/usr/share/psychtoolbox-3/PsychOpenGL/PsychGLSLShaders/ICMClampedPassThroughShader.frag.txt is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | /* Shader for color clamping of RGB textures.
*
* Clamps all color or intensity values to lie in the range given
* by [ ICMClampToColorRange[0]; ICMClampToColorRange[1] ].
*
* (w)2008 by Mario Kleiner. Licensed under MIT license.
*/
/* Allowable range: To be initialized by PsychColorCorrection() typically: */
uniform vec2 ICMClampToColorRange;
vec4 icmTransformColor(vec4 incolor)
{
vec4 outcolor;
/* Return alpha component unmodified: */
outcolor.a = incolor.a;
/* Clamp outcolor to range given by ICMClampToColorRange: */
outcolor.rgb = clamp(incolor.rgb, vec3(ICMClampToColorRange[0]), vec3(ICMClampToColorRange[1]));
return(outcolor);
}
float icmTransformColor1(float incolor)
{
float outcolor;
/* Clamp outcolor to range given by ICMClampToColorRange: */
outcolor = clamp(incolor, ICMClampToColorRange[0], ICMClampToColorRange[1]);
return(outcolor);
}
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