1 /*
2 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
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 "SDL.h"
16
17 #include <stdio.h>
18 #include <stdlib.h>
19
20 static void
print_mode(const char * prefix,const SDL_DisplayMode * mode)21 print_mode(const char *prefix, const SDL_DisplayMode *mode)
22 {
23 if (!mode)
24 return;
25
26 SDL_Log("%s: fmt=%s w=%d h=%d refresh=%d\n",
27 prefix, SDL_GetPixelFormatName(mode->format),
28 mode->w, mode->h, mode->refresh_rate);
29 }
30
31 int
main(int argc,char * argv[])32 main(int argc, char *argv[])
33 {
34 SDL_DisplayMode mode;
35 int num_displays, dpy;
36
37 /* Enable standard application logging */
38 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
39
40 /* Load the SDL library */
41 if (SDL_Init(SDL_INIT_VIDEO) < 0) {
42 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
43 return 1;
44 }
45
46 SDL_Log("Using video target '%s'.\n", SDL_GetCurrentVideoDriver());
47 num_displays = SDL_GetNumVideoDisplays();
48
49 SDL_Log("See %d displays.\n", num_displays);
50
51 for (dpy = 0; dpy < num_displays; dpy++) {
52 const int num_modes = SDL_GetNumDisplayModes(dpy);
53 SDL_Rect rect = { 0, 0, 0, 0 };
54 float ddpi, hdpi, vdpi;
55 int m;
56
57 SDL_GetDisplayBounds(dpy, &rect);
58 SDL_Log("%d: \"%s\" (%dx%d, (%d, %d)), %d modes.\n", dpy, SDL_GetDisplayName(dpy), rect.w, rect.h, rect.x, rect.y, num_modes);
59
60 if (SDL_GetDisplayDPI(dpy, &ddpi, &hdpi, &vdpi) == -1) {
61 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DPI: failed to query (%s)\n", SDL_GetError());
62 } else {
63 SDL_Log(" DPI: ddpi=%f; hdpi=%f; vdpi=%f\n", ddpi, hdpi, vdpi);
64 }
65
66 if (SDL_GetCurrentDisplayMode(dpy, &mode) == -1) {
67 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " CURRENT: failed to query (%s)\n", SDL_GetError());
68 } else {
69 print_mode("CURRENT", &mode);
70 }
71
72 if (SDL_GetDesktopDisplayMode(dpy, &mode) == -1) {
73 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DESKTOP: failed to query (%s)\n", SDL_GetError());
74 } else {
75 print_mode("DESKTOP", &mode);
76 }
77
78 for (m = 0; m < num_modes; m++) {
79 if (SDL_GetDisplayMode(dpy, m, &mode) == -1) {
80 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " MODE %d: failed to query (%s)\n", m, SDL_GetError());
81 } else {
82 char prefix[64];
83 SDL_snprintf(prefix, sizeof (prefix), " MODE %d", m);
84 print_mode(prefix, &mode);
85 }
86 }
87
88 SDL_Log("\n");
89 }
90
91 SDL_Quit();
92 return 0;
93 }
94
95 /* vi: set ts=4 sw=4 expandtab: */
96
97