forked from bartvdbraak/blender
aae2cea28d
Reviewers: brecht, sergey, dingto, juicyfruit Differential Revision: https://developer.blender.org/D2220
331 lines
10 KiB
C
331 lines
10 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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/* Direction Emission */
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ccl_device_noinline float3 direct_emissive_eval(KernelGlobals *kg,
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ShaderData *emission_sd,
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LightSample *ls,
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ccl_addr_space PathState *state,
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float3 I,
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differential3 dI,
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float t,
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float time)
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{
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/* setup shading at emitter */
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float3 eval;
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int shader_flag = kernel_tex_fetch(__shader_flag, (ls->shader & SHADER_MASK)*SHADER_SIZE);
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#ifdef __BACKGROUND_MIS__
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if(ls->type == LIGHT_BACKGROUND) {
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Ray ray;
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ray.D = ls->D;
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ray.P = ls->P;
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ray.t = 1.0f;
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# ifdef __OBJECT_MOTION__
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ray.time = time;
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# endif
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ray.dP = differential3_zero();
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ray.dD = dI;
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shader_setup_from_background(kg, emission_sd, &ray);
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path_state_modify_bounce(state, true);
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eval = shader_eval_background(kg, emission_sd, state, 0, SHADER_CONTEXT_EMISSION);
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path_state_modify_bounce(state, false);
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}
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else
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#endif
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if(shader_flag & SD_HAS_CONSTANT_EMISSION)
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{
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eval.x = __int_as_float(kernel_tex_fetch(__shader_flag, (ls->shader & SHADER_MASK)*SHADER_SIZE + 2));
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eval.y = __int_as_float(kernel_tex_fetch(__shader_flag, (ls->shader & SHADER_MASK)*SHADER_SIZE + 3));
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eval.z = __int_as_float(kernel_tex_fetch(__shader_flag, (ls->shader & SHADER_MASK)*SHADER_SIZE + 4));
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if((ls->prim != PRIM_NONE) && dot(ls->Ng, I) < 0.0f) {
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ls->Ng = -ls->Ng;
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}
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}
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else
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{
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shader_setup_from_sample(kg, emission_sd,
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ls->P, ls->Ng, I,
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ls->shader, ls->object, ls->prim,
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ls->u, ls->v, t, time, false);
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ls->Ng = ccl_fetch(emission_sd, Ng);
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/* no path flag, we're evaluating this for all closures. that's weak but
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* we'd have to do multiple evaluations otherwise */
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path_state_modify_bounce(state, true);
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shader_eval_surface(kg, emission_sd, NULL, state, 0.0f, 0, SHADER_CONTEXT_EMISSION);
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path_state_modify_bounce(state, false);
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/* evaluate emissive closure */
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if(ccl_fetch(emission_sd, flag) & SD_EMISSION)
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eval = shader_emissive_eval(kg, emission_sd);
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else
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eval = make_float3(0.0f, 0.0f, 0.0f);
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}
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eval *= ls->eval_fac;
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return eval;
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}
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ccl_device_noinline bool direct_emission(KernelGlobals *kg,
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ShaderData *sd,
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ShaderData *emission_sd,
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LightSample *ls,
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ccl_addr_space PathState *state,
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Ray *ray,
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BsdfEval *eval,
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bool *is_lamp)
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{
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if(ls->pdf == 0.0f)
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return false;
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/* todo: implement */
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differential3 dD = differential3_zero();
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/* evaluate closure */
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float3 light_eval = direct_emissive_eval(kg,
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emission_sd,
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ls,
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state,
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-ls->D,
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dD,
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ls->t,
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ccl_fetch(sd, time));
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if(is_zero(light_eval))
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return false;
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/* evaluate BSDF at shading point */
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#ifdef __VOLUME__
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if(ccl_fetch(sd, prim) != PRIM_NONE)
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shader_bsdf_eval(kg, sd, ls->D, eval, ls->pdf, ls->shader & SHADER_USE_MIS);
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else {
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float bsdf_pdf;
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shader_volume_phase_eval(kg, sd, ls->D, eval, &bsdf_pdf);
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if(ls->shader & SHADER_USE_MIS) {
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/* Multiple importance sampling. */
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float mis_weight = power_heuristic(ls->pdf, bsdf_pdf);
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light_eval *= mis_weight;
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}
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}
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#else
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shader_bsdf_eval(kg, sd, ls->D, eval, ls->pdf, ls->shader & SHADER_USE_MIS);
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#endif
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bsdf_eval_mul(eval, light_eval/ls->pdf);
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#ifdef __PASSES__
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/* use visibility flag to skip lights */
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if(ls->shader & SHADER_EXCLUDE_ANY) {
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if(ls->shader & SHADER_EXCLUDE_DIFFUSE) {
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eval->diffuse = make_float3(0.0f, 0.0f, 0.0f);
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eval->subsurface = make_float3(0.0f, 0.0f, 0.0f);
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}
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if(ls->shader & SHADER_EXCLUDE_GLOSSY)
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eval->glossy = make_float3(0.0f, 0.0f, 0.0f);
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if(ls->shader & SHADER_EXCLUDE_TRANSMIT)
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eval->transmission = make_float3(0.0f, 0.0f, 0.0f);
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if(ls->shader & SHADER_EXCLUDE_SCATTER)
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eval->scatter = make_float3(0.0f, 0.0f, 0.0f);
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}
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#endif
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if(bsdf_eval_is_zero(eval))
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return false;
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if(ls->shader & SHADER_CAST_SHADOW) {
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/* setup ray */
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bool transmit = (dot(ccl_fetch(sd, Ng), ls->D) < 0.0f);
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ray->P = ray_offset(ccl_fetch(sd, P), (transmit)? -ccl_fetch(sd, Ng): ccl_fetch(sd, Ng));
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if(ls->t == FLT_MAX) {
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/* distant light */
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ray->D = ls->D;
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ray->t = ls->t;
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}
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else {
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/* other lights, avoid self-intersection */
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ray->D = ray_offset(ls->P, ls->Ng) - ray->P;
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ray->D = normalize_len(ray->D, &ray->t);
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}
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ray->dP = ccl_fetch(sd, dP);
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ray->dD = differential3_zero();
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}
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else {
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/* signal to not cast shadow ray */
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ray->t = 0.0f;
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}
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/* return if it's a lamp for shadow pass */
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*is_lamp = (ls->prim == PRIM_NONE && ls->type != LIGHT_BACKGROUND);
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return true;
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}
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/* Indirect Primitive Emission */
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ccl_device_noinline float3 indirect_primitive_emission(KernelGlobals *kg, ShaderData *sd, float t, int path_flag, float bsdf_pdf)
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{
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/* evaluate emissive closure */
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float3 L = shader_emissive_eval(kg, sd);
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#ifdef __HAIR__
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if(!(path_flag & PATH_RAY_MIS_SKIP) && (ccl_fetch(sd, flag) & SD_USE_MIS) && (ccl_fetch(sd, type) & PRIMITIVE_ALL_TRIANGLE))
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#else
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if(!(path_flag & PATH_RAY_MIS_SKIP) && (ccl_fetch(sd, flag) & SD_USE_MIS))
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#endif
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{
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/* multiple importance sampling, get triangle light pdf,
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* and compute weight with respect to BSDF pdf */
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float pdf = triangle_light_pdf(kg, ccl_fetch(sd, Ng), ccl_fetch(sd, I), t);
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float mis_weight = power_heuristic(bsdf_pdf, pdf);
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return L*mis_weight;
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}
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return L;
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}
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/* Indirect Lamp Emission */
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ccl_device_noinline bool indirect_lamp_emission(KernelGlobals *kg,
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ShaderData *emission_sd,
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ccl_addr_space PathState *state,
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Ray *ray,
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float3 *emission)
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{
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bool hit_lamp = false;
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*emission = make_float3(0.0f, 0.0f, 0.0f);
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for(int lamp = 0; lamp < kernel_data.integrator.num_all_lights; lamp++) {
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LightSample ls;
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if(!lamp_light_eval(kg, lamp, ray->P, ray->D, ray->t, &ls))
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continue;
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#ifdef __PASSES__
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/* use visibility flag to skip lights */
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if(ls.shader & SHADER_EXCLUDE_ANY) {
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if(((ls.shader & SHADER_EXCLUDE_DIFFUSE) && (state->flag & PATH_RAY_DIFFUSE)) ||
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((ls.shader & SHADER_EXCLUDE_GLOSSY) &&
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((state->flag & (PATH_RAY_GLOSSY|PATH_RAY_REFLECT)) == (PATH_RAY_GLOSSY|PATH_RAY_REFLECT))) ||
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((ls.shader & SHADER_EXCLUDE_TRANSMIT) && (state->flag & PATH_RAY_TRANSMIT)) ||
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((ls.shader & SHADER_EXCLUDE_SCATTER) && (state->flag & PATH_RAY_VOLUME_SCATTER)))
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continue;
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}
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#endif
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float3 L = direct_emissive_eval(kg,
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emission_sd,
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&ls,
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state,
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-ray->D,
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ray->dD,
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ls.t,
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ray->time);
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#ifdef __VOLUME__
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if(state->volume_stack[0].shader != SHADER_NONE) {
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/* shadow attenuation */
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Ray volume_ray = *ray;
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volume_ray.t = ls.t;
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float3 volume_tp = make_float3(1.0f, 1.0f, 1.0f);
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kernel_volume_shadow(kg, emission_sd, state, &volume_ray, &volume_tp);
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L *= volume_tp;
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}
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#endif
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if(!(state->flag & PATH_RAY_MIS_SKIP)) {
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/* multiple importance sampling, get regular light pdf,
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* and compute weight with respect to BSDF pdf */
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float mis_weight = power_heuristic(state->ray_pdf, ls.pdf);
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L *= mis_weight;
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}
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*emission += L;
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hit_lamp = true;
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}
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return hit_lamp;
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}
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/* Indirect Background */
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ccl_device_noinline float3 indirect_background(KernelGlobals *kg,
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ShaderData *emission_sd,
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ccl_addr_space PathState *state,
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ccl_addr_space Ray *ray)
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{
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#ifdef __BACKGROUND__
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int shader = kernel_data.background.surface_shader;
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/* use visibility flag to skip lights */
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if(shader & SHADER_EXCLUDE_ANY) {
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if(((shader & SHADER_EXCLUDE_DIFFUSE) && (state->flag & PATH_RAY_DIFFUSE)) ||
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((shader & SHADER_EXCLUDE_GLOSSY) &&
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((state->flag & (PATH_RAY_GLOSSY|PATH_RAY_REFLECT)) == (PATH_RAY_GLOSSY|PATH_RAY_REFLECT))) ||
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((shader & SHADER_EXCLUDE_TRANSMIT) && (state->flag & PATH_RAY_TRANSMIT)) ||
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((shader & SHADER_EXCLUDE_CAMERA) && (state->flag & PATH_RAY_CAMERA)) ||
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((shader & SHADER_EXCLUDE_SCATTER) && (state->flag & PATH_RAY_VOLUME_SCATTER)))
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return make_float3(0.0f, 0.0f, 0.0f);
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}
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/* evaluate background closure */
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# ifdef __SPLIT_KERNEL__
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Ray priv_ray = *ray;
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shader_setup_from_background(kg, emission_sd, &priv_ray);
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# else
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shader_setup_from_background(kg, emission_sd, ray);
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# endif
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path_state_modify_bounce(state, true);
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float3 L = shader_eval_background(kg, emission_sd, state, state->flag, SHADER_CONTEXT_EMISSION);
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path_state_modify_bounce(state, false);
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#ifdef __BACKGROUND_MIS__
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/* check if background light exists or if we should skip pdf */
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int res = kernel_data.integrator.pdf_background_res;
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if(!(state->flag & PATH_RAY_MIS_SKIP) && res) {
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/* multiple importance sampling, get background light pdf for ray
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* direction, and compute weight with respect to BSDF pdf */
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float pdf = background_light_pdf(kg, ray->P, ray->D);
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float mis_weight = power_heuristic(state->ray_pdf, pdf);
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return L*mis_weight;
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}
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#endif
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return L;
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#else
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return make_float3(0.8f, 0.8f, 0.8f);
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#endif
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}
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CCL_NAMESPACE_END
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