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/**
* @file class3/deferred/gatherSkyShF.glsl
*
* $LicenseInfo:firstyear=2005&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2005, 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
* $/LicenseInfo$
*/
#ifdef DEFINE_GL_FRAGCOLOR
out vec4 frag_data[3];
#else
#define frag_data gl_FragData
#endif
VARYING vec2 vary_frag;
uniform vec2 screen_res;
uniform sampler2D sh_input_r;
uniform sampler2D sh_input_g;
uniform sampler2D sh_input_b;
void main()
{
vec2 offset = vec2(2.0) / screen_res;
vec4 r = vec4(0);
vec4 g = vec4(0);
vec4 b = vec4(0);
vec2 tc = vary_frag * 2.0;
r += texture2D(sh_input_r, tc + vec2(0, 0));
r += texture2D(sh_input_r, tc + vec2(offset.x, 0));
r += texture2D(sh_input_r, tc + vec2(0, offset.y));
r += texture2D(sh_input_r, tc + vec2(offset.x, offset.y));
r /= 4.0f;
g += texture2D(sh_input_g, tc + vec2(0, 0));
g += texture2D(sh_input_g, tc + vec2(offset.x, 0));
g += texture2D(sh_input_g, tc + vec2(0, offset.y));
g += texture2D(sh_input_g, tc + vec2(offset.x, offset.y));
g /= 4.0f;
b += texture2D(sh_input_b, tc + vec2(0, 0));
b += texture2D(sh_input_b, tc + vec2(offset.x, 0));
b += texture2D(sh_input_b, tc + vec2(0, offset.y));
b += texture2D(sh_input_b, tc + vec2(offset.x, offset.y));
b /= 4.0f;
frag_data[0] = r;
frag_data[1] = g;
frag_data[2] = b;
}
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