1 files changed, 52 insertions, 0 deletions
diff --git a/gfx/gl/GLLibraryLoader.h b/gfx/gl/GLLibraryLoader.h
new file mode 100644
index 0000000000..e44e862f03
--- /dev/null
+++ b/gfx/gl/GLLibraryLoader.h
@@ -0,0 +1,52 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef GLLIBRARYLOADER_H_
+#define GLLIBRARYLOADER_H_
+
+#include <array>
+#include <stdio.h>
+
+#include "GLDefs.h"
+#include "nscore.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/SharedLibrary.h"
+
+namespace mozilla {
+namespace gl {
+
+struct SymLoadStruct final {
+  PRFuncPtr* symPointer;
+  std::array<const char*, 6> symNames;
+};
+
+void ClearSymbols(const SymLoadStruct* firstStruct);
+
+class SymbolLoader final {
+ public:
+  typedef PRFuncPtr(GLAPIENTRY* GetProcAddressT)(const char*);
+
+  GetProcAddressT mPfn = nullptr;  // Try this first, if not null.
+  PRLibrary* mLib = nullptr;
+
+  explicit SymbolLoader(void*(GLAPIENTRY* pfn)(const char*))
+      : mPfn(GetProcAddressT(pfn)) {
+    MOZ_ASSERT(mPfn);
+  }
+
+  explicit SymbolLoader(const GetProcAddressT pfn) : mPfn(pfn) {
+    MOZ_ASSERT(mPfn);
+  }
+
+  explicit SymbolLoader(PRLibrary& lib) : mLib(&lib) { MOZ_ASSERT(mLib); }
+
+  PRFuncPtr GetProcAddress(const char*) const;
+  bool LoadSymbols(const SymLoadStruct* firstStruct,
+                   bool warnOnFailures = true) const;
+};
+
+}  // namespace gl
+}  // namespace mozilla
+
+#endif  // GLLIBRARYLOADER_H_