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/**
* @file blurLightF.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
#ifndef gl_FragColor
out vec4 gl_FragColor;
#endif
uniform sampler2DRect depthMap;
uniform sampler2DRect normalMap;
uniform sampler2DRect lightMap;
uniform float dist_factor;
uniform float blur_size;
uniform vec2 delta;
uniform vec3 kern[4];
uniform float kern_scale;
VARYING vec2 vary_fragcoord;
uniform mat4 inv_proj;
uniform vec2 screen_res;
vec4 getPosition(vec2 pos_screen)
{
float depth = texture2DRect(depthMap, pos_screen.xy).r;
vec2 sc = pos_screen.xy*2.0;
sc /= screen_res;
sc -= vec2(1.0,1.0);
vec4 ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
vec4 pos = inv_proj * ndc;
pos /= pos.w;
pos.w = 1.0;
return pos;
}
void main()
{
vec2 tc = vary_fragcoord.xy;
vec3 norm = texture2DRect(normalMap, tc).xyz;
norm = vec3((norm.xy-0.5)*2.0,norm.z); // unpack norm
vec3 pos = getPosition(tc).xyz;
vec4 ccol = texture2DRect(lightMap, tc).rgba;
vec2 dlt = kern_scale * delta / (1.0+norm.xy*norm.xy);
dlt /= max(-pos.z*dist_factor, 1.0);
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'
vec4 col = defined_weight.xyxx * ccol;
// relax tolerance according to distance to avoid speckling artifacts, as angles and distances are a lot more abrupt within a small screen area at larger distances
float pointplanedist_tolerance_pow2 = pos.z*pos.z*0.00005;
// perturb sampling origin slightly in screen-space to hide edge-ghosting artifacts where smoothing radius is quite large
tc += ( (mod(tc.x+tc.y,2) - 0.5) * kern[1].z * dlt * 0.5 );
for (int i = 1; i < 4; i++)
{
vec2 samptc = tc + kern[i].z*dlt;
vec3 samppos = getPosition(samptc).xyz;
float d = dot(norm.xyz, samppos.xyz-pos.xyz);// dist from plane
if (d*d <= pointplanedist_tolerance_pow2)
{
col += texture2DRect(lightMap, samptc)*kern[i].xyxx;
defined_weight += kern[i].xy;
}
}
for (int i = 1; i < 4; i++)
{
vec2 samptc = tc - kern[i].z*dlt;
vec3 samppos = getPosition(samptc).xyz;
float d = dot(norm.xyz, samppos.xyz-pos.xyz);// dist from plane
if (d*d <= pointplanedist_tolerance_pow2)
{
col += texture2DRect(lightMap, samptc)*kern[i].xyxx;
defined_weight += kern[i].xy;
}
}
col /= defined_weight.xyxx;
col.y *= col.y;
gl_FragColor = col;
}
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