d832d993c5
These replace float3 and packed_float3 in various places in the kernel where a spectral color representation will be used in the future. That representation will require more than 3 channels and conversion to from/RGB. The kernel code was refactored to remove the assumption that Spectrum and RGB colors are the same thing. There are no functional changes, Spectrum is still a float3 and the conversion functions are no-ops. Differential Revision: https://developer.blender.org/D15535
104 lines
3.4 KiB
C
104 lines
3.4 KiB
C
/* SPDX-License-Identifier: Apache-2.0
|
|
* Copyright 2011-2022 Blender Foundation */
|
|
|
|
#pragma once
|
|
|
|
#include "kernel/film/write_passes.h"
|
|
#include "kernel/integrator/path_state.h"
|
|
#include "kernel/integrator/state_util.h"
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
/* Check whether current surface bounce is where path is to be split for the shadow catcher. */
|
|
ccl_device_inline bool kernel_shadow_catcher_is_path_split_bounce(KernelGlobals kg,
|
|
IntegratorState state,
|
|
const int object_flag)
|
|
{
|
|
#ifdef __SHADOW_CATCHER__
|
|
if (!kernel_data.integrator.has_shadow_catcher) {
|
|
return false;
|
|
}
|
|
|
|
/* Check the flag first, avoiding fetches form global memory. */
|
|
if ((object_flag & SD_OBJECT_SHADOW_CATCHER) == 0) {
|
|
return false;
|
|
}
|
|
if (object_flag & SD_OBJECT_HOLDOUT_MASK) {
|
|
return false;
|
|
}
|
|
|
|
const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
|
|
|
|
if ((path_flag & PATH_RAY_TRANSPARENT_BACKGROUND) == 0) {
|
|
/* Split only on primary rays, secondary bounces are to treat shadow catcher as a regular
|
|
* object. */
|
|
return false;
|
|
}
|
|
|
|
if (path_flag & PATH_RAY_SHADOW_CATCHER_HIT) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
#else
|
|
(void)object_flag;
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
/* Check whether the current path can still split. */
|
|
ccl_device_inline bool kernel_shadow_catcher_path_can_split(KernelGlobals kg,
|
|
ConstIntegratorState state)
|
|
{
|
|
if (integrator_path_is_terminated(state)) {
|
|
return false;
|
|
}
|
|
|
|
const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
|
|
|
|
if (path_flag & PATH_RAY_SHADOW_CATCHER_HIT) {
|
|
/* Shadow catcher was already hit and the state was split. No further split is allowed. */
|
|
return false;
|
|
}
|
|
|
|
return (path_flag & PATH_RAY_TRANSPARENT_BACKGROUND) != 0;
|
|
}
|
|
|
|
#ifdef __SHADOW_CATCHER__
|
|
|
|
ccl_device_forceinline bool kernel_shadow_catcher_is_matte_path(const uint32_t path_flag)
|
|
{
|
|
return (path_flag & PATH_RAY_SHADOW_CATCHER_HIT) == 0;
|
|
}
|
|
|
|
ccl_device_forceinline bool kernel_shadow_catcher_is_object_pass(const uint32_t path_flag)
|
|
{
|
|
return path_flag & PATH_RAY_SHADOW_CATCHER_PASS;
|
|
}
|
|
|
|
/* Write shadow catcher passes on a bounce from the shadow catcher object. */
|
|
ccl_device_forceinline void kernel_write_shadow_catcher_bounce_data(
|
|
KernelGlobals kg, IntegratorState state, ccl_global float *ccl_restrict render_buffer)
|
|
{
|
|
kernel_assert(kernel_data.film.pass_shadow_catcher_sample_count != PASS_UNUSED);
|
|
kernel_assert(kernel_data.film.pass_shadow_catcher_matte != PASS_UNUSED);
|
|
|
|
const uint32_t render_pixel_index = INTEGRATOR_STATE(state, path, render_pixel_index);
|
|
const uint64_t render_buffer_offset = (uint64_t)render_pixel_index *
|
|
kernel_data.film.pass_stride;
|
|
ccl_global float *buffer = render_buffer + render_buffer_offset;
|
|
|
|
/* Count sample for the shadow catcher object. */
|
|
kernel_write_pass_float(buffer + kernel_data.film.pass_shadow_catcher_sample_count, 1.0f);
|
|
|
|
/* Since the split is done, the sample does not contribute to the matte, so accumulate it as
|
|
* transparency to the matte. */
|
|
const Spectrum throughput = INTEGRATOR_STATE(state, path, throughput);
|
|
kernel_write_pass_float(buffer + kernel_data.film.pass_shadow_catcher_matte + 3,
|
|
average(throughput));
|
|
}
|
|
|
|
#endif /* __SHADOW_CATCHER__ */
|
|
|
|
CCL_NAMESPACE_END
|