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Fixed GPFifo out of bounds by 32 bytes

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Fixed incorrect FIFO out of bounds check
plus a bit optimization of CheckPipe()

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5692 8ced0084-cf51-0410-be5f-012b33b47a6e
This commit is contained in:
ayuanx
2010-06-14 16:32:40 +00:00
parent fc12291806
commit 857f1f4d38
3 changed files with 38 additions and 30 deletions
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12
Source/Core/VideoCommon/Src/Fifo.cpp
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@ -118,12 +118,12 @@ void Fifo_SendFifoData(u8* _uData, u32 len)
if (size + len >= FIFO_SIZE)
{
int pos = (int)(g_pVideoData - videoBuffer);
if (size - pos > pos)
size -= pos;
if (size + len > FIFO_SIZE)
{
PanicAlert("FIFO out of bounds (sz = %i, at %08x)", size, pos);
}
memmove(&videoBuffer[0], &videoBuffer[pos], size - pos);
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
@ -180,7 +180,7 @@ void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
}
distToSend = 32;
if ( readPtr >= _fifo.CPEnd)
if (readPtr + 32 >= _fifo.CPEnd)
readPtr = _fifo.CPBase;
else
readPtr += 32;
@ -192,9 +192,9 @@ void Fifo_EnterLoop(const SVideoInitialize &video_initialize)
// send 1024B chunk max length to have better control over PeekMessages' period
distToSend = distToSend > 1024 ? 1024 : distToSend;
// add 32 bytes because the cp end points to the start of the last 32 byte chunk
if ((distToSend + readPtr) >= (_fifo.CPEnd + 32)) // TODO: better?
if (readPtr + distToSend >= _fifo.CPEnd)
{
distToSend =(_fifo.CPEnd + 32) - readPtr;
distToSend = _fifo.CPEnd - readPtr;
readPtr = _fifo.CPBase;
}
else