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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
#extension GL_ARB_texture_multisample : enable
uniform sampler2DMS diffuseRect;
uniform sampler2DMS edgeMap;
uniform sampler2DMS depthMap;
uniform sampler2DMS normalMap;
uniform sampler2D bloomMap;
uniform float depth_cutoff;
uniform float norm_cutoff;
uniform float focal_distance;
uniform float blur_constant;
uniform float tan_pixel_angle;
uniform float magnification;
uniform mat4 inv_proj;
uniform vec2 screen_res;
varying vec2 vary_fragcoord;
vec4 texture2DMS(sampler2DMS tex, ivec2 tc)
{
vec4 ret = vec4(0,0,0,0);
for (int i = 0; i < samples; ++i)
{
ret += texelFetch(tex, tc, i);
}
return ret/samples;
}
float getDepth(ivec2 pos_screen)
{
float z = texture2DMS(depthMap, pos_screen.xy).r;
z = z*2.0-1.0;
vec4 ndc = vec4(0.0, 0.0, z, 1.0);
vec4 p = inv_proj*ndc;
return p.z/p.w;
}
float calc_cof(float depth)
{
float sc = abs(depth-focal_distance)/-depth*blur_constant;
sc /= magnification;
// tan_pixel_angle = pixel_length/-depth;
float pixel_length = tan_pixel_angle*-focal_distance;
sc = sc/pixel_length;
sc *= 1.414;
return sc;
}
void dofSample(inout vec4 diff, inout float w, float min_sc, float cur_depth, ivec2 tc)
{
float d = getDepth(tc);
float sc = calc_cof(d);
if (sc > min_sc //sampled pixel is more "out of focus" than current sample radius
|| d < cur_depth) //sampled pixel is further away than current pixel
{
float wg = 0.25;
vec4 s = texture2DMS(diffuseRect, tc);
// de-weight dull areas to make highlights 'pop'
wg += s.r+s.g+s.b;
diff += wg*s;
w += wg;
}
}
void main()
{
ivec2 itc = ivec2(vary_fragcoord.xy);
vec3 norm = texture2DMS(normalMap, itc).xyz;
norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
float depth = getDepth(itc);
vec4 diff = texture2DMS(diffuseRect, itc);
{
float w = 1.0;
float sc = calc_cof(depth);
sc = min(abs(sc), 10.0);
float fd = depth*0.5f;
float PI = 3.14159265358979323846264;
int isc = int(sc);
// sample quite uniformly spaced points within a circle, for a circular 'bokeh'
//if (depth < focal_distance)
{
for (int x = -isc; x <= isc; x+=2)
{
for (int y = -isc; y <= isc; y+=2)
{
ivec2 cur_samp = ivec2(x,y);
float cur_sc = length(vec2(cur_samp));
if (cur_sc < sc)
{
dofSample(diff, w, cur_sc, depth, itc+cur_samp);
}
}
}
}
diff /= w;
}
vec4 bloom = texture2D(bloomMap, vary_fragcoord.xy/screen_res);
gl_FragColor = diff + bloom;
}
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