mirror of https://github.com/minetest/minetest.git
30 lines
747 B
GLSL
30 lines
747 B
GLSL
#define rendered texture0
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uniform sampler2D rendered;
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uniform vec2 texelSize0;
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uniform mediump float bloomRadius = 3.0;
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#ifdef GL_ES
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varying mediump vec2 varTexCoord;
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#else
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centroid varying vec2 varTexCoord;
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#endif
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void main(void)
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{
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// kernel distance and linear size
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mediump float n = 2. * bloomRadius + 1.;
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vec2 uv = varTexCoord.st - vec2(bloomRadius * texelSize0.x, 0.);
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vec4 color = vec4(0.);
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mediump float sum = 0.;
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for (mediump float i = 0.; i < n; i++) {
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mediump float weight = pow(1. - (abs(i / bloomRadius - 1.)), 1.3);
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color += texture2D(rendered, uv).rgba * weight;
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sum += weight;
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uv += vec2(texelSize0.x, 0.);
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}
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color /= sum;
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gl_FragColor = vec4(color.rgb, 1.0); // force full alpha to avoid holes in the image.
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}
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