forked from bartvdbraak/blender
255 lines
12 KiB
C
255 lines
12 KiB
C
/*
|
|
* Copyright 2011-2015 Blender Foundation
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#include "kernel_split_common.h"
|
|
|
|
/* Note on kernel_background_buffer_update kernel.
|
|
* This is the fourth kernel in the ray tracing logic, and the third
|
|
* of the path iteration kernels. This kernel takes care of rays that hit
|
|
* the background (sceneintersect kernel), and for the rays of
|
|
* state RAY_UPDATE_BUFFER it updates the ray's accumulated radiance in
|
|
* the output buffer. This kernel also takes care of rays that have been determined
|
|
* to-be-regenerated.
|
|
*
|
|
* We will empty QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue in this kernel
|
|
*
|
|
* Typically all rays that are in state RAY_HIT_BACKGROUND, RAY_UPDATE_BUFFER
|
|
* will be eventually set to RAY_TO_REGENERATE state in this kernel. Finally all rays of ray_state
|
|
* RAY_TO_REGENERATE will be regenerated and put in queue QUEUE_ACTIVE_AND_REGENERATED_RAYS.
|
|
*
|
|
* The input and output are as follows,
|
|
*
|
|
* rng_coop ---------------------------------------------|--- kernel_background_buffer_update --|--- PathRadiance_coop
|
|
* throughput_coop --------------------------------------| |--- L_transparent_coop
|
|
* per_sample_output_buffers ----------------------------| |--- per_sample_output_buffers
|
|
* Ray_coop ---------------------------------------------| |--- ray_state
|
|
* PathState_coop ---------------------------------------| |--- Queue_data (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
|
|
* L_transparent_coop -----------------------------------| |--- Queue_data (QUEUE_ACTIVE_AND_REGENERATED_RAYS)
|
|
* ray_state --------------------------------------------| |--- Queue_index (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
|
|
* Queue_data (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS) ----| |--- Queue_index (QUEUE_ACTIVE_AND_REGENERATED_RAYS)
|
|
* Queue_index (QUEUE_ACTIVE_AND_REGENERATED_RAYS) ------| |--- work_array
|
|
* parallel_samples -------------------------------------| |--- PathState_coop
|
|
* end_sample -------------------------------------------| |--- throughput_coop
|
|
* kg (globals + data) ----------------------------------| |--- rng_coop
|
|
* rng_state --------------------------------------------| |--- Ray
|
|
* PathRadiance_coop ------------------------------------| |
|
|
* sw ---------------------------------------------------| |
|
|
* sh ---------------------------------------------------| |
|
|
* sx ---------------------------------------------------| |
|
|
* sy ---------------------------------------------------| |
|
|
* stride -----------------------------------------------| |
|
|
* work_array -------------------------------------------| |--- work_array
|
|
* queuesize --------------------------------------------| |
|
|
* start_sample -----------------------------------------| |--- work_pool_wgs
|
|
* work_pool_wgs ----------------------------------------| |
|
|
* num_samples ------------------------------------------| |
|
|
*
|
|
* note on shader_data : shader_data argument is neither an input nor an output for this kernel. It is just filled and consumed here itself.
|
|
* Note on Queues :
|
|
* This kernel fetches rays from QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue.
|
|
*
|
|
* State of queues when this kernel is called :
|
|
* At entry,
|
|
* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE rays
|
|
* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be filled with RAY_UPDATE_BUFFER, RAY_HIT_BACKGROUND, RAY_TO_REGENERATE rays
|
|
* At exit,
|
|
* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE and RAY_REGENERATED rays
|
|
* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be empty
|
|
*/
|
|
ccl_device char kernel_background_buffer_update(
|
|
ccl_global char *globals,
|
|
ccl_constant KernelData *data,
|
|
ccl_global char *shader_data,
|
|
ccl_global float *per_sample_output_buffers,
|
|
ccl_global uint *rng_state,
|
|
ccl_global uint *rng_coop, /* Required for buffer Update */
|
|
ccl_global float3 *throughput_coop, /* Required for background hit processing */
|
|
PathRadiance *PathRadiance_coop, /* Required for background hit processing and buffer Update */
|
|
ccl_global Ray *Ray_coop, /* Required for background hit processing */
|
|
ccl_global PathState *PathState_coop, /* Required for background hit processing */
|
|
ccl_global float *L_transparent_coop, /* Required for background hit processing and buffer Update */
|
|
ccl_global char *ray_state, /* Stores information on the current state of a ray */
|
|
int sw, int sh, int sx, int sy, int stride,
|
|
int rng_state_offset_x,
|
|
int rng_state_offset_y,
|
|
int rng_state_stride,
|
|
ccl_global unsigned int *work_array, /* Denotes work of each ray */
|
|
int end_sample,
|
|
int start_sample,
|
|
#ifdef __WORK_STEALING__
|
|
ccl_global unsigned int *work_pool_wgs,
|
|
unsigned int num_samples,
|
|
#endif
|
|
#ifdef __KERNEL_DEBUG__
|
|
DebugData *debugdata_coop,
|
|
#endif
|
|
int parallel_samples, /* Number of samples to be processed in parallel */
|
|
int ray_index)
|
|
{
|
|
char enqueue_flag = 0;
|
|
|
|
/* Load kernel globals structure and ShaderData strucuture */
|
|
KernelGlobals *kg = (KernelGlobals *)globals;
|
|
ShaderData *sd = (ShaderData *)shader_data;
|
|
|
|
#ifdef __KERNEL_DEBUG__
|
|
DebugData *debug_data = &debugdata_coop[ray_index];
|
|
#endif
|
|
ccl_global PathState *state = &PathState_coop[ray_index];
|
|
PathRadiance *L = L = &PathRadiance_coop[ray_index];
|
|
ccl_global Ray *ray = &Ray_coop[ray_index];
|
|
ccl_global float3 *throughput = &throughput_coop[ray_index];
|
|
ccl_global float *L_transparent = &L_transparent_coop[ray_index];
|
|
ccl_global uint *rng = &rng_coop[ray_index];
|
|
|
|
#ifdef __WORK_STEALING__
|
|
unsigned int my_work;
|
|
ccl_global float *initial_per_sample_output_buffers;
|
|
ccl_global uint *initial_rng;
|
|
#endif
|
|
unsigned int sample;
|
|
unsigned int tile_x;
|
|
unsigned int tile_y;
|
|
unsigned int pixel_x;
|
|
unsigned int pixel_y;
|
|
unsigned int my_sample_tile;
|
|
|
|
#ifdef __WORK_STEALING__
|
|
my_work = work_array[ray_index];
|
|
sample = get_my_sample(my_work, sw, sh, parallel_samples, ray_index) + start_sample;
|
|
get_pixel_tile_position(&pixel_x, &pixel_y,
|
|
&tile_x, &tile_y,
|
|
my_work,
|
|
sw, sh, sx, sy,
|
|
parallel_samples,
|
|
ray_index);
|
|
my_sample_tile = 0;
|
|
initial_per_sample_output_buffers = per_sample_output_buffers;
|
|
initial_rng = rng_state;
|
|
#else /* __WORK_STEALING__ */
|
|
sample = work_array[ray_index];
|
|
int tile_index = ray_index / parallel_samples;
|
|
/* buffer and rng_state's stride is "stride". Find x and y using ray_index */
|
|
tile_x = tile_index % sw;
|
|
tile_y = tile_index / sw;
|
|
my_sample_tile = ray_index - (tile_index * parallel_samples);
|
|
#endif /* __WORK_STEALING__ */
|
|
|
|
rng_state += (rng_state_offset_x + tile_x) + (rng_state_offset_y + tile_y) * rng_state_stride;
|
|
per_sample_output_buffers += (((tile_x + (tile_y * stride)) * parallel_samples) + my_sample_tile) * kernel_data.film.pass_stride;
|
|
|
|
if(IS_STATE(ray_state, ray_index, RAY_HIT_BACKGROUND)) {
|
|
/* eval background shader if nothing hit */
|
|
if(kernel_data.background.transparent && (state->flag & PATH_RAY_CAMERA)) {
|
|
*L_transparent = (*L_transparent) + average((*throughput));
|
|
#ifdef __PASSES__
|
|
if(!(kernel_data.film.pass_flag & PASS_BACKGROUND))
|
|
#endif
|
|
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER);
|
|
}
|
|
|
|
if(IS_STATE(ray_state, ray_index, RAY_HIT_BACKGROUND)) {
|
|
#ifdef __BACKGROUND__
|
|
/* sample background shader */
|
|
float3 L_background = indirect_background(kg, state, ray, sd);
|
|
path_radiance_accum_background(L, (*throughput), L_background, state->bounce);
|
|
#endif
|
|
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER);
|
|
}
|
|
}
|
|
|
|
if(IS_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER)) {
|
|
float3 L_sum = path_radiance_clamp_and_sum(kg, L);
|
|
kernel_write_light_passes(kg, per_sample_output_buffers, L, sample);
|
|
#ifdef __KERNEL_DEBUG__
|
|
kernel_write_debug_passes(kg, per_sample_output_buffers, state, debug_data, sample);
|
|
#endif
|
|
float4 L_rad = make_float4(L_sum.x, L_sum.y, L_sum.z, 1.0f - (*L_transparent));
|
|
|
|
/* accumulate result in output buffer */
|
|
kernel_write_pass_float4(per_sample_output_buffers, sample, L_rad);
|
|
path_rng_end(kg, rng_state, *rng);
|
|
|
|
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_TO_REGENERATE);
|
|
}
|
|
|
|
if(IS_STATE(ray_state, ray_index, RAY_TO_REGENERATE)) {
|
|
#ifdef __WORK_STEALING__
|
|
/* We have completed current work; So get next work */
|
|
int valid_work = get_next_work(work_pool_wgs, &my_work, sw, sh, num_samples, parallel_samples, ray_index);
|
|
if(!valid_work) {
|
|
/* If work is invalid, this means no more work is available and the thread may exit */
|
|
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_INACTIVE);
|
|
}
|
|
#else /* __WORK_STEALING__ */
|
|
if((sample + parallel_samples) >= end_sample) {
|
|
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_INACTIVE);
|
|
}
|
|
#endif /* __WORK_STEALING__ */
|
|
|
|
if(IS_STATE(ray_state, ray_index, RAY_TO_REGENERATE)) {
|
|
#ifdef __WORK_STEALING__
|
|
work_array[ray_index] = my_work;
|
|
/* Get the sample associated with the current work */
|
|
sample = get_my_sample(my_work, sw, sh, parallel_samples, ray_index) + start_sample;
|
|
/* Get pixel and tile position associated with current work */
|
|
get_pixel_tile_position(&pixel_x, &pixel_y, &tile_x, &tile_y, my_work, sw, sh, sx, sy, parallel_samples, ray_index);
|
|
my_sample_tile = 0;
|
|
|
|
/* Remap rng_state according to the current work */
|
|
rng_state = initial_rng + ((rng_state_offset_x + tile_x) + (rng_state_offset_y + tile_y) * rng_state_stride);
|
|
/* Remap per_sample_output_buffers according to the current work */
|
|
per_sample_output_buffers = initial_per_sample_output_buffers
|
|
+ (((tile_x + (tile_y * stride)) * parallel_samples) + my_sample_tile) * kernel_data.film.pass_stride;
|
|
#else /* __WORK_STEALING__ */
|
|
work_array[ray_index] = sample + parallel_samples;
|
|
sample = work_array[ray_index];
|
|
|
|
/* Get ray position from ray index */
|
|
pixel_x = sx + ((ray_index / parallel_samples) % sw);
|
|
pixel_y = sy + ((ray_index / parallel_samples) / sw);
|
|
#endif /* __WORK_STEALING__ */
|
|
|
|
/* Initialize random numbers and ray. */
|
|
kernel_path_trace_setup(kg, rng_state, sample, pixel_x, pixel_y, rng, ray);
|
|
|
|
if(ray->t != 0.0f) {
|
|
/* Initialize throughput, L_transparent, Ray, PathState;
|
|
* These rays proceed with path-iteration.
|
|
*/
|
|
*throughput = make_float3(1.0f, 1.0f, 1.0f);
|
|
*L_transparent = 0.0f;
|
|
path_radiance_init(L, kernel_data.film.use_light_pass);
|
|
path_state_init(kg, state, rng, sample, ray);
|
|
#ifdef __KERNEL_DEBUG__
|
|
debug_data_init(debug_data);
|
|
#endif
|
|
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_REGENERATED);
|
|
enqueue_flag = 1;
|
|
} else {
|
|
/* These rays do not participate in path-iteration. */
|
|
float4 L_rad = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
/* Accumulate result in output buffer. */
|
|
kernel_write_pass_float4(per_sample_output_buffers, sample, L_rad);
|
|
path_rng_end(kg, rng_state, *rng);
|
|
|
|
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_TO_REGENERATE);
|
|
}
|
|
}
|
|
}
|
|
return enqueue_flag;
|
|
}
|