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/**
* @file postDeferredF.glsl
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2007, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#extension GL_ARB_texture_rectangle : enable
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 gl_FragColor;
#endif
uniform sampler2DRect diffuseRect;
uniform mat4 inv_proj;
uniform vec2 screen_res;
uniform float max_cof;
uniform float res_scale;
VARYING vec2 vary_fragcoord;
void dofSample(inout vec4 diff, inout float w, float min_sc, vec2 tc)
{
vec4 s = texture2DRect(diffuseRect, tc);
float sc = s.a*max_cof;
if (sc > min_sc) //sampled pixel is more "out of focus" than current sample radius
{
float wg = 0.25;
// de-weight dull areas to make highlights 'pop'
wg += s.r+s.g+s.b;
diff += wg*s;
w += wg;
}
}
void main()
{
vec2 tc = vary_fragcoord.xy;
vec4 diff = texture2DRect(diffuseRect, vary_fragcoord.xy);
{
float w = 1.0;
float sc = diff.a*max_cof;
float PI = 3.14159265358979323846264;
// sample quite uniformly spaced points within a circle, for a circular 'bokeh'
{
while (sc > 0.5)
{
int its = int(max(1.0,(sc*3.7)));
for (int i=0; i<its; ++i)
{
float ang = sc+i*2*PI/its; // sc is added for rotary perturbance
float samp_x = sc*sin(ang);
float samp_y = sc*cos(ang);
// you could test sample coords against an interesting non-circular aperture shape here, if desired.
dofSample(diff, w, sc, vary_fragcoord.xy + vec2(samp_x,samp_y));
}
sc -= 1.0;
}
}
diff /= w;
}
gl_FragColor = diff;
}
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