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/**
* @file glowExtractF.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
* $/LicenseInfo$
*/
/*[EXTRA_CODE_HERE]*/
out vec4 frag_color;
uniform sampler2D diffuseMap;
#if HAS_NOISE
uniform sampler2D glowNoiseMap;
uniform vec2 screen_res;
#endif
uniform float minLuminance;
uniform float maxExtractAlpha;
uniform vec3 lumWeights;
uniform vec3 warmthWeights;
uniform float warmthAmount;
in vec2 vary_texcoord0;
void main()
{
vec4 col = texture(diffuseMap, vary_texcoord0.xy);
/// CALCULATING LUMINANCE (Using NTSC lum weights)
/// http://en.wikipedia.org/wiki/Luma_%28video%29
float lum = smoothstep(minLuminance, minLuminance+1.0, dot(col.rgb, lumWeights ) );
float warmth = smoothstep(minLuminance, minLuminance+1.0, max(col.r * warmthWeights.r, max(col.g * warmthWeights.g, col.b * warmthWeights.b)) );
#if HAS_NOISE
float TRUE_NOISE_RES = 128; // See mTrueNoiseMap
// *NOTE: Usually this is vary_fragcoord not vary_texcoord0, but glow extraction is in screen space
vec3 glow_noise = texture(glowNoiseMap, vary_texcoord0.xy * (screen_res / TRUE_NOISE_RES)).xyz;
// Dithering. Reduces banding effects in the reduced precision glow buffer.
float NOISE_DEPTH = 64.0;
col.rgb += glow_noise / NOISE_DEPTH;
col.rgb = max(col.rgb, vec3(0));
#endif
frag_color.rgb = col.rgb;
frag_color.a = max(col.a, mix(lum, warmth, warmthAmount) * maxExtractAlpha);
}
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