42 lines
973 B
HLSL
42 lines
973 B
HLSL
#ifndef VOLUMETRIC_FOG_2_FOG_VOIDS
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#define VOLUMETRIC_FOG_2_FOG_VOIDS
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#define FOG_MAX_VOID 8
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CBUFFER_START(VolumetricFog2FogVoidBuffers)
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float4 _VF2_FogVoidPositions[FOG_MAX_VOID];
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float4 _VF2_FogVoidSizes[FOG_MAX_VOID];
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int _VF2_FogVoidCount;
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CBUFFER_END
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half ApplyFogVoids(float3 wpos) {
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float sdf = 10.0;
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for (int k=0;k<_VF2_FogVoidCount;k++) {
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// sqr distance to void center
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float3 vd = _VF2_FogVoidPositions[k].xyz - wpos.xyz;
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vd *= vd;
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// relative to void size
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vd *= _VF2_FogVoidSizes[k].xyz;
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// rect
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float rect = max(vd.x, max(vd.y, vd.z));
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// circle
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float circ = vd.x + vd.y + vd.z;
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// roundness
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float voidd = lerp(rect, circ, _VF2_FogVoidSizes[k].w);
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// falloff
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voidd = lerp(1.0, voidd, _VF2_FogVoidPositions[k].w);
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// merge sdf
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sdf = min(sdf, voidd);
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}
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sdf = 1.0 - sdf;
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return saturate(sdf);
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}
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#endif |