1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/*
* 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
/* 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 --|--- sd
* 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) ---------------------------------------| |
* 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(KernelGlobals *kg)
{
/* Enqeueue RAY_TO_REGENERATE rays into QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue. */
ccl_local unsigned int local_queue_atomics;
if(ccl_local_id(0) == 0 && ccl_local_id(1) == 0) {
local_queue_atomics = 0;
}
ccl_barrier(CCL_LOCAL_MEM_FENCE);
int ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
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;
}
char enqueue_flag = (IS_STATE(kernel_split_state.ray_state, ray_index, RAY_TO_REGENERATE)) ? 1 : 0;
enqueue_ray_index_local(ray_index,
QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS,
enqueue_flag,
kernel_split_params.queue_size,
&local_queue_atomics,
kernel_split_state.queue_data,
kernel_split_params.queue_index);
/* Continue on with shader evaluation. */
if(IS_STATE(kernel_split_state.ray_state, ray_index, RAY_ACTIVE)) {
Intersection isect = kernel_split_state.isect[ray_index];
ccl_global uint *rng = &kernel_split_state.rng[ray_index];
ccl_global PathState *state = &kernel_split_state.path_state[ray_index];
Ray ray = kernel_split_state.ray[ray_index];
shader_setup_from_ray(kg,
&kernel_split_state.sd[ray_index],
&isect,
&ray);
float rbsdf = path_state_rng_1D_for_decision(kg, rng, state, PRNG_BSDF);
shader_eval_surface(kg, &kernel_split_state.sd[ray_index], rng, state, rbsdf, state->flag, SHADER_CONTEXT_MAIN);
}
}
CCL_NAMESPACE_END
|
