20 lines
567 B
GLSL
20 lines
567 B
GLSL
// Compute the pixelwise diff between two textures.
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// Computes the diff for each color chanel separately (r, g, b).
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// Assumes both images are not transparent.
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// try isampler2D, ivec4 etc.? Probably not
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uniform vec2 size;
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uniform vec2 offs;
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uniform sampler2D base;
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uniform sampler2D curr;
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void main(void)
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{
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vec2 pos = (gl_FragCoord.xy-offs)/size;
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pos.y = 1.0 - pos.y;
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vec4 color = texture2D(curr, pos);
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vec4 basecolor = texture2D(base, pos);
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color.xyz = color.xyz - basecolor.xyz;
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color.xyz = (vec3(1.0, 1.0, 1.0) + color.xyz)/2.0;
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gl_FragColor = color;
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}
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