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5603cf2b0c
fix build on macOS 11 and 10.15, including on Apple silicon
There was a build error on macOS due to use of undeclared identifiers
glGetStringi and GL_NUM_EXTENSIONS. Those identifiers are declared in
OpenGL 3.0.
Switch from importing OpenGL/{gl.h,glext.h} to OpenGL/{gl3.h,gl3ext.h},
which fixes the problem. It also allows removing many OpenGL 3+ #defines,
though we do need to #define GL_LUMINANCE as was done in OpenGL/gl.h.
(It's also possible to keep the OpenGL/gl.h import, but it seems worse
to be importing both.)
Also remove #includes of Carbon/Carbon.h, OpenGL/OpenGL.h, AGL/agl.h,
since they don't seem to be needed.
Tested on macOS 11.4 (Big Sur) with Xcode 12.5.1 on Apple silicon,
and on macOS 10.15.7 (Catalina) with Xcode 12.4 on an Intel-based Mac.
(Hopefully this doesn't break older macOS platforms,
but unfortunately I can't test that easily.)
Fixes #354.
OpenLara
Classic Tomb Raider open-source engine
inspired by OpenTomb project http://opentomb.github.io/
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