SDL

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/*
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  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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/* Program to test querying of display info */
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#include <stdlib.h>
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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#include <SDL3/SDL_test.h>
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static void
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print_mode(const char *prefix, const SDL_DisplayMode *mode)
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{
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    if (!mode) {
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        return;
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    }
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    SDL_Log("%s: %dx%d@%gx, %gHz, fmt=%s\n",
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            prefix,
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            mode->w, mode->h, mode->pixel_density, mode->refresh_rate,
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            SDL_GetPixelFormatName(mode->format));
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}
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int main(int argc, char *argv[])
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{
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    SDL_DisplayID *displays;
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    SDL_DisplayMode **modes;
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    const SDL_DisplayMode *mode;
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    int num_displays, i;
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    SDLTest_CommonState *state;
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    /* Initialize test framework */
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    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
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    if (!state) {
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        return 1;
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    }
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    /* Enable standard application logging */
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    SDL_SetLogPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    /* Parse commandline */
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    if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
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        return 1;
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    }
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    /* Load the SDL library */
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    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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        return 1;
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    }
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    SDL_Log("Using video target '%s'.\n", SDL_GetCurrentVideoDriver());
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    displays = SDL_GetDisplays(&num_displays);
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    SDL_Log("See %d displays.\n", num_displays);
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    for (i = 0; i < num_displays; i++) {
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        SDL_DisplayID dpy = displays[i];
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        SDL_PropertiesID props = SDL_GetDisplayProperties(dpy);
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        SDL_Rect rect = { 0, 0, 0, 0 };
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        int m, num_modes = 0;
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        const SDL_bool has_HDR = SDL_GetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, SDL_FALSE);
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        SDL_GetDisplayBounds(dpy, &rect);
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        modes = SDL_GetFullscreenDisplayModes(dpy, &num_modes);
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        SDL_Log("%" SDL_PRIu32 ": \"%s\" (%dx%d at %d,%d), content scale %.2f, %d fullscreen modes, HDR capable: %s.\n", dpy, SDL_GetDisplayName(dpy), rect.w, rect.h, rect.x, rect.y, SDL_GetDisplayContentScale(dpy), num_modes, has_HDR ? "yes" : "no");
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        mode = SDL_GetCurrentDisplayMode(dpy);
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        if (mode) {
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            print_mode("CURRENT", mode);
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        } else {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    CURRENT: failed to query (%s)\n", SDL_GetError());
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        }
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        mode = SDL_GetDesktopDisplayMode(dpy);
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        if (mode) {
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            print_mode("DESKTOP", mode);
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        } else {
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            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    DESKTOP: failed to query (%s)\n", SDL_GetError());
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        }
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        for (m = 0; m < num_modes; m++) {
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            char prefix[64];
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            (void)SDL_snprintf(prefix, sizeof(prefix), "    MODE %d", m);
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            print_mode(prefix, modes[m]);
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        }
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        SDL_free(modes);
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        SDL_Log("\n");
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    }
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    SDL_free(displays);
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    SDL_Quit();
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    SDLTest_CommonDestroyState(state);
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    return 0;
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}
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