19 lines
508 B
GLSL
19 lines
508 B
GLSL
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precision mediump float;
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varying mediump vec2 v_texcoord;
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uniform sampler2D tex;
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uniform float radius;
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uniform vec2 halfpixel;
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void main() {
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vec2 uv = v_texcoord * 2.0;
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vec4 sum = texture2D(tex, uv) * 4.0;
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sum += texture2D(tex, uv - halfpixel.xy * radius);
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sum += texture2D(tex, uv + halfpixel.xy * radius);
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sum += texture2D(tex, uv + vec2(halfpixel.x, -halfpixel.y) * radius);
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sum += texture2D(tex, uv - vec2(halfpixel.x, -halfpixel.y) * radius);
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gl_FragColor = sum / 8.0;
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}
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