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/*
* Adapted from Open Shading Language with this license:
*
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
* All Rights Reserved.
*
* Modifications Copyright 2011, 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.
*/
#ifndef __BSDF_TOON_H__
#define __BSDF_TOON_H__
CCL_NAMESPACE_BEGIN
typedef ccl_addr_space struct ToonBsdf {
SHADER_CLOSURE_BASE;
float size;
float smooth;
} ToonBsdf;
/* DIFFUSE TOON */
ccl_device int bsdf_diffuse_toon_setup(ToonBsdf *bsdf)
{
bsdf->type = CLOSURE_BSDF_DIFFUSE_TOON_ID;
bsdf->size = saturate(bsdf->size);
bsdf->smooth = saturate(bsdf->smooth);
return SD_BSDF|SD_BSDF_HAS_EVAL;
}
ccl_device bool bsdf_toon_merge(const ShaderClosure *a, const ShaderClosure *b)
{
const ToonBsdf *bsdf_a = (const ToonBsdf*)a;
const ToonBsdf *bsdf_b = (const ToonBsdf*)b;
return (isequal_float3(bsdf_a->N, bsdf_b->N)) &&
(bsdf_a->size == bsdf_b->size) &&
(bsdf_a->smooth == bsdf_b->smooth);
}
ccl_device float3 bsdf_toon_get_intensity(float max_angle, float smooth, float angle)
{
float is;
if(angle < max_angle)
is = 1.0f;
else if(angle < (max_angle + smooth) && smooth != 0.0f)
is = (1.0f - (angle - max_angle)/smooth);
else
is = 0.0f;
return make_float3(is, is, is);
}
ccl_device float bsdf_toon_get_sample_angle(float max_angle, float smooth)
{
return fminf(max_angle + smooth, M_PI_2_F);
}
ccl_device float3 bsdf_diffuse_toon_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
const ToonBsdf *bsdf = (const ToonBsdf*)sc;
float max_angle = bsdf->size*M_PI_2_F;
float smooth = bsdf->smooth*M_PI_2_F;
float angle = safe_acosf(fmaxf(dot(bsdf->N, omega_in), 0.0f));
float3 eval = bsdf_toon_get_intensity(max_angle, smooth, angle);
if(eval.x > 0.0f) {
float sample_angle = bsdf_toon_get_sample_angle(max_angle, smooth);
*pdf = 0.5f * M_1_PI_F / (1.0f - cosf(sample_angle));
return *pdf * eval;
}
return make_float3(0.0f, 0.0f, 0.0f);
}
ccl_device float3 bsdf_diffuse_toon_eval_transmit(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
return make_float3(0.0f, 0.0f, 0.0f);
}
ccl_device int bsdf_diffuse_toon_sample(const ShaderClosure *sc, float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
{
const ToonBsdf *bsdf = (const ToonBsdf*)sc;
float max_angle = bsdf->size*M_PI_2_F;
float smooth = bsdf->smooth*M_PI_2_F;
float sample_angle = bsdf_toon_get_sample_angle(max_angle, smooth);
float angle = sample_angle*randu;
if(sample_angle > 0.0f) {
sample_uniform_cone(bsdf->N, sample_angle, randu, randv, omega_in, pdf);
if(dot(Ng, *omega_in) > 0.0f) {
*eval = *pdf * bsdf_toon_get_intensity(max_angle, smooth, angle);
#ifdef __RAY_DIFFERENTIALS__
// TODO: find a better approximation for the bounce
*domega_in_dx = (2.0f * dot(bsdf->N, dIdx)) * bsdf->N - dIdx;
*domega_in_dy = (2.0f * dot(bsdf->N, dIdy)) * bsdf->N - dIdy;
#endif
}
else
*pdf = 0.0f;
}
return LABEL_REFLECT | LABEL_DIFFUSE;
}
/* GLOSSY TOON */
ccl_device int bsdf_glossy_toon_setup(ToonBsdf *bsdf)
{
bsdf->type = CLOSURE_BSDF_GLOSSY_TOON_ID;
bsdf->size = saturate(bsdf->size);
bsdf->smooth = saturate(bsdf->smooth);
return SD_BSDF|SD_BSDF_HAS_EVAL;
}
ccl_device float3 bsdf_glossy_toon_eval_reflect(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
const ToonBsdf *bsdf = (const ToonBsdf*)sc;
float max_angle = bsdf->size*M_PI_2_F;
float smooth = bsdf->smooth*M_PI_2_F;
float cosNI = dot(bsdf->N, omega_in);
float cosNO = dot(bsdf->N, I);
if(cosNI > 0 && cosNO > 0) {
/* reflect the view vector */
float3 R = (2 * cosNO) * bsdf->N - I;
float cosRI = dot(R, omega_in);
float angle = safe_acosf(fmaxf(cosRI, 0.0f));
float3 eval = bsdf_toon_get_intensity(max_angle, smooth, angle);
float sample_angle = bsdf_toon_get_sample_angle(max_angle, smooth);
*pdf = 0.5f * M_1_PI_F / (1.0f - cosf(sample_angle));
return *pdf * eval;
}
return make_float3(0.0f, 0.0f, 0.0f);
}
ccl_device float3 bsdf_glossy_toon_eval_transmit(const ShaderClosure *sc, const float3 I, const float3 omega_in, float *pdf)
{
return make_float3(0.0f, 0.0f, 0.0f);
}
ccl_device int bsdf_glossy_toon_sample(const ShaderClosure *sc, float3 Ng, float3 I, float3 dIdx, float3 dIdy, float randu, float randv, float3 *eval, float3 *omega_in, float3 *domega_in_dx, float3 *domega_in_dy, float *pdf)
{
const ToonBsdf *bsdf = (const ToonBsdf*)sc;
float max_angle = bsdf->size*M_PI_2_F;
float smooth = bsdf->smooth*M_PI_2_F;
float cosNO = dot(bsdf->N, I);
if(cosNO > 0) {
/* reflect the view vector */
float3 R = (2 * cosNO) * bsdf->N - I;
float sample_angle = bsdf_toon_get_sample_angle(max_angle, smooth);
float angle = sample_angle*randu;
sample_uniform_cone(R, sample_angle, randu, randv, omega_in, pdf);
if(dot(Ng, *omega_in) > 0.0f) {
float cosNI = dot(bsdf->N, *omega_in);
/* make sure the direction we chose is still in the right hemisphere */
if(cosNI > 0) {
*eval = *pdf * bsdf_toon_get_intensity(max_angle, smooth, angle);
#ifdef __RAY_DIFFERENTIALS__
*domega_in_dx = (2 * dot(bsdf->N, dIdx)) * bsdf->N - dIdx;
*domega_in_dy = (2 * dot(bsdf->N, dIdy)) * bsdf->N - dIdy;
#endif
}
else
*pdf = 0.0f;
}
else
*pdf = 0.0f;
}
return LABEL_GLOSSY | LABEL_REFLECT;
}
CCL_NAMESPACE_END
#endif /* __BSDF_TOON_H__ */
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