test/testdisplayinfo.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 07 Dec 2017 16:08:09 -0800
changeset 11730 ac6c607e065c
parent 10737 3406a0f8b041
child 11811 5d94cb6b24d3
permissions -rw-r--r--
Enable building the Metal renderer by default, and weak link the Metal framework so the SDL library is safe to use on older Macs
Also generate iOS versions of the Metal shaders
     1 /*
     2   Copyright (C) 1997-2017 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