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/**
* @file nightVisionF.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
* $/LicenseInfo$
*/
uniform sampler2DRect RenderTexture;
uniform sampler2D NoiseTexture;
uniform float brightMult;
uniform float noiseStrength;
float luminance(vec3 color)
{
/// CALCULATING LUMINANCE (Using NTSC lum weights)
/// http://en.wikipedia.org/wiki/Luma_%28video%29
return dot(color, vec3(0.299, 0.587, 0.114));
}
void main(void)
{
/// Get scene color
vec3 color = vec3(texture2DRect(RenderTexture, gl_TexCoord[0].st));
/// Extract luminance and scale up by night vision brightness
float lum = luminance(color) * brightMult;
/// Convert into night vision color space
/// Newer NVG colors (crisper and more saturated)
vec3 outColor = (lum * vec3(0.91, 1.21, 0.9)) + vec3(-0.07, 0.1, -0.12);
/// Add noise
float noiseValue = texture2D(NoiseTexture, gl_TexCoord[1].st).r;
noiseValue = (noiseValue - 0.5) * noiseStrength;
/// Older NVG colors (more muted)
// vec3 outColor = (lum * vec3(0.82, 0.75, 0.83)) + vec3(0.05, 0.32, -0.11);
outColor += noiseValue;
gl_FragColor = vec4(outColor, 1.0);
}
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