intern/cycles/kernel/closure/alloc.h

   1 /*
   2  * Copyright 2011-2016 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 CCL_NAMESPACE_BEGIN
  18
  19 ccl_device ShaderClosure *closure_alloc(ShaderData *sd, int size, ClosureType type, float3 weight)
  20 {
  21         kernel_assert(size <= sizeof(ShaderClosure));
  22
  23         if(sd->num_closure_left == 0)
  24                 return NULL;
  25
  26         ShaderClosure *sc = &sd->closure[sd->num_closure];
  27
  28         sc->type = type;
  29         sc->weight = weight;
  30
  31         sd->num_closure++;
  32         sd->num_closure_left--;
  33
  34         return sc;
  35 }
  36
  37 ccl_device ccl_addr_space void *closure_alloc_extra(ShaderData *sd, int size)
  38 {
  39         /* Allocate extra space for closure that need more parameters. We allocate
  40          * in chunks of sizeof(ShaderClosure) starting from the end of the closure
  41          * array.
  42          *
  43          * This lets us keep the same fast array iteration over closures, as we
  44          * found linked list iteration and iteration with skipping to be slower. */
  45         int num_extra = ((size + sizeof(ShaderClosure) - 1) / sizeof(ShaderClosure));
  46
  47         if(num_extra > sd->num_closure_left) {
  48                 /* Remove previous closure if it was allocated. */
  49                 sd->num_closure--;
  50                 sd->num_closure_left++;
  51                 return NULL;
  52         }
  53
  54         sd->num_closure_left -= num_extra;
  55         return (ccl_addr_space void*)(sd->closure + sd->num_closure + sd->num_closure_left);
  56 }
  57
  58 ccl_device_inline ShaderClosure *bsdf_alloc(ShaderData *sd, int size, float3 weight)
  59 {
  60         ShaderClosure *sc = closure_alloc(sd, size, CLOSURE_NONE_ID, weight);
  61
  62         if(sc == NULL)
  63                 return NULL;
  64
  65         float sample_weight = fabsf(average(weight));
  66         sc->sample_weight = sample_weight;
  67         return (sample_weight >= CLOSURE_WEIGHT_CUTOFF) ? sc : NULL;
  68 }
  69
  70 #ifdef __OSL__
  71 ccl_device_inline ShaderClosure *bsdf_alloc_osl(ShaderData *sd, int size, float3 weight, void *data)
  72 {
  73         ShaderClosure *sc = closure_alloc(sd, size, CLOSURE_NONE_ID, weight);
  74
  75         if(!sc)
  76                 return NULL;
  77
  78         memcpy(sc, data, size);
  79
  80         float sample_weight = fabsf(average(weight));
  81         sc->weight = weight;
  82         sc->sample_weight = sample_weight;
  83         return (sample_weight >= CLOSURE_WEIGHT_CUTOFF) ? sc : NULL;
  84 }
  85 #endif
  86
  87 CCL_NAMESPACE_END