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Attempt to calculate actual refresh rate (i.e. a CPU-GPU synced Mhz), no real success. Anybody have any ideas?

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Is there no indication from the game when the screen refresh should occur? No, not what I could find, we currently calculate the refresh rate and m_VBeamPos from the CPU ticks progress. That works perfectly if the CPU and GPU is perfectly synced as in the single core and no-idle skipping mode. So I guess it's possible that the game doesn't indicate when the screen should be refreshed, but rather that the hardware calculate that from the CPU ticks progress. That leaves us with a problem in the dual core and idle skipping modes to calculate a CPU-GPU synced CPU ticks progress.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@3447 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
John Peterson
2009-06-15 04:30:02 +00:00
parent 3295ec38eb
commit 5c04af50a4
12 changed files with 242 additions and 78 deletions
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54
Source/Core/VideoCommon/Src/Fifo.cpp
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@ -76,26 +76,6 @@ u8* FAKE_GetFifoEndPtr()
return &videoBuffer[size];
}
// The loop in EnterLoop sends data through this function.
// TODO: Possibly inline it? This one is exported so it will likely not be inlined at all.
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();
}
// Executed from another thread, no the graphics thread!
// Basically, all it does is set a flag so that the loop will eventually exit, then
// waits for the event to be set, which happens when the loop does exit.
@ -124,7 +104,35 @@ void Fifo_ExitLoopNonBlocking() {
fifoStateRun = false;
}
//
//////////////////////////////////////////////////////////////////////////////////////////
// Description: Fifo_EnterLoop() sends data through this function.
// TODO: Possibly inline it? This one is exported so it will likely not be inlined at all.
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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();
}
// Copy new video instructions to videoBuffer for future use in rendering the new picture
memcpy(videoBuffer + size, _uData, len);
size += len;
OpcodeDecoder_Run();
}
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
// Description: Main FIFO update loop
// Purpose: Keep the Core HW updated about the CPU-GPU distance
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
{
fifoStateRun = true;
@ -160,7 +168,7 @@ void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
video_initialize.pPeekMessages();
peek_counter = 0;
}
// read the data and send it to the VideoPlugin
// Create pointer to video data and send it to the VideoPlugin
u32 readPtr = _fifo.CPReadPointer;
u8 *uData = video_initialize.pGetMemoryPointer(readPtr);
@ -204,6 +212,7 @@ void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
readPtr += distToSend;
#endif
}
// Execute new instructions found in uData
Video_SendFifoData(uData, distToSend);
Common::SyncInterlockedExchange((LONG*)&_fifo.CPReadPointer, readPtr);
Common::SyncInterlockedExchangeAdd((LONG*)&_fifo.CPReadWriteDistance, -distToSend);
@ -217,3 +226,4 @@ void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
fifo_exit_event.SetTimer();
#endif
}
//////////////////////////////////////////////////////////////////////////////////////////