4 files changed, 53 insertions, 35 deletions

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index f77575a00..bfd11e76d 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -138,6 +138,8 @@ add_library(common STATIC
     microprofile.h
     microprofileui.h
     misc.cpp
+    nvidia_flags.cpp
+    nvidia_flags.h
     page_table.cpp
     page_table.h
     param_package.cpp
diff --git a/src/common/bit_util.h b/src/common/bit_util.h
index 685e7fc9b..64520ca4e 100644
--- a/src/common/bit_util.h
+++ b/src/common/bit_util.h
@@ -4,13 +4,10 @@
 
 #pragma once
 
+#include <bit>
 #include <climits>
 #include <cstddef>
 
-#ifdef _MSC_VER
-#include <intrin.h>
-#endif
-
 #include "common/common_types.h"
 
 namespace Common {
@@ -21,48 +18,30 @@ template <typename T>
     return sizeof(T) * CHAR_BIT;
 }
 
-#ifdef _MSC_VER
-
-[[nodiscard]] inline u32 MostSignificantBit32(const u32 value) {
-    unsigned long result;
-    _BitScanReverse(&result, value);
-    return static_cast<u32>(result);
-}
-
-[[nodiscard]] inline u32 MostSignificantBit64(const u64 value) {
-    unsigned long result;
-    _BitScanReverse64(&result, value);
-    return static_cast<u32>(result);
-}
-
-#else
-
-[[nodiscard]] inline u32 MostSignificantBit32(const u32 value) {
-    return 31U - static_cast<u32>(__builtin_clz(value));
+[[nodiscard]] constexpr u32 MostSignificantBit32(const u32 value) {
+    return 31U - static_cast<u32>(std::countl_zero(value));
 }
 
-[[nodiscard]] inline u32 MostSignificantBit64(const u64 value) {
-    return 63U - static_cast<u32>(__builtin_clzll(value));
+[[nodiscard]] constexpr u32 MostSignificantBit64(const u64 value) {
+    return 63U - static_cast<u32>(std::countl_zero(value));
 }
 
-#endif
-
-[[nodiscard]] inline u32 Log2Floor32(const u32 value) {
+[[nodiscard]] constexpr u32 Log2Floor32(const u32 value) {
     return MostSignificantBit32(value);
 }
 
-[[nodiscard]] inline u32 Log2Ceil32(const u32 value) {
-    const u32 log2_f = Log2Floor32(value);
-    return log2_f + ((value ^ (1U << log2_f)) != 0U);
+[[nodiscard]] constexpr u32 Log2Floor64(const u64 value) {
+    return MostSignificantBit64(value);
 }
 
-[[nodiscard]] inline 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]] inline u32 Log2Ceil64(const u64 value) {
-    const u64 log2_f = static_cast<u64>(Log2Floor64(value));
-    return static_cast<u32>(log2_f + ((value ^ (1ULL << log2_f)) != 0ULL));
+[[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));
 }
 
 } // namespace Common
diff --git a/src/common/nvidia_flags.cpp b/src/common/nvidia_flags.cpp
new file mode 100644
index 000000000..d537517db
--- /dev/null
+++ b/src/common/nvidia_flags.cpp
@@ -0,0 +1,27 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <filesystem>
+#include <stdlib.h>
+
+#include <fmt/format.h>
+
+#include "common/file_util.h"
+#include "common/nvidia_flags.h"
+
+namespace Common {
+
+void ConfigureNvidiaEnvironmentFlags() {
+#ifdef _WIN32
+    const std::string shader_path = Common::FS::SanitizePath(
+        fmt::format("{}/nvidia/", Common::FS::GetUserPath(Common::FS::UserPath::ShaderDir)));
+    const std::string windows_path =
+        Common::FS::SanitizePath(shader_path, Common::FS::DirectorySeparator::BackwardSlash);
+    void(Common::FS::CreateFullPath(shader_path + '/'));
+    void(_putenv(fmt::format("__GL_SHADER_DISK_CACHE_PATH={}", windows_path).c_str()));
+    void(_putenv("__GL_SHADER_DISK_CACHE_SKIP_CLEANUP=1"));
+#endif
+}
+
+} // namespace Common
diff --git a/src/common/nvidia_flags.h b/src/common/nvidia_flags.h
new file mode 100644
index 000000000..75a0233ac
--- /dev/null
+++ b/src/common/nvidia_flags.h
@@ -0,0 +1,10 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+namespace Common {
+
+/// Configure platform specific flags for Nvidia's driver
+void ConfigureNvidiaEnvironmentFlags();
+
+} // namespace Common