/usr/share/psychtoolbox-3/PsychOpenGL/PsychGLSLShaders/ICMCheckedPassThroughShader.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 | /* Shader for color checking of RGB and luminance textures.
*
* Clamps all color or intensity values to lie in the range given
* by [ ICMClampToColorRange[0]; ICMClampToColorRange[1] ]. If values were
* outside that range, they will be inverted and mapped to values 0.0 or 1.0.
*
* (w)2008 by Mario Kleiner. Licensed under MIT license.
*/
/* Allowable range: To be initialized by PsychColorCorrection() typically: */
uniform vec2 ICMClampToColorRange;
vec4 icmTransformColor(vec4 incolor)
{
if (incolor.r < ICMClampToColorRange[0]) incolor.r = 1.0;
if (incolor.r > ICMClampToColorRange[1]) incolor.r = 0.0;
if (incolor.g < ICMClampToColorRange[0]) incolor.g = 1.0;
if (incolor.g > ICMClampToColorRange[1]) incolor.g = 0.0;
if (incolor.b < ICMClampToColorRange[0]) incolor.b = 1.0;
if (incolor.b > ICMClampToColorRange[1]) incolor.b = 0.0;
return(incolor);
}
float icmTransformColor1(float incolor)
{
if (incolor < ICMClampToColorRange[0]) incolor = 1.0;
if (incolor > ICMClampToColorRange[1]) incolor = 0.0;
return(incolor);
}
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