I'm trying to make a program using SDL and C++. How can I get screen's width and height in pixels in SDL?I'm trying to get screen's width not the window's width. . . .
Answer
In SDL2, use SDL_GetCurrentDisplayMode or SDL_GetDesktopDisplayMode depending on your needs. Usage example:
SDL_DisplayMode DM;
SDL_GetCurrentDisplayMode(0, &DM);
auto Width = DM.w;
auto Height = DM.h;
On high-DPI displays this will return the virtual resolution, not the physical resolution.
From the SDL2 wiki:
There's a difference between [SDL_GetDesktopDisplayMode()] and SDL_GetCurrentDisplayMode() when SDL runs fullscreen and has changed the resolution. In that case [SDL_GetDesktopDisplayMode()] will return the previous native display mode, and not the current display mode.