rsx: Refactor texture cache utils

- Also lays groundwork for optional hashed sections
2021-01-25 19:31:00 +03:00
parent 8d6504d6e3
commit 1bad9a939f
10 changed files with 465 additions and 395 deletions
@@ -4,23 +4,33 @@

 namespace rpcs3
 {
+	constexpr usz fnv_seed = 14695981039346656037ull;
+	constexpr usz fnv_prime = 1099511628211ull;
+
 	template<typename T>
 	static usz hash_base(T value)
 	{
 		return static_cast<usz>(value);
 	}

+	template<typename T, typename = std::enable_if_t<std::is_integral<T>::value, bool>>
+	static inline usz hash64(usz hash_value, const T data)
+	{
+		hash_value ^= data;
+		hash_value *= fnv_prime;
+		return hash_value;
+	}
+
 	template<typename T, typename U>
 	static usz hash_struct_base(const T& value)
 	{
 		// FNV 64-bit
-		usz result = 14695981039346656037ull;
+		usz result = fnv_seed;
 		const U *bits = reinterpret_cast<const U*>(&value);

 		for (usz n = 0; n < (sizeof(T) / sizeof(U)); ++n)
 		{
-			result ^= bits[n];
-			result *= 1099511628211ull;
+			result = hash64(result, bits[n]);
 		}

 		return result;