forked from bartvdbraak/blender
111 lines
3.6 KiB
C
111 lines
3.6 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.
|
|
*/
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
/* This kernel takes care of scene_intersect function.
|
|
*
|
|
* This kernel changes the ray_state of RAY_REGENERATED rays to RAY_ACTIVE.
|
|
* This kernel processes rays of ray state RAY_ACTIVE
|
|
* This kernel determines the rays that have hit the background and changes
|
|
* their ray state to RAY_HIT_BACKGROUND.
|
|
*/
|
|
ccl_device void kernel_scene_intersect(KernelGlobals *kg)
|
|
{
|
|
/* Fetch use_queues_flag */
|
|
ccl_local char local_use_queues_flag;
|
|
if(ccl_local_id(0) == 0 && ccl_local_id(1) == 0) {
|
|
local_use_queues_flag = *kernel_split_params.use_queues_flag;
|
|
}
|
|
ccl_barrier(CCL_LOCAL_MEM_FENCE);
|
|
|
|
int ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
|
|
if(local_use_queues_flag) {
|
|
ray_index = get_ray_index(kg, ray_index,
|
|
QUEUE_ACTIVE_AND_REGENERATED_RAYS,
|
|
kernel_split_state.queue_data,
|
|
kernel_split_params.queue_size,
|
|
0);
|
|
|
|
if(ray_index == QUEUE_EMPTY_SLOT) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* All regenerated rays become active here */
|
|
if(IS_STATE(kernel_split_state.ray_state, ray_index, RAY_REGENERATED))
|
|
ASSIGN_RAY_STATE(kernel_split_state.ray_state, ray_index, RAY_ACTIVE);
|
|
|
|
if(!IS_STATE(kernel_split_state.ray_state, ray_index, RAY_ACTIVE))
|
|
return;
|
|
|
|
#ifdef __KERNEL_DEBUG__
|
|
DebugData *debug_data = &kernel_split_state.debug_data[ray_index];
|
|
#endif
|
|
Intersection isect;
|
|
PathState state = kernel_split_state.path_state[ray_index];
|
|
Ray ray = kernel_split_state.ray[ray_index];
|
|
|
|
/* intersect scene */
|
|
uint visibility = path_state_ray_visibility(kg, &state);
|
|
|
|
#ifdef __HAIR__
|
|
float difl = 0.0f, extmax = 0.0f;
|
|
uint lcg_state = 0;
|
|
RNG rng = kernel_split_state.rng[ray_index];
|
|
|
|
if(kernel_data.bvh.have_curves) {
|
|
if((kernel_data.cam.resolution == 1) && (state.flag & PATH_RAY_CAMERA)) {
|
|
float3 pixdiff = ray.dD.dx + ray.dD.dy;
|
|
/*pixdiff = pixdiff - dot(pixdiff, ray.D)*ray.D;*/
|
|
difl = kernel_data.curve.minimum_width * len(pixdiff) * 0.5f;
|
|
}
|
|
|
|
extmax = kernel_data.curve.maximum_width;
|
|
lcg_state = lcg_state_init(&rng, &state, 0x51633e2d);
|
|
}
|
|
|
|
if(state.bounce > kernel_data.integrator.ao_bounces) {
|
|
visibility = PATH_RAY_SHADOW;
|
|
ray.t = kernel_data.background.ao_distance;
|
|
}
|
|
|
|
bool hit = scene_intersect(kg, ray, visibility, &isect, &lcg_state, difl, extmax);
|
|
#else
|
|
bool hit = scene_intersect(kg, ray, visibility, &isect, NULL, 0.0f, 0.0f);
|
|
#endif
|
|
kernel_split_state.isect[ray_index] = isect;
|
|
|
|
#ifdef __KERNEL_DEBUG__
|
|
if(state.flag & PATH_RAY_CAMERA) {
|
|
debug_data->num_bvh_traversed_nodes += isect.num_traversed_nodes;
|
|
debug_data->num_bvh_traversed_instances += isect.num_traversed_instances;
|
|
debug_data->num_bvh_intersections += isect.num_intersections;
|
|
}
|
|
debug_data->num_ray_bounces++;
|
|
#endif
|
|
|
|
if(!hit) {
|
|
/* Change the state of rays that hit the background;
|
|
* These rays undergo special processing in the
|
|
* background_bufferUpdate kernel.
|
|
*/
|
|
ASSIGN_RAY_STATE(kernel_split_state.ray_state, ray_index, RAY_HIT_BACKGROUND);
|
|
}
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|