49 lines
1.2 KiB
GLSL
49 lines
1.2 KiB
GLSL
/**
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* @file blurLightF.glsl
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*
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* Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
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* $License$
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*/
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#extension GL_ARB_texture_rectangle : enable
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uniform sampler2DRect positionMap;
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uniform sampler2DRect normalMap;
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uniform sampler2DRect lightMap;
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uniform float blur_size;
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uniform vec2 delta;
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uniform vec3 kern[32];
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uniform int kern_length;
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uniform float kern_scale;
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varying vec2 vary_fragcoord;
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void main()
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{
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vec3 norm = texture2DRect(normalMap, vary_fragcoord.xy).xyz;
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vec3 pos = texture2DRect(positionMap, vary_fragcoord.xy).xyz;
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vec2 ccol = texture2DRect(lightMap, vary_fragcoord.xy).rg;
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vec2 dlt = kern_scale * delta / (1.0+norm.xy*norm.xy);
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vec2 defined_weight = kern[0].xy; // special case the first (centre) sample's weight in the blur; we have to sample it anyway so we get it for 'free'
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vec2 col = defined_weight * ccol;
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for (int i = 1; i < kern_length; i++)
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{
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vec2 tc = vary_fragcoord.xy + kern[i].z*dlt;
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vec3 samppos = texture2DRect(positionMap, tc).xyz;
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float d = dot(norm.xyz, samppos.xyz-pos.xyz);// dist from plane
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if (d*d <= 0.003)
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{
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col += texture2DRect(lightMap, tc).rg*kern[i].xy;
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defined_weight += kern[i].xy;
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}
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}
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col /= defined_weight;
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gl_FragColor = vec4(col.r, col.g, 0.0, 1.0);
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}
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