45 lines
1.5 KiB
GLSL
45 lines
1.5 KiB
GLSL
varying vec4 vColor;
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varying vec2 vTexCoord;
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uniform sampler2D u_texture;
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uniform vec2 resolution;
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uniform float radius;
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uniform int pass;
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void main() {
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//this will be our RGBA sum
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vec4 sum = vec4(0.0);
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//our original texcoord for this fragment
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vec2 tc = vTexCoord;
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//the amount to blur, i.e. how far off center to sample from
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//1.0 -> blur by one pixel
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//2.0 -> blur by two pixels, etc.
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float blur = radius/resolution.y;
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//the direction of our blur
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//(1.0, 0.0) -> x-axis blur
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//(0.0, 1.0) -> y-axis blur
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float hstep = 1.0;
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float vstep = 0.0;
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if (pass == 1) {
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hstep = 0.0;
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vstep = 1.0;
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}
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sum += texture2D(u_texture, vec2(tc.x - 5.0*blur*hstep, tc.y - 5.0*blur*vstep)) * 0.014374;
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sum += texture2D(u_texture, vec2(tc.x - 4.0*blur*hstep, tc.y - 4.0*blur*vstep)) * 0.035855;
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sum += texture2D(u_texture, vec2(tc.x - 3.0*blur*hstep, tc.y - 3.0*blur*vstep)) * 0.072994;
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sum += texture2D(u_texture, vec2(tc.x - 2.0*blur*hstep, tc.y - 2.0*blur*vstep)) * 0.121281;
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sum += texture2D(u_texture, vec2(tc.x - 1.0*blur*hstep, tc.y - 1.0*blur*vstep)) * 0.164472;
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sum += texture2D(u_texture, vec2(tc.x + 1.0*blur*hstep, tc.y + 1.0*blur*vstep)) * 0.164472;
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sum += texture2D(u_texture, vec2(tc.x + 2.0*blur*hstep, tc.y + 2.0*blur*vstep)) * 0.121281;
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sum += texture2D(u_texture, vec2(tc.x + 3.0*blur*hstep, tc.y + 3.0*blur*vstep)) * 0.072994;
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sum += texture2D(u_texture, vec2(tc.x + 4.0*blur*hstep, tc.y + 4.0*blur*vstep)) * 0.035855;
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sum += texture2D(u_texture, vec2(tc.x + 5.0*blur*hstep, tc.y + 5.0*blur*vstep)) * 0.014374;
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gl_FragColor = sum;
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} |