Move static GL binding initialization to //ui/gl/init.

ui/gl/init/gl_initializer_mac.cc

Index: ui/gl/init/gl_initializer_mac.cc
diff --git a/ui/gl/init/gl_initializer_mac.cc b/ui/gl/init/gl_initializer_mac.cc
index d62a47c5b1e40b64fb55bb2c95e6513ebb65fa8e..fb07b803fa58be94e13bf944a40a90a1f18a874b 100644
--- a/ui/gl/init/gl_initializer_mac.cc
+++ b/ui/gl/init/gl_initializer_mac.cc
@@ -8,9 +8,17 @@
 
 #include <vector>
 
+#include "base/base_paths.h"
+#include "base/files/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_gl_api_implementation.h"
 #include "ui/gl/gl_implementation.h"
+#include "ui/gl/gl_osmesa_api_implementation.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/gpu_switching_manager.h"
 
@@ -19,6 +27,9 @@ namespace init {
 
 namespace {
 
+const char kOpenGLFrameworkPath[] =
+    "/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
+
 bool InitializeOneOffForSandbox() {
   static bool initialized = false;
   if (initialized)
@@ -57,6 +68,64 @@ bool InitializeOneOffForSandbox() {
   return true;
 }
 
+bool InitializeStaticOSMesaInternal() {
+  // osmesa.so is located in the build directory. This code path is only
+  // valid in a developer build environment.
+  base::FilePath exe_path;
+  if (!PathService::Get(base::FILE_EXE, &exe_path)) {
+    LOG(ERROR) << "PathService::Get failed.";
+    return false;
+  }
+  base::FilePath bundle_path = base::mac::GetAppBundlePath(exe_path);
+  // Some unit test targets depend on osmesa but aren't built as app
+  // bundles. In that case, the .so is next to the executable.
+  if (bundle_path.empty())
+    bundle_path = exe_path;
+  base::FilePath build_dir_path = bundle_path.DirName();
+  base::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);
+
+  InitializeStaticGLBindingsGL();
+  InitializeStaticGLBindingsOSMESA();
+
+  return true;
+}
+
+bool InitializeStaticCGLInternal(GLImplementation implementation) {
+  base::NativeLibrary library =
+      base::LoadNativeLibrary(base::FilePath(kOpenGLFrameworkPath), nullptr);
+  if (!library) {
+    LOG(ERROR) << "OpenGL framework not found";
+    return false;
+  }
+
+  AddGLNativeLibrary(library);
+  SetGLImplementation(implementation);
+
+  InitializeStaticGLBindingsGL();
+  return true;
+}
+
 }  // namespace
 
 bool InitializeGLOneOffPlatform() {
@@ -74,5 +143,45 @@ bool InitializeGLOneOffPlatform() {
   }
 }
 
+bool InitializeStaticGLBindings(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.
+  DCHECK_EQ(kGLImplementationNone, GetGLImplementation());
+
+  // 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:
+      return InitializeStaticOSMesaInternal();
+    case kGLImplementationDesktopGL:
+    case kGLImplementationDesktopGLCoreProfile:
+    case kGLImplementationAppleGL:
+      return InitializeStaticCGLInternal(implementation);
+    case kGLImplementationMockGL:
+      SetGLImplementation(kGLImplementationMockGL);
+      InitializeStaticGLBindingsGL();
+      return true;
+    default:
+      NOTREACHED();
+  }
+
+  return false;
+}
+
+void InitializeDebugGLBindings() {
+  InitializeDebugGLBindingsGL();
+  InitializeDebugGLBindingsOSMESA();
+}
+
+void ClearGLBindingsPlatform() {
+  ClearGLBindingsGL();
+  ClearGLBindingsOSMESA();
+}
+
 }  // namespace init
 }  // namespace gl