test/testdisplayinfo.c
author Ryan C. Gordon <icculus@icculus.org>
Fri, 12 Aug 2016 19:59:00 -0400
changeset 10266 c09f06c4e8c8
parent 10038 2bab6f8d403e
permissions -rw-r--r--
emscripten: send fake mouse events for touches, like other targets do. (This really should be handled at the higher level and not in the individual targets, but this fixes the immediate bug.)

/*
  Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages
  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,
  including commercial applications, and to alter it and redistribute it
  freely.
*/

/* Program to test querying of display info */

#include "SDL.h"

#include <stdio.h>
#include <stdlib.h>

static void
print_mode(const char *prefix, const SDL_DisplayMode *mode)
{
    if (!mode)
        return;

    SDL_Log("%s: fmt=%s w=%d h=%d refresh=%d\n",
            prefix, SDL_GetPixelFormatName(mode->format),
            mode->w, mode->h, mode->refresh_rate);
}

int
main(int argc, char *argv[])
{
    SDL_DisplayMode mode;
    int num_displays, dpy;

    /* Enable standard application logging */
    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);

    /* Load the SDL library */
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
        return 1;
    }

    SDL_Log("Using video target '%s'.\n", SDL_GetCurrentVideoDriver());
    num_displays = SDL_GetNumVideoDisplays();

    SDL_Log("See %d displays.\n", num_displays);

    for (dpy = 0; dpy < num_displays; dpy++) {
        const int num_modes = SDL_GetNumDisplayModes(dpy);
        SDL_Rect rect = { 0, 0, 0, 0 };
        float ddpi, hdpi, vdpi;
        int m;

        SDL_GetDisplayBounds(dpy, &rect);
        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);

        if (SDL_GetDisplayDPI(dpy, &ddpi, &hdpi, &vdpi) == -1) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    DPI: failed to query (%s)\n", SDL_GetError());
        } else {
            SDL_Log("    DPI: ddpi=%f; hdpi=%f; vdpi=%f\n", ddpi, hdpi, vdpi);
        }

        if (SDL_GetCurrentDisplayMode(dpy, &mode) == -1) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    CURRENT: failed to query (%s)\n", SDL_GetError());
        } else {
            print_mode("CURRENT", &mode);
        }

        if (SDL_GetDesktopDisplayMode(dpy, &mode) == -1) {
            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    DESKTOP: failed to query (%s)\n", SDL_GetError());
        } else {
            print_mode("DESKTOP", &mode);
        }

        for (m = 0; m < num_modes; m++) {
            if (SDL_GetDisplayMode(dpy, m, &mode) == -1) {
                SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "    MODE %d: failed to query (%s)\n", m, SDL_GetError());
            } else {
                char prefix[64];
                SDL_snprintf(prefix, sizeof (prefix), "    MODE %d", m);
                print_mode(prefix, &mode);
            }
        }

        SDL_Log("\n");
    }

    SDL_Quit();
    return 0;
}

/* vi: set ts=4 sw=4 expandtab: */