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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 float voronoi_F1_distance(float3 p)
{
/* returns squared distance in da */
float da = 1e10f;
#ifndef __KERNEL_SSE2__
int ix = floor_to_int(p.x), iy = floor_to_int(p.y), iz = floor_to_int(p.z);
for(int xx = -1; xx <= 1; xx++) {
for(int yy = -1; yy <= 1; yy++) {
for(int zz = -1; zz <= 1; zz++) {
float3 ip = make_float3(ix + xx, iy + yy, iz + zz);
float3 vp = ip + cellnoise_color(ip);
float d = len_squared(p - vp);
da = min(d, da);
}
}
}
#else
ssef vec_p = load4f(p);
ssei xyzi = quick_floor_sse(vec_p);
for(int xx = -1; xx <= 1; xx++) {
for(int yy = -1; yy <= 1; yy++) {
for(int zz = -1; zz <= 1; zz++) {
ssef ip = ssef(xyzi + ssei(xx, yy, zz, 0));
ssef vp = ip + cellnoise_color(ip);
float d = len_squared<1, 1, 1, 0>(vec_p - vp);
da = min(d, da);
}
}
}
#endif
return da;
}
ccl_device float3 voronoi_F1_color(float3 p)
{
/* returns color of the nearest point */
float da = 1e10f;
#ifndef __KERNEL_SSE2__
float3 pa;
int ix = floor_to_int(p.x), iy = floor_to_int(p.y), iz = floor_to_int(p.z);
for(int xx = -1; xx <= 1; xx++) {
for(int yy = -1; yy <= 1; yy++) {
for(int zz = -1; zz <= 1; zz++) {
float3 ip = make_float3(ix + xx, iy + yy, iz + zz);
float3 vp = ip + cellnoise_color(ip);
float d = len_squared(p - vp);
if(d < da) {
da = d;
pa = vp;
}
}
}
}
return cellnoise_color(pa);
#else
ssef pa, vec_p = load4f(p);
ssei xyzi = quick_floor_sse(vec_p);
for(int xx = -1; xx <= 1; xx++) {
for(int yy = -1; yy <= 1; yy++) {
for(int zz = -1; zz <= 1; zz++) {
ssef ip = ssef(xyzi + ssei(xx, yy, zz, 0));
ssef vp = ip + cellnoise_color(ip);
float d = len_squared<1, 1, 1, 0>(vec_p - vp);
if(d < da) {
da = d;
pa = vp;
}
}
}
}
ssef color = cellnoise_color(pa);
return (float3 &)color;
#endif
}
ccl_device_noinline float4 svm_voronoi(NodeVoronoiColoring coloring, float3 p)
{
if(coloring == NODE_VORONOI_INTENSITY) {
/* compute squared distance to the nearest neighbour */
float fac = voronoi_F1_distance(p);
return make_float4(fac, fac, fac, fac);
}
else {
/* compute color of the nearest neighbour */
float3 color = voronoi_F1_color(p);
return make_float4(color.x, color.y, color.z, average(color));
}
}
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, co*scale);
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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