renderer_opengl: Avoid precompiled cache and force NV GL cache directory

Setting __GL_SHADER_DISK_CACHE_PATH we can force the cache directory to
be in yuzu's user directory to stop commonly distributed malware from
deleting our driver shader cache. And by setting
__GL_SHADER_DISK_CACHE_SKIP_CLEANUP we can have an unbounded shader
cache size.

This has only been implemented on Windows, mostly because previous tests
didn't seem to work on Linux.

Disable the precompiled cache on Nvidia's driver. There's no need to
hide information the driver already has in its own cache.

3 files changed, 39 insertions, 0 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/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