48 lines
1,013 B
GLSL
48 lines
1,013 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec4 infiniteRect;
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uniform vec4 inputBBox[1];
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varying vec4 outputBBox;
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uniform vec2 center;
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uniform float radius;
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uniform float blur;
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void addPoint(inout vec4 rect, vec2 p) {
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rect.xy = min(rect.xy, p);
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rect.zw = max(rect.zw, p);
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}
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void addBlurredPointBox(inout vec4 rect, vec2 p)
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{
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vec2 v = p - center;
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float vLength = length(v);
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float dist = max(length(v) - radius, 0.0);
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float b = blur * dist;
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v *= (b / max(vLength, 0.01));
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addPoint(rect, p - v);
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addPoint(rect, p + v);
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}
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void main( void )
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{
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outputBBox = inputBBox[0];
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if(outputBBox != infiniteRect)
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{
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// Add the bounding box of each blurred corner
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addBlurredPointBox(outputBBox, inputBBox[0].xy);
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addBlurredPointBox(outputBBox, inputBBox[0].xw);
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addBlurredPointBox(outputBBox, inputBBox[0].zy);
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addBlurredPointBox(outputBBox, inputBBox[0].zw);
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}
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gl_Position = vec4(0.0); // Does not link without
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}
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