bool FifoCommandRunnable()
{
u32 buffer_size = (u32)(GetVideoBufferEndPtr() - g_pVideoData);
if (buffer_size == 0)
return false; // can't peek
u8 cmd_byte = DataPeek8(0);
u32 command_size = 0;
switch (cmd_byte)
{
case GX_NOP: // Hm, this means that we scan over nop streams pretty slowly...
case GX_CMD_INVL_VC: // Invalidate Vertex Cache - no parameters
case GX_CMD_UNKNOWN_METRICS: // zelda 4 swords calls it and checks the metrics registers after that
command_size = 1;
break;
case GX_LOAD_BP_REG:
command_size = 5;
break;
case GX_LOAD_CP_REG:
command_size = 6;
break;
case GX_LOAD_INDX_A:
case GX_LOAD_INDX_B:
case GX_LOAD_INDX_C:
case GX_LOAD_INDX_D:
command_size = 5;
break;
case GX_CMD_CALL_DL:
command_size = 9;
break;
case GX_LOAD_XF_REG:
{
// check if we can read the header
if (buffer_size >= 5)
{
command_size = 1 + 4;
u32 Cmd2 = DataPeek32(1);
int transfer_size = ((Cmd2 >> 16) & 15) + 1;
command_size += transfer_size * 4;
}
else
{
return false;
}
}
// Description: Main FIFO update loop
// Purpose: Keep the Core HW updated about the CPU-GPU distance
void RunGpuLoop()
{
std::lock_guard<std::mutex> lk(m_csHWVidOccupied);
GpuRunningState = true;
SCPFifoStruct &fifo = CommandProcessor::fifo;
u32 cyclesExecuted = 0;
while (GpuRunningState)
{
g_video_backend->PeekMessages();
VideoFifo_CheckAsyncRequest();
CommandProcessor::SetCpStatus();
Common::AtomicStore(CommandProcessor::VITicks, CommandProcessor::m_cpClockOrigin);
// check if we are able to run this buffer
while (GpuRunningState && !CommandProcessor::interruptWaiting && fifo.bFF_GPReadEnable && fifo.CPReadWriteDistance && !AtBreakpoint())
{
fifo.isGpuReadingData = true;
CommandProcessor::isPossibleWaitingSetDrawDone = fifo.bFF_GPLinkEnable ? true : false;
if (!Core::g_CoreStartupParameter.bSyncGPU || Common::AtomicLoad(CommandProcessor::VITicks) > CommandProcessor::m_cpClockOrigin)
{
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 instability in the game. Please report it.", fifo.CPReadWriteDistance - 32);
ReadDataFromFifo(uData, 32);
cyclesExecuted = OpcodeDecoder_Run(g_bSkipCurrentFrame);
if (Core::g_CoreStartupParameter.bSyncGPU && Common::AtomicLoad(CommandProcessor::VITicks) > cyclesExecuted)
Common::AtomicAdd(CommandProcessor::VITicks, -(s32)cyclesExecuted);
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)
{
// NOTE(jsd): Calling SwitchToThread() on Windows 7 x64 is a hot spot, according to profiler.
// See https://docs.google.com/spreadsheet/ccc?key=0Ah4nh0yGtjrgdFpDeF9pS3V6RUotRVE3S3J4TGM1NlE#gid=0
// for benchmark details.
#if 0
Common::YieldCPU();
#endif
}
else
{
// While the emu is paused, we still handle async requests then sleep.
while (!EmuRunningState)
{
g_video_backend->PeekMessages();
m_csHWVidOccupied.unlock();
Common::SleepCurrentThread(1);
m_csHWVidOccupied.lock();
}
}
}
}
u32 FifoCommandRunnable(u32 &command_size)
{
u32 cycleTime = 0;
u32 buffer_size = (u32)(GetVideoBufferEndPtr() - g_pVideoData);
if (buffer_size == 0)
return 0; // can't peek
u8 cmd_byte = DataPeek8(0);
switch (cmd_byte)
{
case GX_NOP: // Hm, this means that we scan over nop streams pretty slowly...
command_size = 1;
cycleTime = 6;
break;
case GX_CMD_INVL_VC: // Invalidate Vertex Cache - no parameters
command_size = 1;
cycleTime = 6;
break;
case GX_CMD_UNKNOWN_METRICS: // zelda 4 swords calls it and checks the metrics registers after that
command_size = 1;
cycleTime = 6;
break;
case GX_LOAD_BP_REG:
command_size = 5;
cycleTime = 12;
break;
case GX_LOAD_CP_REG:
command_size = 6;
cycleTime = 12;
break;
case GX_LOAD_INDX_A:
case GX_LOAD_INDX_B:
case GX_LOAD_INDX_C:
case GX_LOAD_INDX_D:
command_size = 5;
cycleTime = 6; // TODO
break;
case GX_CMD_CALL_DL:
{
// FIXME: Calculate the cycle time of the display list.
//u32 address = DataPeek32(1);
//u32 size = DataPeek32(5);
//u8* old_pVideoData = g_pVideoData;
//u8* startAddress = Memory::GetPointer(address);
//// Avoid the crash if Memory::GetPointer failed ..
//if (startAddress != 0)
//{
// g_pVideoData = startAddress;
// u8 *end = g_pVideoData + size;
// u32 step = 0;
// while (g_pVideoData < end)
// {
// cycleTime += FifoCommandRunnable(step);
// g_pVideoData += step;
// }
//}
//else
//{
// cycleTime = 45;
//}
//// reset to the old pointer
//g_pVideoData = old_pVideoData;
command_size = 9;
cycleTime = 45; // This is unverified
}
break;
case GX_LOAD_XF_REG:
{
// check if we can read the header
if (buffer_size >= 5)
{
command_size = 1 + 4;
u32 Cmd2 = DataPeek32(1);
int transfer_size = ((Cmd2 >> 16) & 15) + 1;
command_size += transfer_size * 4;
cycleTime = 18 + 6 * transfer_size;
}
else
{
return 0;
}
}
