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Common/Hash: use zlib-ng for adler32. small cleanups.

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This commit is contained in:
Shawn Hoffman
2022-07-22 08:52:26 -07:00
parent fb45ed3981
commit 17c554c165
5 changed files with 190 additions and 252 deletions
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32
Source/Core/VideoCommon/NativeVertexFormat.h
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@ -7,7 +7,6 @@
#include <functional> // for hash
#include "Common/CommonTypes.h"
#include "Common/Hash.h"
#include "VideoCommon/CPMemory.h"
// m_components
@ -79,10 +78,37 @@ namespace std
template <>
struct hash<PortableVertexDeclaration>
{
size_t operator()(const PortableVertexDeclaration& decl) const
// Implementation from Wikipedia.
template <typename T>
u32 Fletcher32(const T& data) const
{
return Common::HashFletcher(reinterpret_cast<const u8*>(&decl), sizeof(decl));
static_assert(sizeof(T) % sizeof(u16) == 0);
auto buf = reinterpret_cast<const u16*>(&data);
size_t len = sizeof(T) / sizeof(u16);
u32 sum1 = 0xffff, sum2 = 0xffff;
while (len)
{
size_t tlen = len > 360 ? 360 : len;
len -= tlen;
do
{
sum1 += *buf++;
sum2 += sum1;
} while (--tlen);
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
}
// Second reduction step to reduce sums to 16 bits
sum1 = (sum1 & 0xffff) + (sum1 >> 16);
sum2 = (sum2 & 0xffff) + (sum2 >> 16);
return (sum2 << 16 | sum1);
}
size_t operator()(const PortableVertexDeclaration& decl) const { return Fletcher32(decl); }
};
} // namespace std