intern/cycles/kernel/kernels/opencl/kernel_direct_lighting.cl

   1 /*
   2  * Copyright 2011-2015 Blender Foundation
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include "split/kernel_direct_lighting.h"
  18
  19 __kernel void kernel_ocl_path_trace_direct_lighting(
  20         ccl_global char *kg,
  21         ccl_constant KernelData *data,
  22         ccl_global char *sd,                    /* Required for direct lighting */
  23         ccl_global uint *rng_coop,              /* Required for direct lighting */
  24         ccl_global PathState *PathState_coop,   /* Required for direct lighting */
  25         ccl_global int *ISLamp_coop,            /* Required for direct lighting */
  26         ccl_global Ray *LightRay_coop,          /* Required for direct lighting */
  27         ccl_global BsdfEval *BSDFEval_coop,     /* Required for direct lighting */
  28         ccl_global char *ray_state,             /* Denotes the state of each ray */
  29         ccl_global int *Queue_data,             /* Queue memory */
  30         ccl_global int *Queue_index,            /* Tracks the number of elements in each queue */
  31         int queuesize)                          /* Size (capacity) of each queue */
  32 {
  33         ccl_local unsigned int local_queue_atomics;
  34         if(get_local_id(0) == 0 && get_local_id(1) == 0) {
  35                 local_queue_atomics = 0;
  36         }
  37         barrier(CLK_LOCAL_MEM_FENCE);
  38
  39         char enqueue_flag = 0;
  40         int ray_index = get_global_id(1) * get_global_size(0) + get_global_id(0);
  41         ray_index = get_ray_index(ray_index,
  42                                   QUEUE_ACTIVE_AND_REGENERATED_RAYS,
  43                                   Queue_data,
  44                                   queuesize,
  45                                   0);
  46
  47 #ifdef __COMPUTE_DEVICE_GPU__
  48         /* If we are executing on a GPU device, we exit all threads that are not
  49          * required.
  50          *
  51          * If we are executing on a CPU device, then we need to keep all threads
  52          * active since we have barrier() calls later in the kernel. CPU devices,
  53          * expect all threads to execute barrier statement.
  54          */
  55         if(ray_index == QUEUE_EMPTY_SLOT) {
  56                 return;
  57         }
  58 #endif
  59
  60 #ifndef __COMPUTE_DEVICE_GPU__
  61         if(ray_index != QUEUE_EMPTY_SLOT) {
  62 #endif
  63                 enqueue_flag = kernel_direct_lighting((KernelGlobals *)kg,
  64                                                       (ShaderData *)sd,
  65                                                       rng_coop,
  66                                                       PathState_coop,
  67                                                       ISLamp_coop,
  68                                                       LightRay_coop,
  69                                                       BSDFEval_coop,
  70                                                       ray_state,
  71                                                       ray_index);
  72
  73 #ifndef __COMPUTE_DEVICE_GPU__
  74         }
  75 #endif
  76
  77 #ifdef __EMISSION__
  78         /* Enqueue RAY_SHADOW_RAY_CAST_DL rays. */
  79         enqueue_ray_index_local(ray_index,
  80                                 QUEUE_SHADOW_RAY_CAST_DL_RAYS,
  81                                 enqueue_flag,
  82                                 queuesize,
  83                                 &local_queue_atomics,
  84                                 Queue_data,
  85                                 Queue_index);
  86 #endif
  87 }