svm_voxel.h

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/*
 * 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
 
/* TODO(sergey): Think of making it more generic volume-type attribute
 * sampler.
 */
ccl_device void svm_node_tex_voxel(
    KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
  uint co_offset, density_out_offset, color_out_offset, space;
  svm_unpack_node_uchar4(node.z, &co_offset, &density_out_offset, &color_out_offset, &space);
#ifdef __VOLUME__
  int id = node.y;
  float3 co = stack_load_float3(stack, co_offset);
  if (space == NODE_TEX_VOXEL_SPACE_OBJECT) {
    co = volume_normalized_position(kg, sd, co);
  }
  else {
    kernel_assert(space == NODE_TEX_VOXEL_SPACE_WORLD);
    Transform tfm;
    tfm.x = read_node_float(kg, offset);
    tfm.y = read_node_float(kg, offset);
    tfm.z = read_node_float(kg, offset);
    co = transform_point(&tfm, co);
  }
 
  float4 r = kernel_tex_image_interp_3d(kg, id, co, INTERPOLATION_NONE);
#else
  float4 r = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
#endif
  if (stack_valid(density_out_offset))
    stack_store_float(stack, density_out_offset, r.w);
  if (stack_valid(color_out_offset))
    stack_store_float3(stack, color_out_offset, make_float3(r.x, r.y, r.z));
}
 
CCL_NAMESPACE_END