40 lines
951 B
GLSL
40 lines
951 B
GLSL
uniform sampler2D inputTex;
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varying vec2 samplePos1;
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varying vec2 samplePos2;
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varying vec2 samplePos3;
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varying vec2 samplePos4;
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varying vec2 samplePos5;
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// If defined, use five samples (blur radius = 5), otherwise 3 samples (radius = 3)
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#define FIVE_SAMPLES
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vec3 blurTex(vec2 pos, float strength)
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{
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return texture2D(inputTex, pos).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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#ifdef FIVE_SAMPLES
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vec3 tex = blurTex(samplePos1, 0.30);
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tex += blurTex(samplePos2, 0.25);
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tex += blurTex(samplePos3, 0.25);
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tex += blurTex(samplePos4, 0.1);
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tex += blurTex(samplePos5, 0.1);
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#else
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vec3 tex = blurTex(samplePos1, 0.40);
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tex += blurTex(samplePos2, 0.30);
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tex += blurTex(samplePos3, 0.30);
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#endif
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gl_FragColor = vec4(tex, 1.0);
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}
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