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);
int pos = (int)(g_pVideoData-videoBuffer); // get offset
p.Do(pos); // read or write offset (depends on the mode afaik)
g_pVideoData = &videoBuffer[pos]; // overwrite g_pVideoData -> expected no change when load ss and change when save ss
}
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, u32 len)
{
if (size + len >= FIFO_SIZE)
{
int pos = (int)(g_pVideoData-videoBuffer);
if (size-pos > pos)
{
PanicAlert("FIFO out of bounds (sz = %i, at %08x)", size, pos);
}
memmove(&videoBuffer[0], &videoBuffer[pos], size - pos );
size -= pos;
g_pVideoData = FAKE_GetFifoStartPtr();
}
memcpy(videoBuffer + size, _uData, len);
size += len;
OpcodeDecoder_Run();
}
void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
{
SCPFifoStruct &_fifo = *video_initialize.pCPFifo;
u32 distToSend;
#ifdef _WIN32
// TODO(ector): Don't peek so often!
while (video_initialize.pPeekMessages())
#else
while (fifoStateRun)
#endif
{
if (_fifo.CPReadWriteDistance < _fifo.CPLoWatermark)
Common::SleepCurrentThread(1);
//etc...
// check if we are able to run this buffer
if ((_fifo.bFF_GPReadEnable) && _fifo.CPReadWriteDistance && !(_fifo.bFF_BPEnable && _fifo.bFF_Breakpoint))
{
#ifdef _WIN32
InterlockedExchange((LONG*)&_fifo.CPReadIdle, 0);
#else
Common::InterlockedExchange((int*)&_fifo.CPReadIdle, 0);
#endif
//video_initialize.pLog("RUN...........................",FALSE);
int peek_counter = 0;
while (_fifo.bFF_GPReadEnable && (_fifo.CPReadWriteDistance > 0))
{
peek_counter++;
if (peek_counter == 50) {
video_initialize.pPeekMessages();
peek_counter = 0;
}
// read the data and send it to the VideoPlugin
u32 readPtr = _fifo.CPReadPointer;
u8 *uData = video_initialize.pGetMemoryPointer(readPtr);
// if we are on BP mode we must send 32B chunks to Video plugin for BP checking
// TODO (mb2): test & check if MP1/MP2 realy need this now.
if (_fifo.bFF_BPEnable)
{
if (readPtr == _fifo.CPBreakpoint)
{
video_initialize.pLog("!!! BP irq raised",FALSE);
#ifdef _WIN32
InterlockedExchange((LONG*)&_fifo.bFF_Breakpoint, 1);
#else
Common::InterlockedExchange((int*)&_fifo.bFF_Breakpoint, 1);
#endif
video_initialize.pUpdateInterrupts();
break;
}
distToSend = 32;
readPtr += 32;
if ( readPtr >= _fifo.CPEnd)
readPtr = _fifo.CPBase;
}
else
{
#if 0 // ugly random GP slowdown for testing DC robustness... TODO: remove when completly sure DC is ok
int r=rand();if ((r&0xF)==r) Common::SleepCurrentThread(r);
distToSend = 32;
readPtr += 32;
if ( readPtr >= _fifo.CPEnd)
readPtr = _fifo.CPBase;
#else
// sending the whole CPReadWriteDistance
distToSend = _fifo.CPReadWriteDistance;
if ( (distToSend+readPtr) >= _fifo.CPEnd) // TODO: better?
{
distToSend =_fifo.CPEnd - readPtr;
readPtr = _fifo.CPBase;
}
else
readPtr += distToSend;
#endif
}
Video_SendFifoData(uData, distToSend);
#ifdef _WIN32
InterlockedExchange((LONG*)&_fifo.CPReadPointer, readPtr);
InterlockedExchangeAdd((LONG*)&_fifo.CPReadWriteDistance, -distToSend);
#else
Common::InterlockedExchange((int*)&_fifo.CPReadPointer, readPtr);
Common::InterlockedExchangeAdd((int*)&_fifo.CPReadWriteDistance, -distToSend);
#endif
}
//video_initialize.pLog("..........................IDLE",FALSE);
#ifdef _WIN32
InterlockedExchange((LONG*)&_fifo.CPReadIdle, 1);
#else
Common::InterlockedExchange((int*)&_fifo.CPReadIdle, 1);
#endif
}
}
}