dolphin/Source/Core/VideoCommon/Src/Fifo.cpp

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// Copyright (C) 2003-2008 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 SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include <string.h>
#include "MemoryUtil.h"
#include "Thread.h"
#include "OpcodeDecoding.h"
#include "Fifo.h"
extern u8* g_pVideoData;
bool fifoStateRun = true;
// STATE_TO_SAVE
static u8 *videoBuffer;
static int size = 0;
void Fifo_DoState(PointerWrap &p)
{
p.DoArray(videoBuffer, FIFO_SIZE);
p.Do(size);
}
void Fifo_Init()
{
videoBuffer = (u8*)AllocateMemoryPages(FIFO_SIZE);
fifoStateRun = true;
}
void Fifo_Shutdown()
{
FreeMemoryPages(videoBuffer, FIFO_SIZE);
fifoStateRun = false;
}
void Fifo_Stop()
{
fifoStateRun = false;
}
u8* FAKE_GetFifoStartPtr()
{
return videoBuffer;
}
u8* FAKE_GetFifoEndPtr()
{
return &videoBuffer[size];
}
void Video_SendFifoData(u8* _uData)
{
// TODO (mb2): unrolled loop faster than memcpy here?
memcpy(videoBuffer + size, _uData, 32);
size += 32;
if (size + 32 >= FIFO_SIZE)
{
int pos = (int)(g_pVideoData-videoBuffer);
//if (size-pos > pos)
//{
// PanicAlert("FIFO out of bounds (sz = %i, at %08x)", FAKE_GetFifoSize(), readptr);
//}
memmove(&videoBuffer[0], &videoBuffer[pos], size - pos );
size -= pos;
g_pVideoData = FAKE_GetFifoStartPtr();
}
OpcodeDecoder_Run();
}
//TODO - turn inside out, have the "reader" ask for bytes instead
// See Core.cpp for threading idea
void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
{
SCPFifoStruct &_fifo = *video_initialize.pCPFifo;
#if defined(THREAD_VIDEO_WAKEUP_ONIDLE) && defined(_WIN32)
HANDLE hEventOnIdle= OpenEventA(EVENT_ALL_ACCESS,FALSE,(LPCSTR)"EventOnIdle");
if (hEventOnIdle==NULL) PanicAlert("Fifo_EnterLoop() -> EventOnIdle NULL");
#endif
#ifdef _WIN32
// TODO(ector): Don't peek so often!
while (video_initialize.pPeekMessages())
#else
while (fifoStateRun)
#endif
{
#if defined(THREAD_VIDEO_WAKEUP_ONIDLE) && defined(_WIN32)
if (MsgWaitForMultipleObjects(1, &hEventOnIdle, FALSE, 1L, QS_ALLEVENTS) == WAIT_ABANDONED)
break;
#endif
if (_fifo.CPReadWriteDistance < 1) //fifo.CPLoWatermark)
#if defined(THREAD_VIDEO_WAKEUP_ONIDLE) && defined(_WIN32)
continue;
#else
Common::SleepCurrentThread(1);
#endif
//etc...
// check if we are able to run this buffer
if ((_fifo.bFF_GPReadEnable) && !(_fifo.bFF_BPEnable && _fifo.bFF_Breakpoint))
{
#if defined(THREAD_VIDEO_WAKEUP_ONIDLE) && defined(_WIN32)
while(_fifo.CPReadWriteDistance > 0)
#else
int count = 200;
while(_fifo.CPReadWriteDistance > 0 && count)
#endif
{
// check if we are on a breakpoint
if (_fifo.bFF_BPEnable)
{
if (_fifo.CPReadPointer == _fifo.CPBreakpoint)
{
_fifo.bFF_Breakpoint = 1;
video_initialize.pUpdateInterrupts();
break;
}
}
// read the data and send it to the VideoPlugin
u8 *uData = video_initialize.pGetMemoryPointer(_fifo.CPReadPointer);
#ifdef _WIN32
EnterCriticalSection(&_fifo.sync);
#else
_fifo.sync->Enter();
#endif
_fifo.CPReadPointer += 32;
Video_SendFifoData(uData);
#ifdef _WIN32
InterlockedExchangeAdd((LONG*)&_fifo.CPReadWriteDistance, -32);
LeaveCriticalSection(&_fifo.sync);
#else
Common::InterlockedExchangeAdd((int*)&_fifo.CPReadWriteDistance, -32);
_fifo.sync->Leave();
#endif
// increase the ReadPtr
if (_fifo.CPReadPointer >= _fifo.CPEnd)
{
_fifo.CPReadPointer = _fifo.CPBase;
//LOG(COMMANDPROCESSOR, "BUFFER LOOP");
}
#ifndef THREAD_VIDEO_WAKEUP_ONIDLE
count--;
#endif
}
}
}
#if defined(THREAD_VIDEO_WAKEUP_ONIDLE) && defined(_WIN32)
CloseHandle(hEventOnIdle);
#endif
}