34 lines
829 B
GLSL
34 lines
829 B
GLSL
uniform sampler2D inputTex;
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uniform float textureWidth;
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uniform float textureHeight;
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varying vec2 pos;
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varying vec2 blurDirection;
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// Converts pixel coordinates to texture coordinates
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vec2 pix2tex(vec2 pix)
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{
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return vec2(pix.x / textureWidth, 1.0 - pix.y / textureHeight);
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}
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vec3 blurTex(float offset, float strength)
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{
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return texture2D(inputTex, pix2tex(pos + blurDirection * offset)).rgb * strength;
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}
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void main()
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{
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// Do the gaussian blur
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// This blur actually has a radius of 4, but we take advantage of gpu's
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// linear texture filtering, so e.g. 1.5 actually gives us both texels
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// 1 and 2
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vec3 tex = blurTex(0.0, 0.20);
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tex += blurTex(-1.5, 0.30);
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tex += blurTex( 1.5, 0.30);
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tex += blurTex(-3.5, 0.10);
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tex += blurTex( 3.5, 0.10);
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gl_FragColor = vec4(tex, 1.0);
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}
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