coordinates - change the axis Y. From "bottom left" to "top left"? (opengl) -


change axis y. "bottom left" "top left"? tried glscalef (1.f,-1.f, 1.f); turns upside down. how make glrectf (0,0,200,200); draw in upper left corner instead of bottom left?

given

  • width , height of viewport,
  • and "corresponding" orthographic projection (e.g. gluortho2d(0, width, 0, height),
  • and no other model view transformation,

glrectf(0, height, 200, height-200) creates desired output.


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