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