add opengl 2.1 support, update imgui, update premake script

This commit is contained in:
Irlan
2018-04-04 15:06:15 -03:00
parent 2b764021ff
commit ef937c029b
27 changed files with 21879 additions and 4465 deletions

3659
external/glad_4/glad.h vendored Normal file

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