103 lines
3.8 KiB
C
103 lines
3.8 KiB
C
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2022 Blender Foundation */
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#pragma once
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#include "kernel/camera/camera.h"
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#include "kernel/film/adaptive_sampling.h"
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#include "kernel/film/light_passes.h"
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#include "kernel/integrator/path_state.h"
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#include "kernel/integrator/shadow_catcher.h"
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#include "kernel/sample/pattern.h"
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CCL_NAMESPACE_BEGIN
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ccl_device_inline void integrate_camera_sample(KernelGlobals kg,
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const int sample,
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const int x,
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const int y,
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const uint rng_hash,
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ccl_private Ray *ray)
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{
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/* Filter sampling. */
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const float2 rand_filter = (sample == 0) ? make_float2(0.5f, 0.5f) :
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path_rng_2D(kg, rng_hash, sample, PRNG_FILTER);
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/* Depth of field sampling. */
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const float2 rand_lens = (kernel_data.cam.aperturesize > 0.0f) ?
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path_rng_2D(kg, rng_hash, sample, PRNG_LENS) :
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zero_float2();
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/* Motion blur time sampling. */
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const float rand_time = (kernel_data.cam.shuttertime != -1.0f) ?
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path_rng_1D(kg, rng_hash, sample, PRNG_TIME) :
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0.0f;
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/* Generate camera ray. */
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camera_sample(kg, x, y, rand_filter.x, rand_filter.y, rand_lens.x, rand_lens.y, rand_time, ray);
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}
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/* Return false to indicate that this pixel is finished.
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* Used by CPU implementation to not attempt to sample pixel for multiple samples once its known
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* that the pixel did converge. */
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ccl_device bool integrator_init_from_camera(KernelGlobals kg,
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IntegratorState state,
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ccl_global const KernelWorkTile *ccl_restrict tile,
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ccl_global float *render_buffer,
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const int x,
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const int y,
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const int scheduled_sample)
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{
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PROFILING_INIT(kg, PROFILING_RAY_SETUP);
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/* Initialize path state to give basic buffer access and allow early outputs. */
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path_state_init(state, tile, x, y);
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/* Check whether the pixel has converged and should not be sampled anymore. */
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if (!film_need_sample_pixel(kg, state, render_buffer)) {
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return false;
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}
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/* Count the sample and get an effective sample for this pixel.
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*
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* This logic allows to both count actual number of samples per pixel, and to add samples to this
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* pixel after it was converged and samples were added somewhere else (in which case the
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* `scheduled_sample` will be different from actual number of samples in this pixel). */
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const int sample = film_write_sample(
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kg, state, render_buffer, scheduled_sample, tile->sample_offset);
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/* Initialize random number seed for path. */
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const uint rng_hash = path_rng_hash_init(kg, sample, x, y);
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{
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/* Generate camera ray. */
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Ray ray;
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integrate_camera_sample(kg, sample, x, y, rng_hash, &ray);
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if (ray.tmax == 0.0f) {
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return true;
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}
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/* Write camera ray to state. */
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integrator_state_write_ray(kg, state, &ray);
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}
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/* Initialize path state for path integration. */
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path_state_init_integrator(kg, state, sample, rng_hash);
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/* Continue with intersect_closest kernel, optionally initializing volume
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* stack before that if the camera may be inside a volume. */
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if (kernel_data.cam.is_inside_volume) {
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integrator_path_init(kg, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_VOLUME_STACK);
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}
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else {
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integrator_path_init(kg, state, DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST);
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}
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return true;
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}
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CCL_NAMESPACE_END
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