62 lines
1.4 KiB
GLSL
62 lines
1.4 KiB
GLSL
#version 300 es
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precision highp float;
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precision highp sampler2D;
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in vec2 texCoord;
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out vec4 fragColor;
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uniform sampler2D xTex;
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uniform sampler2D bTex;
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float x(ivec2 coord)
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{
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if( coord.x <= 0
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|| coord.x >= textureSize(xTex, 0).x
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|| coord.y <= 0
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|| coord.y >= textureSize(xTex, 0).y)
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{
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return(0.);
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}
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return(texelFetch(xTex, coord, 0).x);
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}
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float b(ivec2 coord)
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{
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if( coord.x <= 0
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|| coord.x >= textureSize(bTex, 0).x
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|| coord.y <= 0
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|| coord.y >= textureSize(bTex, 0).y)
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{
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return(0.);
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}
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return(texelFetch(bTex, coord, 0).x);
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}
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float residual(ivec2 coord)
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{
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ivec2 vr = coord + ivec2(1, 0);
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ivec2 vl = coord - ivec2(1, 0);
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ivec2 vt = coord + ivec2(0, 1);
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ivec2 vb = coord - ivec2(0, 1);
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return((x(vl) + x(vr) + x(vt) + x(vb) + b(coord) - 4.*x(coord))*4.);
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}
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void main()
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{
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ivec2 pixelCoord = ivec2(floor(gl_FragCoord.xy));
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float restricted = residual(2*pixelCoord + ivec2(-1, -1))
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+ residual(2*pixelCoord + ivec2(1, -1))
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+ residual(2*pixelCoord + ivec2(1, 1))
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+ residual(2*pixelCoord + ivec2(-1, 1))
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+ 2.*residual(2*pixelCoord + ivec2(-1, 0))
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+ 2.*residual(2*pixelCoord + ivec2(1, 0))
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+ 2.*residual(2*pixelCoord + ivec2(0, -1))
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+ 2.*residual(2*pixelCoord + ivec2(0, 1))
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+ 4.*residual(2*pixelCoord);
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restricted /= 16.;
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fragColor = vec4(restricted, 0, 0, 1);
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}
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