Tuesday, March 10, 2015

GLSL 3.30 in Intel Haswell CPU

This error could show up while trying to run your OpenGL program that uses GLSL on Haswell:
$ error GLSL 3.30 not supported.. 
It's very probably because you don't specifically ask the OpenGL implementation (in this case mesa) for Core Profile because only Haswell OpenGL core profile supports GLSL 3.30, as shown in this Haswell glxinfo dump:
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile 
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.4.5
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL version string: 3.0 Mesa 10.4.5
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
As you can see, the non-core profile only supports up-to GLSL 1.30. Now, how do you go about asking core profile in your OpenGL application? If you are using freeglut, you can use these functions:

#include <gl\freeglut.h>
int main(int argc, char * argv[])
Remember that the initialization code above must be called when you initialize your OpenGL environment. Also, it only applies if you use freeglut library.
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