rasterizer_cache: Add support for texture dumping

src/common/bit_util.h

@@ -0,0 +1,66 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <bit>
+#include <climits>
+#include <cstddef>
+#include <type_traits>
+
+#include "common/common_types.h"
+
+namespace Common {
+
+/// Gets the size of a specified type T in bits.
+template <typename T>
+[[nodiscard]] constexpr std::size_t BitSize() {
+    return sizeof(T) * CHAR_BIT;
+}
+
+[[nodiscard]] constexpr u32 MostSignificantBit32(const u32 value) {
+    return 31U - static_cast<u32>(std::countl_zero(value));
+}
+
+[[nodiscard]] constexpr u32 MostSignificantBit64(const u64 value) {
+    return 63U - static_cast<u32>(std::countl_zero(value));
+}
+
+[[nodiscard]] constexpr u32 Log2Floor32(const u32 value) {
+    return MostSignificantBit32(value);
+}
+
+[[nodiscard]] constexpr u32 Log2Floor64(const u64 value) {
+    return MostSignificantBit64(value);
+}
+
+[[nodiscard]] constexpr u32 Log2Ceil32(const u32 value) {
+    const u32 log2_f = Log2Floor32(value);
+    return log2_f + static_cast<u32>((value ^ (1U << log2_f)) != 0U);
+}
+
+[[nodiscard]] constexpr u32 Log2Ceil64(const u64 value) {
+    const u64 log2_f = Log2Floor64(value);
+    return static_cast<u32>(log2_f + static_cast<u64>((value ^ (1ULL << log2_f)) != 0ULL));
+}
+
+template <typename T>
+    requires std::is_unsigned_v<T>
+[[nodiscard]] constexpr bool IsPow2(T value) {
+    return std::has_single_bit(value);
+}
+
+template <typename T>
+    requires std::is_integral_v<T>
+[[nodiscard]] T NextPow2(T value) {
+    return static_cast<T>(1ULL << ((8U * sizeof(T)) - std::countl_zero(value - 1U)));
+}
+
+template <size_t bit_index, typename T>
+    requires std::is_integral_v<T>
+[[nodiscard]] constexpr bool Bit(const T value) {
+    static_assert(bit_index < BitSize<T>(), "bit_index must be smaller than size of T");
+    return ((value >> bit_index) & T(1)) == T(1);
+}
+
+} // namespace Common