mirror of https://github.com/bsnes-emu/bsnes.git
32 lines
637 B
Forth
32 lines
637 B
Forth
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#version 150
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uniform sampler2D source[];
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uniform vec4 sourceSize[];
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in Vertex {
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vec2 vTexCoord;
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};
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out vec4 FragColor;
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// Higher value, more centered glow.
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// Lower values might need more taps.
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#define GLOW_FALLOFF 0.35
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#define TAPS 4
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#define kernel(x) exp(-GLOW_FALLOFF * (x) * (x))
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void main() {
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vec3 col = vec3(0.0);
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float dy = sourceSize[0].w;
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float k_total = 0.0;
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for (int i = -TAPS; i <= TAPS; i++)
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{
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float k = kernel(i);
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k_total += k;
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col += k * texture(source[0], vTexCoord + vec2(0.0, float(i) * dy)).rgb;
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}
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FragColor = vec4(col / k_total, 1.0);
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}
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