The prototype of Zen Zoom. Made on ubuntu, I guess.
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uniform sampler2D tex;
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uniform vec4 background_color;
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uniform mat4 color_transformation;
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void main( void ) {
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vec4 orig = texture2D(tex, gl_TexCoord[0].st);
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gl_FragColor = background_color + color_transformation * orig;
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{ // shine
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vec2 offset = vec2(0.01, 0.0);
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vec4 a = texture2D(tex, gl_TexCoord[0].st - offset);
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vec4 b = texture2D(tex, gl_TexCoord[0].st + offset);
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if(length(a-b) < 0.1 && length(orig.rgb) > 0.3)
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gl_FragColor *= 1.0 + 0.01/length(a-b);
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}
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gl_FragColor.a = 1.0;
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}
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