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/*
* 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_shader_eval kernel
* This kernel is the 5th kernel in the ray tracing logic. This is
* the 4rd kernel in path iteration. This kernel sets up the ShaderData
* structure from the values computed by the previous kernels. It also identifies
* the rays of state RAY_TO_REGENERATE and enqueues them in QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue.
*
* The input and output of the kernel is as follows,
* rng_coop -------------------------------------------|--- kernel_shader_eval --|--- shader_data
* Ray_coop -------------------------------------------| |--- Queue_data (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
* PathState_coop -------------------------------------| |--- Queue_index (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
* Intersection_coop ----------------------------------| |
* Queue_data (QUEUE_ACTIVE_AND_REGENERATD_RAYS)-------| |
* Queue_index(QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)---| |
* ray_state ------------------------------------------| |
* kg (globals + data) --------------------------------| |
* queuesize ------------------------------------------| |
*
* Note on Queues :
* This kernel reads from the QUEUE_ACTIVE_AND_REGENERATED_RAYS queue and processes
* only the rays of state RAY_ACTIVE;
* State of queues when this kernel is called,
* at entry,
* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE and RAY_REGENERATED rays
* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be empty.
* 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 filled with RAY_TO_REGENERATE rays
*/
__kernel void kernel_shader_eval(
ccl_global char *globals,
ccl_constant KernelData *data,
ccl_global char *shader_data, /* Output ShaderData structure to be filled */
ccl_global uint *rng_coop, /* Required for rbsdf calculation */
ccl_global Ray *Ray_coop, /* Required for setting up shader from ray */
ccl_global PathState *PathState_coop, /* Required for all functions in this kernel */
Intersection *Intersection_coop, /* Required for setting up shader from ray */
ccl_global char *ray_state, /* Denotes the state of each ray */
ccl_global int *Queue_data, /* queue memory */
ccl_global int *Queue_index, /* Tracks the number of elements in each queue */
int queuesize /* Size (capacity) of each queue */
)
{
int ray_index = get_global_id(1) * get_global_size(0) + get_global_id(0);
/* Enqeueue RAY_TO_REGENERATE rays into QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue */
ccl_local unsigned int local_queue_atomics;
if(get_local_id(0) == 0 && get_local_id(1) == 0) {
local_queue_atomics = 0;
}
barrier(CLK_LOCAL_MEM_FENCE);
char enqueue_flag = (IS_STATE(ray_state, ray_index, RAY_TO_REGENERATE)) ? 1 : 0;
enqueue_ray_index_local(ray_index, QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS, enqueue_flag, queuesize, &local_queue_atomics, Queue_data, Queue_index);
ray_index = get_ray_index(ray_index, QUEUE_ACTIVE_AND_REGENERATED_RAYS, Queue_data, queuesize, 0);
if(ray_index == QUEUE_EMPTY_SLOT)
return;
/* Continue on with shader evaluation */
if(IS_STATE(ray_state, ray_index, RAY_ACTIVE)) {
KernelGlobals *kg = (KernelGlobals *)globals;
ShaderData *sd = (ShaderData *)shader_data;
Intersection *isect = &Intersection_coop[ray_index];
ccl_global uint *rng = &rng_coop[ray_index];
ccl_global PathState *state = &PathState_coop[ray_index];
Ray ray = Ray_coop[ray_index];
shader_setup_from_ray(kg, sd, isect, &ray, state->bounce, state->transparent_bounce);
float rbsdf = path_state_rng_1D_for_decision(kg, rng, state, PRNG_BSDF);
shader_eval_surface(kg, sd, rbsdf, state->flag, SHADER_CONTEXT_MAIN);
}
}
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