Atlas - testdisplayinfo.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
3
4  This software is provided 'as-is', without any express or implied
5  warranty.  In no event will the authors be held liable for any damages
6  arising from the use of this software.
7
8  Permission is granted to anyone to use this software for any purpose,
9  including commercial applications, and to alter it and redistribute it
10  freely.
11*/
12
13/* Program to test querying of display info */
14
15#include <stdlib.h>
16
17#include <SDL3/SDL.h>
18#include <SDL3/SDL_main.h>
19#include <SDL3/SDL_test.h>
20
21static void
22print_mode(const char *prefix, const SDL_DisplayMode *mode)
23{
24    if (!mode) {
25        return;
26    }
27
28    SDL_Log("%s: %dx%d@%gx, %gHz, fmt=%s",
29            prefix,
30            mode->w, mode->h, mode->pixel_density, mode->refresh_rate,
31            SDL_GetPixelFormatName(mode->format));
32}
33
34int main(int argc, char *argv[])
35{
36    SDL_DisplayID *displays;
37    SDL_DisplayMode **modes;
38    const SDL_DisplayMode *mode;
39    int num_displays, i;
40    SDLTest_CommonState *state;
41
42    /* Initialize test framework */
43    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
44    if (!state) {
45        return 1;
46    }
47
48    /* Parse commandline */
49    if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
50        return 1;
51    }
52
53    /* Load the SDL library */
54    if (!SDL_Init(SDL_INIT_VIDEO)) {
55        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s", SDL_GetError());
56        return 1;
57    }
58
59    SDL_Log("Using video target '%s'.", SDL_GetCurrentVideoDriver());
60    displays = SDL_GetDisplays(&num_displays);
61
62    SDL_Log("See %d displays.", num_displays);
63
64    for (i = 0; i < num_displays; i++) {
65        SDL_DisplayID dpy = displays[i];
66        SDL_PropertiesID props = SDL_GetDisplayProperties(dpy);
67        SDL_Rect rect = { 0, 0, 0, 0 };
68        int m, num_modes = 0;
69        const bool has_HDR = SDL_GetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, false);
70
71        SDL_GetDisplayBounds(dpy, &rect);
72        modes = SDL_GetFullscreenDisplayModes(dpy, &num_modes);
73        SDL_Log("%" SDL_PRIu32 ": \"%s\" (%dx%d at %d,%d), content scale %.2f, %d fullscreen modes, HDR capable: %s.", dpy, SDL_GetDisplayName(dpy), rect.w, rect.h, rect.x, rect.y, SDL_GetDisplayContentScale(dpy), num_modes, has_HDR ? "yes" : "no");
74
75        mode = SDL_GetCurrentDisplayMode(dpy);
76        if (mode) {
77            print_mode("CURRENT", mode);
78        } else {
79            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    CURRENT: failed to query (%s)", SDL_GetError());
80        }
81
82        mode = SDL_GetDesktopDisplayMode(dpy);
83        if (mode) {
84            print_mode("DESKTOP", mode);
85        } else {
86            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    DESKTOP: failed to query (%s)", SDL_GetError());
87        }
88
89        for (m = 0; m < num_modes; m++) {
90            char prefix[64];
91            (void)SDL_snprintf(prefix, sizeof(prefix), "    MODE %d", m);
92            print_mode(prefix, modes[m]);
93        }
94        SDL_free(modes);
95
96        SDL_Log("%s", "");
97    }
98    SDL_free(displays);
99
100    SDL_Quit();
101    SDLTest_CommonDestroyState(state);
102    return 0;
103}
104
[FILE END]
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