sdl

FORK: Simple Directmedia Layer
git clone https://git.neptards.moe/neptards/sdl.git
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testdisplayinfo.c (3002B)

      1 /*
      2   Copyright (C) 1997-2020 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
     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
     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