95 lines
2.0 KiB
Plaintext
95 lines
2.0 KiB
Plaintext
Shader "Unlit/Corner"
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{
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Properties
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{
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_MainTex ("Texture", 2D) = "white" {}
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}
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SubShader
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{
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Tags { "RenderType"="Opaque" }
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LOD 100
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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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// make fog work
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#pragma multi_compile_fog
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#include "UnityCG.cginc"
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struct appdata{
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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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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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};
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sampler2D _MainTex;
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float4 _MainTex_ST;
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v2f vert (appdata v){
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v2f o;
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o.vertex = UnityObjectToClipPos(v.vertex);
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o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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return o;
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}
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static const float3x3 sobelX = float3x3(
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float3(-1, 0, 1),
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float3(-2, 0, 2),
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float3(-1, 0, 1)
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);
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static const float3x3 sobelY = float3x3(
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float3(-1, -2, -1),
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float3(0, 0, 0),
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float3(1, 2, 1)
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);
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float sobelFilter(sampler2D image, float2 uv, float3x3 kernel) {
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float2 textureSize = float2(512, 512);
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float sum = 0.0f;
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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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sum += tex2D(image, uv + float2((float)x / textureSize.x, (float)y / textureSize.y)).r * kernel[y + 1][x + 1];
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}
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}
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return sum;
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}
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float4 frag (v2f i) : SV_Target{
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float2 textureSize = float2(512,512);
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float2 texelSize = 1.0f / textureSize;
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float Ix = tex2D(_MainTex, i.uv + float2(texelSize.x, 0.0f)).r - tex2D(_MainTex, i.uv).r;
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float Iy = tex2D(_MainTex, i.uv + float2(0.0f, texelSize.y)).r - tex2D(_MainTex, i.uv).r;
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float2x2 jacobi;
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jacobi[0][0] = Ix * Ix;
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jacobi[0][1] = Ix * Iy;
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jacobi[1][0] = Ix * Iy;
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jacobi[1][1] = Iy * Iy;
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float jacobian = (Ix * Ix) * (Iy * Iy) - (Ix * Iy) * (Ix * Iy);
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//return tex2D(_MainTex, i.uv).r;
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float sX = sobelFilter(_MainTex, i.uv, sobelX);
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float sY = sobelFilter(_MainTex, i.uv, sobelY);
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//return sX;
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return sY;
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return sX*sX + sY*sY;
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//return jacobian == 0;
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//return abs(float4(Ix, Iy, 0, 1));
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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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