/*

Simple DirectMedia Layer

Copyright (C) 1997-2014 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, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#include "./SDL_internal.h"

#if defined(__WIN32__)

#include "core/windows/SDL_windows.h"

#endif

/* Initialization code for SDL */

#include "SDL.h"

#include "SDL_bits.h"

#include "SDL_revision.h"

#include "SDL_assert_c.h"

#include "events/SDL_events_c.h"

#include "haptic/SDL_haptic_c.h"

#include "joystick/SDL_joystick_c.h"

/* Initialization/Cleanup routines */

#if !SDL_TIMERS_DISABLED

extern int SDL_TimerInit(void);

extern void SDL_TimerQuit(void);

extern void SDL_TicksInit(void);

extern void SDL_TicksQuit(void);

#endif

#if SDL_VIDEO_DRIVER_WINDOWS

extern int SDL_HelperWindowCreate(void);

extern int SDL_HelperWindowDestroy(void);

#endif

/* The initialized subsystems */

#ifdef SDL_MAIN_NEEDED

static SDL_bool SDL_MainIsReady = SDL_FALSE;

#else

static SDL_bool SDL_MainIsReady = SDL_TRUE;

#endif

static SDL_bool SDL_bInMainQuit = SDL_FALSE;

static Uint8 SDL_SubsystemRefCount[ 32 ];

/* Private helper to increment a subsystem's ref counter. */

static void

SDL_PrivateSubsystemRefCountIncr(Uint32 subsystem)

{

int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);

SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);

++SDL_SubsystemRefCount[subsystem_index];

}

/* Private helper to decrement a subsystem's ref counter. */

static void

SDL_PrivateSubsystemRefCountDecr(Uint32 subsystem)

{

int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);

if (SDL_SubsystemRefCount[subsystem_index] > 0) {

--SDL_SubsystemRefCount[subsystem_index];

}

}

/* Private helper to check if a system needs init. */

static SDL_bool

SDL_PrivateShouldInitSubsystem(Uint32 subsystem)

{

int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);

SDL_assert(SDL_SubsystemRefCount[subsystem_index] < 255);

return (SDL_SubsystemRefCount[subsystem_index] == 0);

}

/* Private helper to check if a system needs to be quit. */

static SDL_bool

SDL_PrivateShouldQuitSubsystem(Uint32 subsystem) {

int subsystem_index = SDL_MostSignificantBitIndex32(subsystem);

if (SDL_SubsystemRefCount[subsystem_index] == 0) {

return SDL_FALSE;

}

/* If we're in SDL_Quit, we shut down every subsystem, even if refcount

* isn't zero.

*/

return SDL_SubsystemRefCount[subsystem_index] == 1 || SDL_bInMainQuit;

}

void

SDL_SetMainReady(void)

{

SDL_MainIsReady = SDL_TRUE;

}

int

SDL_InitSubSystem(Uint32 flags)

{

if (!SDL_MainIsReady) {

SDL_SetError("Application didn't initialize properly, did you include SDL_main.h in the file containing your main() function?");

return -1;

}

/* Clear the error message */

SDL_ClearError();

#if SDL_VIDEO_DRIVER_WINDOWS

if ((flags & (SDL_INIT_HAPTIC|SDL_INIT_JOYSTICK))) {

if (SDL_HelperWindowCreate() < 0) {

return -1;

}

}

#endif

#if !SDL_TIMERS_DISABLED

SDL_TicksInit();

#endif

if ((flags & SDL_INIT_GAMECONTROLLER)) {

/* game controller implies joystick */

flags |= SDL_INIT_JOYSTICK;

}

if ((flags & (SDL_INIT_VIDEO|SDL_INIT_JOYSTICK))) {

/* video or joystick implies events */

flags |= SDL_INIT_EVENTS;

}

/* Initialize the event subsystem */

if ((flags & SDL_INIT_EVENTS)) {

#if !SDL_EVENTS_DISABLED

if (SDL_PrivateShouldInitSubsystem(SDL_INIT_EVENTS)) {

if (SDL_StartEventLoop() < 0) {

return (-1);

}

SDL_QuitInit();

}

SDL_PrivateSubsystemRefCountIncr(SDL_INIT_EVENTS);

#else

return SDL_SetError("SDL not built with events support");

#endif

}

/* Initialize the timer subsystem */

if ((flags & SDL_INIT_TIMER)){

#if !SDL_TIMERS_DISABLED

if (SDL_PrivateShouldInitSubsystem(SDL_INIT_TIMER)) {

if (SDL_TimerInit() < 0) {

return (-1);

}

}

SDL_PrivateSubsystemRefCountIncr(SDL_INIT_TIMER);

#else

return SDL_SetError("SDL not built with timer support");

#endif

}

/* Initialize the video subsystem */

if ((flags & SDL_INIT_VIDEO)){

#if !SDL_VIDEO_DISABLED

if (SDL_PrivateShouldInitSubsystem(SDL_INIT_VIDEO)) {

if (SDL_VideoInit(NULL) < 0) {

return (-1);

}

}

SDL_PrivateSubsystemRefCountIncr(SDL_INIT_VIDEO);

#else

return SDL_SetError("SDL not built with video support");

#endif

}

/* Initialize the audio subsystem */

if ((flags & SDL_INIT_AUDIO)){

#if !SDL_AUDIO_DISABLED

if (SDL_PrivateShouldInitSubsystem(SDL_INIT_AUDIO)) {

if (SDL_AudioInit(NULL) < 0) {

return (-1);

}

}

SDL_PrivateSubsystemRefCountIncr(SDL_INIT_AUDIO);

#else

return SDL_SetError("SDL not built with audio support");

#endif

}

/* Initialize the joystick subsystem */

if ((flags & SDL_INIT_JOYSTICK)){

#if !SDL_JOYSTICK_DISABLED

if (SDL_PrivateShouldInitSubsystem(SDL_INIT_JOYSTICK)) {

if (SDL_JoystickInit() < 0) {

return (-1);

}

}

SDL_PrivateSubsystemRefCountIncr(SDL_INIT_JOYSTICK);

#else

return SDL_SetError("SDL not built with joystick support");

#endif

}

if ((flags & SDL_INIT_GAMECONTROLLER)){

#if !SDL_JOYSTICK_DISABLED

if (SDL_PrivateShouldInitSubsystem(SDL_INIT_GAMECONTROLLER)) {

if (SDL_GameControllerInit() < 0) {

return (-1);

}

}

SDL_PrivateSubsystemRefCountIncr(SDL_INIT_GAMECONTROLLER);

#else

return SDL_SetError("SDL not built with joystick support");

#endif

}

/* Initialize the haptic subsystem */

if ((flags & SDL_INIT_HAPTIC)){

#if !SDL_HAPTIC_DISABLED

if (SDL_PrivateShouldInitSubsystem(SDL_INIT_HAPTIC)) {

if (SDL_HapticInit() < 0) {

return (-1);

}

}

SDL_PrivateSubsystemRefCountIncr(SDL_INIT_HAPTIC);

#else

return SDL_SetError("SDL not built with haptic (force feedback) support");

#endif

}

return (0);

}

int

SDL_Init(Uint32 flags)

{

return SDL_InitSubSystem(flags);

}

void

SDL_QuitSubSystem(Uint32 flags)

{

/* Shut down requested initialized subsystems */

#if !SDL_JOYSTICK_DISABLED

if ((flags & SDL_INIT_GAMECONTROLLER)) {

/* game controller implies joystick */

flags |= SDL_INIT_JOYSTICK;

if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_GAMECONTROLLER)) {

SDL_GameControllerQuit();

}

SDL_PrivateSubsystemRefCountDecr(SDL_INIT_GAMECONTROLLER);

}

if ((flags & SDL_INIT_JOYSTICK)) {

/* joystick implies events */

flags |= SDL_INIT_EVENTS;

if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_JOYSTICK)) {

SDL_JoystickQuit();

}

SDL_PrivateSubsystemRefCountDecr(SDL_INIT_JOYSTICK);

}

#endif

#if !SDL_HAPTIC_DISABLED

if ((flags & SDL_INIT_HAPTIC)) {

if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_HAPTIC)) {

SDL_HapticQuit();

}

SDL_PrivateSubsystemRefCountDecr(SDL_INIT_HAPTIC);

}

#endif

#if !SDL_AUDIO_DISABLED

if ((flags & SDL_INIT_AUDIO)) {

if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_AUDIO)) {

SDL_AudioQuit();

}

SDL_PrivateSubsystemRefCountDecr(SDL_INIT_AUDIO);

}

#endif

#if !SDL_VIDEO_DISABLED

if ((flags & SDL_INIT_VIDEO)) {

/* video implies events */

flags |= SDL_INIT_EVENTS;

if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_VIDEO)) {

SDL_VideoQuit();

}

SDL_PrivateSubsystemRefCountDecr(SDL_INIT_VIDEO);

}

#endif

#if !SDL_TIMERS_DISABLED

if ((flags & SDL_INIT_TIMER)) {

if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_TIMER)) {

SDL_TimerQuit();

}

SDL_PrivateSubsystemRefCountDecr(SDL_INIT_TIMER);

}

#endif

#if !SDL_EVENTS_DISABLED

if ((flags & SDL_INIT_EVENTS)) {

if (SDL_PrivateShouldQuitSubsystem(SDL_INIT_EVENTS)) {

SDL_QuitQuit();

SDL_StopEventLoop();

}

SDL_PrivateSubsystemRefCountDecr(SDL_INIT_EVENTS);

}

#endif

}

Uint32

SDL_WasInit(Uint32 flags)

{

int i;

int num_subsystems = SDL_arraysize(SDL_SubsystemRefCount);

Uint32 initialized = 0;

if (!flags) {

flags = SDL_INIT_EVERYTHING;

}

num_subsystems = SDL_min(num_subsystems, SDL_MostSignificantBitIndex32(flags) + 1);

/* Iterate over each bit in flags, and check the matching subsystem. */

for (i = 0; i < num_subsystems; ++i) {

if ((flags & 1) && SDL_SubsystemRefCount[i] > 0) {

initialized |= (1 << i);

}

flags >>= 1;

}

return initialized;

}

void

SDL_Quit(void)

{

SDL_bInMainQuit = SDL_TRUE;

/* Quit all subsystems */

#if SDL_VIDEO_DRIVER_WINDOWS

SDL_HelperWindowDestroy();

#endif

SDL_QuitSubSystem(SDL_INIT_EVERYTHING);

#if !SDL_TIMERS_DISABLED

SDL_TicksQuit();

#endif

SDL_ClearHints();

SDL_AssertionsQuit();

SDL_LogResetPriorities();

/* Now that every subsystem has been quit, we reset the subsystem refcount

* and the list of initialized subsystems.

*/

SDL_memset( SDL_SubsystemRefCount, 0x0, sizeof(SDL_SubsystemRefCount) );

SDL_bInMainQuit = SDL_FALSE;

}

/* Get the library version number */

void

SDL_GetVersion(SDL_version * ver)

{

SDL_VERSION(ver);

}

/* Get the library source revision */

const char *

SDL_GetRevision(void)

{

return SDL_REVISION;

}

/* Get the library source revision number */

int

SDL_GetRevisionNumber(void)

{

return SDL_REVISION_NUMBER;

}

/* Get the name of the platform */

const char *

SDL_GetPlatform()

{

#if __AIX__

return "AIX";

#elif __ANDROID__

return "Android";

#elif __BSDI__

return "BSDI";

#elif __DREAMCAST__

return "Dreamcast";

#elif __FREEBSD__

return "FreeBSD";

#elif __HAIKU__

return "Haiku";

#elif __HPUX__

return "HP-UX";

#elif __IRIX__

return "Irix";

#elif __LINUX__

return "Linux";

#elif __MINT__

return "Atari MiNT";

#elif __MACOS__

return "MacOS Classic";

#elif __MACOSX__

return "Mac OS X";

#elif __NACL__

return "NaCl";

#elif __NETBSD__

return "NetBSD";

#elif __OPENBSD__

return "OpenBSD";

#elif __OS2__

return "OS/2";

#elif __OSF__

return "OSF/1";

#elif __QNXNTO__

return "QNX Neutrino";

#elif __RISCOS__

return "RISC OS";

#elif __SOLARIS__

return "Solaris";

#elif __WIN32__

return "Windows";

#elif __IPHONEOS__

return "iOS";

#elif __PSP__

return "PlayStation Portable";

#else

return "Unknown (see SDL_platform.h)";

#endif

}

#if defined(__WIN32__)

#if !defined(HAVE_LIBC) || (defined(__WATCOMC__) && defined(BUILD_DLL))

/* Need to include DllMain() on Watcom C for some reason.. */

BOOL APIENTRY

_DllMainCRTStartup(HANDLE hModule,

DWORD ul_reason_for_call, LPVOID lpReserved)

{

switch (ul_reason_for_call) {

case DLL_PROCESS_ATTACH:

case DLL_THREAD_ATTACH:

case DLL_THREAD_DETACH:

case DLL_PROCESS_DETACH:

break;

}

return TRUE;

}

#endif /* building DLL with Watcom C */

#endif /* __WIN32__ */

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