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Robert Menzel authored
* Some GL 2.1 compatibility improvements: * On GL 2.1 the shaderfiles are read from a different folder by default * 3.0+ functions are not compiled for 2.1 any more * The RenderObject is not 2.1 compatible, so it's not compiled for old systems atm. A port could be possible. * ACGL compiles for GL 2.1 now * Added compile warning in case the desired OpenGL version is not defined by the build system (which could screw up conditional compile) * Minor fixes
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