OSL Backend:
* Added the Phong BRDF from the inbuilt OSL shader library. This can be used in OSL shaders only for now: * phong(normal N, float exponent) * phong_ramp(normal N, float exponent, color colors[8]
This commit is contained in:
parent
36797a64a5
commit
3f7b4916e9
@ -13,6 +13,7 @@ set(SRC
|
||||
bsdf_ashikhmin_velvet.cpp
|
||||
bsdf_diffuse.cpp
|
||||
bsdf_oren_nayar.cpp
|
||||
bsdf_phong.cpp
|
||||
bsdf_microfacet.cpp
|
||||
bsdf_reflection.cpp
|
||||
bsdf_refraction.cpp
|
||||
|
277
intern/cycles/kernel/osl/bsdf_phong.cpp
Normal file
277
intern/cycles/kernel/osl/bsdf_phong.cpp
Normal file
@ -0,0 +1,277 @@
|
||||
/*
|
||||
* Adapted from Open Shading Language with this license:
|
||||
*
|
||||
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
|
||||
* All Rights Reserved.
|
||||
*
|
||||
* Modifications Copyright 2012, Blender Foundation.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions are
|
||||
* met:
|
||||
* * Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* * Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* * Neither the name of Sony Pictures Imageworks nor the names of its
|
||||
* contributors may be used to endorse or promote products derived from
|
||||
* this software without specific prior written permission.
|
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
#include <OpenImageIO/fmath.h>
|
||||
|
||||
#include <OSL/genclosure.h>
|
||||
#include "osl_closures.h"
|
||||
#include "util_math.h"
|
||||
|
||||
CCL_NAMESPACE_BEGIN
|
||||
|
||||
using namespace OSL;
|
||||
|
||||
// vanilla phong - leaks energy at grazing angles
|
||||
// see Global Illumination Compendium entry (66)
|
||||
class PhongClosure : public BSDFClosure {
|
||||
public:
|
||||
Vec3 m_N;
|
||||
float m_exponent;
|
||||
PhongClosure() : BSDFClosure(Labels::GLOSSY) { }
|
||||
|
||||
void setup() {};
|
||||
|
||||
bool mergeable (const ClosurePrimitive *other) const {
|
||||
const PhongClosure *comp = (const PhongClosure *)other;
|
||||
return m_N == comp->m_N && m_exponent == comp->m_exponent &&
|
||||
BSDFClosure::mergeable(other);
|
||||
}
|
||||
|
||||
size_t memsize () const { return sizeof(*this); }
|
||||
|
||||
const char *name () const { return "phong"; }
|
||||
|
||||
void print_on (std::ostream &out) const {
|
||||
out << name() << " ((";
|
||||
out << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "), ";
|
||||
out << m_exponent << ")";
|
||||
}
|
||||
|
||||
float albedo (const Vec3 &omega_out) const
|
||||
{
|
||||
return 1.0f;
|
||||
}
|
||||
|
||||
Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
|
||||
{
|
||||
float cosNI = m_N.dot(omega_in);
|
||||
float cosNO = m_N.dot(omega_out);
|
||||
if (cosNI > 0 && cosNO > 0) {
|
||||
// reflect the view vector
|
||||
Vec3 R = (2 * cosNO) * m_N - omega_out;
|
||||
float cosRI = R.dot(omega_in);
|
||||
if (cosRI > 0) {
|
||||
float common = 0.5f * (float) M_1_PI * powf(cosRI, m_exponent);
|
||||
float out = cosNI * (m_exponent + 2) * common;
|
||||
pdf = (m_exponent + 1) * common;
|
||||
return Color3 (out, out, out);
|
||||
}
|
||||
}
|
||||
return Color3 (0, 0, 0);
|
||||
}
|
||||
|
||||
Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
|
||||
{
|
||||
return Color3 (0, 0, 0);
|
||||
}
|
||||
|
||||
ustring sample (const Vec3 &Ng,
|
||||
const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
|
||||
float randu, float randv,
|
||||
Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
|
||||
float &pdf, Color3 &eval) const
|
||||
{
|
||||
float cosNO = m_N.dot(omega_out);
|
||||
if (cosNO > 0) {
|
||||
// reflect the view vector
|
||||
Vec3 R = (2 * cosNO) * m_N - omega_out;
|
||||
domega_in_dx = (2 * m_N.dot(domega_out_dx)) * m_N - domega_out_dx;
|
||||
domega_in_dy = (2 * m_N.dot(domega_out_dy)) * m_N - domega_out_dy;
|
||||
Vec3 T, B;
|
||||
make_orthonormals (R, T, B);
|
||||
float phi = 2 * (float) M_PI * randu;
|
||||
float cosTheta = powf(randv, 1 / (m_exponent + 1));
|
||||
float sinTheta2 = 1 - cosTheta * cosTheta;
|
||||
float sinTheta = sinTheta2 > 0 ? sqrtf(sinTheta2) : 0;
|
||||
omega_in = (cosf(phi) * sinTheta) * T +
|
||||
(sinf(phi) * sinTheta) * B +
|
||||
( cosTheta) * R;
|
||||
if (Ng.dot(omega_in) > 0)
|
||||
{
|
||||
// common terms for pdf and eval
|
||||
float cosNI = m_N.dot(omega_in);
|
||||
// make sure the direction we chose is still in the right hemisphere
|
||||
if (cosNI > 0)
|
||||
{
|
||||
float common = 0.5f * (float) M_1_PI * powf(cosTheta, m_exponent);
|
||||
pdf = (m_exponent + 1) * common;
|
||||
float out = cosNI * (m_exponent + 2) * common;
|
||||
eval.setValue(out, out, out);
|
||||
// Since there is some blur to this reflection, make the
|
||||
// derivatives a bit bigger. In theory this varies with the
|
||||
// exponent but the exact relationship is complex and
|
||||
// requires more ops than are practical.
|
||||
domega_in_dx *= 10;
|
||||
domega_in_dy *= 10;
|
||||
}
|
||||
}
|
||||
}
|
||||
return Labels::REFLECT;
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
class PhongRampClosure : public BSDFClosure {
|
||||
public:
|
||||
static const int MAXCOLORS = 8;
|
||||
Vec3 m_N;
|
||||
float m_exponent;
|
||||
Color3 m_colors[MAXCOLORS];
|
||||
PhongRampClosure() : BSDFClosure(Labels::GLOSSY) { }
|
||||
|
||||
void setup() {};
|
||||
|
||||
bool mergeable (const ClosurePrimitive *other) const {
|
||||
const PhongRampClosure *comp = (const PhongRampClosure *)other;
|
||||
if (! (m_N == comp->m_N && m_exponent == comp->m_exponent &&
|
||||
BSDFClosure::mergeable(other)))
|
||||
return false;
|
||||
for (int i = 0; i < MAXCOLORS; ++i)
|
||||
if (m_colors[i] != comp->m_colors[i])
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
size_t memsize () const { return sizeof(*this); }
|
||||
|
||||
const char *name () const { return "phong_ramp"; }
|
||||
|
||||
void print_on (std::ostream &out) const {
|
||||
out << name() << " ((";
|
||||
out << m_N[0] << ", " << m_N[1] << ", " << m_N[2] << "), ";
|
||||
out << m_exponent << ")";
|
||||
}
|
||||
|
||||
Color3 get_color (float pos) const
|
||||
{
|
||||
float npos = pos * (float)(MAXCOLORS - 1);
|
||||
int ipos = (int)npos;
|
||||
if (ipos >= (MAXCOLORS - 1))
|
||||
return m_colors[MAXCOLORS - 1];
|
||||
float offset = npos - (float)ipos;
|
||||
return m_colors[ipos] * (1.0f - offset) + m_colors[ipos+1] * offset;
|
||||
}
|
||||
|
||||
float albedo (const Vec3 &omega_out) const
|
||||
{
|
||||
return 1.0f;
|
||||
}
|
||||
|
||||
Color3 eval_reflect (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
|
||||
{
|
||||
float cosNI = m_N.dot(omega_in);
|
||||
float cosNO = m_N.dot(omega_out);
|
||||
if (cosNI > 0 && cosNO > 0) {
|
||||
// reflect the view vector
|
||||
Vec3 R = (2 * cosNO) * m_N - omega_out;
|
||||
float cosRI = R.dot(omega_in);
|
||||
if (cosRI > 0) {
|
||||
float cosp = powf(cosRI, m_exponent);
|
||||
float common = 0.5f * (float) M_1_PI * cosp;
|
||||
float out = cosNI * (m_exponent + 2) * common;
|
||||
pdf = (m_exponent + 1) * common;
|
||||
return get_color(cosp) * out;
|
||||
}
|
||||
}
|
||||
return Color3 (0, 0, 0);
|
||||
}
|
||||
|
||||
Color3 eval_transmit (const Vec3 &omega_out, const Vec3 &omega_in, float& pdf) const
|
||||
{
|
||||
return Color3 (0, 0, 0);
|
||||
}
|
||||
|
||||
ustring sample (const Vec3 &Ng,
|
||||
const Vec3 &omega_out, const Vec3 &domega_out_dx, const Vec3 &domega_out_dy,
|
||||
float randu, float randv,
|
||||
Vec3 &omega_in, Vec3 &domega_in_dx, Vec3 &domega_in_dy,
|
||||
float &pdf, Color3 &eval) const
|
||||
{
|
||||
float cosNO = m_N.dot(omega_out);
|
||||
if (cosNO > 0) {
|
||||
// reflect the view vector
|
||||
Vec3 R = (2 * cosNO) * m_N - omega_out;
|
||||
domega_in_dx = (2 * m_N.dot(domega_out_dx)) * m_N - domega_out_dx;
|
||||
domega_in_dy = (2 * m_N.dot(domega_out_dy)) * m_N - domega_out_dy;
|
||||
Vec3 T, B;
|
||||
make_orthonormals (R, T, B);
|
||||
float phi = 2 * (float) M_PI * randu;
|
||||
float cosTheta = powf(randv, 1 / (m_exponent + 1));
|
||||
float sinTheta2 = 1 - cosTheta * cosTheta;
|
||||
float sinTheta = sinTheta2 > 0 ? sqrtf(sinTheta2) : 0;
|
||||
omega_in = (cosf(phi) * sinTheta) * T +
|
||||
(sinf(phi) * sinTheta) * B +
|
||||
( cosTheta) * R;
|
||||
if (Ng.dot(omega_in) > 0)
|
||||
{
|
||||
// common terms for pdf and eval
|
||||
float cosNI = m_N.dot(omega_in);
|
||||
// make sure the direction we chose is still in the right hemisphere
|
||||
if (cosNI > 0)
|
||||
{
|
||||
float cosp = powf(cosTheta, m_exponent);
|
||||
float common = 0.5f * (float) M_1_PI * cosp;
|
||||
pdf = (m_exponent + 1) * common;
|
||||
float out = cosNI * (m_exponent + 2) * common;
|
||||
eval = get_color(cosp) * out;
|
||||
// Since there is some blur to this reflection, make the
|
||||
// derivatives a bit bigger. In theory this varies with the
|
||||
// exponent but the exact relationship is complex and
|
||||
// requires more ops than are practical.
|
||||
domega_in_dx *= 10;
|
||||
domega_in_dy *= 10;
|
||||
}
|
||||
}
|
||||
}
|
||||
return Labels::REFLECT;
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
|
||||
ClosureParam bsdf_phong_params[] = {
|
||||
CLOSURE_VECTOR_PARAM(PhongClosure, m_N),
|
||||
CLOSURE_FLOAT_PARAM (PhongClosure, m_exponent),
|
||||
CLOSURE_STRING_KEYPARAM("label"),
|
||||
CLOSURE_FINISH_PARAM(PhongClosure) };
|
||||
|
||||
ClosureParam bsdf_phong_ramp_params[] = {
|
||||
CLOSURE_VECTOR_PARAM (PhongRampClosure, m_N),
|
||||
CLOSURE_FLOAT_PARAM (PhongRampClosure, m_exponent),
|
||||
CLOSURE_COLOR_ARRAY_PARAM(PhongRampClosure, m_colors, PhongRampClosure::MAXCOLORS),
|
||||
CLOSURE_STRING_KEYPARAM("label"),
|
||||
CLOSURE_FINISH_PARAM (PhongRampClosure) };
|
||||
|
||||
CLOSURE_PREPARE(bsdf_phong_prepare, PhongClosure)
|
||||
CLOSURE_PREPARE(bsdf_phong_ramp_prepare, PhongRampClosure)
|
||||
|
||||
CCL_NAMESPACE_END
|
@ -75,6 +75,8 @@ void OSLShader::register_closures(OSL::ShadingSystem *ss)
|
||||
register_closure(ss, "microfacet_beckmann", OSL_CLOSURE_BSDF_MICROFACET_BECKMANN_ID, bsdf_microfacet_beckmann_params, bsdf_microfacet_beckmann_prepare);
|
||||
register_closure(ss, "microfacet_beckmann_refraction", OSL_CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID, bsdf_microfacet_beckmann_refraction_params, bsdf_microfacet_beckmann_refraction_prepare);
|
||||
register_closure(ss, "ward", OSL_CLOSURE_BSDF_WARD_ID, bsdf_ward_params, bsdf_ward_prepare);
|
||||
register_closure(ss, "phong", OSL_CLOSURE_BSDF_PHONG_ID, bsdf_phong_params, bsdf_phong_prepare);
|
||||
register_closure(ss, "phong_ramp", OSL_CLOSURE_BSDF_PHONG_RAMP_ID, bsdf_phong_ramp_params, bsdf_phong_ramp_prepare);
|
||||
register_closure(ss, "ashikhmin_velvet", OSL_CLOSURE_BSDF_ASHIKHMIN_VELVET_ID, bsdf_ashikhmin_velvet_params, bsdf_ashikhmin_velvet_prepare);
|
||||
register_closure(ss, "westin_backscatter", OSL_CLOSURE_BSDF_WESTIN_BACKSCATTER_ID, bsdf_westin_backscatter_params, bsdf_westin_backscatter_prepare);
|
||||
register_closure(ss, "westin_sheen", OSL_CLOSURE_BSDF_WESTIN_SHEEN_ID, bsdf_westin_sheen_params, bsdf_westin_sheen_prepare);
|
||||
|
@ -51,6 +51,8 @@ enum {
|
||||
OSL_CLOSURE_BSDF_MICROFACET_BECKMANN_ID,
|
||||
OSL_CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID,
|
||||
OSL_CLOSURE_BSDF_WARD_ID,
|
||||
OSL_CLOSURE_BSDF_PHONG_ID,
|
||||
OSL_CLOSURE_BSDF_PHONG_RAMP_ID,
|
||||
OSL_CLOSURE_BSDF_ASHIKHMIN_VELVET_ID,
|
||||
OSL_CLOSURE_BSDF_WESTIN_BACKSCATTER_ID,
|
||||
OSL_CLOSURE_BSDF_WESTIN_SHEEN_ID,
|
||||
@ -73,6 +75,8 @@ extern OSL::ClosureParam bsdf_microfacet_ggx_refraction_params[];
|
||||
extern OSL::ClosureParam bsdf_microfacet_beckmann_params[];
|
||||
extern OSL::ClosureParam bsdf_microfacet_beckmann_refraction_params[];
|
||||
extern OSL::ClosureParam bsdf_ward_params[];
|
||||
extern OSL::ClosureParam bsdf_phong_params[];
|
||||
extern OSL::ClosureParam bsdf_phong_ramp_params[];
|
||||
extern OSL::ClosureParam bsdf_ashikhmin_velvet_params[];
|
||||
extern OSL::ClosureParam bsdf_westin_backscatter_params[];
|
||||
extern OSL::ClosureParam bsdf_westin_sheen_params[];
|
||||
@ -94,6 +98,8 @@ void bsdf_microfacet_ggx_refraction_prepare(OSL::RendererServices *, int id, voi
|
||||
void bsdf_microfacet_beckmann_prepare(OSL::RendererServices *, int id, void *data);
|
||||
void bsdf_microfacet_beckmann_refraction_prepare(OSL::RendererServices *, int id, void *data);
|
||||
void bsdf_ward_prepare(OSL::RendererServices *, int id, void *data);
|
||||
void bsdf_phong_prepare(OSL::RendererServices *, int id, void *data);
|
||||
void bsdf_phong_ramp_prepare(OSL::RendererServices *, int id, void *data);
|
||||
void bsdf_ashikhmin_velvet_prepare(OSL::RendererServices *, int id, void *data);
|
||||
void bsdf_westin_backscatter_prepare(OSL::RendererServices *, int id, void *data);
|
||||
void bsdf_westin_sheen_prepare(OSL::RendererServices *, int id, void *data);
|
||||
|
Loading…
Reference in New Issue
Block a user