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Differential D12888 Diff 43495 intern/cycles/kernel/integrator/integrator_shade_light.h

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intern/cycles/kernel/integrator/integrator_shade_light.h

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#include "kernel/kernel_accumulate.h" #include "kernel/kernel_accumulate.h"
#include "kernel/kernel_emission.h" #include "kernel/kernel_emission.h"
#include "kernel/kernel_light.h" #include "kernel/kernel_light.h"
#include "kernel/kernel_shader.h" #include "kernel/kernel_shader.h"
CCL_NAMESPACE_BEGIN CCL_NAMESPACE_BEGIN
ccl_device_inline void integrate_light(INTEGRATOR_STATE_ARGS, ccl_device_inline void integrate_light(KernelGlobals kg,
IntegratorState state,
ccl_global float *ccl_restrict render_buffer) ccl_global float *ccl_restrict render_buffer)
{ {
/* Setup light sample. */ /* Setup light sample. */
Intersection isect ccl_optional_struct_init; Intersection isect ccl_optional_struct_init;
integrator_state_read_isect(INTEGRATOR_STATE_PASS, &isect); integrator_state_read_isect(kg, state, &isect);
float3 ray_P = INTEGRATOR_STATE(ray, P); float3 ray_P = INTEGRATOR_STATE(state, ray, P);
const float3 ray_D = INTEGRATOR_STATE(ray, D); const float3 ray_D = INTEGRATOR_STATE(state, ray, D);
const float ray_time = INTEGRATOR_STATE(ray, time); const float ray_time = INTEGRATOR_STATE(state, ray, time);
/* Advance ray beyond light. */ /* Advance ray beyond light. */
/* TODO: can we make this more numerically robust to avoid reintersecting the /* TODO: can we make this more numerically robust to avoid reintersecting the
* same light in some cases? */ * same light in some cases? */
const float3 new_ray_P = ray_offset(ray_P + ray_D * isect.t, ray_D); const float3 new_ray_P = ray_offset(ray_P + ray_D * isect.t, ray_D);
INTEGRATOR_STATE_WRITE(ray, P) = new_ray_P; INTEGRATOR_STATE_WRITE(state, ray, P) = new_ray_P;
INTEGRATOR_STATE_WRITE(ray, t) -= isect.t; INTEGRATOR_STATE_WRITE(state, ray, t) -= isect.t;
/* Set position to where the BSDF was sampled, for correct MIS PDF. */ /* Set position to where the BSDF was sampled, for correct MIS PDF. */
const float mis_ray_t = INTEGRATOR_STATE(path, mis_ray_t); const float mis_ray_t = INTEGRATOR_STATE(state, path, mis_ray_t);
ray_P -= ray_D * mis_ray_t; ray_P -= ray_D * mis_ray_t;
isect.t += mis_ray_t; isect.t += mis_ray_t;
INTEGRATOR_STATE_WRITE(path, mis_ray_t) = mis_ray_t + isect.t; INTEGRATOR_STATE_WRITE(state, path, mis_ray_t) = mis_ray_t + isect.t;
LightSample ls ccl_optional_struct_init; LightSample ls ccl_optional_struct_init;
const bool use_light_sample = light_sample_from_intersection(kg, &isect, ray_P, ray_D, &ls); const bool use_light_sample = light_sample_from_intersection(kg, &isect, ray_P, ray_D, &ls);
if (!use_light_sample) { if (!use_light_sample) {
return; return;
} }
/* Use visibility flag to skip lights. */ /* Use visibility flag to skip lights. */
#ifdef __PASSES__ #ifdef __PASSES__
const uint32_t path_flag = INTEGRATOR_STATE(path, flag); const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
if (ls.shader & SHADER_EXCLUDE_ANY) { if (ls.shader & SHADER_EXCLUDE_ANY) {
if (((ls.shader & SHADER_EXCLUDE_DIFFUSE) && (path_flag & PATH_RAY_DIFFUSE)) || if (((ls.shader & SHADER_EXCLUDE_DIFFUSE) && (path_flag & PATH_RAY_DIFFUSE)) ||
((ls.shader & SHADER_EXCLUDE_GLOSSY) && ((ls.shader & SHADER_EXCLUDE_GLOSSY) &&
((path_flag & (PATH_RAY_GLOSSY | PATH_RAY_REFLECT)) == ((path_flag & (PATH_RAY_GLOSSY | PATH_RAY_REFLECT)) ==
(PATH_RAY_GLOSSY | PATH_RAY_REFLECT))) || (PATH_RAY_GLOSSY | PATH_RAY_REFLECT))) ||
((ls.shader & SHADER_EXCLUDE_TRANSMIT) && (path_flag & PATH_RAY_TRANSMIT)) || ((ls.shader & SHADER_EXCLUDE_TRANSMIT) && (path_flag & PATH_RAY_TRANSMIT)) ||
((ls.shader & SHADER_EXCLUDE_SCATTER) && (path_flag & PATH_RAY_VOLUME_SCATTER))) ((ls.shader & SHADER_EXCLUDE_SCATTER) && (path_flag & PATH_RAY_VOLUME_SCATTER)))
return; return;
} }
#endif #endif
/* Evaluate light shader. */ /* Evaluate light shader. */
/* TODO: does aliasing like this break automatic SoA in CUDA? */ /* TODO: does aliasing like this break automatic SoA in CUDA? */
ShaderDataTinyStorage emission_sd_storage; ShaderDataTinyStorage emission_sd_storage;
ccl_private ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage); ccl_private ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage);
float3 light_eval = light_sample_shader_eval(INTEGRATOR_STATE_PASS, emission_sd, &ls, ray_time); float3 light_eval = light_sample_shader_eval(kg, state, emission_sd, &ls, ray_time);
if (is_zero(light_eval)) { if (is_zero(light_eval)) {
return; return;
} }
/* MIS weighting. */ /* MIS weighting. */
if (!(path_flag & PATH_RAY_MIS_SKIP)) { if (!(path_flag & PATH_RAY_MIS_SKIP)) {
/* multiple importance sampling, get regular light pdf, /* multiple importance sampling, get regular light pdf,
* and compute weight with respect to BSDF pdf */ * and compute weight with respect to BSDF pdf */
const float mis_ray_pdf = INTEGRATOR_STATE(path, mis_ray_pdf); const float mis_ray_pdf = INTEGRATOR_STATE(state, path, mis_ray_pdf);
const float mis_weight = power_heuristic(mis_ray_pdf, ls.pdf); const float mis_weight = power_heuristic(mis_ray_pdf, ls.pdf);
light_eval *= mis_weight; light_eval *= mis_weight;
} }
/* Write to render buffer. */ /* Write to render buffer. */
const float3 throughput = INTEGRATOR_STATE(path, throughput); const float3 throughput = INTEGRATOR_STATE(state, path, throughput);
kernel_accum_emission(INTEGRATOR_STATE_PASS, throughput, light_eval, render_buffer); kernel_accum_emission(kg, state, throughput, light_eval, render_buffer);
} }
ccl_device void integrator_shade_light(INTEGRATOR_STATE_ARGS, ccl_device void integrator_shade_light(KernelGlobals kg,
IntegratorState state,
ccl_global float *ccl_restrict render_buffer) ccl_global float *ccl_restrict render_buffer)
{ {
PROFILING_INIT(kg, PROFILING_SHADE_LIGHT_SETUP); PROFILING_INIT(kg, PROFILING_SHADE_LIGHT_SETUP);
integrate_light(INTEGRATOR_STATE_PASS, render_buffer); integrate_light(kg, state, render_buffer);
/* TODO: we could get stuck in an infinite loop if there are precision issues /* TODO: we could get stuck in an infinite loop if there are precision issues
* and the same light is hit again. * and the same light is hit again.
* *
* As a workaround count this as a transparent bounce. It makes some sense * As a workaround count this as a transparent bounce. It makes some sense
* to interpret lights as transparent surfaces (and support making them opaque), * to interpret lights as transparent surfaces (and support making them opaque),
* but this needs to be revisited. */ * but this needs to be revisited. */
uint32_t transparent_bounce = INTEGRATOR_STATE(path, transparent_bounce) + 1; uint32_t transparent_bounce = INTEGRATOR_STATE(state, path, transparent_bounce) + 1;
INTEGRATOR_STATE_WRITE(path, transparent_bounce) = transparent_bounce; INTEGRATOR_STATE_WRITE(state, path, transparent_bounce) = transparent_bounce;
if (transparent_bounce >= kernel_data.integrator.transparent_max_bounce) { if (transparent_bounce >= kernel_data.integrator.transparent_max_bounce) {
INTEGRATOR_PATH_TERMINATE(DEVICE_KERNEL_INTEGRATOR_SHADE_LIGHT); INTEGRATOR_PATH_TERMINATE(DEVICE_KERNEL_INTEGRATOR_SHADE_LIGHT);
return; return;
} }
else { else {
INTEGRATOR_PATH_NEXT(DEVICE_KERNEL_INTEGRATOR_SHADE_LIGHT, INTEGRATOR_PATH_NEXT(DEVICE_KERNEL_INTEGRATOR_SHADE_LIGHT,
DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST); DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST);
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