/usr/share/psychtoolbox-3/PsychOpenGL/PsychGLSLShaders/WeightedSumOfFourChannelsTextureShader.vert.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 15 16 17 18 19 20 | /* Shader for weighted summing of input texture layers into
* a scalar output value which is replicated into all four output
* components.
*
* (c) 2014 by Mario Kleiner. Licensed under MIT license.
*/
/* Attributes passed from Screen(): See the ProceduralShadingAPI.m file for infos: */
attribute vec4 modulateColor;
/* Information passed to the fragment shader: */
varying vec4 mixWeights;
void main()
{
/* Apply standard geometric transformations to patch: */
gl_Position = ftransform();
gl_TexCoord[0] = gl_MultiTexCoord0;
mixWeights = modulateColor;
}
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