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Replace Adler32 by more faster textureCRC from Glide64.

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textureCRC is good enough to calculate checksum of frame buffer.
This commit is contained in:
Sergey Lipskiy 2015-04-09 20:33:40 +06:00
parent 7914c415ad
commit 6fa0204709
4 changed files with 22 additions and 23 deletions
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34
CRC.cpp
View File

@ -59,28 +59,24 @@ u32 CRC_CalculatePalette(u32 crc, const void * buffer, u32 count )
return crc ^ orig;
}
u32 Adler32(u32 crc, const void *buffer, u32 count)
u32 textureCRC(u8 * addr, u32 height, u32 stride)
{
register u32 s1 = crc & 0xFFFF;
register u32 s2 = (crc >> 16) & 0xFFFF;
int k;
const u8 *Buffer = (const u8*)buffer;
const u32 width = stride / 8;
const u32 line = stride % 8;
u64 crc = 0;
u64 twopixel_crc;
if (Buffer == NULL)
return 0;
while (count > 0) {
/* 5552 is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
k = (count < 5552 ? count : 5552);
count -= k;
while (k--) {
s1 += *Buffer++;
s2 += s1;
u32 * pixelpos = (u32*)addr;
for (; height; height--) {
int col = 0;
for (u32 i = width; i; --i) {
twopixel_crc = i * ((u64)(pixelpos[1] & 0xFFFEFFFE) + (u64)(pixelpos[0] & 0xFFFEFFFE) + crc);
crc = (twopixel_crc >> 32) + twopixel_crc;
pixelpos += 2;
}
/* 65521 is the largest prime smaller than 65536 */
s1 %= 65521;
s2 %= 65521;
crc = (height * crc >> 32) + height * crc;
pixelpos = (u32*)((u8*)pixelpos + line);
}
return (s2 << 16) | s1;
return crc&0xFFFFFFFF;
}

4
CRC.h
View File

@ -2,6 +2,8 @@
void CRC_BuildTable();
// CRC32
u32 CRC_Calculate( u32 crc, const void *buffer, u32 count );
u32 CRC_CalculatePalette( u32 crc, const void *buffer, u32 count );
u32 Adler32(u32 crc, const void *buffer, u32 count);
// Fast checksum calculation from Glide64
u32 textureCRC(u8 * addr, u32 height, u32 stride);

5
FrameBuffer.cpp
View File

@ -811,7 +811,8 @@ void FrameBufferToRDRAM::_copyWhite(FrameBuffer * _pBuffer)
}
}
}
_pBuffer->m_RdramCrc = Adler32(0, RDRAM + _pBuffer->m_startAddress, (VI.width*VI.height) << _pBuffer->m_size >> 1);
_pBuffer->m_RdramCrc = textureCRC(RDRAM + _pBuffer->m_startAddress, _pBuffer->m_height, _pBuffer->m_width << _pBuffer->m_size >> 1);
_pBuffer->m_cleared = false;
}
@ -880,7 +881,7 @@ void FrameBufferToRDRAM::CopyToRDRAM(u32 _address)
}
}
}
pBuffer->m_RdramCrc = Adler32(0, RDRAM + _address, (VI.width*VI.height) << pBuffer->m_size >> 1);
pBuffer->m_RdramCrc = textureCRC(RDRAM + pBuffer->m_startAddress, pBuffer->m_height, pBuffer->m_width << pBuffer->m_size >> 1);
pBuffer->m_cleared = false;
#ifndef GLES2
glUnmapBuffer(GL_PIXEL_PACK_BUFFER);

2
gDP.cpp
View File

@ -427,7 +427,7 @@ bool CheckForFrameBufferTexture(u32 _address, u32 _bytes)
else
frameBufferList().removeBuffer(pBuffer->m_startAddress);
} else if (pBuffer->m_RdramCrc != 0) {
const u32 crc = Adler32(0, RDRAM + pBuffer->m_startAddress, (VI.width*VI.height) << pBuffer->m_size >> 1);
const u32 crc = textureCRC(RDRAM + pBuffer->m_startAddress, pBuffer->m_height, pBuffer->m_width << pBuffer->m_size >> 1);
bRes = (pBuffer->m_RdramCrc == crc);
if (bRes)
pBuffer->m_validityChecked = RSP.DList;