1 files changed, 140 insertions, 0 deletions
diff --git a/ui/gl/gl_implementation_mac.cc b/ui/gl/gl_implementation_mac.cc
new file mode 100644
index 0000000..f05e3eb9
--- /dev/null
+++ b/ui/gl/gl_implementation_mac.cc
@@ -0,0 +1,140 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/base_paths.h"
+#include "base/file_path.h"
+#include "base/logging.h"
+#include "base/mac/foundation_util.h"
+#include "base/native_library.h"
+#include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
+#include "ui/gl/gl_bindings.h"
+#include "ui/gl/gl_implementation.h"
+
+namespace gfx {
+namespace {
+const char kOpenGLFrameworkPath[] =
+    "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
+}  // namespace anonymous
+
+void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
+  impls->push_back(kGLImplementationDesktopGL);
+  impls->push_back(kGLImplementationAppleGL);
+  impls->push_back(kGLImplementationOSMesaGL);
+}
+
+bool InitializeGLBindings(GLImplementation implementation) {
+  // Prevent reinitialization with a different implementation. Once the gpu
+  // unit tests have initialized with kGLImplementationMock, we don't want to
+  // later switch to another GL implementation.
+  if (GetGLImplementation() != kGLImplementationNone)
+    return true;
+
+  // Allow the main thread or another to initialize these bindings
+  // after instituting restrictions on I/O. Going forward they will
+  // likely be used in the browser process on most platforms. The
+  // one-time initialization cost is small, between 2 and 5 ms.
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
+
+  switch (implementation) {
+    case kGLImplementationOSMesaGL: {
+      // osmesa.so is located in the build directory. This code path is only
+      // valid in a developer build environment.
+      FilePath exe_path;
+      if (!PathService::Get(base::FILE_EXE, &exe_path)) {
+        LOG(ERROR) << "PathService::Get failed.";
+        return false;
+      }
+      FilePath bundle_path = base::mac::GetAppBundlePath(exe_path);
+      FilePath build_dir_path = bundle_path.DirName();
+      FilePath osmesa_path = build_dir_path.Append("osmesa.so");
+
+      // When using OSMesa, just use OSMesaGetProcAddress to find entry points.
+      base::NativeLibrary library = base::LoadNativeLibrary(osmesa_path, NULL);
+      if (!library) {
+        LOG(ERROR) << "osmesa.so not found at " << osmesa_path.value();
+        return false;
+      }
+
+      GLGetProcAddressProc get_proc_address =
+          reinterpret_cast<GLGetProcAddressProc>(
+              base::GetFunctionPointerFromNativeLibrary(
+                  library, "OSMesaGetProcAddress"));
+      if (!get_proc_address) {
+        LOG(ERROR) << "OSMesaGetProcAddress not found.";
+        base::UnloadNativeLibrary(library);
+        return false;
+      }
+
+      SetGLGetProcAddressProc(get_proc_address);
+      AddGLNativeLibrary(library);
+      SetGLImplementation(kGLImplementationOSMesaGL);
+
+      InitializeGLBindingsGL();
+      InitializeGLBindingsOSMESA();
+      break;
+    }
+    case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL: {
+      base::NativeLibrary library = base::LoadNativeLibrary(
+          FilePath(kOpenGLFrameworkPath), NULL);
+      if (!library) {
+        LOG(ERROR) << "OpenGL framework not found";
+        return false;
+      }
+
+      AddGLNativeLibrary(library);
+      SetGLImplementation(implementation);
+
+      InitializeGLBindingsGL();
+      break;
+    }
+    case kGLImplementationMockGL: {
+      SetGLGetProcAddressProc(GetMockGLProcAddress);
+      SetGLImplementation(kGLImplementationMockGL);
+      InitializeGLBindingsGL();
+      break;
+    }
+    default:
+      return false;
+  }
+
+  return true;
+}
+
+bool InitializeGLExtensionBindings(GLImplementation implementation,
+    GLContext* context) {
+  switch (implementation) {
+    case kGLImplementationOSMesaGL:
+      InitializeGLExtensionBindingsGL(context);
+      InitializeGLExtensionBindingsOSMESA(context);
+      break;
+    case kGLImplementationDesktopGL:
+    case kGLImplementationAppleGL:
+      InitializeGLExtensionBindingsGL(context);
+      break;
+    case kGLImplementationMockGL:
+      InitializeGLExtensionBindingsGL(context);
+      break;
+    default:
+      return false;
+  }
+
+  return true;
+}
+
+void InitializeDebugGLBindings() {
+  InitializeDebugGLBindingsGL();
+  InitializeDebugGLBindingsOSMESA();
+}
+
+void ClearGLBindings() {
+  ClearGLBindingsGL();
+  ClearGLBindingsOSMESA();
+  SetGLImplementation(kGLImplementationNone);
+
+  UnloadGLNativeLibraries();
+}
+
+}  // namespace gfx