// Copyright (C) 2003-2009 Dolphin Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official Git repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/


// http://developer.nvidia.com/object/General_FAQ.html#t6 !!!!!



#include "Common.h"
#include "ChunkFile.h"
#include "CoreTiming.h"
#include "ConfigManager.h"
#include "HW/ProcessorInterface.h"

#include "SWPixelEngine.h"
#include "SWCommandProcessor.h"


namespace SWPixelEngine
{

enum
{
	INT_CAUSE_PE_TOKEN    =  0x200, // GP Token
	INT_CAUSE_PE_FINISH   =  0x400, // GP Finished
};

// STATE_TO_SAVE
PEReg pereg;

static bool g_bSignalTokenInterrupt;
static bool g_bSignalFinishInterrupt;

static int et_SetTokenOnMainThread;
static int et_SetFinishOnMainThread;

void DoState(PointerWrap &p)
{
	p.DoPOD(pereg);
	p.Do(g_bSignalTokenInterrupt);
	p.Do(g_bSignalFinishInterrupt);
	p.Do(et_SetTokenOnMainThread);
	p.Do(et_SetFinishOnMainThread);
}

void UpdateInterrupts();

void SetToken_OnMainThread(u64 userdata, int cyclesLate);
void SetFinish_OnMainThread(u64 userdata, int cyclesLate);

void Init()
{
	memset(&pereg, 0, sizeof(pereg));

	et_SetTokenOnMainThread = false;
	g_bSignalFinishInterrupt = false;

	et_SetTokenOnMainThread = CoreTiming::RegisterEvent("SetToken", SetToken_OnMainThread);
	et_SetFinishOnMainThread = CoreTiming::RegisterEvent("SetFinish", SetFinish_OnMainThread);
}

void Read16(u16& _uReturnValue, const u32 _iAddress)
{
	DEBUG_LOG(PIXELENGINE, "(r16): 0x%08x", _iAddress);

	u16 address = _iAddress & 0xFFF;

	if (address <= 0x2e)
		_uReturnValue = ((u16*)&pereg)[address >> 1];
}

void Write32(const u32 _iValue, const u32 _iAddress)
{
	WARN_LOG(PIXELENGINE, "(w32): 0x%08x @ 0x%08x",_iValue,_iAddress);
}

void Write16(const u16 _iValue, const u32 _iAddress)
{
	u16 address = _iAddress & 0xFFF;

	switch (address)
	{
	case PE_CTRL_REGISTER:	
		{
			UPECtrlReg tmpCtrl(_iValue);

			if (tmpCtrl.PEToken)	g_bSignalTokenInterrupt = false;
			if (tmpCtrl.PEFinish)	g_bSignalFinishInterrupt = false;

			pereg.ctrl.PETokenEnable = tmpCtrl.PETokenEnable;
			pereg.ctrl.PEFinishEnable = tmpCtrl.PEFinishEnable;
			pereg.ctrl.PEToken = 0;		// this flag is write only
			pereg.ctrl.PEFinish = 0;	// this flag is write only

			DEBUG_LOG(PIXELENGINE, "(w16): PE_CTRL_REGISTER: 0x%04x", _iValue);
			UpdateInterrupts();
		}
		break;
	default:
		if (address <= 0x2e)
			((u16*)&pereg)[address >> 1] = _iValue;
		break;
	}
}

bool AllowIdleSkipping()
{
	return !SConfig::GetInstance().m_LocalCoreStartupParameter.bCPUThread || (!pereg.ctrl.PETokenEnable && !pereg.ctrl.PEFinishEnable);
}

void UpdateInterrupts()
{
	// check if there is a token-interrupt
	if (g_bSignalTokenInterrupt	& pereg.ctrl.PETokenEnable)
		ProcessorInterface::SetInterrupt(INT_CAUSE_PE_TOKEN, true);
	else
		ProcessorInterface::SetInterrupt(INT_CAUSE_PE_TOKEN, false);

	// check if there is a finish-interrupt
	if (g_bSignalFinishInterrupt & pereg.ctrl.PEFinishEnable)
		ProcessorInterface::SetInterrupt(INT_CAUSE_PE_FINISH, true);
	else
		ProcessorInterface::SetInterrupt(INT_CAUSE_PE_FINISH, false);
}


// Called only if BPMEM_PE_TOKEN_INT_ID is ack by GP
void SetToken_OnMainThread(u64 userdata, int cyclesLate)
{
	g_bSignalTokenInterrupt = true;
	INFO_LOG(PIXELENGINE, "VIDEO Backend raises INT_CAUSE_PE_TOKEN (btw, token: %04x)", pereg.token);
	UpdateInterrupts();
}

void SetFinish_OnMainThread(u64 userdata, int cyclesLate)
{
	g_bSignalFinishInterrupt = true;	
	UpdateInterrupts();
}

// SetToken
// THIS IS EXECUTED FROM VIDEO THREAD
void SetToken(const u16 _token, const int _bSetTokenAcknowledge)
{
	pereg.token = _token;
	if (_bSetTokenAcknowledge) // set token INT
	{
		CoreTiming::ScheduleEvent_Threadsafe(0, et_SetTokenOnMainThread,
			_token | (_bSetTokenAcknowledge << 16));
	}
}

// SetFinish
// THIS IS EXECUTED FROM VIDEO THREAD
void SetFinish()
{
	CoreTiming::ScheduleEvent_Threadsafe(0, et_SetFinishOnMainThread, 0);
	INFO_LOG(PIXELENGINE, "VIDEO Set Finish");
}

} // end of namespace SWPixelEngine