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// Copyright (C) 2003 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 "VideoConfig.h"
#include "Setup.h"
#include "MemoryUtil.h"
#include "Thread.h"
#include "Atomic.h"
#include "OpcodeDecoding.h"
#include "CommandProcessor.h"
#include "ChunkFile.h"
#include "Fifo.h"
#include "HW/Memmap.h"
volatile bool g_bSkipCurrentFrame = false;
extern u8* g_pVideoData;
namespace
{
static volatile bool GpuRunningState = false;
static volatile bool EmuRunningState = false;
static u8 *videoBuffer;
// STATE_TO_SAVE
static int size = 0;
} // namespace
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);
size = 0;
GpuRunningState = false;
}
void Fifo_Shutdown()
{
if (GpuRunningState) PanicAlert("Fifo shutting down while active");
FreeMemoryPages(videoBuffer, FIFO_SIZE);
}
u8* GetVideoBufferStartPtr()
{
return videoBuffer;
}
u8* GetVideoBufferEndPtr()
{
return &videoBuffer[size];
}
void Fifo_SetRendering(bool enabled)
{
g_bSkipCurrentFrame = !enabled;
}
// May be executed from any thread, even the graphics thread.
// Created to allow for self shutdown.
void ExitGpuLoop()
{
// This should break the wait loop in CPU thread
CommandProcessor::fifo.bFF_GPReadEnable = false;
SCPFifoStruct &fifo = CommandProcessor::fifo;
while(fifo.isGpuReadingData) Common::YieldCPU();
// Terminate GPU thread loop
GpuRunningState = false;
EmuRunningState = true;
}
void EmulatorState(bool running)
{
EmuRunningState = running;
}
// Description: RunGpuLoop() sends data through this function.
void ReadDataFromFifo(u8* _uData, u32 len)
{
if (size + len >= FIFO_SIZE)
{
int pos = (int)(g_pVideoData - videoBuffer);
size -= pos;
if (size + len > FIFO_SIZE)
{
PanicAlert("FIFO out of bounds (sz = %i, at %08x)", size, pos);
}
memmove(&videoBuffer[0], &videoBuffer[pos], size);
g_pVideoData = videoBuffer;
}
// Copy new video instructions to videoBuffer for future use in rendering the new picture
memcpy(videoBuffer + size, _uData, len);
size += len;
}
void ResetVideoBuffer()
{
g_pVideoData = videoBuffer;
size = 0;
}
// Description: Main FIFO update loop
// Purpose: Keep the Core HW updated about the CPU-GPU distance
void RunGpuLoop()
{
GpuRunningState = true;
SCPFifoStruct &fifo = CommandProcessor::fifo;
while (GpuRunningState)
{
g_video_backend->PeekMessages();
VideoFifo_CheckAsyncRequest();
CommandProcessor::SetCpStatus();
// check if we are able to run this buffer
while (!CommandProcessor::interruptWaiting && fifo.bFF_GPReadEnable &&
fifo.CPReadWriteDistance && (!AtBreakpoint() || CommandProcessor::OnOverflow))
{
if (!GpuRunningState) break;
fifo.isGpuReadingData = true;
CommandProcessor::isPossibleWaitingSetDrawDone = fifo.bFF_GPLinkEnable ? true : false;
u32 readPtr = fifo.CPReadPointer;
u8 *uData = Memory::GetPointer(readPtr);
if (readPtr == fifo.CPEnd) readPtr = fifo.CPBase;
else readPtr += 32;
_assert_msg_(COMMANDPROCESSOR, (s32)fifo.CPReadWriteDistance - 32 >= 0 ,
"Negative fifo.CPReadWriteDistance = %i in FIFO Loop !\nThat can produce inestabilty in the game. Please report it.", fifo.CPReadWriteDistance - 32);
ReadDataFromFifo(uData, 32);
OpcodeDecoder_Run(g_bSkipCurrentFrame);
Common::AtomicStore(fifo.CPReadPointer, readPtr);
Common::AtomicAdd(fifo.CPReadWriteDistance, -32);
if((GetVideoBufferEndPtr() - g_pVideoData) == 0)
Common::AtomicStore(fifo.SafeCPReadPointer, fifo.CPReadPointer);
CommandProcessor::SetCpStatus();
// This call is pretty important in DualCore mode and must be called in the FIFO Loop.
// If we don't, s_swapRequested or s_efbAccessRequested won't be set to false
// leading the CPU thread to wait in Video_BeginField or Video_AccessEFB thus slowing things down.
VideoFifo_CheckAsyncRequest();
CommandProcessor::isPossibleWaitingSetDrawDone = false;
}
fifo.isGpuReadingData = false;
if (EmuRunningState)
Common::YieldCPU();
else
{
// While the emu is paused, we still handle async request such as Savestates then sleep.
while (!EmuRunningState)
{
g_video_backend->PeekMessages();
VideoFifo_CheckStateRequest();
Common::SleepCurrentThread(1);
}
}
}
}
bool AtBreakpoint()
{
SCPFifoStruct &fifo = CommandProcessor::fifo;
return fifo.bFF_BPEnable && (fifo.CPReadPointer == fifo.CPBreakpoint);
}
void RunGpu()
{
SCPFifoStruct &fifo = CommandProcessor::fifo;
while (fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint() )
{
u8 *uData = Memory::GetPointer(fifo.CPReadPointer);
SaveSSEState();
LoadDefaultSSEState();
ReadDataFromFifo(uData, 32);
OpcodeDecoder_Run(g_bSkipCurrentFrame);
LoadSSEState();
//DEBUG_LOG(COMMANDPROCESSOR, "Fifo wraps to base");
if (fifo.CPReadPointer == fifo.CPEnd) fifo.CPReadPointer = fifo.CPBase;
else fifo.CPReadPointer += 32;
fifo.CPReadWriteDistance -= 32;
}
CommandProcessor::SetCpStatus();
}
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