97 lines
2.7 KiB
Plaintext
97 lines
2.7 KiB
Plaintext
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Shader "Hidden/TerrainTools/SharpenPeaks"
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{
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Properties
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{
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_MainTex ("Texture", any) = "" {}
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}
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SubShader {
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ZTest Always Cull Off ZWrite Off
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Pass
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{
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Name "Ridge Erode"
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment Erode
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#include "UnityCG.cginc"
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#include "Packages/com.unity.terrain-tools/Shaders/TerrainTools.hlsl"
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sampler2D _MainTex;
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float4 _MainTex_TexelSize; // 1/width, 1/height, width, height
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sampler2D _BrushTex;
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sampler2D _FilterTex;
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float4 _BrushParams;
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#define BRUSH_STRENGTH (_BrushParams[0])
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#define EROSION_STRENGTH (_BrushParams[1])
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#define MIX_STRENGTH (_BrushParams[2])
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struct appdata_t {
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float4 vertex : POSITION;
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float2 pcUV : TEXCOORD0;
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};
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struct v2f {
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float4 vertex : SV_POSITION;
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float2 pcUV : TEXCOORD0;
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};
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v2f vert(appdata_t v)
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{
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.pcUV = v.pcUV;
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return o;
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}
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float4 Erode(v2f i) : SV_Target
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{
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float2 brushUV = PaintContextUVToBrushUV(i.pcUV);
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float2 heightmapUV = i.pcUV;
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const float2 coords [4] = { {-1,0}, { 1,0}, {0, -1}, { 0, 1} };
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float hc = UnpackHeightmap(tex2D(_MainTex, heightmapUV));
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float hl = UnpackHeightmap(tex2D(_MainTex, heightmapUV + coords[0] * _MainTex_TexelSize.xy));
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float hr = UnpackHeightmap(tex2D(_MainTex, heightmapUV + coords[1] * _MainTex_TexelSize.xy));
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float ht = UnpackHeightmap(tex2D(_MainTex, heightmapUV + coords[2] * _MainTex_TexelSize.xy));
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float hb = UnpackHeightmap(tex2D(_MainTex, heightmapUV + coords[3] * _MainTex_TexelSize.xy));
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float l = min(hl, hr);
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float r = max(hl, hr);
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float b = min(hb, ht);
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float t = max(hb, ht);
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float height = hc;
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if (height > l && height < r)
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{
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float hlr01 = pow((height - l) / (r - l), EROSION_STRENGTH);
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height = hlr01 * (r - l) + l;
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}
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if (height > b && height < t)
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{
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float hbt01 = pow((height - b) / (t - b), EROSION_STRENGTH);
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height = hbt01 * (t - b) + b;
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}
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height = lerp(0.25f * ( hl + hr + ht + hb ), height, MIX_STRENGTH);
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// out of bounds multiplier
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float oob = all(saturate(brushUV) == brushUV) ? 1.0f : 0.0f;
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float brushStrength = oob * BRUSH_STRENGTH * UnpackHeightmap(tex2D(_BrushTex, brushUV)) * UnpackHeightmap(tex2D(_FilterTex, i.pcUV));
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return clamp(lerp(hc, height, brushStrength), 0, 0.5f);
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}
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ENDCG
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}
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}
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Fallback Off
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}
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