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r8031 | terminx | 2019-08-16 02:11:22 -0700 (Fri, 16 Aug 2019) | 6 lines

Add r_swapcomplete cvar to control what happens after SDL_GL_SwapWindow()

0: do nothing
1: glFinish()
2: busy loop until currentVBlankInterval
3: glFlush()
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