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This is done by initializing the
![screen shot 2019-01-22 at 10 08 39 am](https://user-images.githubusercontent.com/40343339/51547482-68639480-1e34-11e9-99cf-8dfaf9dec97f.png)
SDL_Window
with theSDL_WINDOW_ALLOW_HIGHDPI
flag. Alone, that flag is not enough. So, I useSDL_GL_GetDrawableSize()
to fetch the real size of the window. I then create two 'scaling factor' variables, one for each dimension. The 'scaling factor' variables are calculated by dividing the output ofSDL_GL_GetDrawableSize
by the original window size... i.e.pixels_width
,pixels_height
. Then, in the functionSDL_ReDraw
(by Bisqwit), the destination rectangle (trect
) is scaled by the scaling factors, creating a smooth, crisp display on high-DPI monitors.