alloc.h

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/*
 * Copyright 2011-2016 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
 
ccl_device ShaderClosure *closure_alloc(ShaderData *sd, int size, ClosureType type, float3 weight)
{
  kernel_assert(size <= sizeof(ShaderClosure));
 
  if (sd->num_closure_left == 0)
    return NULL;
 
  ShaderClosure *sc = &sd->closure[sd->num_closure];
 
  sc->type = type;
  sc->weight = weight;
 
  sd->num_closure++;
  sd->num_closure_left--;
 
  return sc;
}
 
ccl_device ccl_addr_space void *closure_alloc_extra(ShaderData *sd, int size)
{
  /* Allocate extra space for closure that need more parameters. We allocate
   * in chunks of sizeof(ShaderClosure) starting from the end of the closure
   * array.
   *
   * This lets us keep the same fast array iteration over closures, as we
   * found linked list iteration and iteration with skipping to be slower. */
  int num_extra = ((size + sizeof(ShaderClosure) - 1) / sizeof(ShaderClosure));
 
  if (num_extra > sd->num_closure_left) {
    /* Remove previous closure if it was allocated. */
    sd->num_closure--;
    sd->num_closure_left++;
    return NULL;
  }
 
  sd->num_closure_left -= num_extra;
  return (ccl_addr_space void *)(sd->closure + sd->num_closure + sd->num_closure_left);
}
 
ccl_device_inline ShaderClosure *bsdf_alloc(ShaderData *sd, int size, float3 weight)
{
  kernel_assert(isfinite3_safe(weight));
 
  const float sample_weight = fabsf(average(weight));
 
  /* Use comparison this way to help dealing with non-finite weight: if the average is not finite
   * we will not allocate new closure. */
  if (sample_weight >= CLOSURE_WEIGHT_CUTOFF) {
    ShaderClosure *sc = closure_alloc(sd, size, CLOSURE_NONE_ID, weight);
    if (sc == NULL) {
      return NULL;
    }
 
    sc->sample_weight = sample_weight;
 
    return sc;
  }
 
  return NULL;
}
 
#ifdef __OSL__
ccl_device_inline ShaderClosure *bsdf_alloc_osl(ShaderData *sd,
                                                int size,
                                                float3 weight,
                                                void *data)
{
  kernel_assert(isfinite3_safe(weight));
 
  const float sample_weight = fabsf(average(weight));
 
  /* Use comparison this way to help dealing with non-finite weight: if the average is not finite
   * we will not allocate new closure. */
  if (sample_weight >= CLOSURE_WEIGHT_CUTOFF) {
    ShaderClosure *sc = closure_alloc(sd, size, CLOSURE_NONE_ID, weight);
    if (!sc) {
      return NULL;
    }
 
    memcpy((void *)sc, data, size);
 
    sc->weight = weight;
    sc->sample_weight = sample_weight;
 
    return sc;
  }
 
  return NULL;
}
#endif
 
CCL_NAMESPACE_END