forked from bartvdbraak/blender
375 lines
10 KiB
C
375 lines
10 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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CCL_NAMESPACE_BEGIN
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/* BSDF Eval
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*
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* BSDF evaluation result, split per BSDF type. This is used to accumulate
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* render passes separately. */
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__device_inline void bsdf_eval_init(BsdfEval *eval, ClosureType type, float3 value, int use_light_pass)
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{
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#ifdef __PASSES__
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eval->use_light_pass = use_light_pass;
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if(eval->use_light_pass) {
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eval->diffuse = make_float3(0.0f, 0.0f, 0.0f);
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eval->glossy = make_float3(0.0f, 0.0f, 0.0f);
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eval->transmission = make_float3(0.0f, 0.0f, 0.0f);
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eval->transparent = make_float3(0.0f, 0.0f, 0.0f);
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if(type == CLOSURE_BSDF_TRANSPARENT_ID)
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eval->transparent = value;
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else if(CLOSURE_IS_BSDF_DIFFUSE(type))
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eval->diffuse = value;
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else if(CLOSURE_IS_BSDF_GLOSSY(type))
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eval->glossy = value;
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else
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eval->transmission = value;
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}
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else
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eval->diffuse = value;
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#else
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*eval = value;
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#endif
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}
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__device_inline void bsdf_eval_accum(BsdfEval *eval, ClosureType type, float3 value)
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{
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#ifdef __PASSES__
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if(eval->use_light_pass) {
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if(CLOSURE_IS_BSDF_DIFFUSE(type))
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eval->diffuse += value;
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else if(CLOSURE_IS_BSDF_GLOSSY(type))
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eval->glossy += value;
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else
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eval->transmission += value;
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/* skipping transparent, this function is used by for eval(), will be zero then */
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}
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else
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eval->diffuse += value;
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#else
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*eval += value;
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#endif
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}
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__device_inline bool bsdf_eval_is_zero(BsdfEval *eval)
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{
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#ifdef __PASSES__
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if(eval->use_light_pass) {
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return is_zero(eval->diffuse)
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&& is_zero(eval->glossy)
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&& is_zero(eval->transmission)
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&& is_zero(eval->transparent);
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}
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else
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return is_zero(eval->diffuse);
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#else
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return is_zero(*eval);
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#endif
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}
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__device_inline void bsdf_eval_mul(BsdfEval *eval, float3 value)
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{
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#ifdef __PASSES__
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if(eval->use_light_pass) {
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eval->diffuse *= value;
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eval->glossy *= value;
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eval->transmission *= value;
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/* skipping transparent, this function is used by for eval(), will be zero then */
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}
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else
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eval->diffuse *= value;
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#else
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*eval *= value;
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#endif
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}
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/* Path Radiance
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*
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* We accumulate different render passes separately. After summing at the end
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* to get the combined result, it should be identical. We definte directly
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* visible as the first non-transparent hit, while indirectly visible are the
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* bounces after that. */
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__device_inline void path_radiance_init(PathRadiance *L, int use_light_pass)
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{
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/* clear all */
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#ifdef __PASSES__
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L->use_light_pass = use_light_pass;
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if(use_light_pass) {
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L->indirect = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_throughput = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_emission = make_float3(0.0f, 0.0f, 0.0f);
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L->color_diffuse = make_float3(0.0f, 0.0f, 0.0f);
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L->color_glossy = make_float3(0.0f, 0.0f, 0.0f);
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L->color_transmission = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_diffuse = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_glossy = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_transmission = make_float3(0.0f, 0.0f, 0.0f);
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L->indirect_diffuse = make_float3(0.0f, 0.0f, 0.0f);
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L->indirect_glossy = make_float3(0.0f, 0.0f, 0.0f);
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L->indirect_transmission = make_float3(0.0f, 0.0f, 0.0f);
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L->path_diffuse = make_float3(0.0f, 0.0f, 0.0f);
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L->path_glossy = make_float3(0.0f, 0.0f, 0.0f);
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L->path_transmission = make_float3(0.0f, 0.0f, 0.0f);
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L->emission = make_float3(0.0f, 0.0f, 0.0f);
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L->background = make_float3(0.0f, 0.0f, 0.0f);
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L->ao = make_float3(0.0f, 0.0f, 0.0f);
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L->shadow = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
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}
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else
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L->emission = make_float3(0.0f, 0.0f, 0.0f);
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#else
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*L = make_float3(0.0f, 0.0f, 0.0f);
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#endif
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}
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__device_inline void path_radiance_bsdf_bounce(PathRadiance *L, float3 *throughput,
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BsdfEval *bsdf_eval, float bsdf_pdf, int bounce, int bsdf_label)
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{
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float inverse_pdf = 1.0f/bsdf_pdf;
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#ifdef __PASSES__
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if(L->use_light_pass) {
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if(bounce == 0 && !(bsdf_label & LABEL_TRANSPARENT)) {
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/* first on directly visible surface */
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float3 value = *throughput*inverse_pdf;
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L->path_diffuse = bsdf_eval->diffuse*value;
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L->path_glossy = bsdf_eval->glossy*value;
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L->path_transmission = bsdf_eval->transmission*value;
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*throughput = L->path_diffuse + L->path_glossy + L->path_transmission;
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L->direct_throughput = *throughput;
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}
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else {
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/* transparent bounce before first hit, or indirectly visible through BSDF */
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float3 sum = (bsdf_eval->diffuse + bsdf_eval->glossy + bsdf_eval->transmission + bsdf_eval->transparent)*inverse_pdf;
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*throughput *= sum;
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}
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}
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else
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*throughput *= bsdf_eval->diffuse*inverse_pdf;
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#else
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*throughput *= *bsdf_eval*inverse_pdf;
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#endif
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}
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__device_inline void path_radiance_accum_emission(PathRadiance *L, float3 throughput, float3 value, int bounce)
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{
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#ifdef __PASSES__
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if(L->use_light_pass) {
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if(bounce == 0)
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L->emission += throughput*value;
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else if(bounce == 1)
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L->direct_emission += throughput*value;
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else
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L->indirect += throughput*value;
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}
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else
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L->emission += throughput*value;
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#else
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*L += throughput*value;
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#endif
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}
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__device_inline void path_radiance_accum_ao(PathRadiance *L, float3 throughput, float3 bsdf, float3 ao, int bounce)
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{
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#ifdef __PASSES__
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if(L->use_light_pass) {
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if(bounce == 0) {
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/* directly visible lighting */
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L->direct_diffuse += throughput*bsdf*ao;
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L->ao += throughput*ao;
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}
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else {
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/* indirectly visible lighting after BSDF bounce */
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L->indirect += throughput*bsdf*ao;
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}
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}
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else
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L->emission += throughput*bsdf*ao;
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#else
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*L += throughput*bsdf*ao;
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#endif
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}
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__device_inline void path_radiance_accum_light(PathRadiance *L, float3 throughput, BsdfEval *bsdf_eval, float3 shadow, float shadow_fac, int bounce, bool is_lamp)
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{
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#ifdef __PASSES__
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if(L->use_light_pass) {
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if(bounce == 0) {
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/* directly visible lighting */
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L->direct_diffuse += throughput*bsdf_eval->diffuse*shadow;
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L->direct_glossy += throughput*bsdf_eval->glossy*shadow;
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L->direct_transmission += throughput*bsdf_eval->transmission*shadow;
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if(is_lamp) {
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float3 sum = throughput*(bsdf_eval->diffuse + bsdf_eval->glossy + bsdf_eval->transmission);
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L->shadow.x += shadow.x*shadow_fac;
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L->shadow.y += shadow.y*shadow_fac;
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L->shadow.z += shadow.z*shadow_fac;
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L->shadow.w += average(sum);
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}
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}
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else {
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/* indirectly visible lighting after BSDF bounce */
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float3 sum = bsdf_eval->diffuse + bsdf_eval->glossy + bsdf_eval->transmission;
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L->indirect += throughput*sum*shadow;
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}
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}
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else
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L->emission += throughput*bsdf_eval->diffuse*shadow;
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#else
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*L += throughput*(*bsdf_eval)*shadow;
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#endif
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}
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__device_inline void path_radiance_accum_background(PathRadiance *L, float3 throughput, float3 value, int bounce)
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{
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#ifdef __PASSES__
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if(L->use_light_pass) {
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if(bounce == 0)
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L->background += throughput*value;
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else if(bounce == 1)
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L->direct_emission += throughput*value;
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else
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L->indirect += throughput*value;
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}
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else
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L->emission += throughput*value;
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#else
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*L += throughput*value;
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#endif
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}
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__device_inline void path_radiance_sum_indirect(PathRadiance *L)
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{
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#ifdef __PASSES__
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/* this division is a bit ugly, but means we only have to keep track of
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* only a single throughput further along the path, here we recover just
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* the indirect parth that is not influenced by any particular BSDF type */
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if(L->use_light_pass) {
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L->direct_emission = safe_divide_color(L->direct_emission, L->direct_throughput);
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L->direct_diffuse += L->path_diffuse*L->direct_emission;
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L->direct_glossy += L->path_glossy*L->direct_emission;
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L->direct_transmission += L->path_transmission*L->direct_emission;
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L->indirect = safe_divide_color(L->indirect, L->direct_throughput);
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L->indirect_diffuse += L->path_diffuse*L->indirect;
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L->indirect_glossy += L->path_glossy*L->indirect;
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L->indirect_transmission += L->path_transmission*L->indirect;
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}
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#endif
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}
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__device_inline void path_radiance_reset_indirect(PathRadiance *L)
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{
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#ifdef __PASSES__
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if(L->use_light_pass) {
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L->path_diffuse = make_float3(0.0f, 0.0f, 0.0f);
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L->path_glossy = make_float3(0.0f, 0.0f, 0.0f);
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L->path_transmission = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_emission = make_float3(0.0f, 0.0f, 0.0f);
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L->indirect = make_float3(0.0f, 0.0f, 0.0f);
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}
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#endif
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}
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__device_inline float3 path_radiance_sum(KernelGlobals *kg, PathRadiance *L)
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{
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#ifdef __PASSES__
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if(L->use_light_pass) {
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path_radiance_sum_indirect(L);
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float3 L_sum = L->emission
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+ L->direct_diffuse + L->direct_glossy + L->direct_transmission
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+ L->indirect_diffuse + L->indirect_glossy + L->indirect_transmission;
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if(!kernel_data.background.transparent)
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L_sum += L->background;
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return L_sum;
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}
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else
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return L->emission;
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#else
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return *L;
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#endif
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}
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__device_inline void path_radiance_clamp(PathRadiance *L, float3 *L_sum, float clamp)
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{
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float sum = fabsf((*L_sum).x) + fabsf((*L_sum).y) + fabsf((*L_sum).z);
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if(!isfinite(sum)) {
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/* invalid value, reject */
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*L_sum = make_float3(0.0f, 0.0f, 0.0f);
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#ifdef __PASSES__
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if(L->use_light_pass) {
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L->direct_diffuse = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_glossy = make_float3(0.0f, 0.0f, 0.0f);
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L->direct_transmission = make_float3(0.0f, 0.0f, 0.0f);
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L->indirect_diffuse = make_float3(0.0f, 0.0f, 0.0f);
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L->indirect_glossy = make_float3(0.0f, 0.0f, 0.0f);
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L->indirect_transmission = make_float3(0.0f, 0.0f, 0.0f);
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L->emission = make_float3(0.0f, 0.0f, 0.0f);
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}
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#endif
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}
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else if(sum > clamp) {
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/* value to high, scale down */
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float scale = clamp/sum;
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*L_sum *= scale;
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#ifdef __PASSES__
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if(L->use_light_pass) {
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L->direct_diffuse *= scale;
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L->direct_glossy *= scale;
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L->direct_transmission *= scale;
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L->indirect_diffuse *= scale;
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L->indirect_glossy *= scale;
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L->indirect_transmission *= scale;
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L->emission *= scale;
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}
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#endif
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}
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}
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CCL_NAMESPACE_END
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