47 lines
1.3 KiB
GLSL
47 lines
1.3 KiB
GLSL
#define M_PI 3.1415926535897932384626433832795
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uniform float sigma;
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uniform vec2 resolution;
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uniform bool horiz_blur;
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uniform bool vert_blur;
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uniform int iteration;
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float gaussian(float x, float sigma) {
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return (1.0/(sigma*sqrt(2.0*M_PI)))*exp(-0.5*pow(x/sigma, 2.0));
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}
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float gaussian2(float x, float y, float sigma) {
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return (1.0/(pow(sigma, 2.0)*2.0*M_PI))*exp(-0.5*((pow(x, 2.0) + pow(y, 2.0))/pow(sigma, 2.0)));
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}
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vec4 process(vec4 col) {
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float rad = ceil(3.0 * sigma);
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float sum = 0.0;
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vec4 color = vec4(0.0);
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bool radius_is_zero = (rad == 0.0 || sigma == 0.0);
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if (!radius_is_zero) {
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for (float x=-rad+0.5;x<=rad;x+=2.0) {
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sum += gaussian2(x, 0.0, sigma);
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}
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}
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if (iteration == 0 && horiz_blur && !radius_is_zero) {
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for (float x=-rad+0.5;x<=rad;x+=2.0) {
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float weight = (gaussian2(x, 0.0, sigma)/sum);
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color += texture2D(texture, vec2(gl_FragCoord.x+x, gl_FragCoord.y)/resolution)*(weight);
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}
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return color;
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} else if (iteration == 1 && vert_blur && !radius_is_zero) {
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for (float x=-rad+0.5;x<=rad;x+=2.0) {
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float weight = (gaussian2(0.0, x, sigma)/sum);
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color += texture2D(texture, vec2(gl_FragCoord.x, gl_FragCoord.y+x)/resolution)*(weight);
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}
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return color;
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} else {
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return col;
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}
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} |