SDL2 Unreal start up sample code.

main.cpp

#include <iostream>
#include <SDL.h>

int main()
{
//	uint32_t windowStyleSDL = SDL_WINDOW_VULKAN;
	SDL_SetHint("SDL_VIDEO_X11_REQUIRE_XRANDR", "1");  // workaround for misbuilt SDL libraries on X11.
	
//	SDL_SetHint(SDL_HINT_MOUSE_RELATIVE_MODE_SHOW_CURSOR, "1"); // When relative mouse mode is acive, don't hide cursor.
	SDL_SetHint(SDL_HINT_MOUSE_RELATIVE_MODE_WARP, "0"); // Don't warp the cursor to the center in relative mouse mode.
	
	if (SDL_Init((SDL_INIT_EVERYTHING ^ SDL_INIT_AUDIO) | SDL_INIT_NOPARACHUTE) != 0)
		std::cout << "SDL could not be inited.\n";
	
	SDL_version CompileTimeSDLVersion;
	SDL_version RunTimeSDLVersion;
	SDL_VERSION(&CompileTimeSDLVersion);
	SDL_GetVersion(&RunTimeSDLVersion);
	int SdlRevisionNum = SDL_GetRevisionNumber();
	const char *SdlRevision = SDL_GetRevision();
	std::cout <<  "Init SDL version: " << (unsigned int)RunTimeSDLVersion.major << "."
		<< (unsigned int)RunTimeSDLVersion.minor << "." << (unsigned int)RunTimeSDLVersion.patch
		<< " revision: " << SdlRevisionNum << " (" << SdlRevision << ") (compiled against: " << (unsigned int)CompileTimeSDLVersion.major
		<< "." << (unsigned int)CompileTimeSDLVersion.minor << "."
		<< (unsigned int)CompileTimeSDLVersion.patch << ")\n";
	
	const char *SdlVideoDriver = SDL_GetCurrentVideoDriver();
	if (SdlVideoDriver)
		std::cout << "Using SDL video driver: " << SdlVideoDriver << "\n";
	
	SDL_StartTextInput();
	
	const char *title = "Title";
	const char *message = "message";
	SDL_MessageBoxButtonData *buttons = new SDL_MessageBoxButtonData[2];
	buttons[0].flags = SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT;
	buttons[0].text = "Yes";
	buttons[0].buttonid = 1;
	buttons[1].flags = SDL_MESSAGEBOX_BUTTON_ESCAPEKEY_DEFAULT;
	buttons[1].text = "No";
	buttons[1].buttonid = 0;
	
	SDL_MessageBoxData messageBoxData =
	{
			SDL_MESSAGEBOX_INFORMATION,
			NULL,
			title,
			message,
			2,
			buttons,
			NULL
	};
	
	int buttonPressed = -1;
	if (SDL_ShowMessageBox(&messageBoxData, &buttonPressed) == -1)
		std::cout << "Messagebox could not be shown\n";
	
	return 0;
}