97 lines
2.0 KiB
GLSL
97 lines
2.0 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 depthMap;
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uniform sampler2DRect normalMap;
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uniform sampler2DRect lightMap;
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uniform sampler2DRect edgeMap;
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uniform float dist_factor;
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uniform float blur_size;
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uniform vec2 delta;
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uniform vec3 kern[4];
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uniform float kern_scale;
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varying vec2 vary_fragcoord;
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uniform mat4 inv_proj;
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uniform vec2 screen_res;
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vec4 getPosition(vec2 pos_screen)
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{
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float depth = texture2DRect(depthMap, pos_screen.xy).a;
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vec2 sc = pos_screen.xy*2.0;
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sc /= screen_res;
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sc -= vec2(1.0,1.0);
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vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
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vec4 pos = inv_proj * ndc;
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pos /= pos.w;
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pos.w = 1.0;
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return pos;
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}
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void main()
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{
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vec3 norm = texture2DRect(normalMap, vary_fragcoord.xy).xyz*2.0-1.0;
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vec3 pos = getPosition(vary_fragcoord.xy).xyz;
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vec4 ccol = texture2DRect(lightMap, vary_fragcoord.xy).rgba;
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vec2 dlt = kern_scale * delta / (1.0+norm.xy*norm.xy);
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dlt /= max(-pos.z*dist_factor, 1.0);
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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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vec4 col = defined_weight.xyxx * ccol;
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float e = 1.0;
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for (int i = 0; i < 4; i++)
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{
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vec2 tc = vary_fragcoord.xy + kern[i].z*dlt;
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e = max(e, 0.0);
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vec2 wght = kern[i].xy*e;
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col += texture2DRect(lightMap, tc)*wght.xyxx;
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defined_weight += wght;
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e *= e;
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e -= texture2DRect(edgeMap, tc.xy).a+
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texture2DRect(edgeMap, tc.xy+dlt*0.333).a+
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texture2DRect(edgeMap, tc.xy-dlt*0.333).a;
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}
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e = 1.0;
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for (int i = 0; i < 4; i++)
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{
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vec2 tc = vary_fragcoord.xy - kern[i].z*dlt;
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e = max(e, 0.0);
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vec2 wght = kern[i].xy*e;
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col += texture2DRect(lightMap, tc)*wght.xyxx;
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defined_weight += wght;
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e *= e;
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e -= texture2DRect(edgeMap, tc.xy).a+
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texture2DRect(edgeMap, tc.xy+dlt*0.333).a+
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texture2DRect(edgeMap, tc.xy-dlt*0.333).a;
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}
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col /= defined_weight.xyxx;
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gl_FragColor = col;
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//gl_FragColor = ccol;
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}
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