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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
*/
ccl_device 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 */
int ray_index)
{
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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