forked from bartvdbraak/blender
27d647dcf8
* Tangent: generate a tangent direction for anisotropic shading. Can be either radial around X/Y/Z axis, or from a UV map. The default tangent for the anisotropic BSDF and geometry node is now always radial Z, for UV tangent use this node now. http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/More#Tangent * Normal Map: generate a perturbed normal from an RGB normal map image. This is usually chained with an Image Texture node in the color input, to specify the normal map image. For tangent space normal maps, the UV coordinates for the image must match, and the image texture should be set to Non-Color mode to give correct results. http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/More#Normal_Map * Refraction BSDF: for best results this node should be considered as a building block and not be used on its own, but rather mixed with a glossy node using a fresnel type factor. Otherwise it will give quite dark results at the edges for glossy refraction. http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders#Refraction * Ambient Occlusion: controls the amount of AO a surface receives, rather than having just a global factor in the world. Note that this outputs a shader and not a color, that's for another time. http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Nodes/Shaders#Ambient_Occlusion
452 lines
13 KiB
C++
452 lines
13 KiB
C++
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "kernel_compat_cpu.h"
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#include "kernel_types.h"
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#include "kernel_globals.h"
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#include "kernel_object.h"
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#include "osl_closures.h"
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#include "osl_services.h"
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#include "osl_shader.h"
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#include "util_foreach.h"
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#include <OSL/oslexec.h>
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CCL_NAMESPACE_BEGIN
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tls_ptr(OSLGlobals::ThreadData, OSLGlobals::thread_data);
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/* Threads */
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void OSLShader::thread_init(KernelGlobals *kg)
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{
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OSL::ShadingSystem *ss = kg->osl.ss;
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OSLGlobals::ThreadData *tdata = new OSLGlobals::ThreadData();
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memset(&tdata->globals, 0, sizeof(OSL::ShaderGlobals));
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tdata->thread_info = ss->create_thread_info();
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tls_set(kg->osl.thread_data, tdata);
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kg->osl.services->thread_init(kg);
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}
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void OSLShader::thread_free(KernelGlobals *kg)
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{
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OSL::ShadingSystem *ss = kg->osl.ss;
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OSLGlobals::ThreadData *tdata = tls_get(OSLGlobals::ThreadData, kg->osl.thread_data);
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ss->destroy_thread_info(tdata->thread_info);
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delete tdata;
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}
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/* Globals */
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static void shaderdata_to_shaderglobals(KernelGlobals *kg, ShaderData *sd,
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int path_flag, OSL::ShaderGlobals *globals)
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{
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/* copy from shader data to shader globals */
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globals->P = TO_VEC3(sd->P);
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globals->dPdx = TO_VEC3(sd->dP.dx);
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globals->dPdy = TO_VEC3(sd->dP.dy);
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globals->I = TO_VEC3(sd->I);
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globals->dIdx = TO_VEC3(sd->dI.dx);
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globals->dIdy = TO_VEC3(sd->dI.dy);
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globals->N = TO_VEC3(sd->N);
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globals->Ng = TO_VEC3(sd->Ng);
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globals->u = sd->u;
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globals->dudx = sd->du.dx;
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globals->dudy = sd->du.dy;
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globals->v = sd->v;
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globals->dvdx = sd->dv.dx;
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globals->dvdy = sd->dv.dy;
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globals->dPdu = TO_VEC3(sd->dPdu);
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globals->dPdv = TO_VEC3(sd->dPdv);
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globals->surfacearea = (sd->object == ~0) ? 1.0f : object_surface_area(kg, sd->object);
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/* booleans */
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globals->raytype = path_flag; /* todo: add our own ray types */
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globals->backfacing = (sd->flag & SD_BACKFACING);
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/* don't know yet if we need this */
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globals->flipHandedness = false;
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/* shader data to be used in services callbacks */
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globals->renderstate = sd;
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/* hacky, we leave it to services to fetch actual object matrix */
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globals->shader2common = sd;
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globals->object2common = sd;
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/* must be set to NULL before execute */
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globals->Ci = NULL;
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}
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/* Surface */
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static void flatten_surface_closure_tree(ShaderData *sd, bool no_glossy,
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const OSL::ClosureColor *closure, float3 weight = make_float3(1.0f, 1.0f, 1.0f))
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{
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/* OSL gives us a closure tree, we flatten it into arrays per
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* closure type, for evaluation, sampling, etc later on. */
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if (closure->type == OSL::ClosureColor::COMPONENT) {
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OSL::ClosureComponent *comp = (OSL::ClosureComponent *)closure;
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OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive *)comp->data();
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if (prim) {
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ShaderClosure sc;
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sc.prim = prim;
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sc.weight = weight;
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switch (prim->category()) {
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case OSL::ClosurePrimitive::BSDF: {
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if (sd->num_closure == MAX_CLOSURE)
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return;
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CBSDFClosure *bsdf = (CBSDFClosure *)prim;
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int scattering = bsdf->scattering();
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/* no caustics option */
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if (no_glossy && scattering == LABEL_GLOSSY)
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return;
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/* sample weight */
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float sample_weight = fabsf(average(weight));
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sd->flag |= bsdf->shaderdata_flag();
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sc.sample_weight = sample_weight;
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sc.type = bsdf->shaderclosure_type();
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/* add */
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sd->closure[sd->num_closure++] = sc;
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break;
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}
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case OSL::ClosurePrimitive::Emissive: {
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if (sd->num_closure == MAX_CLOSURE)
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return;
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/* sample weight */
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float sample_weight = fabsf(average(weight));
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sc.sample_weight = sample_weight;
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sc.type = CLOSURE_EMISSION_ID;
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/* flag */
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sd->flag |= SD_EMISSION;
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sd->closure[sd->num_closure++] = sc;
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break;
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}
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case AmbientOcclusion: {
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if (sd->num_closure == MAX_CLOSURE)
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return;
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/* sample weight */
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float sample_weight = fabsf(average(weight));
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sc.sample_weight = sample_weight;
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sc.type = CLOSURE_AMBIENT_OCCLUSION_ID;
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sd->closure[sd->num_closure++] = sc;
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sd->flag |= SD_AO;
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break;
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}
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case OSL::ClosurePrimitive::Holdout:
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if (sd->num_closure == MAX_CLOSURE)
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return;
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sc.sample_weight = 0.0f;
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sc.type = CLOSURE_HOLDOUT_ID;
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sd->flag |= SD_HOLDOUT;
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sd->closure[sd->num_closure++] = sc;
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break;
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case OSL::ClosurePrimitive::BSSRDF:
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case OSL::ClosurePrimitive::Debug:
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break; /* not implemented */
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case OSL::ClosurePrimitive::Background:
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case OSL::ClosurePrimitive::Volume:
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break; /* not relevant */
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}
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}
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}
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else if (closure->type == OSL::ClosureColor::MUL) {
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OSL::ClosureMul *mul = (OSL::ClosureMul *)closure;
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flatten_surface_closure_tree(sd, no_glossy, mul->closure, TO_FLOAT3(mul->weight) * weight);
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}
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else if (closure->type == OSL::ClosureColor::ADD) {
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OSL::ClosureAdd *add = (OSL::ClosureAdd *)closure;
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flatten_surface_closure_tree(sd, no_glossy, add->closureA, weight);
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flatten_surface_closure_tree(sd, no_glossy, add->closureB, weight);
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}
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}
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void OSLShader::eval_surface(KernelGlobals *kg, ShaderData *sd, float randb, int path_flag)
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{
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/* gather pointers */
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OSL::ShadingSystem *ss = kg->osl.ss;
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OSLGlobals::ThreadData *tdata = tls_get(OSLGlobals::ThreadData, kg->osl.thread_data);
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OSL::ShaderGlobals *globals = &tdata->globals;
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OSL::ShadingContext *ctx = (OSL::ShadingContext *)sd->osl_ctx;
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/* setup shader globals from shader data */
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shaderdata_to_shaderglobals(kg, sd, path_flag, globals);
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/* execute shader for this point */
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int shader = sd->shader & SHADER_MASK;
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if (kg->osl.surface_state[shader])
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ss->execute(*ctx, *(kg->osl.surface_state[shader]), *globals);
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/* flatten closure tree */
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sd->num_closure = 0;
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sd->randb_closure = randb;
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if (globals->Ci) {
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bool no_glossy = (path_flag & PATH_RAY_DIFFUSE) && kernel_data.integrator.no_caustics;
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flatten_surface_closure_tree(sd, no_glossy, globals->Ci);
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}
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}
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/* Background */
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static float3 flatten_background_closure_tree(const OSL::ClosureColor *closure)
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{
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/* OSL gives us a closure tree, if we are shading for background there
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* is only one supported closure type at the moment, which has no evaluation
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* functions, so we just sum the weights */
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if (closure->type == OSL::ClosureColor::COMPONENT) {
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OSL::ClosureComponent *comp = (OSL::ClosureComponent *)closure;
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OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive *)comp->data();
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if (prim && prim->category() == OSL::ClosurePrimitive::Background)
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return make_float3(1.0f, 1.0f, 1.0f);
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}
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else if (closure->type == OSL::ClosureColor::MUL) {
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OSL::ClosureMul *mul = (OSL::ClosureMul *)closure;
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return TO_FLOAT3(mul->weight) * flatten_background_closure_tree(mul->closure);
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}
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else if (closure->type == OSL::ClosureColor::ADD) {
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OSL::ClosureAdd *add = (OSL::ClosureAdd *)closure;
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return flatten_background_closure_tree(add->closureA) +
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flatten_background_closure_tree(add->closureB);
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}
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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float3 OSLShader::eval_background(KernelGlobals *kg, ShaderData *sd, int path_flag)
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{
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/* gather pointers */
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OSL::ShadingSystem *ss = kg->osl.ss;
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OSLGlobals::ThreadData *tdata = tls_get(OSLGlobals::ThreadData, kg->osl.thread_data);
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OSL::ShaderGlobals *globals = &tdata->globals;
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OSL::ShadingContext *ctx = (OSL::ShadingContext *)sd->osl_ctx;
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/* setup shader globals from shader data */
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shaderdata_to_shaderglobals(kg, sd, path_flag, globals);
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/* execute shader for this point */
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if (kg->osl.background_state)
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ss->execute(*ctx, *(kg->osl.background_state), *globals);
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/* return background color immediately */
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if (globals->Ci)
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return flatten_background_closure_tree(globals->Ci);
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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/* Volume */
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static void flatten_volume_closure_tree(ShaderData *sd,
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const OSL::ClosureColor *closure, float3 weight = make_float3(1.0f, 1.0f, 1.0f))
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{
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/* OSL gives us a closure tree, we flatten it into arrays per
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* closure type, for evaluation, sampling, etc later on. */
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if (closure->type == OSL::ClosureColor::COMPONENT) {
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OSL::ClosureComponent *comp = (OSL::ClosureComponent *)closure;
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OSL::ClosurePrimitive *prim = (OSL::ClosurePrimitive *)comp->data();
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if (prim) {
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ShaderClosure sc;
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sc.prim = prim;
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sc.weight = weight;
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switch (prim->category()) {
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case OSL::ClosurePrimitive::Volume: {
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if (sd->num_closure == MAX_CLOSURE)
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return;
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/* sample weight */
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float sample_weight = fabsf(average(weight));
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sc.sample_weight = sample_weight;
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sc.type = CLOSURE_VOLUME_ID;
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/* add */
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sd->closure[sd->num_closure++] = sc;
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break;
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}
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case OSL::ClosurePrimitive::Holdout:
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case OSL::ClosurePrimitive::Debug:
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break; /* not implemented */
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case OSL::ClosurePrimitive::Background:
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case OSL::ClosurePrimitive::BSDF:
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case OSL::ClosurePrimitive::Emissive:
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case OSL::ClosurePrimitive::BSSRDF:
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break; /* not relevant */
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}
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}
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}
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else if (closure->type == OSL::ClosureColor::MUL) {
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OSL::ClosureMul *mul = (OSL::ClosureMul *)closure;
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flatten_volume_closure_tree(sd, mul->closure, TO_FLOAT3(mul->weight) * weight);
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}
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else if (closure->type == OSL::ClosureColor::ADD) {
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OSL::ClosureAdd *add = (OSL::ClosureAdd *)closure;
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flatten_volume_closure_tree(sd, add->closureA, weight);
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flatten_volume_closure_tree(sd, add->closureB, weight);
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}
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}
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void OSLShader::eval_volume(KernelGlobals *kg, ShaderData *sd, float randb, int path_flag)
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{
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/* gather pointers */
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OSL::ShadingSystem *ss = kg->osl.ss;
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OSLGlobals::ThreadData *tdata = tls_get(OSLGlobals::ThreadData, kg->osl.thread_data);
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OSL::ShaderGlobals *globals = &tdata->globals;
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OSL::ShadingContext *ctx = (OSL::ShadingContext *)sd->osl_ctx;
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/* setup shader globals from shader data */
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shaderdata_to_shaderglobals(kg, sd, path_flag, globals);
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/* execute shader */
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int shader = sd->shader & SHADER_MASK;
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if (kg->osl.volume_state[shader])
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ss->execute(*ctx, *(kg->osl.volume_state[shader]), *globals);
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if (globals->Ci)
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flatten_volume_closure_tree(sd, globals->Ci);
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}
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/* Displacement */
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void OSLShader::eval_displacement(KernelGlobals *kg, ShaderData *sd)
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{
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/* gather pointers */
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OSL::ShadingSystem *ss = kg->osl.ss;
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OSLGlobals::ThreadData *tdata = tls_get(OSLGlobals::ThreadData, kg->osl.thread_data);
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OSL::ShaderGlobals *globals = &tdata->globals;
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OSL::ShadingContext *ctx = (OSL::ShadingContext *)sd->osl_ctx;
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/* setup shader globals from shader data */
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shaderdata_to_shaderglobals(kg, sd, 0, globals);
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/* execute shader */
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int shader = sd->shader & SHADER_MASK;
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if (kg->osl.displacement_state[shader])
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ss->execute(*ctx, *(kg->osl.displacement_state[shader]), *globals);
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/* get back position */
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sd->P = TO_FLOAT3(globals->P);
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}
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void OSLShader::init(KernelGlobals *kg, ShaderData *sd)
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{
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OSL::ShadingSystem *ss = kg->osl.ss;
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OSLGlobals::ThreadData *tdata = tls_get(OSLGlobals::ThreadData, kg->osl.thread_data);
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sd->osl_ctx = ss->get_context(tdata->thread_info);
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}
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void OSLShader::release(KernelGlobals *kg, ShaderData *sd)
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{
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OSL::ShadingSystem *ss = kg->osl.ss;
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ss->release_context((OSL::ShadingContext *)sd->osl_ctx);
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}
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/* BSDF Closure */
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int OSLShader::bsdf_sample(const ShaderData *sd, const ShaderClosure *sc, float randu, float randv, float3& eval, float3& omega_in, differential3& domega_in, float& pdf)
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{
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CBSDFClosure *sample_bsdf = (CBSDFClosure *)sc->prim;
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pdf = 0.0f;
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return sample_bsdf->sample(sd->Ng,
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sd->I, sd->dI.dx, sd->dI.dy,
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randu, randv,
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omega_in, domega_in.dx, domega_in.dy,
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pdf, eval);
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}
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float3 OSLShader::bsdf_eval(const ShaderData *sd, const ShaderClosure *sc, const float3& omega_in, float& pdf)
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{
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CBSDFClosure *bsdf = (CBSDFClosure *)sc->prim;
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float3 bsdf_eval;
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if (dot(sd->Ng, omega_in) >= 0.0f)
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bsdf_eval = bsdf->eval_reflect(sd->I, omega_in, pdf);
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else
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bsdf_eval = bsdf->eval_transmit(sd->I, omega_in, pdf);
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return bsdf_eval;
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}
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void OSLShader::bsdf_blur(ShaderClosure *sc, float roughness)
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{
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CBSDFClosure *bsdf = (CBSDFClosure *)sc->prim;
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bsdf->blur(roughness);
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}
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/* Emissive Closure */
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float3 OSLShader::emissive_eval(const ShaderData *sd, const ShaderClosure *sc)
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{
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OSL::EmissiveClosure *emissive = (OSL::EmissiveClosure *)sc->prim;
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OSL::Color3 emissive_eval = emissive->eval(TO_VEC3(sd->Ng), TO_VEC3(sd->I));
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return TO_FLOAT3(emissive_eval);
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}
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/* Volume Closure */
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float3 OSLShader::volume_eval_phase(const ShaderClosure *sc, const float3 omega_in, const float3 omega_out)
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{
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OSL::VolumeClosure *volume = (OSL::VolumeClosure *)sc->prim;
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OSL::Color3 volume_eval = volume->eval_phase(TO_VEC3(omega_in), TO_VEC3(omega_out));
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return TO_FLOAT3(volume_eval) * sc->weight;
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}
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CCL_NAMESPACE_END
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