
*** this version of tksdl uses libSDL2 via the sdl12-compat library, see https://github.com/libsdl-org/sdl12-compat ***

- set env.var TKSDL_FULLFRAME to force FPS precision to 1.0
   (workaround for buggy gettimeofday(), should usually not be needed)
 
- set env.var TKSDL_GLERROR=1 to enable GL error trace (call glError() after each GL call)


compile time options:

DX_GLES - Compile with OpenGL ES support

DX_GLES_GLEMU - Compile with Desktop OpenGL emulation support (must also be enabled in tkopengl)
