27 lines
1.3 KiB
GLSL
27 lines
1.3 KiB
GLSL
// linear sampling gaussian blur (kernel size : 9)
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// from http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling
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uniform sampler2DRect colorSampler;
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layout(location = 0)out vec4 outColor;
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uniform int width;
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uniform int height;
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void main(void)
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{
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vec3 color = texelFetch(colorSampler, ivec2(gl_FragCoord.xy)).xyz * 0.2270270270;
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#ifdef HORIZONTAL_BLUR
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color += texture(colorSampler, vec2((gl_FragCoord.x + 1.3846153846), gl_FragCoord.y)).xyz * 0.3162162162;
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color += texture(colorSampler, vec2((gl_FragCoord.x - 1.3846153846), gl_FragCoord.y)).xyz * 0.3162162162;
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color += texture(colorSampler, vec2((gl_FragCoord.x + 3.2307692308), gl_FragCoord.y)).xyz * 0.0702702703;
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color += texture(colorSampler, vec2((gl_FragCoord.x - 3.2307692308), gl_FragCoord.y)).xyz * 0.0702702703;
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#else
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color += texture(colorSampler, vec2(gl_FragCoord.x, (gl_FragCoord.y + 1.3846153846))).xyz * 0.3162162162;
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color += texture(colorSampler, vec2(gl_FragCoord.x, (gl_FragCoord.y - 1.3846153846))).xyz * 0.3162162162;
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color += texture(colorSampler, vec2(gl_FragCoord.x, (gl_FragCoord.y + 3.2307692308))).xyz * 0.0702702703;
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color += texture(colorSampler, vec2(gl_FragCoord.x, (gl_FragCoord.y - 3.2307692308))).xyz * 0.0702702703;
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#endif
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outColor = vec4(color, 1.0);
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}
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