74 lines
2.2 KiB
HLSL
74 lines
2.2 KiB
HLSL
inline float2 voronoi_noise_randomVector (float2 UV, float offset){
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float2x2 m = float2x2(15.27, 47.63, 99.41, 89.98);
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UV = frac(sin(mul(UV, m)) * 46839.32);
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return float2(sin(UV.y*+offset)*0.5+0.5, cos(UV.x*offset)*0.5+0.5);
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}
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void VoronoiPrecise2D_float(float2 UV, float AngleOffset, float CellDensity, out float Out, out float Cells) {
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float2 g = floor(UV * CellDensity);
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float2 f = frac(UV * CellDensity);
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float2 res = float2(8.0, 8.0);
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float2 ml = float2(0,0);
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float2 mv = float2(0,0);
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for(int y=-1; y<=1; y++){
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for(int x=-1; x<=1; x++){
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float2 lattice = float2(x, y);
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float2 offset = voronoi_noise_randomVector(g + lattice, AngleOffset);
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float2 v = lattice + offset - f;
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float d = dot(v, v);
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if(d < res.x){
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res.x = d;
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res.y = offset.x;
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mv = v;
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ml = lattice;
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}
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}
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}
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Cells = res.y;
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res = float2(8.0, 8.0);
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for(int y1=-2; y1<=2; y1++){
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for(int x1=-2; x1<=2; x1++){
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float2 lattice = ml + float2(x1, y1);
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float2 offset = voronoi_noise_randomVector(g + lattice, AngleOffset);
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float2 v = lattice + offset - f;
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float2 cellDifference = abs(ml - lattice);
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if (cellDifference.x + cellDifference.y > 0.1){
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float d = dot(0.5*(mv+v), normalize(v-mv));
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res.x = min(res.x, d);
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}
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}
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}
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Out = res.x;
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}
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void Voronoi2D_float(float2 UV, float AngleOffset, float CellDensity, out float Out, out float Cells) {
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float2 g = floor(UV * CellDensity);
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float2 f = frac(UV * CellDensity);
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float3 res = float3(8.0, 8.0, 8.0);
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for(int y=-1; y<=1; y++){
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for(int x=-1; x<=1; x++){
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float2 lattice = float2(x, y);
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float2 offset = voronoi_noise_randomVector(g + lattice, AngleOffset);
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float2 v = lattice + offset - f;
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float d = dot(v, v);
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if(d < res.x){
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res.y = res.x;
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res.x = d;
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res.z = offset.x;
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}else if (d < res.y){
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res.y = d;
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}
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}
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}
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Out = res.x;
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Cells = res.z;
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} |