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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/gl/gl_implementation_osmesa.h"
      6 
      7 #include "base/files/file_path.h"
      8 #include "base/logging.h"
      9 #include "base/native_library.h"
     10 #include "base/path_service.h"
     11 #include "ui/gl/gl_bindings.h"
     12 #include "ui/gl/gl_gl_api_implementation.h"
     13 #include "ui/gl/gl_implementation.h"
     14 #include "ui/gl/gl_osmesa_api_implementation.h"
     15 
     16 namespace gfx {
     17 
     18 base::NativeLibrary LoadLibraryAndPrintError(const base::FilePath& filename) {
     19   base::NativeLibraryLoadError error;
     20   base::NativeLibrary library = base::LoadNativeLibrary(filename, &error);
     21   if (!library) {
     22     LOG(ERROR) << "Failed to load " << filename.MaybeAsASCII() << ": "
     23                << error.ToString();
     24     return NULL;
     25   }
     26   return library;
     27 }
     28 
     29 base::NativeLibrary LoadLibraryAndPrintError(const char* filename) {
     30   return LoadLibraryAndPrintError(base::FilePath(filename));
     31 }
     32 
     33 bool InitializeStaticGLBindingsOSMesaGL() {
     34   base::FilePath module_path;
     35   if (!PathService::Get(base::DIR_MODULE, &module_path)) {
     36     LOG(ERROR) << "PathService::Get failed.";
     37     return false;
     38   }
     39 
     40   base::FilePath library_path = module_path.Append("libosmesa.so");
     41   base::NativeLibrary library = LoadLibraryAndPrintError(library_path);
     42   if (!library)
     43     return false;
     44 
     45   GLGetProcAddressProc get_proc_address =
     46       reinterpret_cast<GLGetProcAddressProc>(
     47           base::GetFunctionPointerFromNativeLibrary(library,
     48                                                     "OSMesaGetProcAddress"));
     49   if (!get_proc_address) {
     50     LOG(ERROR) << "OSMesaGetProcAddress not found.";
     51     base::UnloadNativeLibrary(library);
     52     return false;
     53   }
     54 
     55   SetGLGetProcAddressProc(get_proc_address);
     56   AddGLNativeLibrary(library);
     57   SetGLImplementation(kGLImplementationOSMesaGL);
     58 
     59   InitializeStaticGLBindingsGL();
     60   InitializeStaticGLBindingsOSMESA();
     61   return true;
     62 }
     63 
     64 }  // namespace gfx
     65