I am working on an OpenGL application. I use a screen with a high resolution per inch, and the Windows GUI is scaled to 125% so that the programs look on a regular screen.
If I create a 800 * 600 window using SDL2, it will be the same size as on a regular screen, but it is 1000 * 750 pixels. Since I use delayed rendering, I have to create buffers with the same size as the drawing area, so I would like to know the actual size of the window in pixels.
If I call SDL_GL_GetDrawableSize, I get 800 * 600 incorrectly instead of 1000 * 750. I added a flag SDL_WINDOW_ALLOW_HIGHDPIwhen creating the window.
How am I wrong?
Edit
If I change the DPI Awareness in Visual Studio to a high DPI monitor , then the window is really 800 * 600, but it looks small. It should be 1000 * 750, because the scaling factor in Windows settings is 125%
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