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3923bfcc01
Skips the overhead of having to lookup each shader stage individually. Additionally, having whole sets as a lookup key gives us a more trustworthy heuristic than if we only have independent information for each shader stage. We can use this to skip shader hashing most of the time when they are part of a known set.
43 lines
886 B
C++
43 lines
886 B
C++
#pragma once
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// hashes two separate streams at once for better parallelism, combined into one final uint64 hash at the end
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// inspired by xxHash and MurmurHash3
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class DualStateHasher
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{
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public:
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FORCEINLINE DualStateHasher()
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{
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m_h0 = 0x9E3779B97F4A7C15;
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m_h1 = 0xC2B2AE3D27D4EB4F;
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};
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FORCEINLINE void MixIn(uint64 a, uint64 b)
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{
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uint64 tmp = m_h1;
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m_h1 = (m_h0 ^ a) * 0x85EBCA77C2B2AE63ULL;
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m_h0 = (tmp ^ b) * 0x165667B19E3779F9ULL;
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}
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FORCEINLINE void MixInSingle(uint64 a)
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{
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uint64 tmp = m_h1;
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m_h1 = (m_h0 ^ a) * 0x85EBCA77C2B2AE63ULL;
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m_h0 = tmp;
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}
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FORCEINLINE uint64 Finish()
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{
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uint64 combined = m_h0 ^ std::rotl(m_h1, 31);
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combined ^= combined >> 33;
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combined *= 0xff51afd7ed558ccdULL;
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combined ^= combined >> 33;
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combined *= 0xc4ceb9fe1a85ec53ULL;
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combined ^= combined >> 33;
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return combined;
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}
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private:
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uint64 m_h0;
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uint64 m_h1;
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};
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