vbagx/source/vbasupport.cpp

/****************************************************************************
 * Visual Boy Advance GX
 *
 * Tantric 2008-2023
 *
 * vbasupport.cpp
 *
 * VBA support code
 ***************************************************************************/

#include <gccore.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wiiuse/wpad.h>
#include <malloc.h>
#include <ogc/lwp_watchdog.h>

#include <sys/stat.h>
#include <errno.h>

#include "vbagx.h"
#include "fileop.h"
#include "filebrowser.h"
#include "audio.h"
#include "vmmem.h"
#include "input.h"
#include "gameinput.h"
#include "video.h"
#include "menu.h"
#include "gcunzip.h"
#include "gamesettings.h"
#include "preferences.h"
#include "fastmath.h"
#include "utils/pngu.h"

#include "vba/Util.h"
#include "vba/common/Port.h"
#include "vba/common/Patch.h"
#include "vba/gba/Flash.h"
#include "vba/gba/RTC.h"
#include "vba/gba/Sound.h"
#include "vba/gba/Cheats.h"
#include "vba/gba/GBA.h"
#include "vba/gba/agbprint.h"
#include "vba/gb/gb.h"
#include "vba/gb/gbGlobals.h"
#include "vba/gb/gbCheats.h"
#include "vba/gb/gbSound.h"

#include "goomba/goombarom.h"
#include "goomba/goombasav.h"

static u32 start;
int cartridgeType = 0;
u32 RomIdCode;
char RomTitle[17];

int SunBars = 3;
bool TiltSideways = false;

/****************************************************************************
 * VBA Globals
 ***************************************************************************/

int systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

int systemDebug = 0;
int emulating = 0;

int systemFrameSkip = 0;
int systemVerbose = 0;

int systemRedShift = 0;
int systemBlueShift = 0;
int systemGreenShift = 0;
int systemColorDepth = 0;
u16 systemGbPalette[24];
u16 systemColorMap16[0x10000];
u32 *systemColorMap32 = NULL;

void gbSetPalette(u32 RRGGBB[]);
bool StartColorizing();
void StopColorizing();
extern bool ColorizeGameboy;
extern u16 systemMonoPalette[14];
void gbSetBgPal(u8 WhichPal, u32 bright, u32 medium, u32 dark, u32 black=0x000000);
void gbSetSpritePal(u8 WhichPal, u32 bright, u32 medium, u32 dark);

struct EmulatedSystem emulator =
{
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	false,
	0
};

/****************************************************************************
* systemGetClock
*
* Returns number of milliseconds since program start
****************************************************************************/
u32 systemGetClock( void )
{
	u32 now = gettime();
	return diff_usec(start, now) / 1000;
}

void systemFrame() {}
void systemScreenCapture(int a) {}
void systemShowSpeed(int speed) {}
void systemGbBorderOn() {}

bool systemPauseOnFrame()
{
	return false;
}

static u32 lastTime = 0;
#define RATE60HZ 166666.67 // 1/6 second or 166666.67 usec

void system10Frames(int rate)
{
	u32 time = gettime();
	u32 diff = diff_usec(lastTime, time);

	// expected diff - actual diff
	u32 timeOff = RATE60HZ - diff;

	if(timeOff > 0 && timeOff < 100000) // we're running ahead!
		usleep(timeOff); // let's take a nap
	else
		timeOff = 0; // timeoff was not valid

	int speed = (RATE60HZ/diff)*100;

	if (cartridgeType == 2) // GBA games require frameskipping
	{
		if (!GCSettings.gbaFrameskip)
		{
			systemFrameSkip = 0;
		}
		else
		{
			// consider increasing skip
			if(speed < 60)
				systemFrameSkip += 4;
			else if(speed < 70)
				systemFrameSkip += 3;
			else if(speed < 80)
				systemFrameSkip += 2;
			else if(speed < 98)
				++systemFrameSkip;

			// consider decreasing skip
			else if(speed > 185)
				systemFrameSkip -= 3;
			else if(speed > 145)
				systemFrameSkip -= 2;
			else if(speed > 125)
				systemFrameSkip -= 1;

			// correct invalid frame skip values
			if(systemFrameSkip > 20)
				systemFrameSkip = 20;
			else if(systemFrameSkip < 0)
				systemFrameSkip = 0;
		}
	}
	lastTime = gettime();
}

/****************************************************************************
* System
****************************************************************************/

void systemGbPrint(u8 *data,int pages,int feed,int palette, int contrast) {}
void debuggerOutput(const char *s, u32 addr) {}
void (*dbgOutput)(const char *s, u32 addr) = debuggerOutput;
void systemMessage(int num, const char *msg, ...) {}

bool MemCPUReadBatteryFile(char * membuffer, int size)
{
	systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

	if(size == 512 || size == 0x2000)
	{
		memcpy(eepromData, membuffer, size);
	}
	else
	{
		if(size == 0x20000)
		{
			memcpy(flashSaveMemory, membuffer, 0x20000);
			flashSetSize(0x20000);
		}
		else
		{
			memcpy(flashSaveMemory, membuffer, 0x10000);
			flashSetSize(0x10000);
		}
	}
	return true;
}

extern int gbaSaveType;

int MemCPUWriteBatteryFile(char * membuffer)
{
	int result = 0;
	if(gbaSaveType == 0)
	{
		if(eepromInUse)
			gbaSaveType = 3;
		else
			switch(saveType)
			{
			case 1:
				gbaSaveType = 1;
				break;
			case 2:
				gbaSaveType = 2;
				break;
			}
	}

	if((gbaSaveType) && (gbaSaveType!=5))
	{
		// only save if Flash/Sram in use or EEprom in use
		if(gbaSaveType != 3)
		{
			if(gbaSaveType == 2)
			{
				memcpy(membuffer, flashSaveMemory, flashSize);
				result = flashSize;
			}
			else
			{
				memcpy(membuffer, flashSaveMemory, 0x10000);
				result = 0x10000;
			}
		}
		else
		{
			memcpy(membuffer, eepromData, eepromSize);
			result = eepromSize;
		}
	}
	return result;
}

/****************************************************************************
* LoadBatteryOrState
* Load Battery/State file into memory
* action = FILE_SRAM - Load battery
* action = FILE_SNAPSHOT - Load state
****************************************************************************/

bool LoadBatteryOrState(char * filepath, int action, bool silent)
{
	bool result = false;
	int offset = 0;
	int device;
		
	if(!FindDevice(filepath, &device))
		return 0;

	AllocSaveBuffer();

	// load the file into savebuffer
	offset = LoadFile(filepath, silent);
			
	if (cartridgeType == 1 && goomba_is_sram(savebuffer)) {
		void* cleaned = goomba_cleanup(savebuffer);
		if (savebuffer == NULL) {
			ErrorPrompt(goomba_last_error());
			offset = 0;
		} else {
			if (cleaned != savebuffer) {
				memcpy(savebuffer, cleaned, GOOMBA_COLOR_SRAM_SIZE);
				free(cleaned);
			}
			stateheader* sh = stateheader_for(savebuffer, RomTitle);
			if (sh == NULL) {
				ErrorPrompt(goomba_last_error());
				offset = 0;
			} else {
				goomba_size_t outsize;
				void* gbc_sram = goomba_extract(savebuffer, sh, &outsize);
				if (gbc_sram == NULL) {
					ErrorPrompt(goomba_last_error());
					offset = 0;
				} else {
					memcpy(savebuffer, gbc_sram, outsize);
					offset = outsize;
					free(gbc_sram);
				}
			}
		}
	}
	// load savebuffer into VBA memory
	if (offset > 0)
	{
		if(action == FILE_SRAM)
		{
			if(cartridgeType == 1)
				result = MemgbReadBatteryFile((char *)savebuffer, offset);
			else
				result = MemCPUReadBatteryFile((char *)savebuffer, offset);
		}
		else
		{
			result = emulator.emuReadMemState((char *)savebuffer, offset);
		}
	}

	FreeSaveBuffer();

	if(!silent && !result)
	{
		if(offset == 0)
		{
			if(action == FILE_SRAM)
				ErrorPrompt ("Save file not found");
			else
				ErrorPrompt ("State file not found");
		}
		else
		{
			if(action == FILE_SRAM)
				ErrorPrompt ("Invalid save file");
			else
				ErrorPrompt ("Invalid state file");
		}
	}
	return result;
}

bool LoadBatteryOrStateAuto(int action, bool silent)
{
	char filepath[MAXPATHLEN];
	char filepath2[MAXPATHLEN];

	if(!MakeFilePath(filepath, action, ROMFilename, 0))
		return false;

	if (action==FILE_SRAM)
	{
		if (LoadBatteryOrState(filepath, action, SILENT))
			return true;

		if (!GCSettings.AppendAuto)
			return false;

		// look for file with no number or Auto appended
		if(!MakeFilePath(filepath2, action, ROMFilename, -1))
			return false;

		if(LoadBatteryOrState(filepath2, action, silent))
		{
			// rename this file - append Auto
			rename(filepath2, filepath); // rename file (to avoid duplicates)
			return true;
		}
		return false;
	}
	else
	{
		return LoadBatteryOrState(filepath, action, silent);
	}
}

/****************************************************************************
* SaveBatteryOrState
* Save Battery/State file into memory
* action = 0 - Save battery
* action = 1 - Save state
****************************************************************************/

bool SaveBatteryOrState(char * filepath, int action, bool silent)
{
	bool result = false;
	int offset = 0;
	int datasize = 0; // we need the actual size of the data written
	int device;
	
	if(!FindDevice(filepath, &device))
		return 0;

	if(action == FILE_SNAPSHOT && gameScreenPngSize > 0)
	{
		char screenpath[1024];
		strncpy(screenpath, filepath, 1024);
		screenpath[strlen(screenpath)-4] = 0;
		strcat(screenpath, ".png");
		SaveFile((char *)gameScreenPng, screenpath, gameScreenPngSize, silent);
	}

	AllocSaveBuffer();

	// put VBA memory into savebuffer, sets datasize to size of memory written
	if(action == FILE_SRAM)
	{
		if(cartridgeType == 1)
			datasize = MemgbWriteBatteryFile((char *)savebuffer);
		else
			datasize = MemCPUWriteBatteryFile((char *)savebuffer);
		
		if (cartridgeType == 1) {
			const char* generic_goomba_error = "Cannot save SRAM in Goomba format (did not load correctly.)";
			// check for goomba sram format
			char* old_sram = (char*)malloc(GOOMBA_COLOR_SRAM_SIZE);
			size_t br = LoadFile(old_sram, filepath, GOOMBA_COLOR_SRAM_SIZE, GOOMBA_COLOR_SRAM_SIZE, true);
			if (br >= GOOMBA_COLOR_SRAM_SIZE && goomba_is_sram(old_sram)) {
				void* cleaned = goomba_cleanup(old_sram);
				if (cleaned == NULL) {
					ErrorPrompt(generic_goomba_error);
					datasize = 0;
				} else {
					if (cleaned != old_sram) {
						free(old_sram);
						old_sram = (char*)cleaned;
					}
					stateheader* sh = stateheader_for(old_sram, RomTitle);
					if (sh == NULL) {
						// Game probably doesn't use SRAM
						datasize = 0;
					} else {
						void* new_sram = goomba_new_sav(old_sram, sh, savebuffer, datasize);
						if (new_sram == NULL) {
							ErrorPrompt(goomba_last_error());
							datasize = 0;
						} else {
							memcpy(savebuffer, new_sram, GOOMBA_COLOR_SRAM_SIZE);
							datasize = GOOMBA_COLOR_SRAM_SIZE;
							free(new_sram);
						}
					}
				}
			}
			free(old_sram);
		}
	}
	else
	{
		if(emulator.emuWriteMemState((char *)savebuffer, SAVEBUFFERSIZE))
			datasize = *((int *)(savebuffer+4)) + 8;
	}

	// write savebuffer into file
	if(datasize > 0)
	{
		offset = SaveFile(filepath, datasize, silent);

		if(offset > 0)
		{
			if(!silent)
				InfoPrompt ("Save successful");
			result = true;
		}
	}
	else
	{
		if(!silent)
			InfoPrompt("No data to save!");
	}

	FreeSaveBuffer();

	return result;
}

bool SaveBatteryOrStateAuto(int action, bool silent)
{
	char filepath[1024];

	if(!MakeFilePath(filepath, action, ROMFilename, 0))
		return false;

	return SaveBatteryOrState(filepath, action, silent);
}
/****************************************************************************
 * Save Screenshot / Preview image
 ***************************************************************************/

int SavePreviewImg(char * filepath, bool silent)
{
	int device;
	
	if(!FindDevice(filepath, &device))
		return 0;

	if(gameScreenPngSize > 0)
	{
		char screenpath[1024];
		strcpy(screenpath, filepath);
		screenpath[strlen(screenpath)] = 0;
		strcat(screenpath, ".png");
		SaveFile((char *)gameScreenPng, screenpath, gameScreenPngSize, silent);
	}

	if(!silent)
		InfoPrompt ("Save successful");
	return 1;
}

/****************************************************************************
* Sound
****************************************************************************/

SoundDriver * systemSoundInit()
{
	soundShutdown();
	return new SoundWii();
}

bool systemCanChangeSoundQuality()
{
	return true;
}

void systemOnWriteDataToSoundBuffer(const u16 * finalWave, int length)
{
}

void systemOnSoundShutdown()
{
}

/****************************************************************************
* systemReadJoypads
****************************************************************************/
bool systemReadJoypads()
{
	UpdatePads();
	return true;
}

u32 systemReadJoypad(int which)
{
	if(which == -1) which = 0; // default joypad
	return GetJoy(which);
}

/****************************************************************************
* Motion/Tilt sensor
* Used for games like:
* - Yoshi's Universal Gravitation
* - Kirby's Tilt-N-Tumble
* - Wario Ware Twisted!
*
****************************************************************************/
static int sensorX = 2047;
static int sensorY = 2047;
static int sensorWario = 0x6C0;
static u8 sensorDarkness = 0xE8; // total darkness (including daylight on rainy days)
bool CalibrateWario = false;

int systemGetSensorX()
{
	return sensorX;
}

int systemGetSensorY()
{
	return sensorY;
}

int systemGetSensorZ()
{
	if (CalibrateWario) return 0x6C0;
	else return sensorWario;
}

u8 systemGetSensorDarkness()
{
	return sensorDarkness;
}

void systemUpdateSolarSensor()
{
	u8 sun = 0x0; //sun = 0xE8 - 0xE8 (case 0 and default)

	switch (SunBars)
	{
		case 1:
			sun = 0xE8 -  0xE0;
			break;
		case 2:
			sun = 0xE8 -  0xDA;
			break;
		case 3:
			sun = 0xE8 -  0xD0;
			break;
		case 4:
			sun = 0xE8 -  0xC8;
			break;
		case 5:
			sun = 0xE8 -  0xC0;
			break;
		case 6:
			sun = 0xE8 -  0xB0;
			break;
		case 7:
			sun = 0xE8 -  0xA0;
			break;
		case 8:
			sun = 0xE8 -  0x88;
			break;
		case 9:
			sun = 0xE8 -  0x70;
			break;
		case 10:
			sun = 0xE8 -  0x50;
			break;
		default:
			break;
	}

	struct tm *newtime;
	time_t long_time;

	// regardless of the weather, there should be no sun at night time!
	time(&long_time); // Get time as long integer.
	newtime = localtime(&long_time); // Convert to local time.
	if (newtime->tm_hour > 21 || newtime->tm_hour < 5)
	{
		sun = 0; // total darkness, 9pm - 5am
	}
	else if (newtime->tm_hour > 20 || newtime->tm_hour < 6)
	{
		sun /= 9; // almost total darkness 8pm-9pm, 5am-6am
	}
	else if (newtime->tm_hour > 18 || newtime->tm_hour < 7)
	{
		sun >>= 1;
	}

#ifdef HW_RVL
	// pointing the Gun Del Sol at the ground blocks the sun light,
	// because sometimes you need the shade.
	WPADData *Data = WPAD_Data(0);// first wiimote
	WPADData data = *Data;
	float f = 1.0f;
	if (data.orient.pitch > 0)
	{
		f = 1.0f - (data.orient.pitch/85.0f);
		if (f < 0)
			f = 0;
	}
	sun = int(float(int(sun)) * f);
#endif
	sensorDarkness = 0xE8 - sun;
}

void systemUpdateMotionSensor()
{
#ifdef HW_RVL
	WPADData *Data = WPAD_Data(0); // first wiimote
	WPADData data = *Data;
	static float OldTiltAngle, OldAvg;
	static bool WasFlat = false;
	float DeltaAngle = 0;

	if (TiltSideways)
	{
		sensorY = 2047+(data.gforce.x*50);
		sensorX = 2047+(data.gforce.y*50);
		TiltAngle = ((-data.orient.pitch) + OldTiltAngle)*0.5f;
		OldTiltAngle = -data.orient.pitch;
	}
	else
	{
		sensorX = 2047-(data.gforce.x*50);
		sensorY = 2047+(data.gforce.y*50);
		TiltAngle = ((data.orient.roll) + OldTiltAngle)*0.5f;
		OldTiltAngle = data.orient.roll;
	}
	DeltaAngle = TiltAngle - OldAvg;
	if (DeltaAngle > 180.0f)
		DeltaAngle -= 360.0f;
	else if (DeltaAngle < -180.0f)
		DeltaAngle += 360.0f;
	OldAvg = TiltAngle;

	if(absf(TiltAngle) < 3.0f)
	{
		WasFlat = true;
		TiltAngle = 0;
	}
	else
	{
		if (WasFlat) TiltAngle *= 0.5f;
		WasFlat = false;
	}

	sensorWario = 0x6C0+DeltaAngle*11;

#endif

	systemUpdateSolarSensor();
}

/****************************************************************************
* systemDrawScreen
****************************************************************************/
static int srcWidth = 0;
static int srcHeight = 0;

void systemDrawScreen()
{
	GX_Render(
		srcWidth,
		srcHeight,
		pix
	);
}

static bool ValidGameId(u32 id)
{
	if (id == 0)
		return false;
	for (unsigned i = 1u; i <= 4u; ++i)
	{
		u8 b = id & 0xFF;
		id >>= 8;
		if (!(b >= 'A' && b <= 'Z') && !(b >= '0' && b <= '9'))
			return false;
	}
	return true;
}

bool IsGameboyGame()
{
	if(cartridgeType == 1 && !gbCgbMode && !gbSgbMode)
		return true;
	return false;
}

bool IsGBAGame()
{
	if(cartridgeType == 2)
		return true;
	return false;
}

static void gbApplyPerImagePreferences()
{
	// Only works for some GB Colour roms
	u8 Colour = gbRom[0x143];
	if (Colour == 0x80 || Colour == 0xC0)
	{
		RomIdCode = gbRom[0x13f] | (gbRom[0x140] << 8) | (gbRom[0x141] << 16)
				| (gbRom[0x142] << 24);
		if (!ValidGameId(RomIdCode))
			RomIdCode = 0;
	}
	else
		RomIdCode = 0;
	// Otherwise we need to make up our own code
	RomTitle[15] = '\0';
	RomTitle[16] = '\0';
	if (gbRom[0x143] < 0x7F && gbRom[0x143] > 0x20)
		strncpy(RomTitle, (const char *) &gbRom[0x134], 16);
	else
		strncpy(RomTitle, (const char *) &gbRom[0x134], 15);

	if (RomIdCode == 0)
	{
		if (strcmp(RomTitle, "ZELDA") == 0)
			RomIdCode = LINKSAWAKENING;
		else if (strcmp(RomTitle, "MORTAL KOMBAT") == 0)
			RomIdCode = MK1;
		else if (strcmp(RomTitle, "MORTALKOMBATI&II") == 0)
			RomIdCode = MK12;
		else if (strcmp(RomTitle, "MORTAL KOMBAT II") == 0)
			RomIdCode = MK2;
		else if (strcmp(RomTitle, "MORTAL KOMBAT 3") == 0)
			RomIdCode = MK3;
		else if (strcmp(RomTitle, "MORTAL KOMBAT 4") == 0)
			RomIdCode = MK4;
		else if (strcmp(RomTitle, "SUPER MARIOLAND") == 0)
			RomIdCode = MARIOLAND1;
		else if (strcmp(RomTitle, "MARIOLAND2") == 0)
			RomIdCode = MARIOLAND2;
		else if (strcmp(RomTitle, "METROID2") == 0)
			RomIdCode = METROID2;
		else if (strcmp(RomTitle, "MARBLE MADNESS") == 0)
			RomIdCode = MARBLEMADNESS;
		else if (strcmp(RomTitle, "TMNT FOOT CLAN") == 0)
			RomIdCode = TMNT1;
		else if (strcmp(RomTitle, "TMNT BACK FROM") == 0 || strcmp(RomTitle, "TMNT 2") == 0)
			RomIdCode = TMNT2;
		else if (strcmp(RomTitle, "TMNT3") == 0)
			RomIdCode = TMNT3;
		else if (strcmp(RomTitle, "CASTLEVANIA ADVE") == 0)
			RomIdCode = CVADVENTURE;
		else if (strcmp(RomTitle, "CASTLEVANIA2 BEL") == 0)
			RomIdCode = CVBELMONT;
		else if (strcmp(RomTitle, "CASTLEVANIA") == 0 || strcmp(RomTitle, "CV3 GER") == 0)
			RomIdCode = CVLEGENDS;
		else if (strcmp(RomTitle, "STAR WARS") == 0)
			RomIdCode = SWEP4;
		else if (strcmp(RomTitle, "EMPIRE STRIKES") == 0)
			RomIdCode = SWEP5;
		else if (strcmp(RomTitle, "SRJ DMG") == 0)
			RomIdCode = SWEP6;
		else if (strcmp(RomTitle, "KID DRACULA") == 0)
			RomIdCode = KIDDRACULA;
	}
	// look for matching palettes if a monochrome gameboy game
	// (or if a Super Gameboy game, but the palette will be ignored later in that case)
	if ((Colour != 0x80) && (Colour != 0xC0))
	{
		if (GCSettings.colorize && strcmp(RomTitle, "MEGAMAN") != 0)
			SetPalette(RomTitle);
		else
			StopColorizing();
	}
}

void ResetTiltAndCursor() {
	TiltScreen = false;
	TiltSideways = false;
	CursorVisible = false;
}

/****************************************************************************
 * ApplyPerImagePreferences
 * Apply game specific settings, originally from vba-over.ini
 ***************************************************************************/

static void ApplyPerImagePreferences()
{
	// look for matching game setting
	int snum = -1;
	RomIdCode = rom[0xac] | (rom[0xad] << 8) | (rom[0xae] << 16) | (rom[0xaf] << 24);
	RomTitle[0] = '\0';

	for(int i=0; i < gameSettingsCount; ++i)
	{
		if(gameSettings[i].gameID[0] == rom[0xac] &&
			gameSettings[i].gameID[1] == rom[0xad] &&
			gameSettings[i].gameID[2] == rom[0xae] &&
			gameSettings[i].gameID[3] == rom[0xaf])
		{
			snum = i;
			break;
		}
	}

	// match found!
	if(snum >= 0)
	{
		if(gameSettings[snum].rtcEnabled >= 0)
			rtcEnable(gameSettings[snum].rtcEnabled);
		if(gameSettings[snum].flashSize > 0)
			flashSetSize(gameSettings[snum].flashSize);
		if(gameSettings[snum].saveType >= 0)
			cpuSaveType = gameSettings[snum].saveType;
		if(gameSettings[snum].mirroringEnabled >= 0)
			mirroringEnable = gameSettings[snum].mirroringEnabled;
	}
	// In most cases this is already handled in GameSettings, but just to make sure:
	switch (rom[0xac])
	{
		case 'F': // Classic NES
			cpuSaveType = 1; // EEPROM
			mirroringEnable = 1;
			break;
		case 'K': // Accelerometers
			cpuSaveType = 4; // EEPROM + sensor
			break;
		case 'R': // WarioWare Twisted style sensors
		case 'V': // Drill Dozer
			rtcEnableWarioRumble(true);
			break;
		case 'U': // Boktai solar sensor and clock
			rtcEnable(true);
			break;
	}
}

void LoadPatch()
{
	int patchsize = 0;
	int patchtype = 0;

	AllocSaveBuffer ();

	char patchpath[2][512];
	memset(patchpath, 0, sizeof(patchpath));
	sprintf(patchpath[0], "%s%s.ips",browser.dir,ROMFilename);
	sprintf(patchpath[1], "%s%s.ups",browser.dir,ROMFilename);

	for(; patchtype<2; patchtype++)
	{
		patchsize = LoadFile(patchpath[patchtype], SILENT);

		if(patchsize)
			break;
	}

	if(patchsize > 0)
	{
		ShowAction("Loading patch...");
		// create memory file
		MFILE * mf = memfopen((char *)savebuffer, patchsize);

		if(cartridgeType == 1)
		{
			if(patchtype == 0)
				patchApplyIPS(mf, &gbRom, &gbRomSize);
			else
				patchApplyUPS(mf, &gbRom, &gbRomSize);
		}
		else
		{
			if(patchtype == 0)
				patchApplyIPS(mf, &rom, &GBAROMSize);
			else
				patchApplyUPS(mf, &rom, &GBAROMSize);
		}

		memfclose(mf); // close memory file
	}

	FreeSaveBuffer ();
}

void SaveSGBBorderIfNoneExists(const void* buffer) {
	char* borderPath = NULL;
	FILE* f = NULL;
	void* rgba8 = NULL;
	IMGCTX pngContext = NULL;
	
	int err;
	
	struct stat s;
	borderPath = AllocAndGetPNGBorderPath(NULL);
	
	char* slash = strrchr(borderPath, '/');
	*slash = '\0'; // cut string off at directory name
	
	err = stat(borderPath, &s);
	if (err == -1) goto cleanup;
	if (!S_ISDIR(s.st_mode)) goto cleanup;
	
	*slash = '/'; // restore slash, bring filename back
	
	err = stat(borderPath, &s);
	if (err != -1 || errno != ENOENT) goto cleanup;
	
	f = fopen(borderPath, "wb");
	if (!f) goto cleanup;
	
	rgba8 = malloc(256*224*3);
	if (!rgba8) goto cleanup;
	pngContext = PNGU_SelectImageFromBuffer(rgba8);
	if (pngContext == NULL) goto cleanup;
	
	PNGU_EncodeFromLinearRGB565(pngContext, 256, 224, buffer, 258);
	fwrite(rgba8, 1, 256*224*3, f);
	
cleanup:
	if (borderPath) free(borderPath);
	if (f) fclose(f);
	if (rgba8) free(rgba8);
	if (pngContext) PNGU_ReleaseImageContext(pngContext);
}

char* AllocAndGetPNGBorderPath(const char* title) {
	const char* method = pathPrefix[GCSettings.LoadMethod];
	const char* folder = GCSettings.BorderFolder;
	
	char tmp[13];
	
	// If no title was passed in, get the rom title
	if (title == NULL) {
		if (cartridgeType == 1) {
			title = gb_get_title(gbRom, NULL);
		} else if (cartridgeType == 2) {
			memcpy(tmp, rom + 0xA0, 12);
			tmp[12] = '\0';
			title = tmp;
		}
	}
	
	size_t length = strlen(method) + strlen(folder) + strlen(title) + 6;
	char* path = (char*)malloc(length);
	if (path) sprintf(path, "%s%s/%s.png", method, folder, title);
	return path;
}

void LoadPNGBorder(const char* fallback)
{
	void* png_tmp_buf = malloc(1024*1024);
	char* borderPath = AllocAndGetPNGBorderPath(NULL);
	PNGUPROP imgProp;
	IMGCTX ctx = NULL;
	char error[1024]; error[1023] = 0;
	int r;
	
	bool borderLoaded = LoadFile((char*)png_tmp_buf, borderPath, 0, 1024*1024, SILENT);
	if (!borderLoaded) {
		// Try default border.png
		free(borderPath);
		borderPath = AllocAndGetPNGBorderPath(fallback);
		borderLoaded = LoadFile((char*)png_tmp_buf, borderPath, 0, 1024*1024, SILENT);
	}
	if (!borderLoaded) goto cleanup;
	
	ctx = PNGU_SelectImageFromBuffer(png_tmp_buf);
	
	if (ctx == NULL) {
		snprintf(error, 1023, "Error reading %s", borderPath);
		ErrorPrompt(error);
		goto cleanup;
	}
	
	r = PNGU_GetImageProperties(ctx, &imgProp);
	if (r != PNGU_OK) {
		snprintf(error, 1023, "PNGU properties error (%d): %s", r, borderPath);
		ErrorPrompt(error);
		goto cleanup;
	}
	
	if (imgProp.imgWidth > 640 || imgProp.imgHeight > 480) {
		snprintf(error, 1023, "Wrong size (should be 640x480 or smaller): %s", borderPath);
		ErrorPrompt(error);
		goto cleanup;
	}
	
	InitialBorder = (u16*)malloc(640*480*2);
	r = PNGU_DecodeTo4x4RGB565 (ctx, imgProp.imgWidth, imgProp.imgHeight, InitialBorder);
	if (r != PNGU_OK) {
		snprintf(error, 1023, "PNGU decoding error (%d): %s", r, borderPath);
		ErrorPrompt(error);
		free(InitialBorder);
		InitialBorder = NULL;
		goto cleanup;
	}
	
	InitialBorderWidth = imgProp.imgWidth;
	InitialBorderHeight = imgProp.imgHeight;
	
cleanup:
	if (png_tmp_buf) free(png_tmp_buf);
	if (borderPath) free(borderPath);
	if (ctx) PNGU_ReleaseImageContext(ctx);
}

extern bool gbUpdateSizes();

bool LoadGBROM()
{
	gbEmulatorType = GCSettings.GBHardware;

	gbRom = (u8 *)malloc(1024*1024*8);
	if (!gbRom) 
	{
		InfoPrompt("Unable to allocate 8 MB of memory");
		return false;
	}
	bios = (u8 *)calloc(1,0x100);

	systemSaveUpdateCounter = SYSTEM_SAVE_NOT_UPDATED;

	if(!inSz)
	{
		char filepath[1024];

		if(!MakeFilePath(filepath, FILE_ROM))
			return false;

		gbRomSize = LoadFile ((char *)gbRom, filepath, 0, (1024*1024*8), NOTSILENT);
	}
	else
	{
		gbRomSize = LoadSzFile(szpath, (unsigned char *)gbRom);
	}
	
	const void* firstRom = gb_first_rom(gbRom, gbRomSize);
	const void* secondRom = gb_next_rom(gbRom, gbRomSize, firstRom);
	if (firstRom != NULL && firstRom != gbRom) {
		char msgbuf[32];
		const void* rom;
		for (rom = firstRom; rom != NULL; rom = gb_next_rom(gbRom, gbRomSize, rom)) {
			sprintf(msgbuf, "Load %s?", gb_get_title(rom, NULL));
			if (secondRom == NULL || YesNoPrompt(msgbuf, true)) {
				gbRomSize = gb_rom_size(rom);
				memmove(gbRom, rom, gbRomSize);
				break;
			}
		}
		if (rom == NULL) {
			InfoPrompt("No more ROMs found in the file.");
			return false;
		}
	}
	
	if (GCSettings.SGBBorder == 2) LoadPNGBorder("default");

	if(gbRomSize <= 0)
		return false;

	return gbUpdateSizes();
}

bool utilIsZipFile(const char* file)
{
  if(strlen(file) > 4)
    {
      char * p = strrchr(file,'.');
      if(p != NULL)
        {
          if(strcasecmp(p, ".zip") == 0)
            return true;
        }
	}
	return false;
}

bool LoadVBAROM()
{
	cartridgeType = 0;
	int loaded = 0;

	// image type (checks file extension)
	if(utilIsGBAImage(browserList[browser.selIndex].filename))
		cartridgeType = 2;
	else if(utilIsGBImage(browserList[browser.selIndex].filename))
		cartridgeType = 1;
	else if(utilIsZipFile(browserList[browser.selIndex].filename))
	{
		// we need to check the file extension of the first file in the archive
		char * zippedFilename = GetFirstZipFilename ();

		if(zippedFilename == NULL) // loading the file failed
		{
			ErrorPrompt("Empty or invalid ZIP file!");
			return false;
		}

		if(utilIsGBAImage(zippedFilename))
		{
			cartridgeType = 2;
		}
		else if(utilIsGBImage(zippedFilename))
		{
			cartridgeType = 1;
		}
		else
		{
			free(zippedFilename);
			return false;
		}
		free(zippedFilename);
	}

	// leave before we do anything
	if(cartridgeType != 1 && cartridgeType != 2)
	{
		// Not zip gba agb gbc cgb sgb gb mb bin elf or dmg!
		ErrorPrompt("Unrecognized file extension!");
		return false;
	}

	srcWidth = 0;
	srcHeight = 0;

	VMClose(); // cleanup GBA memory
	gbCleanUp(); // cleanup GB memory
	
	if (InitialBorder != NULL) {
		free(InitialBorder);
		InitialBorder = NULL;
	}
	SGBBorderLoadedFromGame = false; // don't try to copy sgb border from game to png unless we're in sgb mode

	if(cartridgeType == 2)
	{
		emulator = GBASystem;
		srcWidth = 240;
		srcHeight = 160;
		loaded = VMCPULoadROM();
		soundSetSampleRate(22050); //44100 / 2
		cpuSaveType = 0;
		if (loaded == 2) {
			loaded = 0;
			cartridgeType = 1;
		} else if (loaded == 1 && GCSettings.SGBBorder == 2) {
			LoadPNGBorder("defaultgba");
		}
	}
	
	if (cartridgeType == 1)
	{
		emulator = GBSystem;
		gbBorderOn = (GCSettings.SGBBorder == 1);

		if(gbBorderOn)
		{
			srcWidth = 256;
			srcHeight = 224;
			gbBorderLineSkip = 256;
			gbBorderColumnSkip = 48;
			gbBorderRowSkip = 40;
			SGBBorderLoadedFromGame = false; // try to load the border during rendering
		}
		else
		{
			srcWidth = 160;
			srcHeight = 144;
			gbBorderLineSkip = 160;
			gbBorderColumnSkip = 0;
			gbBorderRowSkip = 0;
		}

		loaded = LoadGBROM();
		soundSetSampleRate(44100);
	}

	if(!loaded)
	{
		ErrorPrompt("Error loading game!");
		return false;
	}
	else
	{
		// Setup GX
		if (InitialBorder) {
			GX_Render_Init(InitialBorderWidth, InitialBorderHeight);
		} else {
			GX_Render_Init(srcWidth, srcHeight);
		}

		if (cartridgeType == 1)
		{
			gbGetHardwareType();

			// used for the handling of the gb Boot Rom
			//if (gbHardware & 5)
			//gbCPUInit(gbBiosFileName, useBios);

			LoadPatch();

			// Apply preferences specific to this game
			gbApplyPerImagePreferences();

			gbSoundReset();
			gbSoundSetDeclicking(true);
			gbReset();
		}
		else
		{
			// Set defaults
			cpuSaveType = 0; // automatic
			flashSetSize(0x10000); // 64K saves
			rtcEnable(false);
			agbPrintEnable(false);
			mirroringEnable = false;

			// Apply preferences specific to this game
			ApplyPerImagePreferences();
			doMirroring(mirroringEnable);

			soundReset();
			CPUInit(NULL, false);
			LoadPatch();
			CPUReset();
		}

		SetAudioRate(cartridgeType);
		soundInit();

		emulating = 1;

		// reset frameskip variables
		lastTime = systemFrameSkip = 0;

		// Start system clock
		start = gettime();

		return true;
	}
}

/****************************************************************************
* Palette
****************************************************************************/

void InitialisePalette()
{
	int i;
	// Build GBPalette
	for( i = 0; i < 24; )
	{

		if (GCSettings.BasicPalette == 0) //Greenish color
		{
			systemGbPalette[i++] = (0x1c) | (0x1e << 5) | (0x1c << 10);
			systemGbPalette[i++] = (0x10) | (0x17 << 5) | (0x0b << 10);
			systemGbPalette[i++] = (0x27) | (0x0c << 5) | (0x0a << 10);
		}
		else	// Monochrome color
		{
			systemGbPalette[i++] = (0x1f) | (0x1f << 5) | (0x1f << 10);
			systemGbPalette[i++] = (0x15) | (0x15 << 5) | (0x15 << 10);
			systemGbPalette[i++] = (0x0c) | (0x0c << 5) | (0x0c << 10);
		}
		systemGbPalette[i++] = 0;
	}
	// Set palette etc - Fixed to RGB565
	systemColorDepth = 16;
	systemRedShift = 11;
	systemGreenShift = 6;
	systemBlueShift = 0;
	for(i = 0; i < 0x10000; i++)
	{
		systemColorMap16[i] =
			((i & 0x1f) << systemRedShift) |
			(((i & 0x3e0) >> 5) << systemGreenShift) |
			(((i & 0x7c00) >> 10) << systemBlueShift);
	}
}