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 <stdio.h>
   9
  10 #ifdef WIN32
  11 #include <windows.h>
  12 #endif
  13
  14 #include "GLDefs.h"
  15 #include "nscore.h"
  16 #include "prlink.h"
  17
  18 namespace mozilla {
  19 namespace gl {
  20
  21 class GLLibraryLoader
  22 {
  23 public:
  24     bool OpenLibrary(const char *library);
  25
  26     typedef PRFuncPtr (GLAPIENTRY * PlatformLookupFunction) (const char *);
  27
  28     enum {
  29         MAX_SYMBOL_NAMES = 6,
  30         MAX_SYMBOL_LENGTH = 128
  31     };
  32
  33     typedef struct {
  34         PRFuncPtr *symPointer;
  35         const char *symNames[MAX_SYMBOL_NAMES];
  36     } SymLoadStruct;
  37
  38     bool LoadSymbols(SymLoadStruct *firstStruct,
  39                      bool tryplatform = false,
  40                      const char *prefix = nullptr,
  41                      bool warnOnFailure = true);
  42
  43     /*
  44      * Static version of the functions in this class
  45      */
  46     static PRFuncPtr LookupSymbol(PRLibrary *lib,
  47                                   const char *symname,
  48                                   PlatformLookupFunction lookupFunction = nullptr);
  49     static bool LoadSymbols(PRLibrary *lib,
  50                             SymLoadStruct *firstStruct,
  51                             PlatformLookupFunction lookupFunction = nullptr,
  52                             const char *prefix = nullptr,
  53                             bool warnOnFailure = true);
  54 protected:
  55     GLLibraryLoader() {
  56         mLibrary = nullptr;
  57         mLookupFunc = nullptr;
  58     }
  59
  60     PRLibrary *mLibrary;
  61     PlatformLookupFunction mLookupFunc;
  62 };
  63
  64 } /* namespace gl */
  65 } /* namespace mozilla */
  66
  67 #endif /* GLLIBRARYLOADER_H_ */