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/**
* @file glowExtractF.glsl
*
* Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
* $License$
*/
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect diffuseMap;
uniform float minLuminance;
uniform float maxExtractAlpha;
uniform vec3 lumWeights;
uniform vec3 warmthWeights;
uniform float warmthAmount;
void main()
{
vec4 col = texture2DRect(diffuseMap, gl_TexCoord[0].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)) );
gl_FragColor.rgb = col.rgb;
gl_FragColor.a = max(col.a, mix(lum, warmth, warmthAmount) * maxExtractAlpha);
}
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