mirror of https://github.com/axmolengine/axmol.git
49 lines
1.0 KiB
GLSL
49 lines
1.0 KiB
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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varying vec4 v_fragmentColor;
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varying vec2 v_texCoord;
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uniform vec2 resolution;
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uniform float blurRadius;
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uniform float sampleNum;
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uniform sampler2D u_tex0;
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vec4 blur(vec2);
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void main(void)
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{
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vec4 col = blur(v_texCoord); //* v_fragmentColor.rgb;
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gl_FragColor = vec4(col) * v_fragmentColor;
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}
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vec4 blur(vec2 p)
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{
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if (blurRadius > 0.0 && sampleNum > 1.0)
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{
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vec4 col = vec4(0);
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vec2 unit = 1.0 / resolution.xy;
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float r = blurRadius;
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float sampleStep = r / sampleNum;
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float count = 0.0;
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for(float x = -r; x < r; x += sampleStep)
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{
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for(float y = -r; y < r; y += sampleStep)
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{
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float weight = (r - abs(x)) * (r - abs(y));
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col += texture2D(u_tex0, p + vec2(x * unit.x, y * unit.y)) * weight;
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count += weight;
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}
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}
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return col / count;
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}
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return texture2D(u_tex0, p);
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}
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