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modify fingerprint validity checking method

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In Zelda OOT the CPU applies a filter on the framebuffer texture. If we
write a small amount of data at the beginning the CPU won't change our
specific values
This commit is contained in:
purplemarshmallow 2015-08-02 08:16:12 +02:00 committed by Sergey Lipskiy
parent e0face5f86
commit 0735bd0372
1 changed files with 15 additions and 10 deletions
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25
src/FrameBuffer.cpp
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@ -264,14 +264,18 @@ void FrameBuffer::copyRdram()
// This is necessary for auxilary buffers: game can restore content of RDRAM when buffer is not needed anymore
// Thus content of RDRAM on moment of buffer creation will be the same as when buffer becomes obsolete.
// Validity check will see that the RDRAM is the same and thus the buffer is valid, which is false.
// It can be enough to write data just little more than treshold level, but more safe to write twice as much in case that some values in buffer match our fingerprint.
//if (dataSize > ) {
//todo: make sure buffer is bigger than the fingerprint
u32 start = m_startAddress >> 2;
u32 * pData = (u32*)RDRAM;
for (u32 i = 0; i < 4; ++i)
const u32 twoPercent = dataSize / 200;
u32 start = m_startAddress >> 2;
u32 * pData = (u32*)RDRAM;
for (u32 i = 0; i < twoPercent; ++i)
{
if (i < 4)
pData[start++] = fingerprint[i];
//}
else
pData[start++] = 0;
}
m_cleared = false;
return;
}
}
@ -296,8 +300,8 @@ bool FrameBuffer::isValid() const
++wrongPixels;
}
return wrongPixels < (m_endAddress - m_startAddress) / 400; // treshold level 1% of dwords
} else if (!m_RdramCopy.empty()) {
if (m_width != VI.width && config.frameBufferEmulation.validityCheckMethod == Config::vcFingerprint) {
}
else if (m_width != VI.width) {
// Auxiliary frame buffer
//check if our fingerprint is still there
const u32 stride = m_width << m_size >> 1;
@ -308,7 +312,8 @@ bool FrameBuffer::isValid() const
if ((pData[start++] & 0xFFFEFFFE) != (fingerprint[i] & 0xFFFEFFFE))
return false;
return true;
}
}
else if (!m_RdramCopy.empty()) {
const u32 * const pCopy = (const u32*)m_RdramCopy.data();
const u32 size = m_RdramCopy.size();
const u32 size_dwords = size >> 2;