/usr/share/psychtoolbox-3/PsychOpenGL/PsychGLSLShaders/LuminanceBlitShader.frag.txt is in psychtoolbox-3-common 3.0.12.20160126.dfsg1-1ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 | /* Shader for blitting of the luminance channel (red channel):
* (w)2006 by Mario Kleiner. Licensed under MIT license.
*/
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect Image;
void main()
{
vec4 incolor = texture2DRect(Image, gl_TexCoord[0].st);
gl_FragColor.a = incolor.a;
gl_FragColor.rgb = incolor.r;
}
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