24fec13ac1
SDL_DisplayMode now includes the pixel size, the screen size and the relationship between the two. For example, a 4K display at 200% scale could have a pixel size of 3840x2160, a screen size of 1920x1080, and a display scale of 2.0.
94 lines
3 KiB
C
94 lines
3 KiB
C
/*
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Program to test querying of display info */
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#include <stdlib.h>
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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static void
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print_mode(const char *prefix, const SDL_DisplayMode *mode)
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{
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if (mode == NULL) {
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return;
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}
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SDL_Log("%s: fmt=%s w=%d h=%d scale=%d%% refresh=%gHz\n",
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prefix, SDL_GetPixelFormatName(mode->format),
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mode->pixel_w, mode->pixel_h, (int)(mode->display_scale * 100.0f), mode->refresh_rate);
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}
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int main(int argc, char *argv[])
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{
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SDL_DisplayMode mode;
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int num_displays, dpy;
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Load the SDL library */
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if (SDL_Init(SDL_INIT_VIDEO) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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return 1;
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}
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SDL_Log("Using video target '%s'.\n", SDL_GetCurrentVideoDriver());
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num_displays = SDL_GetNumVideoDisplays();
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SDL_Log("See %d displays.\n", num_displays);
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for (dpy = 0; dpy < num_displays; dpy++) {
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const int num_modes = SDL_GetNumDisplayModes(dpy);
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SDL_Rect rect = { 0, 0, 0, 0 };
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float ddpi, hdpi, vdpi;
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int m;
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SDL_GetDisplayBounds(dpy, &rect);
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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);
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if (SDL_GetDisplayPhysicalDPI(dpy, &ddpi, &hdpi, &vdpi) == -1) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DPI: failed to query (%s)\n", SDL_GetError());
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} else {
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SDL_Log(" DPI: ddpi=%f; hdpi=%f; vdpi=%f\n", ddpi, hdpi, vdpi);
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}
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if (SDL_GetCurrentDisplayMode(dpy, &mode) == -1) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " CURRENT: failed to query (%s)\n", SDL_GetError());
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} else {
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print_mode("CURRENT", &mode);
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}
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if (SDL_GetDesktopDisplayMode(dpy, &mode) == -1) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " DESKTOP: failed to query (%s)\n", SDL_GetError());
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} else {
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print_mode("DESKTOP", &mode);
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}
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for (m = 0; m < num_modes; m++) {
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if (SDL_GetDisplayMode(dpy, m, &mode) == -1) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, " MODE %d: failed to query (%s)\n", m, SDL_GetError());
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} else {
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char prefix[64];
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(void)SDL_snprintf(prefix, sizeof prefix, " MODE %d", m);
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print_mode(prefix, &mode);
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}
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}
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SDL_Log("\n");
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}
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SDL_Quit();
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return 0;
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}
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