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120 lines
3.4 KiB
120 lines
3.4 KiB
Shader "Hidden/ScreenHomography"
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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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ZTest Always Cull Off ZWrite Off
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Fog { Mode off }
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CGINCLUDE
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#pragma fragmentoption ARB_precision_hint_fastest
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#include "UnityCG.cginc"
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float4x4 matrixHomo;
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float4 textureSize;
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sampler2D _MainTex;
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float3 blend_color;
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float amount;
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float Triangular(float f)
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{
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f = f / 2.0;
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if (f < 0.0)
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{
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return (f + 1.0);
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}
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else
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{
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return (1.0 - f);
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}
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return 0.0;
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}
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float4 getColor(sampler2D textureSampler, float2 TexCoord)
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{
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float4 homo = mul(matrixHomo, float4(TexCoord, 0.0f, 1.0f));
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float2 tex_coord = homo.xy / homo.w;
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if (tex_coord.x < 0.0f || tex_coord.x > 1.0f || tex_coord.y < 0.0f || tex_coord.y > 1.0f)
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return float4(0, 0, 0, 1);
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else
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return tex2D(textureSampler, tex_coord);
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}
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float4 BiCubic(sampler2D textureSampler, float2 TexCoord)
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{
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float fWidth = textureSize.x;
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float fHeight = textureSize.y;
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float texelSizeX = 1.0 / fWidth; //size of one texel
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float texelSizeY = 1.0 / fHeight; //size of one texel
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float4 nSum = float4(0.0, 0.0, 0.0, 0.0);
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float4 nDenom = float4(0.0, 0.0, 0.0, 0.0);
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float a = frac(TexCoord.x * fWidth); // get the decimal part
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float b = frac(TexCoord.y * fHeight); // get the decimal part
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for (int m = -1; m <= 2; m++)
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{
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for (int n = -1; n <= 2; n++)
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{
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float4 vecData = getColor(textureSampler,
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TexCoord + float2(texelSizeX * float(m),
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texelSizeY * float(n)));
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float f = Triangular(float(m) - a);
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float4 vecCooef1 = float4(f, f, f, f);
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float f1 = Triangular(-(float(n) - b));
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float4 vecCoeef2 = float4(f1, f1, f1, f1);
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nSum = nSum + (vecData * vecCoeef2 * vecCooef1);
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nDenom = nDenom + ((vecCoeef2 * vecCooef1));
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}
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}
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return nSum / nDenom;
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}
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float4 BiLinear(sampler2D textureSampler, float2 TexCoord)
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{
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float fWidth = textureSize.x;
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float fHeight = textureSize.y;
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float texelSizeX = 1.0 / fWidth; //size of one texel
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float texelSizeY = 1.0 / fHeight; //size of one texel
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float4 p0q0 = getColor(textureSampler, TexCoord);
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float4 p1q0 = getColor(textureSampler, TexCoord + float2(texelSizeX, 0));
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float4 p0q1 = getColor(textureSampler, TexCoord + float2(0, texelSizeY));
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float4 p1q1 = getColor(textureSampler, TexCoord + float2(texelSizeX, texelSizeY));
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float a = frac(TexCoord.x * fWidth); // Get Interpolation factor for X direction.
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// Fraction near to valid data.
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float4 pInterp_q0 = lerp(p0q0, p1q0, a); // Interpolates top row in X direction.
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float4 pInterp_q1 = lerp(p0q1, p1q1, a); // Interpolates bottom row in X direction.
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float b = frac(TexCoord.y * fHeight);// Get Interpolation factor for Y direction.
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return lerp(pInterp_q0, pInterp_q1, b); // Interpolate in Y direction.
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}
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float4 frag(v2f_img i) : SV_Target
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{
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float4 scene_color = getColor(_MainTex, i.uv);
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//scene_color = BiLinear(_MainTex, i.uv);
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//scene_color = BiCubic(_MainTex, i.uv);
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float3 col = scene_color * (1-amount) + blend_color * amount;
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return float4(col, 1.0);
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}
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ENDCG
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// (0) VRRenderCloud
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Pass
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{
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CGPROGRAM
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#pragma vertex vert_img
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#pragma fragment frag
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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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