138 lines
2.8 KiB
GLSL
138 lines
2.8 KiB
GLSL
/**
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* @file postDeferredF.glsl
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*
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* $/LicenseInfo$
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*/
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#version 120
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#extension GL_ARB_texture_rectangle : enable
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uniform sampler2DRect diffuseRect;
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uniform sampler2DRect edgeMap;
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uniform sampler2DRect depthMap;
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uniform sampler2DRect normalMap;
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uniform sampler2D bloomMap;
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uniform float depth_cutoff;
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uniform float norm_cutoff;
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uniform float focal_distance;
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uniform float blur_constant;
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uniform float tan_pixel_angle;
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uniform float magnification;
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uniform mat4 inv_proj;
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uniform vec2 screen_res;
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varying vec2 vary_fragcoord;
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float getDepth(vec2 pos_screen)
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{
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float z = texture2DRect(depthMap, pos_screen.xy).a;
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z = z*2.0-1.0;
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vec4 ndc = vec4(0.0, 0.0, z, 1.0);
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vec4 p = inv_proj*ndc;
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return p.z/p.w;
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}
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float calc_cof(float depth)
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{
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float sc = abs(depth-focal_distance)/-depth*blur_constant;
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sc /= magnification;
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// tan_pixel_angle = pixel_length/-depth;
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float pixel_length = tan_pixel_angle*-focal_distance;
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sc = sc/pixel_length;
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sc *= 1.414;
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return sc;
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}
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void dofSampleNear(inout vec4 diff, inout float w, float cur_sc, vec2 tc)
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{
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float d = getDepth(tc);
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float sc = calc_cof(d);
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float wg = 0.25;
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vec4 s = texture2DRect(diffuseRect, tc);
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// de-weight dull areas to make highlights 'pop'
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wg += s.r+s.g+s.b;
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diff += wg*s;
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w += wg;
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}
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void dofSample(inout vec4 diff, inout float w, float min_sc, float cur_depth, vec2 tc)
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{
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float d = getDepth(tc);
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float sc = calc_cof(d);
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if (sc > min_sc //sampled pixel is more "out of focus" than current sample radius
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|| d < cur_depth) //sampled pixel is further away than current pixel
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{
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float wg = 0.25;
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vec4 s = texture2DRect(diffuseRect, tc);
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// de-weight dull areas to make highlights 'pop'
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wg += s.r+s.g+s.b;
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diff += wg*s;
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w += wg;
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}
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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;
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norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
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vec2 tc = vary_fragcoord.xy;
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float depth = getDepth(tc);
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vec4 diff = texture2DRect(diffuseRect, vary_fragcoord.xy);
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{
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float w = 1.0;
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float sc = calc_cof(depth);
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sc = min(abs(sc), 10.0);
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float fd = depth*0.5f;
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float PI = 3.14159265358979323846264;
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// sample quite uniformly spaced points within a circle, for a circular 'bokeh'
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//if (depth < focal_distance)
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{
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while (sc > 0.5)
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{
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int its = int(max(1.0,(sc*3.7)));
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for (int i=0; i<its; ++i)
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{
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float ang = sc+i*2*PI/its; // sc is added for rotary perturbance
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float samp_x = sc*sin(ang);
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float samp_y = sc*cos(ang);
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// you could test sample coords against an interesting non-circular aperture shape here, if desired.
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dofSample(diff, w, sc, depth, vary_fragcoord.xy + vec2(samp_x,samp_y));
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}
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sc -= 1.0;
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}
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}
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diff /= w;
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}
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vec4 bloom = texture2D(bloomMap, vary_fragcoord.xy/screen_res);
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gl_FragColor = diff + bloom;
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}
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