114 lines
4.0 KiB
Plaintext
114 lines
4.0 KiB
Plaintext
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Shader "Hidden/Griffin/TerrainNormalMapRenderer"
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{
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Properties
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{
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_HeightMap("Height Map", 2D) = "black" {}
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_Width("Width", Float) = 0
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_Height("Height", Float) = 0
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_Length("Length", Float) = 0
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_TangentSpace("Tangent Space", Int) = 0
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}
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SubShader
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{
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Tags { "RenderType"="Transparent" }
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Blend One Zero
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Pass
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{
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CGPROGRAM
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#pragma vertex vert
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#pragma fragment frag
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#include "UnityCG.cginc"
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#include "TextureToolCommon.cginc"
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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struct v2f
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{
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float4 vertex : SV_POSITION;
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float2 uv : TEXCOORD0;
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};
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sampler2D _HeightMap;
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float4 _HeightMap_TexelSize;
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float _Width;
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float _Height;
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float _Length;
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int _TangentSpace;
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v2f vert (appdata 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.uv = v.uv;
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return o;
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}
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float4 frag (v2f i) : SV_Target
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{
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float2 texel = _HeightMap_TexelSize.xy;
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float2 uvLeft = i.uv - float2(texel.x, 0);
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float2 uvUp = i.uv + float2(0, texel.y);
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float2 uvRight = i.uv + float2(texel.x, 0);
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float2 uvDown = i.uv - float2(0, texel.y);
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float2 uvCenter = i.uv;
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float2 uvLeftUp = i.uv - float2(texel.x, 0) + float2(0, texel.y);
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float2 uvUpRight = i.uv + float2(0, texel.y) + float2(texel.x, 0);
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float2 uvRightDown = i.uv + float2(texel.x, 0) - float2(0, texel.y);
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float2 uvDownLeft = i.uv - float2(0, texel.y) - float2(texel.x, 0);
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float leftHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvLeft).rg)*_Height;
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float upHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvUp).rg) *_Height;
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float rightHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvRight).rg) *_Height;
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float downHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvDown).rg) *_Height;
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float centerHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvCenter).rg) *_Height;
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float leftUpHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvLeftUp).rg) *_Height;
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float upRightHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvUpRight).rg) *_Height;
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float rightDownHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvRightDown).rg) *_Height;
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float downLeftHeight = GriffinDecodeFloatRG(tex2D(_HeightMap, uvDownLeft).rg) *_Height;
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float3 left = float3(_Width*uvLeft.x, leftHeight, _Length*uvLeft.y);
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float3 up = float3(_Width*uvUp.x, leftHeight, _Length*uvUp.y);
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float3 right = float3(_Width*uvRight.x, leftHeight, _Length*uvRight.y);
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float3 down = float3(_Width*uvDown.x, leftHeight, _Length*uvDown.y);
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float3 center = float3(_Width*uvCenter.x, centerHeight, _Length*uvCenter.y);
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float3 leftUp = float3(_Width*uvLeftUp.x, leftUpHeight, _Length*uvLeftUp.y);
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float3 upRight = float3(_Width*uvUpRight.x, upRightHeight, _Length*uvUpRight.y);
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float3 rightDown = float3(_Width*uvRightDown.x, rightDownHeight, _Length*uvRightDown.y);
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float3 downLeft = float3(_Width*uvDownLeft.x, downLeftHeight, _Length*uvDownLeft.y);
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float3 n0 = cross(left-center, leftUp-center);
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float3 n1 = cross(up-center, upRight-center);
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float3 n2 = cross(right-center, rightDown-center);
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float3 n3 = cross(down-center, downLeft-center);
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float3 n4 = cross(leftUp-center, up-center);
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float3 n5 = cross(upRight-center, right-center);
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float3 n6 = cross(rightDown-center, down-center);
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float3 n7 = cross(downLeft-center, left-center);
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float3 nc = (n0+n1+n2+n3+n4+n5+n6+n7)/8;
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float3 n = _TangentSpace*float3(nc.x, nc.z, nc.y) + (1-_TangentSpace)*nc;
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float3 normal = normalize(n);
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float3 col = float3(
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(normal.x + 1)/2,
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(normal.y + 1)/2,
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(normal.z + 1)/2);
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#ifdef UNITY_COLORSPACE_GAMMA
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return float4(col,1);
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#else
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return float4(GammaToLinearSpace(col.rgb), 1);
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#endif
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}
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ENDCG
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}
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}
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}
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