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/*
* Copyright 2011, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
CCL_NAMESPACE_BEGIN
/* Voronoi */
__device_noinline float4 svm_voronoi(NodeDistanceMetric distance_metric, NodeVoronoiColoring coloring,
float weight1, float weight2, float weight3, float weight4,
float exponent, float intensity, float size, float3 p)
{
float aw1 = fabsf(weight1);
float aw2 = fabsf(weight2);
float aw3 = fabsf(weight3);
float aw4 = fabsf(weight4);
float sc = (aw1 + aw2 + aw3 + aw4);
if(sc != 0.0f)
sc = intensity/sc;
/* compute distance and point coordinate of 4 nearest neighbours */
float da[4];
float3 pa[4];
voronoi(p/size, distance_metric, exponent, da, pa);
/* Scalar output */
float fac = sc * fabsf(weight1*da[0] + weight2*da[1] + weight3*da[2] + weight4*da[3]);
float3 color;
/* colored output */
if(coloring == NODE_VORONOI_INTENSITY) {
color = make_float3(fac, fac, fac);
}
else {
color = aw1*cellnoise_color(pa[0]);
color += aw2*cellnoise_color(pa[1]);
color += aw3*cellnoise_color(pa[2]);
color += aw4*cellnoise_color(pa[3]);
if(coloring != NODE_VORONOI_POSITION) {
float t1 = min((da[1] - da[0])*10.0f, 1.0f);
if(coloring == NODE_VORONOI_POSITION_OUTLINE_INTENSITY)
color *= t1*fac;
else if(coloring == NODE_VORONOI_POSITION_OUTLINE)
color *= t1*sc;
}
else {
color *= sc;
}
}
return make_float4(color.x, color.y, color.z, fac);
}
__device void svm_node_tex_voronoi(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, int *offset)
{
uint4 node2 = read_node(kg, offset);
uint4 node3 = read_node(kg, offset);
uint distance_metric, coloring, exponent_offset;
uint size_offset, co_offset, fac_offset, color_offset;
uint weight1_offset, weight2_offset, weight3_offset, weight4_offset;
decode_node_uchar4(node.y, &distance_metric, &coloring, &exponent_offset, NULL);
decode_node_uchar4(node.z, &size_offset, &co_offset, &fac_offset, &color_offset);
decode_node_uchar4(node.w, &weight1_offset, &weight2_offset, &weight3_offset, &weight4_offset);
float3 co = stack_load_float3(stack, co_offset);
float weight1 = stack_load_float_default(stack, weight1_offset, node2.x);
float weight2 = stack_load_float_default(stack, weight2_offset, node2.y);
float weight3 = stack_load_float_default(stack, weight3_offset, node2.z);
float weight4 = stack_load_float_default(stack, weight4_offset, node2.w);
float exponent = stack_load_float_default(stack, exponent_offset, node3.x);
float size = stack_load_float_default(stack, size_offset, node3.y);
exponent = fmaxf(exponent, 1e-5f);
size = nonzerof(size, 1e-5f);
float4 result = svm_voronoi((NodeDistanceMetric)distance_metric,
(NodeVoronoiColoring)coloring,
weight1, weight2, weight3, weight4, exponent, 1.0f, size, 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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