SDL_GetDesktopDisplayMode resolution reported in Windows 10 when using app scaling

SDL Development
4

I think you have to set WINVER to the Windows 8.1 constant to call SetProcessDpiAwareness directly, but then the app will be windows 8.1+ only.

Here’s a snippet to load them at runtime:

typedef enum PROCESS_DPI_AWARENESS {
    PROCESS_DPI_UNAWARE = 0,
    PROCESS_SYSTEM_DPI_AWARE = 1,
    PROCESS_PER_MONITOR_DPI_AWARE = 2
} PROCESS_DPI_AWARENESS;

void* userDLL;
BOOL(WINAPI *SetProcessDPIAware)(void); // Vista and later
void* shcoreDLL;
HRESULT(WINAPI *SetProcessDpiAwareness)(PROCESS_DPI_AWARENESS dpiAwareness); // Windows 8.1 and later

userDLL = SDL_LoadObject("USER32.DLL");
if (userDLL) {
    SetProcessDPIAware = (BOOL(WINAPI *)(void)) SDL_LoadFunction(userDLL, "SetProcessDPIAware");
}

shcoreDLL = SDL_LoadObject("SHCORE.DLL");
if (shcoreDLL) {
    SetProcessDpiAwareness = (HRESULT(WINAPI *)(PROCESS_DPI_AWARENESS)) SDL_LoadFunction(shcoreDLL, "SetProcessDpiAwareness");
}

if (SetProcessDpiAwareness) {
    /* Try Windows 8.1+ version */
    HRESULT result = SetProcessDpiAwareness(PROCESS_PER_MONITOR_DPI_AWARE);
    SDL_Log("called SetProcessDpiAwareness: %d", (result == S_OK) ? 1 : 0);
}
else if (SetProcessDPIAware) {
    /* Try Vista - Windows 8 version.
    This has a constant scale factor for all monitors.
    */
    BOOL success = SetProcessDPIAware();
    SDL_Log("called SetProcessDPIAware: %d", (int)success);
}
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