_assign(out));
		}
	}
}

void TextureCoordinateNode::compile(OSLCompiler& compiler)
{
	if(bump == SHADER_BUMP_DX)
		compiler.parameter("bump_offset", "dx");
	else if(bump == SHADER_BUMP_DY)
		compiler.parameter("bump_offset", "dy");
	else
		compiler.parameter("bump_offset", "center");
	
	if(compiler.background)
		compiler.parameter("is_background", true);
	if(compiler.output_type() == SHADER_TYPE_VOLUME)
		compiler.parameter("is_volume", true);
	compiler.parameter(this, "use_transform");
	Transform ob_itfm = transform_transpose(transform_inverse(ob_tfm));
	compiler.parameter("object_itfm", ob_itfm);

	compiler.parameter(this, "from_dupli");

	compiler.add(this, "node_texture_coordinate");
}

/* UV Map */

NODE_DEFINE(UVMapNode)
{
	NodeType* type = NodeType::add("uvmap", create, NodeType::SHADER);

	SOCKET_IN_STRING(attribute, "attribute", ustring(""));
	SOCKET_IN_BOOLEAN(from_dupli, "from dupli", false);

	SOCKET_OUT_POINT(UV, "UV");

	return type;
}

UVMapNode::UVMapNode()
: ShaderNode(node_type)
{
}

void UVMapNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(shader->has_surface) {
		if(!from_dupli) {
			if(!output("UV")->links.empty()) {
				if(attribute != "")
					attributes->add(attribute);
				else
					attributes->add(ATTR_STD_UV);
			}
		}
	}

	ShaderNode::attributes(shader, attributes);
}

void UVMapNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *out = output("UV");
	ShaderNodeType texco_node = NODE_TEX_COORD;
	ShaderNodeType attr_node = NODE_ATTR;
	int attr;

	if(bump == SHADER_BUMP_DX) {
		texco_node = NODE_TEX_COORD_BUMP_DX;
		attr_node = NODE_ATTR_BUMP_DX;
	}
	else if(bump == SHADER_BUMP_DY) {
		texco_node = NODE_TEX_COORD_BUMP_DY;
		attr_node = NODE_ATTR_BUMP_DY;
	}

	if(!out->links.empty()) {
		if(from_dupli) {
			compiler.add_node(texco_node, NODE_TEXCO_DUPLI_UV, compiler.stack_assign(out));
		}
		else {
			if(attribute != "")
				attr = compiler.attribute(attribute);
			else
				attr = compiler.attribute(ATTR_STD_UV);

			compiler.add_node(attr_node, attr, compiler.stack_assign(out), NODE_ATTR_FLOAT3);
		}
	}
}

void UVMapNode::compile(OSLCompiler& compiler)
{
	if(bump == SHADER_BUMP_DX)
		compiler.parameter("bump_offset", "dx");
	else if(bump == SHADER_BUMP_DY)
		compiler.parameter("bump_offset", "dy");
	else
		compiler.parameter("bump_offset", "center");

	compiler.parameter(this, "from_dupli");
	compiler.parameter(this, "attribute");
	compiler.add(this, "node_uv_map");
}

/* Light Path */

NODE_DEFINE(LightPathNode)
{
	NodeType* type = NodeType::add("light_path", create, NodeType::SHADER);

	SOCKET_OUT_FLOAT(is_camera_ray, "Is Camera Ray");
	SOCKET_OUT_FLOAT(is_shadow_ray, "Is Shadow Ray");
	SOCKET_OUT_FLOAT(is_diffuse_ray, "Is Diffuse Ray");
	SOCKET_OUT_FLOAT(is_glossy_ray, "Is Glossy Ray");
	SOCKET_OUT_FLOAT(is_singular_ray, "Is Singular Ray");
	SOCKET_OUT_FLOAT(is_reflection_ray, "Is Reflection Ray");
	SOCKET_OUT_FLOAT(is_transmission_ray, "Is Transmission Ray");
	SOCKET_OUT_FLOAT(is_volume_scatter_ray, "Is Volume Scatter Ray");
	SOCKET_OUT_FLOAT(ray_length, "Ray Length");
	SOCKET_OUT_FLOAT(ray_depth, "Ray Depth");
	SOCKET_OUT_FLOAT(diffuse_depth, "Diffuse Depth");
	SOCKET_OUT_FLOAT(glossy_depth, "Glossy Depth");
	SOCKET_OUT_FLOAT(transparent_depth, "Transparent Depth");
	SOCKET_OUT_FLOAT(transmission_depth, "Transmission Depth");

	return type;
}

LightPathNode::LightPathNode()
: ShaderNode(node_type)
{
}

void LightPathNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *out;

	out = output("Is Camera Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_camera, compiler.stack_assign(out));
	}

	out = output("Is Shadow Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_shadow, compiler.stack_assign(out));
	}

	out = output("Is Diffuse Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_diffuse, compiler.stack_assign(out));
	}

	out = output("Is Glossy Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_glossy, compiler.stack_assign(out));
	}

	out = output("Is Singular Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_singular, compiler.stack_assign(out));
	}

	out = output("Is Reflection Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_reflection, compiler.stack_assign(out));
	}


	out = output("Is Transmission Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_transmission, compiler.stack_assign(out));
	}
	
	out = output("Is Volume Scatter Ray");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_volume_scatter, compiler.stack_assign(out));
	}

	out = output("Ray Length");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_ray_length, compiler.stack_assign(out));
	}
	
	out = output("Ray Depth");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_ray_depth, compiler.stack_assign(out));
	}

	out = output("Diffuse Depth");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_ray_diffuse, compiler.stack_assign(out));
	}

	out = output("Glossy Depth");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_ray_glossy, compiler.stack_assign(out));
	}

	out = output("Transparent Depth");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_ray_transparent, compiler.stack_assign(out));
	}

	out = output("Transmission Depth");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_PATH, NODE_LP_ray_transmission, compiler.stack_assign(out));
	}
}

void LightPathNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_light_path");
}

/* Light Falloff */

NODE_DEFINE(LightFalloffNode)
{
	NodeType* type = NodeType::add("light_fallof", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(strength, "Strength", 100.0f);
	SOCKET_IN_FLOAT(smooth, "Smooth", 0.0f);

	SOCKET_OUT_FLOAT(quadratic, "Quadratic");
	SOCKET_OUT_FLOAT(linear, "Linear");
	SOCKET_OUT_FLOAT(constant, "Constant");

	return type;
}

LightFalloffNode::LightFalloffNode()
: ShaderNode(node_type)
{
}

void LightFalloffNode::compile(SVMCompiler& compiler)
{
	ShaderInput *strength_in = input("Strength");
	ShaderInput *smooth_in = input("Smooth");

	ShaderOutput *out = output("Quadratic");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_FALLOFF, NODE_LIGHT_FALLOFF_QUADRATIC,
			compiler.encode_uchar4(
				compiler.stack_assign(strength_in),
				compiler.stack_assign(smooth_in),
				compiler.stack_assign(out)));
	}

	out = output("Linear");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_FALLOFF, NODE_LIGHT_FALLOFF_LINEAR,
			compiler.encode_uchar4(
				compiler.stack_assign(strength_in),
				compiler.stack_assign(smooth_in),
				compiler.stack_assign(out)));
	}

	out = output("Constant");
	if(!out->links.empty()) {
		compiler.add_node(NODE_LIGHT_FALLOFF, NODE_LIGHT_FALLOFF_CONSTANT,
			compiler.encode_uchar4(
				compiler.stack_assign(strength_in),
				compiler.stack_assign(smooth_in),
				compiler.stack_assign(out)));
	}
}

void LightFalloffNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_light_falloff");
}

/* Object Info */

NODE_DEFINE(ObjectInfoNode)
{
	NodeType* type = NodeType::add("object_info", create, NodeType::SHADER);

	SOCKET_OUT_VECTOR(location, "Location");
	SOCKET_OUT_FLOAT(object_index, "Object Index");
	SOCKET_OUT_FLOAT(material_index, "Material Index");
	SOCKET_OUT_FLOAT(random, "Random");

	return type;
}

ObjectInfoNode::ObjectInfoNode()
: ShaderNode(node_type)
{
}

void ObjectInfoNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *out = output("Location");
	if(!out->links.empty()) {
		compiler.add_node(NODE_OBJECT_INFO, NODE_INFO_OB_LOCATION, compiler.stack_assign(out));
	}

	out = output("Object Index");
	if(!out->links.empty()) {
		compiler.add_node(NODE_OBJECT_INFO, NODE_INFO_OB_INDEX, compiler.stack_assign(out));
	}

	out = output("Material Index");
	if(!out->links.empty()) {
		compiler.add_node(NODE_OBJECT_INFO, NODE_INFO_MAT_INDEX, compiler.stack_assign(out));
	}

	out = output("Random");
	if(!out->links.empty()) {
		compiler.add_node(NODE_OBJECT_INFO, NODE_INFO_OB_RANDOM, compiler.stack_assign(out));
	}
}

void ObjectInfoNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_object_info");
}

/* Particle Info */

NODE_DEFINE(ParticleInfoNode)
{
	NodeType* type = NodeType::add("particle_info", create, NodeType::SHADER);

	SOCKET_OUT_FLOAT(index, "Index");
	SOCKET_OUT_FLOAT(age, "Age");
	SOCKET_OUT_FLOAT(lifetime, "Lifetime");
	SOCKET_OUT_POINT(location, "Location");
#if 0	/* not yet supported */
	SOCKET_OUT_QUATERNION(rotation, "Rotation");
#endif
	SOCKET_OUT_FLOAT(size, "Size");
	SOCKET_OUT_VECTOR(velocity, "Velocity");
	SOCKET_OUT_VECTOR(angular_velocity, "Angular Velocity");

	return type;
}

ParticleInfoNode::ParticleInfoNode()
: ShaderNode(node_type)
{
}

void ParticleInfoNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(!output("Index")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);
	if(!output("Age")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);
	if(!output("Lifetime")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);
	if(!output("Location")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);
#if 0	/* not yet supported */
	if(!output("Rotation")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);
#endif
	if(!output("Size")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);
	if(!output("Velocity")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);
	if(!output("Angular Velocity")->links.empty())
		attributes->add(ATTR_STD_PARTICLE);

	ShaderNode::attributes(shader, attributes);
}

void ParticleInfoNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *out;
	
	out = output("Index");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_INDEX, compiler.stack_assign(out));
	}
	
	out = output("Age");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_AGE, compiler.stack_assign(out));
	}
	
	out = output("Lifetime");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_LIFETIME, compiler.stack_assign(out));
	}
	
	out = output("Location");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_LOCATION, compiler.stack_assign(out));
	}
	
	/* quaternion data is not yet supported by Cycles */
#if 0
	out = output("Rotation");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_ROTATION, compiler.stack_assign(out));
	}
#endif
	
	out = output("Size");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_SIZE, compiler.stack_assign(out));
	}
	
	out = output("Velocity");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_VELOCITY, compiler.stack_assign(out));
	}
	
	out = output("Angular Velocity");
	if(!out->links.empty()) {
		compiler.add_node(NODE_PARTICLE_INFO, NODE_INFO_PAR_ANGULAR_VELOCITY, compiler.stack_assign(out));
	}
}

void ParticleInfoNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_particle_info");
}

/* Hair Info */

NODE_DEFINE(HairInfoNode)
{
	NodeType* type = NodeType::add("hair_info", create, NodeType::SHADER);

	SOCKET_OUT_FLOAT(is_strand, "Is Strand");
	SOCKET_OUT_FLOAT(intercept, "Intercept");
	SOCKET_OUT_FLOAT(thickness, "Thickness");
	SOCKET_OUT_NORMAL(tangent Normal, "Tangent Normal");
#if 0 /*output for minimum hair width transparency - deactivated */
	SOCKET_OUT_FLOAT(fade, "Fade");
#endif

	return type;
}

HairInfoNode::HairInfoNode()
: ShaderNode(node_type)
{
}

void HairInfoNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(shader->has_surface) {
		ShaderOutput *intercept_out = output("Intercept");

		if(!intercept_out->links.empty())
			attributes->add(ATTR_STD_CURVE_INTERCEPT);
	}

	ShaderNode::attributes(shader, attributes);
}

void HairInfoNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *out;
	
	out = output("Is Strand");
	if(!out->links.empty()) {
		compiler.add_node(NODE_HAIR_INFO, NODE_INFO_CURVE_IS_STRAND, compiler.stack_assign(out));
	}

	out = output("Intercept");
	if(!out->links.empty()) {
		int attr = compiler.attribute(ATTR_STD_CURVE_INTERCEPT);
		compiler.add_node(NODE_ATTR, attr, compiler.stack_assign(out), NODE_ATTR_FLOAT);
	}

	out = output("Thickness");
	if(!out->links.empty()) {
		compiler.add_node(NODE_HAIR_INFO, NODE_INFO_CURVE_THICKNESS, compiler.stack_assign(out));
	}

	out = output("Tangent Normal");
	if(!out->links.empty()) {
		compiler.add_node(NODE_HAIR_INFO, NODE_INFO_CURVE_TANGENT_NORMAL, compiler.stack_assign(out));
	}

	/*out = output("Fade");
	if(!out->links.empty()) {
		compiler.add_node(NODE_HAIR_INFO, NODE_INFO_CURVE_FADE, compiler.stack_assign(out));
	}*/

}

void HairInfoNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_hair_info");
}

/* Value */

NODE_DEFINE(ValueNode)
{
	NodeType* type = NodeType::add("value", create, NodeType::SHADER);

	SOCKET_FLOAT(value, "Value", 0.0f);
	SOCKET_OUT_FLOAT(value, "Value");

	return type;
}

ValueNode::ValueNode()
: ShaderNode(node_type)
{
}

void ValueNode::constant_fold(const ConstantFolder& folder)
{
	folder.make_constant(value);
}

void ValueNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *val_out = output("Value");

	compiler.add_node(NODE_VALUE_F, __float_as_int(value), compiler.stack_assign(val_out));
}

void ValueNode::compile(OSLCompiler& compiler)
{
	compiler.parameter("value_value", value);
	compiler.add(this, "node_value");
}

/* Color */

NODE_DEFINE(ColorNode)
{
	NodeType* type = NodeType::add("color", create, NodeType::SHADER);

	SOCKET_COLOR(value, "Value", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

ColorNode::ColorNode()
: ShaderNode(node_type)
{
}

void ColorNode::constant_fold(const ConstantFolder& folder)
{
	folder.make_constant(value);
}

void ColorNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *color_out = output("Color");

	if(!color_out->links.empty()) {
		compiler.add_node(NODE_VALUE_V, compiler.stack_assign(color_out));
		compiler.add_node(NODE_VALUE_V, value);
	}
}

void ColorNode::compile(OSLCompiler& compiler)
{
	compiler.parameter_color("color_value", value);

	compiler.add(this, "node_value");
}

/* Add Closure */

NODE_DEFINE(AddClosureNode)
{
	NodeType* type = NodeType::add("add_closure", create, NodeType::SHADER);

	SOCKET_IN_CLOSURE(closure1, "Closure1");
	SOCKET_IN_CLOSURE(closure2, "Closure2");
	SOCKET_OUT_CLOSURE(closure, "Closure");

	return type;
}

AddClosureNode::AddClosureNode()
: ShaderNode(node_type)
{
	special_type = SHADER_SPECIAL_TYPE_COMBINE_CLOSURE;
}

void AddClosureNode::compile(SVMCompiler& /*compiler*/)
{
	/* handled in the SVM compiler */
}

void AddClosureNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_add_closure");
}

void AddClosureNode::constant_fold(const ConstantFolder& folder)
{
	ShaderInput *closure1_in = input("Closure1");
	ShaderInput *closure2_in = input("Closure2");

	/* remove useless add closures nodes */
	if(!closure1_in->link) {
		folder.bypass_or_discard(closure2_in);
	}
	else if(!closure2_in->link) {
		folder.bypass_or_discard(closure1_in);
	}
}

/* Mix Closure */

NODE_DEFINE(MixClosureNode)
{
	NodeType* type = NodeType::add("mix_closure", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(fac, "Fac", 0.5f);
	SOCKET_IN_CLOSURE(closure1, "Closure1");
	SOCKET_IN_CLOSURE(closure2, "Closure2");

	SOCKET_OUT_CLOSURE(closure, "Closure");

	return type;
}

MixClosureNode::MixClosureNode()
: ShaderNode(node_type)
{
	special_type = SHADER_SPECIAL_TYPE_COMBINE_CLOSURE;
}

void MixClosureNode::compile(SVMCompiler& /*compiler*/)
{
	/* handled in the SVM compiler */
}

void MixClosureNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_mix_closure");
}

void MixClosureNode::constant_fold(const ConstantFolder& folder)
{
	ShaderInput *fac_in = input("Fac");
	ShaderInput *closure1_in = input("Closure1");
	ShaderInput *closure2_in = input("Closure2");

	/* remove useless mix closures nodes */
	if(closure1_in->link == closure2_in->link) {
		folder.bypass_or_discard(closure1_in);
	}
	/* remove unused mix closure input when factor is 0.0 or 1.0
	 * check for closure links and make sure factor link is disconnected */
	else if(!fac_in->link) {
		/* factor 0.0 */
		if(fac <= 0.0f) {
			folder.bypass_or_discard(closure1_in);
		}
		/* factor 1.0 */
		else if(fac >= 1.0f) {
			folder.bypass_or_discard(closure2_in);
		}
	}
}

/* Mix Closure */

NODE_DEFINE(MixClosureWeightNode)
{
	NodeType* type = NodeType::add("mix_closure_weight", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(weight, "Weight", 1.0f);
	SOCKET_IN_FLOAT(fac, "Fac", 1.0f);

	SOCKET_OUT_FLOAT(weight1, "Weight1");
	SOCKET_OUT_FLOAT(weight2, "Weight2");

	return type;
}

MixClosureWeightNode::MixClosureWeightNode()
: ShaderNode(node_type)
{
}

void MixClosureWeightNode::compile(SVMCompiler& compiler)
{
	ShaderInput *weight_in = input("Weight");
	ShaderInput *fac_in = input("Fac");
	ShaderOutput *weight1_out = output("Weight1");
	ShaderOutput *weight2_out = output("Weight2");

	compiler.add_node(NODE_MIX_CLOSURE,
		compiler.encode_uchar4(
			compiler.stack_assign(fac_in),
			compiler.stack_assign(weight_in),
			compiler.stack_assign(weight1_out),
			compiler.stack_assign(weight2_out)));
}

void MixClosureWeightNode::compile(OSLCompiler& /*compiler*/)
{
	assert(0);
}

/* Invert */

NODE_DEFINE(InvertNode)
{
	NodeType* type = NodeType::add("invert", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(fac, "Fac", 1.0f);
	SOCKET_IN_COLOR(color, "Color", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

InvertNode::InvertNode()
: ShaderNode(node_type)
{
}

void InvertNode::constant_fold(const ConstantFolder& folder)
{
	ShaderInput *fac_in = input("Fac");
	ShaderInput *color_in = input("Color");

	if(!fac_in->link) {
		/* evaluate fully constant node */
		if(!color_in->link) {
			folder.make_constant(interp(color, make_float3(1.0f, 1.0f, 1.0f) - color, fac));
		}
		/* remove no-op node */
		else if(fac == 0.0f) {
			folder.bypass(color_in->link);
		}
	}
}

void InvertNode::compile(SVMCompiler& compiler)
{
	ShaderInput *fac_in = input("Fac");
	ShaderInput *color_in = input("Color");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_INVERT,
		compiler.stack_assign(fac_in),
		compiler.stack_assign(color_in),
		compiler.stack_assign(color_out));
}

void InvertNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_invert");
}

/* Mix */

NODE_DEFINE(MixNode)
{
	NodeType* type = NodeType::add("mix", create, NodeType::SHADER);

	static NodeEnum type_enum;
	type_enum.insert("mix", NODE_MIX_BLEND);
	type_enum.insert("add", NODE_MIX_ADD);
	type_enum.insert("multiply", NODE_MIX_MUL);
	type_enum.insert("screen", NODE_MIX_SCREEN);
	type_enum.insert("overlay", NODE_MIX_OVERLAY);
	type_enum.insert("subtract", NODE_MIX_SUB);
	type_enum.insert("divide", NODE_MIX_DIV);
	type_enum.insert("difference", NODE_MIX_DIFF);
	type_enum.insert("darken", NODE_MIX_DARK);
	type_enum.insert("lighten", NODE_MIX_LIGHT);
	type_enum.insert("dodge", NODE_MIX_DODGE);
	type_enum.insert("burn", NODE_MIX_BURN);
	type_enum.insert("hue", NODE_MIX_HUE);
	type_enum.insert("saturation", NODE_MIX_SAT);
	type_enum.insert("value", NODE_MIX_VAL);
	type_enum.insert("color", NODE_MIX_COLOR);
	type_enum.insert("soft_light", NODE_MIX_SOFT);
	type_enum.insert("linear_light", NODE_MIX_LINEAR);
	SOCKET_ENUM(type, "Type", type_enum, NODE_MIX_BLEND);

	SOCKET_BOOLEAN(use_clamp, "Use Clamp", false);

	SOCKET_IN_FLOAT(fac, "Fac", 0.5f);
	SOCKET_IN_COLOR(color1, "Color1", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_COLOR(color2, "Color2", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

MixNode::MixNode()
: ShaderNode(node_type)
{
}

void MixNode::compile(SVMCompiler& compiler)
{
	ShaderInput *fac_in = input("Fac");
	ShaderInput *color1_in = input("Color1");
	ShaderInput *color2_in = input("Color2");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_MIX,
		compiler.stack_assign(fac_in),
		compiler.stack_assign(color1_in),
		compiler.stack_assign(color2_in));
	compiler.add_node(NODE_MIX, type, compiler.stack_assign(color_out));

	if(use_clamp) {
		compiler.add_node(NODE_MIX, 0, compiler.stack_assign(color_out));
		compiler.add_node(NODE_MIX, NODE_MIX_CLAMP, compiler.stack_assign(color_out));
	}
}

void MixNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "type");
	compiler.parameter(this, "use_clamp");
	compiler.add(this, "node_mix");
}

void MixNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant_clamp(svm_mix(type, fac, color1, color2), use_clamp);
	}
	else {
		folder.fold_mix(type, use_clamp);
	}
}

/* Combine RGB */

NODE_DEFINE(CombineRGBNode)
{
	NodeType* type = NodeType::add("combine_rgb", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(r, "R", 0.0f);
	SOCKET_IN_FLOAT(g, "G", 0.0f);
	SOCKET_IN_FLOAT(b, "B", 0.0f);

	SOCKET_OUT_COLOR(image, "Image");

	return type;
}

CombineRGBNode::CombineRGBNode()
: ShaderNode(node_type)
{
}

void CombineRGBNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant(make_float3(r, g, b));
	}
}

void CombineRGBNode::compile(SVMCompiler& compiler)
{
	ShaderInput *red_in = input("R");
	ShaderInput *green_in = input("G");
	ShaderInput *blue_in = input("B");
	ShaderOutput *color_out = output("Image");

	compiler.add_node(NODE_COMBINE_VECTOR,
		compiler.stack_assign(red_in), 0,
		compiler.stack_assign(color_out));

	compiler.add_node(NODE_COMBINE_VECTOR,
		compiler.stack_assign(green_in), 1,
		compiler.stack_assign(color_out));

	compiler.add_node(NODE_COMBINE_VECTOR,
		compiler.stack_assign(blue_in), 2,
		compiler.stack_assign(color_out));
}

void CombineRGBNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_combine_rgb");
}

/* Combine XYZ */

NODE_DEFINE(CombineXYZNode)
{
	NodeType* type = NodeType::add("combine_xyz", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(x, "X", 0.0f);
	SOCKET_IN_FLOAT(y, "Y", 0.0f);
	SOCKET_IN_FLOAT(z, "Z", 0.0f);

	SOCKET_OUT_VECTOR(vector, "Vector");

	return type;
}

CombineXYZNode::CombineXYZNode()
: ShaderNode(node_type)
{
}

void CombineXYZNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant(make_float3(x, y, z));
	}
}

void CombineXYZNode::compile(SVMCompiler& compiler)
{
	ShaderInput *x_in = input("X");
	ShaderInput *y_in = input("Y");
	ShaderInput *z_in = input("Z");
	ShaderOutput *vector_out = output("Vector");

	compiler.add_node(NODE_COMBINE_VECTOR,
		compiler.stack_assign(x_in), 0,
		compiler.stack_assign(vector_out));

	compiler.add_node(NODE_COMBINE_VECTOR,
		compiler.stack_assign(y_in), 1,
		compiler.stack_assign(vector_out));

	compiler.add_node(NODE_COMBINE_VECTOR,
		compiler.stack_assign(z_in), 2,
		compiler.stack_assign(vector_out));
}

void CombineXYZNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_combine_xyz");
}

/* Combine HSV */

NODE_DEFINE(CombineHSVNode)
{
	NodeType* type = NodeType::add("combine_hsv", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(h, "H", 0.0f);
	SOCKET_IN_FLOAT(s, "S", 0.0f);
	SOCKET_IN_FLOAT(v, "V", 0.0f);

	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

CombineHSVNode::CombineHSVNode()
: ShaderNode(node_type)
{
}

void CombineHSVNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant(hsv_to_rgb(make_float3(h, s, v)));
	}
}

void CombineHSVNode::compile(SVMCompiler& compiler)
{
	ShaderInput *hue_in = input("H");
	ShaderInput *saturation_in = input("S");
	ShaderInput *value_in = input("V");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_COMBINE_HSV,
		compiler.stack_assign(hue_in),
		compiler.stack_assign(saturation_in),
		compiler.stack_assign(value_in));
	compiler.add_node(NODE_COMBINE_HSV,
		compiler.stack_assign(color_out));
}

void CombineHSVNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_combine_hsv");
}

/* Gamma */

NODE_DEFINE(GammaNode)
{
	NodeType* type = NodeType::add("gamma", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_FLOAT(gamma, "Gamma", 1.0f);
	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

GammaNode::GammaNode()
: ShaderNode(node_type)
{
}

void GammaNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant(svm_math_gamma_color(color, gamma));
	}
	else {
		ShaderInput *color_in = input("Color");
		ShaderInput *gamma_in = input("Gamma");

		/* 1 ^ X == X ^ 0 == 1 */
		if(folder.is_one(color_in) || folder.is_zero(gamma_in)) {
			folder.make_one();
		}
		/* X ^ 1 == X */
		else if(folder.is_one(gamma_in)) {
			folder.try_bypass_or_make_constant(color_in, false);
		}
	}
}

void GammaNode::compile(SVMCompiler& compiler)
{
	ShaderInput *color_in = input("Color");
	ShaderInput *gamma_in = input("Gamma");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_GAMMA,
		compiler.stack_assign(gamma_in),
		compiler.stack_assign(color_in),
		compiler.stack_assign(color_out));
}

void GammaNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_gamma");
}

/* Bright Contrast */

NODE_DEFINE(BrightContrastNode)
{
	NodeType* type = NodeType::add("brightness_contrast", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_FLOAT(bright, "Bright", 0.0f);
	SOCKET_IN_FLOAT(contrast, "Contrast", 0.0f);

	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

BrightContrastNode::BrightContrastNode()
: ShaderNode(node_type)
{
}

void BrightContrastNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant(svm_brightness_contrast(color, bright, contrast));
	}
}

void BrightContrastNode::compile(SVMCompiler& compiler)
{
	ShaderInput *color_in = input("Color");
	ShaderInput *bright_in = input("Bright");
	ShaderInput *contrast_in = input("Contrast");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_BRIGHTCONTRAST,
		compiler.stack_assign(color_in),
		compiler.stack_assign(color_out),
		compiler.encode_uchar4(
			compiler.stack_assign(bright_in),
			compiler.stack_assign(contrast_in)));
}

void BrightContrastNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_brightness");
}

/* Separate RGB */

NODE_DEFINE(SeparateRGBNode)
{
	NodeType* type = NodeType::add("separate_rgb", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Image", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_FLOAT(r, "R");
	SOCKET_OUT_FLOAT(g, "G");
	SOCKET_OUT_FLOAT(b, "B");

	return type;
}

SeparateRGBNode::SeparateRGBNode()
: ShaderNode(node_type)
{
}

void SeparateRGBNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		for(int channel = 0; channel < 3; channel++) {
			if(outputs[channel] == folder.output) {
				folder.make_constant(color[channel]);
				return;
			}
		}
	}
}

void SeparateRGBNode::compile(SVMCompiler& compiler)
{
	ShaderInput *color_in = input("Image");
	ShaderOutput *red_out = output("R");
	ShaderOutput *green_out = output("G");
	ShaderOutput *blue_out = output("B");

	compiler.add_node(NODE_SEPARATE_VECTOR,
		compiler.stack_assign(color_in), 0,
		compiler.stack_assign(red_out));

	compiler.add_node(NODE_SEPARATE_VECTOR,
		compiler.stack_assign(color_in), 1,
		compiler.stack_assign(green_out));

	compiler.add_node(NODE_SEPARATE_VECTOR,
		compiler.stack_assign(color_in), 2,
		compiler.stack_assign(blue_out));
}

void SeparateRGBNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_separate_rgb");
}

/* Separate XYZ */

NODE_DEFINE(SeparateXYZNode)
{
	NodeType* type = NodeType::add("separate_xyz", create, NodeType::SHADER);

	SOCKET_IN_COLOR(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_FLOAT(x, "X");
	SOCKET_OUT_FLOAT(y, "Y");
	SOCKET_OUT_FLOAT(z, "Z");

	return type;
}

SeparateXYZNode::SeparateXYZNode()
: ShaderNode(node_type)
{
}

void SeparateXYZNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		for(int channel = 0; channel < 3; channel++) {
			if(outputs[channel] == folder.output) {
				folder.make_constant(vector[channel]);
				return;
			}
		}
	}
}

void SeparateXYZNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *x_out = output("X");
	ShaderOutput *y_out = output("Y");
	ShaderOutput *z_out = output("Z");

	compiler.add_node(NODE_SEPARATE_VECTOR,
		compiler.stack_assign(vector_in), 0,
		compiler.stack_assign(x_out));

	compiler.add_node(NODE_SEPARATE_VECTOR,
		compiler.stack_assign(vector_in), 1,
		compiler.stack_assign(y_out));

	compiler.add_node(NODE_SEPARATE_VECTOR,
		compiler.stack_assign(vector_in), 2,
		compiler.stack_assign(z_out));
}

void SeparateXYZNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_separate_xyz");
}

/* Separate HSV */

NODE_DEFINE(SeparateHSVNode)
{
	NodeType* type = NodeType::add("separate_hsv", create, NodeType::SHADER);

	SOCKET_IN_COLOR(color, "Color", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_FLOAT(h, "H");
	SOCKET_OUT_FLOAT(s, "S");
	SOCKET_OUT_FLOAT(v, "V");

	return type;
}

SeparateHSVNode::SeparateHSVNode()
: ShaderNode(node_type)
{
}

void SeparateHSVNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		float3 hsv = rgb_to_hsv(color);

		for(int channel = 0; channel < 3; channel++) {
			if(outputs[channel] == folder.output) {
				folder.make_constant(hsv[channel]);
				return;
			}
		}
	}
}

void SeparateHSVNode::compile(SVMCompiler& compiler)
{
	ShaderInput *color_in = input("Color");
	ShaderOutput *hue_out = output("H");
	ShaderOutput *saturation_out = output("S");
	ShaderOutput *value_out = output("V");

	compiler.add_node(NODE_SEPARATE_HSV,
		compiler.stack_assign(color_in),
		compiler.stack_assign(hue_out),
		compiler.stack_assign(saturation_out));
	compiler.add_node(NODE_SEPARATE_HSV,
		compiler.stack_assign(value_out));
}

void SeparateHSVNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_separate_hsv");
}

/* Hue Saturation Value */

NODE_DEFINE(HSVNode)
{
	NodeType* type = NodeType::add("hsv", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(hue, "Hue", 0.5f);
	SOCKET_IN_FLOAT(saturation, "Saturation", 1.0f);
	SOCKET_IN_FLOAT(value, "Value", 1.0f);
	SOCKET_IN_FLOAT(fac, "Fac", 1.0f);
	SOCKET_IN_COLOR(color, "Color", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

HSVNode::HSVNode()
: ShaderNode(node_type)
{
}

void HSVNode::compile(SVMCompiler& compiler)
{
	ShaderInput *hue_in = input("Hue");
	ShaderInput *saturation_in = input("Saturation");
	ShaderInput *value_in = input("Value");
	ShaderInput *fac_in = input("Fac");
	ShaderInput *color_in = input("Color");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_HSV,
		compiler.encode_uchar4(
			compiler.stack_assign(color_in),
			compiler.stack_assign(fac_in),
			compiler.stack_assign(color_out)),
		compiler.encode_uchar4(
			compiler.stack_assign(hue_in),
			compiler.stack_assign(saturation_in),
			compiler.stack_assign(value_in)));
}

void HSVNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_hsv");
}

/* Attribute */

NODE_DEFINE(AttributeNode)
{
	NodeType* type = NodeType::add("attribute", create, NodeType::SHADER);

	SOCKET_STRING(attribute, "Attribute", ustring(""));

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_VECTOR(vector, "Vector");
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

AttributeNode::AttributeNode()
: ShaderNode(node_type)
{
}

void AttributeNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	ShaderOutput *color_out = output("Color");
	ShaderOutput *vector_out = output("Vector");
	ShaderOutput *fac_out = output("Fac");

	if(!color_out->links.empty() || !vector_out->links.empty() || !fac_out->links.empty()) {
		AttributeStandard std = Attribute::name_standard(attribute.c_str());

		if(std != ATTR_STD_NONE)
			attributes->add(std);
		else
			attributes->add(attribute);
	}

	if(shader->has_volume)
		attributes->add(ATTR_STD_GENERATED_TRANSFORM);

	ShaderNode::attributes(shader, attributes);
}

void AttributeNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *color_out = output("Color");
	ShaderOutput *vector_out = output("Vector");
	ShaderOutput *fac_out = output("Fac");
	ShaderNodeType attr_node = NODE_ATTR;
	AttributeStandard std = Attribute::name_standard(attribute.c_str());
	int attr;

	if(std != ATTR_STD_NONE)
		attr = compiler.attribute(std);
	else
		attr = compiler.attribute(attribute);

	if(bump == SHADER_BUMP_DX)
		attr_node = NODE_ATTR_BUMP_DX;
	else if(bump == SHADER_BUMP_DY)
		attr_node = NODE_ATTR_BUMP_DY;

	if(!color_out->links.empty() || !vector_out->links.empty()) {
		if(!color_out->links.empty()) {
			compiler.add_node(attr_node, attr, compiler.stack_assign(color_out), NODE_ATTR_FLOAT3);
		}
		if(!vector_out->links.empty()) {
			compiler.add_node(attr_node, attr, compiler.stack_assign(vector_out), NODE_ATTR_FLOAT3);
		}
	}

	if(!fac_out->links.empty()) {
		compiler.add_node(attr_node, attr, compiler.stack_assign(fac_out), NODE_ATTR_FLOAT);
	}
}

void AttributeNode::compile(OSLCompiler& compiler)
{
	if(bump == SHADER_BUMP_DX)
		compiler.parameter("bump_offset", "dx");
	else if(bump == SHADER_BUMP_DY)
		compiler.parameter("bump_offset", "dy");
	else
		compiler.parameter("bump_offset", "center");
	
	if(Attribute::name_standard(attribute.c_str()) != ATTR_STD_NONE)
		compiler.parameter("name", (string("geom:") + attribute.c_str()).c_str());
	else
		compiler.parameter("name", attribute.c_str());

	compiler.add(this, "node_attribute");
}

/* Camera */

NODE_DEFINE(CameraNode)
{
	NodeType* type = NodeType::add("camera_info", create, NodeType::SHADER);

	SOCKET_OUT_VECTOR(view_vector, "View Vector");
	SOCKET_OUT_FLOAT(view_z_depth, "View Z Depth");
	SOCKET_OUT_FLOAT(view_distance, "View Distance");

	return type;
}

CameraNode::CameraNode()
: ShaderNode(node_type)
{
}

void CameraNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *vector_out = output("View Vector");
	ShaderOutput *z_depth_out = output("View Z Depth");
	ShaderOutput *distance_out = output("View Distance");

	compiler.add_node(NODE_CAMERA,
		compiler.stack_assign(vector_out),
		compiler.stack_assign(z_depth_out),
		compiler.stack_assign(distance_out));
}

void CameraNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_camera");
}

/* Fresnel */

NODE_DEFINE(FresnelNode)
{
	NodeType* type = NodeType::add("fresnel", create, NodeType::SHADER);

	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL | SocketType::OSL_INTERNAL);
	SOCKET_IN_FLOAT(IOR, "IOR", 1.45f);

	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

FresnelNode::FresnelNode()
: ShaderNode(node_type)
{
}

void FresnelNode::compile(SVMCompiler& compiler)
{
	ShaderInput *normal_in = input("Normal");
	ShaderInput *IOR_in = input("IOR");
	ShaderOutput *fac_out = output("Fac");

	compiler.add_node(NODE_FRESNEL,
		compiler.stack_assign(IOR_in),
		__float_as_int(IOR),
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(normal_in),
			compiler.stack_assign(fac_out)));
}

void FresnelNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_fresnel");
}

/* Layer Weight */

NODE_DEFINE(LayerWeightNode)
{
	NodeType* type = NodeType::add("layer_weight", create, NodeType::SHADER);

	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL | SocketType::OSL_INTERNAL);
	SOCKET_IN_FLOAT(blend, "Blend", 0.5f);

	SOCKET_OUT_FLOAT(fresnel, "Fresnel");
	SOCKET_OUT_FLOAT(facing, "Facing");

	return type;
}

LayerWeightNode::LayerWeightNode()
: ShaderNode(node_type)
{
}

void LayerWeightNode::compile(SVMCompiler& compiler)
{
	ShaderInput *normal_in = input("Normal");
	ShaderInput *blend_in = input("Blend");
	ShaderOutput *fresnel_out = output("Fresnel");
	ShaderOutput *facing_out = output("Facing");

	if(!fresnel_out->links.empty()) {
		compiler.add_node(NODE_LAYER_WEIGHT,
			compiler.stack_assign_if_linked(blend_in),
			__float_as_int(blend),
			compiler.encode_uchar4(NODE_LAYER_WEIGHT_FRESNEL,
			                       compiler.stack_assign_if_linked(normal_in),
			                       compiler.stack_assign(fresnel_out)));
	}

	if(!facing_out->links.empty()) {
		compiler.add_node(NODE_LAYER_WEIGHT,
			compiler.stack_assign_if_linked(blend_in),
			__float_as_int(blend),
			compiler.encode_uchar4(NODE_LAYER_WEIGHT_FACING,
			                       compiler.stack_assign_if_linked(normal_in),
			                       compiler.stack_assign(facing_out)));
	}
}

void LayerWeightNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_layer_weight");
}

/* Wireframe */

NODE_DEFINE(WireframeNode)
{
	NodeType* type = NodeType::add("wireframe", create, NodeType::SHADER);

	SOCKET_BOOLEAN(use_pixel_size, "Use Pixel Size", false);
	SOCKET_IN_FLOAT(size, "Size", 0.01f);
	SOCKET_OUT_FLOAT(fac, "Fac");

	return type;
}

WireframeNode::WireframeNode()
: ShaderNode(node_type)
{
}

void WireframeNode::compile(SVMCompiler& compiler)
{
	ShaderInput *size_in = input("Size");
	ShaderOutput *fac_out = output("Fac");
	NodeBumpOffset bump_offset = NODE_BUMP_OFFSET_CENTER;
	if(bump == SHADER_BUMP_DX) {
		bump_offset = NODE_BUMP_OFFSET_DX;
	}
	else if(bump == SHADER_BUMP_DY) {
		bump_offset = NODE_BUMP_OFFSET_DY;
	}
	compiler.add_node(NODE_WIREFRAME,
	                  compiler.stack_assign(size_in),
	                  compiler.stack_assign(fac_out),
	                  compiler.encode_uchar4(use_pixel_size,
	                                         bump_offset,
	                                         0, 0));
}

void WireframeNode::compile(OSLCompiler& compiler)
{
	if(bump == SHADER_BUMP_DX) {
		compiler.parameter("bump_offset", "dx");
	}
	else if(bump == SHADER_BUMP_DY) {
		compiler.parameter("bump_offset", "dy");
	}
	else {
		compiler.parameter("bump_offset", "center");
	}
	compiler.parameter(this, "use_pixel_size");
	compiler.add(this, "node_wireframe");
}

/* Wavelength */

NODE_DEFINE(WavelengthNode)
{
	NodeType* type = NodeType::add("wavelength", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(wavelength, "Wavelength", 500.0f);
	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

WavelengthNode::WavelengthNode()
: ShaderNode(node_type)
{
}

void WavelengthNode::compile(SVMCompiler& compiler)
{
	ShaderInput *wavelength_in = input("Wavelength");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_WAVELENGTH,
		compiler.stack_assign(wavelength_in),
		compiler.stack_assign(color_out));
}

void WavelengthNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_wavelength");
}

/* Blackbody */

NODE_DEFINE(BlackbodyNode)
{
	NodeType* type = NodeType::add("blackbody", create, NodeType::SHADER);

	SOCKET_IN_FLOAT(temperature, "Temperature", 1200.0f);
	SOCKET_OUT_COLOR(color, "Color");

	return type;
}

BlackbodyNode::BlackbodyNode()
: ShaderNode(node_type)
{
}

void BlackbodyNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant(svm_math_blackbody_color(temperature));
	}
}

void BlackbodyNode::compile(SVMCompiler& compiler)
{
	ShaderInput *temperature_in = input("Temperature");
	ShaderOutput *color_out = output("Color");

	compiler.add_node(NODE_BLACKBODY,
		compiler.stack_assign(temperature_in),
		compiler.stack_assign(color_out));
}

void BlackbodyNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_blackbody");
}

/* Output */

NODE_DEFINE(OutputNode)
{
	NodeType* type = NodeType::add("output", create, NodeType::SHADER);

	SOCKET_IN_CLOSURE(surface, "Surface");
	SOCKET_IN_CLOSURE(volume, "Volume");
	SOCKET_IN_FLOAT(displacement, "Displacement", 0.0f);
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f));

	return type;
}

OutputNode::OutputNode()
: ShaderNode(node_type)
{
	special_type = SHADER_SPECIAL_TYPE_OUTPUT;
}

void OutputNode::compile(SVMCompiler& compiler)
{
	if(compiler.output_type() == SHADER_TYPE_DISPLACEMENT) {
		ShaderInput *displacement_in = input("Displacement");

		if(displacement_in->link) {
			compiler.add_node(NODE_SET_DISPLACEMENT, compiler.stack_assign(displacement_in));
		}
	}
}

void OutputNode::compile(OSLCompiler& compiler)
{
	if(compiler.output_type() == SHADER_TYPE_SURFACE)
		compiler.add(this, "node_output_surface");
	else if(compiler.output_type() == SHADER_TYPE_VOLUME)
		compiler.add(this, "node_output_volume");
	else if(compiler.output_type() == SHADER_TYPE_DISPLACEMENT)
		compiler.add(this, "node_output_displacement");
}

/* Math */

NODE_DEFINE(MathNode)
{
	NodeType* type = NodeType::add("math", create, NodeType::SHADER);

	static NodeEnum type_enum;
	type_enum.insert("add", NODE_MATH_ADD);
	type_enum.insert("subtract", NODE_MATH_SUBTRACT);
	type_enum.insert("multiply", NODE_MATH_MULTIPLY);
	type_enum.insert("divide", NODE_MATH_DIVIDE);
	type_enum.insert("sine", NODE_MATH_SINE);
	type_enum.insert("cosine", NODE_MATH_COSINE);
	type_enum.insert("tangent", NODE_MATH_TANGENT);
	type_enum.insert("arcsine", NODE_MATH_ARCSINE);
	type_enum.insert("arccosine", NODE_MATH_ARCCOSINE);
	type_enum.insert("arctangent", NODE_MATH_ARCTANGENT);
	type_enum.insert("power", NODE_MATH_POWER);
	type_enum.insert("logarithm", NODE_MATH_LOGARITHM);
	type_enum.insert("minimum", NODE_MATH_MINIMUM);
	type_enum.insert("maximum", NODE_MATH_MAXIMUM);
	type_enum.insert("round", NODE_MATH_ROUND);
	type_enum.insert("less_than", NODE_MATH_LESS_THAN);
	type_enum.insert("greater_than", NODE_MATH_GREATER_THAN);
	type_enum.insert("modulo", NODE_MATH_MODULO);
	type_enum.insert("absolute", NODE_MATH_ABSOLUTE);
	SOCKET_ENUM(type, "Type", type_enum, NODE_MATH_ADD);

	SOCKET_BOOLEAN(use_clamp, "Use Clamp", false);

	SOCKET_IN_FLOAT(value1, "Value1", 0.0f);
	SOCKET_IN_FLOAT(value2, "Value2", 0.0f);

	SOCKET_OUT_FLOAT(value, "Value");

	return type;
}

MathNode::MathNode()
: ShaderNode(node_type)
{
}

void MathNode::constant_fold(const ConstantFolder& folder)
{
	if(folder.all_inputs_constant()) {
		folder.make_constant_clamp(svm_math(type, value1, value2), use_clamp);
	}
	else {
		folder.fold_math(type, use_clamp);
	}
}

void MathNode::compile(SVMCompiler& compiler)
{
	ShaderInput *value1_in = input("Value1");
	ShaderInput *value2_in = input("Value2");
	ShaderOutput *value_out = output("Value");

	compiler.add_node(NODE_MATH, type, compiler.stack_assign(value1_in), compiler.stack_assign(value2_in));
	compiler.add_node(NODE_MATH, compiler.stack_assign(value_out));

	if(use_clamp) {
		compiler.add_node(NODE_MATH, NODE_MATH_CLAMP, compiler.stack_assign(value_out));
		compiler.add_node(NODE_MATH, compiler.stack_assign(value_out));
	}
}

void MathNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "type");
	compiler.parameter(this, "use_clamp");
	compiler.add(this, "node_math");
}

/* VectorMath */

NODE_DEFINE(VectorMathNode)
{
	NodeType* type = NodeType::add("vector_math", create, NodeType::SHADER);

	static NodeEnum type_enum;
	type_enum.insert("add", NODE_VECTOR_MATH_ADD);
	type_enum.insert("subtract", NODE_VECTOR_MATH_SUBTRACT);
	type_enum.insert("average", NODE_VECTOR_MATH_AVERAGE);
	type_enum.insert("dot_product", NODE_VECTOR_MATH_DOT_PRODUCT);
	type_enum.insert("cross_product", NODE_VECTOR_MATH_CROSS_PRODUCT);
	type_enum.insert("normalize", NODE_VECTOR_MATH_NORMALIZE);
	SOCKET_ENUM(type, "Type", type_enum, NODE_VECTOR_MATH_ADD);

	SOCKET_IN_VECTOR(vector1, "Vector1", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_IN_VECTOR(vector2, "Vector2", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_FLOAT(value, "Value");
	SOCKET_OUT_VECTOR(vector, "Vector");

	return type;
}

VectorMathNode::VectorMathNode()
: ShaderNode(node_type)
{
}

void VectorMathNode::constant_fold(const ConstantFolder& folder)
{
	float value;
	float3 vector;

	if(folder.all_inputs_constant()) {
		svm_vector_math(&value,
		                &vector,
		                type,
		                vector1,
		                vector2);

		if(folder.output == output("Value")) {
			folder.make_constant(value);
		}
		else if(folder.output == output("Vector")) {
			folder.make_constant(vector);
		}
	}
	else {
		folder.fold_vector_math(type);
	}
}

void VectorMathNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector1_in = input("Vector1");
	ShaderInput *vector2_in = input("Vector2");
	ShaderOutput *value_out = output("Value");
	ShaderOutput *vector_out = output("Vector");

	compiler.add_node(NODE_VECTOR_MATH,
		type,
		compiler.stack_assign(vector1_in),
		compiler.stack_assign(vector2_in));
	compiler.add_node(NODE_VECTOR_MATH,
		compiler.stack_assign(value_out),
		compiler.stack_assign(vector_out));
}

void VectorMathNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "type");
	compiler.add(this, "node_vector_math");
}

/* VectorTransform */

NODE_DEFINE(VectorTransformNode)
{
	NodeType* type = NodeType::add("vector_transform", create, NodeType::SHADER);

	static NodeEnum type_enum;
	type_enum.insert("vector", NODE_VECTOR_TRANSFORM_TYPE_VECTOR);
	type_enum.insert("point", NODE_VECTOR_TRANSFORM_TYPE_POINT);
	type_enum.insert("normal", NODE_VECTOR_TRANSFORM_TYPE_NORMAL);
	SOCKET_ENUM(type, "Type", type_enum, NODE_VECTOR_TRANSFORM_TYPE_VECTOR);

	static NodeEnum space_enum;
	space_enum.insert("world", NODE_VECTOR_TRANSFORM_CONVERT_SPACE_WORLD);
	space_enum.insert("object", NODE_VECTOR_TRANSFORM_CONVERT_SPACE_OBJECT);
	space_enum.insert("camera", NODE_VECTOR_TRANSFORM_CONVERT_SPACE_CAMERA);
	SOCKET_ENUM(convert_from, "Convert From", space_enum, NODE_VECTOR_TRANSFORM_CONVERT_SPACE_WORLD);
	SOCKET_ENUM(convert_to, "Convert To", space_enum, NODE_VECTOR_TRANSFORM_CONVERT_SPACE_OBJECT);

	SOCKET_IN_VECTOR(vector, "Vector", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_OUT_VECTOR(vector, "Vector");

	return type;
}

VectorTransformNode::VectorTransformNode()
: ShaderNode(node_type)
{
}

void VectorTransformNode::compile(SVMCompiler& compiler)
{
	ShaderInput *vector_in = input("Vector");
	ShaderOutput *vector_out = output("Vector");

	compiler.add_node(NODE_VECTOR_TRANSFORM,
		compiler.encode_uchar4(type, convert_from, convert_to),
		compiler.encode_uchar4(compiler.stack_assign(vector_in),
		                       compiler.stack_assign(vector_out)));
}

void VectorTransformNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "type");
	compiler.parameter(this, "convert_from");
	compiler.parameter(this, "convert_to");
	compiler.add(this, "node_vector_transform");
}

/* BumpNode */

NODE_DEFINE(BumpNode)
{
	NodeType* type = NodeType::add("bump", create, NodeType::SHADER);

	SOCKET_BOOLEAN(invert, "Invert", false);
	SOCKET_BOOLEAN(use_object_space, "UseObjectSpace", false);

	/* this input is used by the user, but after graph transform it is no longer
	 * used and moved to sampler center/x/y instead */
	SOCKET_IN_FLOAT(height, "Height", 1.0f);

	SOCKET_IN_FLOAT(sample_center, "SampleCenter", 0.0f);
	SOCKET_IN_FLOAT(sample_x, "SampleX", 0.0f);
	SOCKET_IN_FLOAT(sample_y, "SampleY", 0.0f);
	SOCKET_IN_NORMAL(normal, "Normal", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL);
	SOCKET_IN_FLOAT(strength, "Strength", 1.0f);
	SOCKET_IN_FLOAT(distance, "Distance", 0.1f);

	SOCKET_OUT_NORMAL(normal, "Normal");

	return type;
}

BumpNode::BumpNode()
: ShaderNode(node_type)
{
	special_type = SHADER_SPECIAL_TYPE_BUMP;
}

void BumpNode::compile(SVMCompiler& compiler)
{
	ShaderInput *center_in = input("SampleCenter");
	ShaderInput *dx_in = input("SampleX");
	ShaderInput *dy_in = input("SampleY");
	ShaderInput *normal_in = input("Normal");
	ShaderInput *strength_in = input("Strength");
	ShaderInput *distance_in = input("Distance");
	ShaderOutput *normal_out = output("Normal");

	/* pack all parameters in the node */
	compiler.add_node(NODE_SET_BUMP,
		compiler.encode_uchar4(
			compiler.stack_assign_if_linked(normal_in),
			compiler.stack_assign(distance_in),
			invert,
			use_object_space),
		compiler.encode_uchar4(
			compiler.stack_assign(center_in),
			compiler.stack_assign(dx_in),
			compiler.stack_assign(dy_in),
			compiler.stack_assign(strength_in)),
		compiler.stack_assign(normal_out));
}

void BumpNode::compile(OSLCompiler& compiler)
{
	compiler.parameter(this, "invert");
	compiler.parameter(this, "use_object_space");
	compiler.add(this, "node_bump");
}

void BumpNode::constant_fold(const ConstantFolder& folder)
{
	ShaderInput *height_in = input("Height");
	ShaderInput *normal_in = input("Normal");

	if(height_in->link == NULL) {
		if(normal_in->link == NULL) {
			GeometryNode *geom = new GeometryNode();
			folder.graph->add(geom);
			folder.bypass(geom->output("Normal"));
		}
		else {
			folder.bypass(normal_in->link);
		}
	}

	/* TODO(sergey): Ignore bump with zero strength. */
}


/* Curve node */

CurvesNode::CurvesNode(const NodeType *node_type)
: ShaderNode(node_type)
{
}

void CurvesNode::constant_fold(const ConstantFolder& folder, ShaderInput *value_in)
{
	ShaderInput *fac_in = input("Fac");

	/* evaluate fully constant node */
	if(folder.all_inputs_constant()) {
		if(curves.size() == 0) {
			return;
		}

		float3 pos = (value - make_float3(min_x, min_x, min_x)) / (max_x - min_x);
		float3 result;

		result[0] = rgb_ramp_lookup(curves.data(), pos[0], true, true, curves.size()).x;
		result[1] = rgb_ramp_lookup(curves.data(), pos[1], true, true, curves.size()).y;
		result[2] = rgb_ramp_lookup(curves.data(), pos[2], true, true, curves.size()).z;

		folder.make_constant(interp(value, result, fac));
	}
	/* remove no-op node */
	else if(!fac_in->link && fac == 0.0f) {
		/* link is not null because otherwise all inputs are constant */
		folder.bypass(value_in->link);
	}
}

void CurvesNode::compile(SVMCompiler& compiler, int type, ShaderInput *value_in, ShaderOutput *value_out)
{
	if(curves.size() == 0)
		return;

	ShaderInput *fac_in = input("Fac");

	compiler.add_node(type,
	                  compiler.encode_uchar4(compiler.stack_assign(fac_in),
	                                         compiler.stack_assign(value_in),
	                                         compiler.stack_assign(value_out)),
	                  __float_as_int(min_x),
	                  __float_as_int(max_x));

	compiler.add_node(curves.size());
	for(int i = 0; i < curves.size(); i++)
		compiler.add_node(float3_to_float4(curves[i]));
}

void CurvesNode::compile(OSLCompiler& compiler, const char* name)
{
	if(curves.size() == 0)
		return;

	compiler.parameter_color_array("ramp", curves);
	compiler.parameter(this, "min_x");
	compiler.parameter(this, "max_x");
	compiler.add(this, name);
}

void CurvesNode::compile(SVMCompiler& /*compiler*/)
{
	assert(0);
}

void CurvesNode::compile(OSLCompiler& /*compiler*/)
{
	assert(0);
}

/* RGBCurvesNode */

NODE_DEFINE(RGBCurvesNode)
{
	NodeType* type = NodeType::add("rgb_curves", create, NodeType::SHADER);

	SOCKET_COLOR_ARRAY(curves, "Curves", array<float3>());
	SOCKET_FLOAT(min_x, "Min X", 0.0f);
	SOCKET_FLOAT(max_x, "Max X", 1.0f);

	SOCKET_IN_FLOAT(fac, "Fac", 0.0f);
	SOCKET_IN_COLOR(value, "Color", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_COLOR(value, "Color");

	return type;
}

RGBCurvesNode::RGBCurvesNode()
: CurvesNode(node_type)
{
}

void RGBCurvesNode::constant_fold(const ConstantFolder& folder)
{
	CurvesNode::constant_fold(folder, input("Color"));
}

void RGBCurvesNode::compile(SVMCompiler& compiler)
{
	CurvesNode::compile(compiler, NODE_RGB_CURVES, input("Color"), output("Color"));
}

void RGBCurvesNode::compile(OSLCompiler& compiler)
{
	CurvesNode::compile(compiler, "node_rgb_curves");
}

/* VectorCurvesNode */

NODE_DEFINE(VectorCurvesNode)
{
	NodeType* type = NodeType::add("vector_curves", create, NodeType::SHADER);

	SOCKET_VECTOR_ARRAY(curves, "Curves", array<float3>());
	SOCKET_FLOAT(min_x, "Min X", 0.0f);
	SOCKET_FLOAT(max_x, "Max X", 1.0f);

	SOCKET_IN_FLOAT(fac, "Fac", 0.0f);
	SOCKET_IN_VECTOR(value, "Vector", make_float3(0.0f, 0.0f, 0.0f));

	SOCKET_OUT_VECTOR(value, "Vector");

	return type;
}

VectorCurvesNode::VectorCurvesNode()
: CurvesNode(node_type)
{
}

void VectorCurvesNode::constant_fold(const ConstantFolder& folder)
{
	CurvesNode::constant_fold(folder, input("Vector"));
}

void VectorCurvesNode::compile(SVMCompiler& compiler)
{
	CurvesNode::compile(compiler, NODE_VECTOR_CURVES, input("Vector"), output("Vector"));
}

void VectorCurvesNode::compile(OSLCompiler& compiler)
{
	CurvesNode::compile(compiler, "node_vector_curves");
}

/* RGBRampNode */

NODE_DEFINE(RGBRampNode)
{
	NodeType* type = NodeType::add("rgb_ramp", create, NodeType::SHADER);

	SOCKET_COLOR_ARRAY(ramp, "Ramp", array<float3>());
	SOCKET_FLOAT_ARRAY(ramp_alpha, "Ramp Alpha", array<float>());
	SOCKET_BOOLEAN(interpolate, "Interpolate", true);

	SOCKET_IN_FLOAT(fac, "Fac", 0.0f);

	SOCKET_OUT_COLOR(color, "Color");
	SOCKET_OUT_FLOAT(alpha, "Alpha");

	return type;
}

RGBRampNode::RGBRampNode()
: ShaderNode(node_type)
{
}

void RGBRampNode::constant_fold(const ConstantFolder& folder)
{
	if(ramp.size() == 0 || ramp.size() != ramp_alpha.size())
		return;

	if(folder.all_inputs_constant()) {
		float f = clamp(fac, 0.0f, 1.0f) * (ramp.size() - 1);

		/* clamp int as well in case of NaN */
		int i = clamp((int)f, 0, ramp.size()-1);
		float t = f - (float)i;

		bool use_lerp = interpolate && t > 0.0f;

		if(folder.output == output("Color")) {
			float3 color = rgb_ramp_lookup(ramp.data(), fac, use_lerp, false, ramp.size());
			folder.make_constant(color);
		}
		else if(folder.output == output("Alpha")) {
			float alpha = float_ramp_lookup(ramp_alpha.data(), fac, use_lerp, false, ramp_alpha.size());
			folder.make_constant(alpha);
		}
	}
}

void RGBRampNode::compile(SVMCompiler& compiler)
{
	if(ramp.size() == 0 || ramp.size() != ramp_alpha.size())
		return;

	ShaderInput *fac_in = input("Fac");
	ShaderOutput *color_out = output("Color");
	ShaderOutput *alpha_out = output("Alpha");

	compiler.add_node(NODE_RGB_RAMP,
		compiler.encode_uchar4(
			compiler.stack_assign(fac_in),
			compiler.stack_assign_if_linked(color_out),
			compiler.stack_assign_if_linked(alpha_out)),
		interpolate);

	compiler.add_node(ramp.size());
	for(int i = 0; i < ramp.size(); i++)
		compiler.add_node(make_float4(ramp[i].x, ramp[i].y, ramp[i].z, ramp_alpha[i]));
}

void RGBRampNode::compile(OSLCompiler& compiler)
{
	if(ramp.size() == 0 || ramp.size() != ramp_alpha.size())
		return;

	compiler.parameter_color_array("ramp_color", ramp);
	compiler.parameter_array("ramp_alpha", ramp_alpha.data(), ramp_alpha.size());
	compiler.parameter(this, "interpolate");
	
	compiler.add(this, "node_rgb_ramp");
}

/* Set Normal Node */

NODE_DEFINE(SetNormalNode)
{
	NodeType* type = NodeType::add("set_normal", create, NodeType::SHADER);

	SOCKET_IN_VECTOR(direction, "Direction", make_float3(0.0f, 0.0f, 0.0f));
	SOCKET_OUT_NORMAL(normal, "Normal");

	return type;
}

SetNormalNode::SetNormalNode()
: ShaderNode(node_type)
{
}

void SetNormalNode::compile(SVMCompiler& compiler)
{
	ShaderInput  *direction_in = input("Direction");
	ShaderOutput *normal_out = output("Normal");

	compiler.add_node(NODE_CLOSURE_SET_NORMAL,
		compiler.stack_assign(direction_in),
		compiler.stack_assign(normal_out));
}

void SetNormalNode::compile(OSLCompiler& compiler)
{
	compiler.add(this, "node_set_normal"); 
}

/* OSLNode */

OSLNode::OSLNode()
: ShaderNode(new NodeType(NodeType::SHADER))
{
	special_type = SHADER_SPECIAL_TYPE_SCRIPT;
}

OSLNode::~OSLNode()
{
	delete type;
}

ShaderNode *OSLNode::clone() const
{
	return OSLNode::create(this->inputs.size(), this);
}

OSLNode* OSLNode::create(size_t num_inputs, const OSLNode *from)
{
	/* allocate space for the node itself and parameters, aligned to 16 bytes
	 * assuming that's the most parameter types need */
	size_t node_size = align_up(sizeof(OSLNode), 16);
	size_t inputs_size = align_up(SocketType::max_size(), 16) * num_inputs;

	char *node_memory = (char*) operator new(node_size + inputs_size);
	memset(node_memory, 0, node_size + inputs_size);

	if(!from) {
		return new(node_memory) OSLNode();
	}
	else {
		/* copy input default values and node type for cloning */
		memcpy(node_memory + node_size, (char*)from + node_size, inputs_size);

		OSLNode *node = new(node_memory) OSLNode(*from);
		node->type = new NodeType(*(from->type));
		return node;
	}
}

char* OSLNode::input_default_value()
{
	/* pointer to default value storage, which is the same as our actual value */
	size_t num_inputs = type->inputs.size();
	size_t inputs_size = align_up(SocketType::max_size(), 16) * num_inputs;
	return (char*)this + align_up(sizeof(OSLNode), 16) + inputs_size;
}

void OSLNode::add_input(ustring name, SocketType::Type socket_type)
{
    char *memory = input_default_value();
	size_t offset = memory - (char*)this;
	const_cast<NodeType*>(type)->register_input(name, name, socket_type, offset, memory, NULL, NULL, SocketType::LINKABLE);
}

void OSLNode::add_output(ustring name, SocketType::Type socket_type)
{
	const_cast<NodeType*>(type)->register_output(name, name, socket_type);
}

void OSLNode::compile(SVMCompiler&)
{
	/* doesn't work for SVM, obviously ... */
}

void OSLNode::compile(OSLCompiler& compiler)
{
	if(!filepath.empty())
		compiler.add(this, filepath.c_str(), true);
	else
		compiler.add(this, bytecode_hash.c_str(), false);
}

/* Normal Map */

NODE_DEFINE(NormalMapNode)
{
	NodeType* type = NodeType::add("normal_map", create, NodeType::SHADER);

	static NodeEnum space_enum;
	space_enum.insert("tangent", NODE_NORMAL_MAP_TANGENT);
	space_enum.insert("object", NODE_NORMAL_MAP_OBJECT);
	space_enum.insert("world", NODE_NORMAL_MAP_WORLD);
	space_enum.insert("blender_object", NODE_NORMAL_MAP_BLENDER_OBJECT);
	space_enum.insert("blender_world", NODE_NORMAL_MAP_BLENDER_WORLD);
	SOCKET_ENUM(space, "Space", space_enum, NODE_TANGENT_RADIAL);

	SOCKET_STRING(attribute, "Attribute", ustring(""));

	SOCKET_IN_NORMAL(normal_osl, "NormalIn", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL | SocketType::OSL_INTERNAL);
	SOCKET_IN_FLOAT(strength, "Strength", 1.0f);
	SOCKET_IN_COLOR(color, "Color", make_float3(0.5f, 0.5f, 1.0f));

	SOCKET_OUT_NORMAL(normal, "Normal");

	return type;
}

NormalMapNode::NormalMapNode()
: ShaderNode(node_type)
{
}

void NormalMapNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(shader->has_surface && space == NODE_NORMAL_MAP_TANGENT) {
		if(attribute == ustring("")) {
			attributes->add(ATTR_STD_UV_TANGENT);
			attributes->add(ATTR_STD_UV_TANGENT_SIGN);
		}
		else {
			attributes->add(ustring((string(attribute.c_str()) + ".tangent").c_str()));
			attributes->add(ustring((string(attribute.c_str()) + ".tangent_sign").c_str()));
		}

		attributes->add(ATTR_STD_VERTEX_NORMAL);
	}
	
	ShaderNode::attributes(shader, attributes);
}

void NormalMapNode::compile(SVMCompiler& compiler)
{
	ShaderInput  *color_in = input("Color");
	ShaderInput  *strength_in = input("Strength");
	ShaderOutput *normal_out = output("Normal");
	int attr = 0, attr_sign = 0;

	if(space == NODE_NORMAL_MAP_TANGENT) {
		if(attribute == ustring("")) {
			attr = compiler.attribute(ATTR_STD_UV_TANGENT);
			attr_sign = compiler.attribute(ATTR_STD_UV_TANGENT_SIGN);
		}
		else {
			attr = compiler.attribute(ustring((string(attribute.c_str()) + ".tangent").c_str()));
			attr_sign = compiler.attribute(ustring((string(attribute.c_str()) + ".tangent_sign").c_str()));
		}
	}

	compiler.add_node(NODE_NORMAL_MAP,
		compiler.encode_uchar4(
			compiler.stack_assign(color_in),
			compiler.stack_assign(strength_in),
			compiler.stack_assign(normal_out),
			space),
		attr, attr_sign);
}

void NormalMapNode::compile(OSLCompiler& compiler)
{
	if(space == NODE_NORMAL_MAP_TANGENT) {
		if(attribute == ustring("")) {
			compiler.parameter("attr_name", ustring("geom:tangent"));
			compiler.parameter("attr_sign_name", ustring("geom:tangent_sign"));
		}
		else {
			compiler.parameter("attr_name", ustring((string(attribute.c_str()) + ".tangent").c_str()));
			compiler.parameter("attr_sign_name", ustring((string(attribute.c_str()) + ".tangent_sign").c_str()));
		}
	}

	compiler.parameter(this, "space");
	compiler.add(this, "node_normal_map"); 
}

/* Tangent */

NODE_DEFINE(TangentNode)
{
	NodeType* type = NodeType::add("tangent", create, NodeType::SHADER);

	static NodeEnum direction_type_enum;
	direction_type_enum.insert("radial", NODE_TANGENT_RADIAL);
	direction_type_enum.insert("uv_map", NODE_TANGENT_UVMAP);
	SOCKET_ENUM(direction_type, "Direction Type", direction_type_enum, NODE_TANGENT_RADIAL);

	static NodeEnum axis_enum;
	axis_enum.insert("x", NODE_TANGENT_AXIS_X);
	axis_enum.insert("y", NODE_TANGENT_AXIS_Y);
	axis_enum.insert("z", NODE_TANGENT_AXIS_Z);
	SOCKET_ENUM(axis, "Axis", axis_enum, NODE_TANGENT_AXIS_X);

	SOCKET_STRING(attribute, "Attribute", ustring(""));

	SOCKET_IN_NORMAL(normal_osl, "NormalIn", make_float3(0.0f, 0.0f, 0.0f), SocketType::LINK_NORMAL | SocketType::OSL_INTERNAL);
	SOCKET_OUT_NORMAL(tangent, "Tangent");

	return type;
}

TangentNode::TangentNode()
: ShaderNode(node_type)
{
}

void TangentNode::attributes(Shader *shader, AttributeRequestSet *attributes)
{
	if(shader->has_surface) {
		if(direction_type == NODE_TANGENT_UVMAP) {
			if(attribute == ustring(""))
				attributes->add(ATTR_STD_UV_TANGENT);
			else
				attributes->add(ustring((string(attribute.c_str()) + ".tangent").c_str()));
		}
		else
			attributes->add(ATTR_STD_GENERATED);
	}
	
	ShaderNode::attributes(shader, attributes);
}

void TangentNode::compile(SVMCompiler& compiler)
{
	ShaderOutput *tangent_out = output("Tangent");
	int attr;

	if(direction_type == NODE_TANGENT_UVMAP) {
		if(attribute == ustring(""))
			attr = compiler.attribute(ATTR_STD_UV_TANGENT);
		else
			attr = compiler.attribute(ustring((string(attribute.c_str()) + ".tangent").c_str()));
	}
	else
		attr = compiler.attribute(ATTR_STD_GENERATED);

	compiler.add_node(NODE_TANGENT,
		compiler.encode_uchar4(
			compiler.stack_assign(tangent_out),
			direction_type,
			axis), attr);
}

void TangentNode::compile(OSLCompiler& compiler)
{
	if(direction_type == NODE_TANGENT_UVMAP) {
		if(attribute == ustring(""))
			compiler.parameter("attr_name", ustring("geom:tangent"));
		else
			compiler.parameter("attr_name", ustring((string(attribute.c_str()) + ".tangent").c_str()));
	}

	compiler.parameter(this, "direction_type");
	compiler.parameter(this, "axis");
	compiler.add(this, "node_tangent"); 
}

CCL_NAMESPACE_END