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/*
* Copyright 2011-2013 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
/* Voronoi */
ccl_device_noinline float4 svm_voronoi(NodeVoronoiColoring coloring, float scale, float3 p)
{
/* compute distance and point coordinate of 4 nearest neighbours */
float4 dpa0 = voronoi_Fn(p*scale, 1.0f, 0, -1);
/* output */
float fac;
float3 color;
if(coloring == NODE_VORONOI_INTENSITY) {
fac = fabsf(dpa0.w);
color = make_float3(fac, fac, fac);
}
else {
color = cellnoise_color(float4_to_float3(dpa0));
fac = average(color);
}
return make_float4(color.x, color.y, color.z, fac);
}
ccl_device void svm_node_tex_voronoi(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
uint coloring = node.y;
uint scale_offset, co_offset, fac_offset, color_offset;
decode_node_uchar4(node.z, &scale_offset, &co_offset, &fac_offset, &color_offset);
float3 co = stack_load_float3(stack, co_offset);
float scale = stack_load_float_default(stack, scale_offset, node.w);
float4 result = svm_voronoi((NodeVoronoiColoring)coloring, scale, co);
float3 color = make_float3(result.x, result.y, result.z);
float f = result.w;
if(stack_valid(fac_offset)) stack_store_float(stack, fac_offset, f);
if(stack_valid(color_offset)) stack_store_float3(stack, color_offset, color);
}
CCL_NAMESPACE_END
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