Lighthouse3D Updates GLSL Tutorial to Include OpenGL 2.0

The GLSL tutorial now covers OpenGL 2.0 functions in addition to the ARB extensions. Both versions are now available in the tutorial, with syntax and source code color coded. While the ARB extension version provides backwards compatibility, the OpenGL 2.0 version is available more and more with the new driver releases and new hardware. The source code has also been updated to include both versions.


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