69 lines
2.0 KiB
HLSL
69 lines
2.0 KiB
HLSL
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#ifndef TERRAIN_TOOLS_INC
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#define TERRAIN_TOOLS_INC
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#include "TerrainTool.cginc"
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/*=================================================================================================
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Domain Conversion
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=================================================================================================*/
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float4 _PcUvVectors; // xy = offset, zw = dimensions in uv space relative to the target heightmap dimensions
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float4 _PcPixelRect;
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float2 PcUvToHeightmapUv(float2 pcUV)
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{
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return _PcUvVectors.xy + pcUV * _PcUvVectors.zw;
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}
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float2 HeightmapUvToPcUv(float2 heightmapUV)
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{
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return (heightmapUV - _PcUvVectors.xy) / _PcUvVectors.zw;
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}
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/*=================================================================================================
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Texel Validity
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=================================================================================================*/
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sampler2D _PCValidityTex;
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float4 _PCValidityTex_TexelSize;
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float IsPcUvPartOfValidTerrainTileTexel(float2 pcUV)
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{
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return sign(max(0, tex2D(_PCValidityTex, pcUV).r));
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}
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float IsPcUvPartOfValidTerrainTileTexelSobel(float2 pcUV, float2 offset)
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{
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float3 offsets = float3(offset.x, offset.y, 0);
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float t = tex2D(_PCValidityTex, pcUV).r;
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t += tex2D(_PCValidityTex, pcUV - offsets.xz).r;
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t += tex2D(_PCValidityTex, pcUV + offsets.xz).r;
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t += tex2D(_PCValidityTex, pcUV - offsets.zy).r;
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t += tex2D(_PCValidityTex, pcUV + offsets.zy).r;
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return sign(max(0, t - 4));
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}
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/*=================================================================================================
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Filters
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=================================================================================================*/
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float2 _PrevFilterRange;
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float2 _FilterRange;
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inline float RemapFilterValue( float4 n, float o, float p, float a, float b )
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{
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return a.xxxx + (b.xxxx - a.xxxx) * (n - o.xxxx) / (p.xxxx - o.xxxx);
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}
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inline float pow_keep_sign( float4 f, float p )
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{
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return pow( abs( f ), p ) * sign( f );
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}
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#endif
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