SDL_GetCurrentDisplayMode not returning correct window size

Question

My Question is how to get the current window size?

It needs to be able to get the window size, both fullscreen or windowed.

I am using SDL2, Glad, OpenGL #ver 130. On Window 10 with scaling.

I initialized the window to be 1280x720.

SDL_CreateWindow(window, title.c_str(), SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
        1280, 720, SDL_WINDOW_ALLOW_HIGHDPI | SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL |
        SDL_WINDOW_RESIZABLE);

It is an OpenGL context enable window.

SDL_GL_CreateContext
gladLoadGL

All I want is the get the current window size. I expected it to be 1280x720.

        SDL_DisplayMode dm;
        if( SDL_GetCurrentDisplayMode( 0, &dm ) != 0 ) {
            //save log
        }
        printf("%dx%d\n", dm.h, dm.w);

The terminal output.

960x1707

And yet I am getting an odd number, 1707x960. I don't think this is correct.

Answer 1

SDL_GetCurrentDisplayMode() returns the current resolution of the given display/monitor, not the size of a window.

You want SDL_GetWindowSize() for the window size and SDL_GL_GetDrawableSize() for un-HiDPI-scaled dimensions to pass into glViewport().