[common] unify std::random_device (#3801)

Signed-off-by: lizzie <lizzie@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3801
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: lizzie <lizzie@eden-emu.dev>
Co-committed-by: lizzie <lizzie@eden-emu.dev>

src/common/CMakeLists.txt

@@ -134,6 +134,8 @@ add_library(
     typed_address.h
     uint128.h
     unique_function.h
+    random.cpp
+    random.h
     uuid.cpp
     uuid.h
     vector_math.h

src/common/random.cpp

@@ -0,0 +1,19 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <random>
+#include "common/random.h"
+
+static std::random_device g_random_device;
+
+namespace Common::Random {
+    [[nodiscard]] u32 Random32(u32 seed) noexcept {
+        return g_random_device();
+    }
+    [[nodiscard]] u64 Random64(u64 seed) noexcept {
+        return g_random_device();
+    }
+    [[nodiscard]] std::mt19937 GetMT19937() noexcept {
+        return std::mt19937(g_random_device());
+    }
+}

src/common/random.h

@@ -0,0 +1,13 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <random>
+#include "common/common_types.h"
+
+namespace Common::Random {
+    [[nodiscard]] u32 Random32(u32 seed) noexcept;
+    [[nodiscard]] u64 Random64(u64 seed) noexcept;
+    [[nodiscard]] std::mt19937 GetMT19937() noexcept;
+}

src/common/tiny_mt.h

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
@@ -218,12 +218,6 @@ public:
         return t0;
     }
 
-    u64 GenerateRandomU64() {
-        const u32 lo = this->GenerateRandomU32();
-        const u32 hi = this->GenerateRandomU32();
-        return (u64{hi} << 32) | u64{lo};
-    }
-
     float GenerateRandomF32() {
         // Floats have 24 bits of mantissa.
         constexpr u32 MantissaBits = 24;

src/common/uuid.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2022 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -10,6 +13,7 @@
 #include "common/assert.h"
 #include "common/tiny_mt.h"
 #include "common/uuid.h"
+#include "common/random.h"
 
 namespace Common {
 
@@ -175,21 +179,16 @@ u128 UUID::AsU128() const {
 }
 
 UUID UUID::MakeRandom() {
-    std::random_device device;
-
-    return MakeRandomWithSeed(device());
+    return MakeRandomWithSeed(Common::Random::Random32(0));
 }
 
 UUID UUID::MakeRandomWithSeed(u32 seed) {
     // Create and initialize our RNG.
     TinyMT rng;
     rng.Initialize(seed);
-
     UUID uuid;
-
     // Populate the UUID with random bytes.
     rng.GenerateRandomBytes(uuid.uuid.data(), sizeof(UUID));
-
     return uuid;
 }