gfx/gl/GLLibraryLoader.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #ifndef GLLIBRARYLOADER_H_
   6 #define GLLIBRARYLOADER_H_
   7
   8 #include <array>
   9 #include <stdio.h>
  10
  11 #include "GLDefs.h"
  12 #include "nscore.h"
  13 #include "mozilla/Assertions.h"
  14 #include "mozilla/SharedLibrary.h"
  15
  16 namespace mozilla {
  17 namespace gl {
  18
  19 struct SymLoadStruct final {
  20   PRFuncPtr* symPointer;
  21   std::array<const char*, 6> symNames;
  22 };
  23
  24 void ClearSymbols(const SymLoadStruct* firstStruct);
  25
  26 class SymbolLoader final {
  27  public:
  28   typedef PRFuncPtr(GLAPIENTRY* GetProcAddressT)(const char*);
  29
  30   GetProcAddressT mPfn = nullptr;  // Try this first, if not null.
  31   PRLibrary* mLib = nullptr;
  32
  33   explicit SymbolLoader(void*(GLAPIENTRY* pfn)(const char*))
  34       : mPfn(GetProcAddressT(pfn)) {
  35     MOZ_ASSERT(mPfn);
  36   }
  37
  38   explicit SymbolLoader(const GetProcAddressT pfn) : mPfn(pfn) {
  39     MOZ_ASSERT(mPfn);
  40   }
  41
  42   explicit SymbolLoader(PRLibrary& lib) : mLib(&lib) { MOZ_ASSERT(mLib); }
  43
  44   PRFuncPtr GetProcAddress(const char*) const;
  45   bool LoadSymbols(const SymLoadStruct* firstStruct,
  46                    bool warnOnFailures = true) const;
  47 };
  48
  49 }  // namespace gl
  50 }  // namespace mozilla
  51
  52 #endif  // GLLIBRARYLOADER_H_