testdisplayinfo.c File Reference

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

Include dependency graph for testdisplayinfo.c:

Go to the source code of this file.

Functions
static void	print_mode (const char *prefix, const SDL_DisplayMode *mode)
int	main (int argc, char *argv[])

Function Documentation

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 32 of file testdisplayinfo.c.

References dpy, SDL_Rect::h, print_mode(), rect, SDL_GetCurrentDisplayMode, SDL_GetCurrentVideoDriver, SDL_GetDesktopDisplayMode, SDL_GetDisplayBounds, SDL_GetDisplayDPI, SDL_GetDisplayMode, SDL_GetDisplayName, SDL_GetError, SDL_GetNumDisplayModes, SDL_GetNumVideoDisplays, SDL_Init, SDL_INIT_VIDEO, SDL_Log, SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO, SDL_LogError, SDL_LogSetPriority, SDL_Quit, SDL_snprintf, SDL_Rect::w, SDL_Rect::x, and SDL_Rect::y.

{
    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;
}

static void print_mode ( const char *  prefix, const SDL_DisplayMode *  mode  )

static

Definition at line 21 of file testdisplayinfo.c.

References SDL_DisplayMode::format, SDL_DisplayMode::h, SDL_DisplayMode::refresh_rate, SDL_GetPixelFormatName, SDL_Log, and SDL_DisplayMode::w.

Referenced by main().

{
    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);
}