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

ui/gl/gl_implementation_win.cc

Index: ui/gl/gl_implementation_win.cc
diff --git a/ui/gl/gl_implementation_win.cc b/ui/gl/gl_implementation_win.cc
index 9a470c9198576509dff00423351328484934455b..4b1db59672eeaa143add6292b3d0cbf3d271e03d 100644
--- a/ui/gl/gl_implementation_win.cc
+++ b/ui/gl/gl_implementation_win.cc
@@ -2,20 +2,298 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gl/gl_implementation.h"
-
+#include <vector>
+
+#include "base/at_exit.h"
+#include "base/base_paths.h"
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/lazy_instance.h"
+#include "base/logging.h"
+#include "base/native_library.h"
+#include "base/path_service.h"
+#include "base/strings/stringprintf.h"
+#include "base/threading/thread_restrictions.h"
+#include "base/trace_event/trace_event.h"
+#include "base/win/windows_version.h"
+// TODO(jmadill): Apply to all platforms eventually
+#include "ui/gl/angle_platform_impl.h"
+#include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context_stub_with_extensions.h"
 #include "ui/gl/gl_egl_api_implementation.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_wgl.h"
 #include "ui/gl/gl_wgl_api_implementation.h"
 
+#if defined(ENABLE_SWIFTSHADER)
+#include "software_renderer.h"
+#endif
+
 namespace gl {
+
+namespace {
+
+const wchar_t kD3DCompiler[] = L"D3DCompiler_47.dll";
+
+void GL_BINDING_CALL MarshalClearDepthToClearDepthf(GLclampd depth) {
+  glClearDepthf(static_cast<GLclampf>(depth));
+}
+
+void GL_BINDING_CALL MarshalDepthRangeToDepthRangef(GLclampd z_near,
+                                                    GLclampd z_far) {
+  glDepthRangef(static_cast<GLclampf>(z_near), static_cast<GLclampf>(z_far));
+}
+
+bool LoadD3DXLibrary(const base::FilePath& module_path,
+                     const base::FilePath::StringType& name) {
+  base::NativeLibrary library =
+      base::LoadNativeLibrary(base::FilePath(name), NULL);
+  if (!library) {
+    library = base::LoadNativeLibrary(module_path.Append(name), NULL);
+    if (!library) {
+      DVLOG(1) << name << " not found.";
+      return false;
+    }
+  }
+  return true;
+}
+
+// TODO(jmadill): Apply to all platforms eventually
+base::LazyInstance<ANGLEPlatformImpl> g_angle_platform_impl =
+    LAZY_INSTANCE_INITIALIZER;
+
+ANGLEPlatformShutdownFunc g_angle_platform_shutdown = nullptr;
+
+}  // namespace
 
 void GetAllowedGLImplementations(std::vector<GLImplementation>* impls) {
   impls->push_back(kGLImplementationEGLGLES2);
   impls->push_back(kGLImplementationDesktopGL);
   impls->push_back(kGLImplementationOSMesaGL);
+}
+
+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: {
+      base::FilePath module_path;
+      PathService::Get(base::DIR_MODULE, &module_path);
+      base::NativeLibrary library = base::LoadNativeLibrary(
+          module_path.Append(L"osmesa.dll"), NULL);
+      if (!library) {
+        PathService::Get(base::DIR_EXE, &module_path);
+        library = base::LoadNativeLibrary(
+            module_path.Append(L"osmesa.dll"), NULL);
+        if (!library) {
+          DVLOG(1) << "osmesa.dll not found";
+          return false;
+        }
+      }
+
+      GLGetProcAddressProc get_proc_address =
+          reinterpret_cast<GLGetProcAddressProc>(
+              base::GetFunctionPointerFromNativeLibrary(
+                  library, "OSMesaGetProcAddress"));
+      if (!get_proc_address) {
+        DLOG(ERROR) << "OSMesaGetProcAddress not found.";
+        base::UnloadNativeLibrary(library);
+        return false;
+      }
+
+      SetGLGetProcAddressProc(get_proc_address);
+      AddGLNativeLibrary(library);
+      SetGLImplementation(kGLImplementationOSMesaGL);
+
+      InitializeStaticGLBindingsGL();
+      InitializeStaticGLBindingsOSMESA();
+      break;
+    }
+    case kGLImplementationEGLGLES2: {
+      base::FilePath module_path;
+      if (!PathService::Get(base::DIR_MODULE, &module_path))
+        return false;
+
+      // Attempt to load the D3DX shader compiler using the default search path
+      // and if that fails, using an absolute path. This is to ensure these DLLs
+      // are loaded before ANGLE is loaded in case they are not in the default
+      // search path.
+      LoadD3DXLibrary(module_path, kD3DCompiler);
+
+      base::FilePath gles_path;
+      const base::CommandLine* command_line =
+          base::CommandLine::ForCurrentProcess();
+      bool using_swift_shader =
+          command_line->GetSwitchValueASCII(switches::kUseGL) ==
+          kGLImplementationSwiftShaderName;
+      if (using_swift_shader) {
+        if (!command_line->HasSwitch(switches::kSwiftShaderPath))
+          return false;
+        gles_path =
+            command_line->GetSwitchValuePath(switches::kSwiftShaderPath);
+        // Preload library
+        LoadLibrary(L"ddraw.dll");
+      } else {
+        gles_path = module_path;
+      }
+
+      // Load libglesv2.dll before libegl.dll because the latter is dependent on
+      // the former and if there is another version of libglesv2.dll in the dll
+      // search path, it will get loaded instead.
+      base::NativeLibrary gles_library = base::LoadNativeLibrary(
+          gles_path.Append(L"libglesv2.dll"), NULL);
+      if (!gles_library) {
+        DVLOG(1) << "libglesv2.dll not found";
+        return false;
+      }
+
+      // When using EGL, first try eglGetProcAddress and then Windows
+      // GetProcAddress on both the EGL and GLES2 DLLs.
+      base::NativeLibrary egl_library = base::LoadNativeLibrary(
+          gles_path.Append(L"libegl.dll"), NULL);
+      if (!egl_library) {
+        DVLOG(1) << "libegl.dll not found.";
+        base::UnloadNativeLibrary(gles_library);
+        return false;
+      }
+
+#if defined(ENABLE_SWIFTSHADER)
+      if (using_swift_shader) {
+        SetupSoftwareRenderer(gles_library);
+      }
+#endif
+
+      if (!using_swift_shader) {
+        // Init ANGLE platform here, before we call GetPlatformDisplay().
+        // TODO(jmadill): Apply to all platforms eventually
+        ANGLEPlatformInitializeFunc angle_platform_init =
+            reinterpret_cast<ANGLEPlatformInitializeFunc>(
+                base::GetFunctionPointerFromNativeLibrary(
+                    gles_library,
+                    "ANGLEPlatformInitialize"));
+        if (angle_platform_init) {
+          angle_platform_init(&g_angle_platform_impl.Get());
+
+          g_angle_platform_shutdown =
+              reinterpret_cast<ANGLEPlatformShutdownFunc>(
+                  base::GetFunctionPointerFromNativeLibrary(
+                      gles_library,
+                      "ANGLEPlatformShutdown"));
+        }
+      }
+
+      GLGetProcAddressProc get_proc_address =
+          reinterpret_cast<GLGetProcAddressProc>(
+              base::GetFunctionPointerFromNativeLibrary(
+                  egl_library, "eglGetProcAddress"));
+      if (!get_proc_address) {
+        LOG(ERROR) << "eglGetProcAddress not found.";
+        base::UnloadNativeLibrary(egl_library);
+        base::UnloadNativeLibrary(gles_library);
+        return false;
+      }
+
+      SetGLGetProcAddressProc(get_proc_address);
+      AddGLNativeLibrary(egl_library);
+      AddGLNativeLibrary(gles_library);
+      SetGLImplementation(kGLImplementationEGLGLES2);
+
+      InitializeStaticGLBindingsGL();
+      InitializeStaticGLBindingsEGL();
+
+      // These two functions take single precision float rather than double
+      // precision float parameters in GLES.
+      ::gl::g_driver_gl.fn.glClearDepthFn = MarshalClearDepthToClearDepthf;
+      ::gl::g_driver_gl.fn.glDepthRangeFn = MarshalDepthRangeToDepthRangef;
+      break;
+    }
+    case kGLImplementationDesktopGL: {
+      base::NativeLibrary library = base::LoadNativeLibrary(
+          base::FilePath(L"opengl32.dll"), NULL);
+      if (!library) {
+        DVLOG(1) << "opengl32.dll not found";
+        return false;
+      }
+
+      GLGetProcAddressProc get_proc_address =
+          reinterpret_cast<GLGetProcAddressProc>(
+              base::GetFunctionPointerFromNativeLibrary(
+                  library, "wglGetProcAddress"));
+      if (!get_proc_address) {
+        LOG(ERROR) << "wglGetProcAddress not found.";
+        base::UnloadNativeLibrary(library);
+        return false;
+      }
+
+      SetGLGetProcAddressProc(get_proc_address);
+      AddGLNativeLibrary(library);
+      SetGLImplementation(kGLImplementationDesktopGL);
+
+      // Initialize GL surface and get some functions needed for the context
+      // creation below.
+      if (!GLSurfaceWGL::InitializeOneOff()) {
+        LOG(ERROR) << "GLSurfaceWGL::InitializeOneOff failed.";
+        return false;
+      }
+      wglCreateContextProc wglCreateContextFn =
+          reinterpret_cast<wglCreateContextProc>(
+              GetGLProcAddress("wglCreateContext"));
+      wglDeleteContextProc wglDeleteContextFn =
+          reinterpret_cast<wglDeleteContextProc>(
+              GetGLProcAddress("wglDeleteContext"));
+      wglMakeCurrentProc wglMakeCurrentFn =
+          reinterpret_cast<wglMakeCurrentProc>(
+              GetGLProcAddress("wglMakeCurrent"));
+
+      // Create a temporary GL context to bind to entry points. This is needed
+      // because wglGetProcAddress is specified to return NULL for all queries
+      // if a context is not current in MSDN documentation, and the static
+      // bindings may contain functions that need to be queried with
+      // wglGetProcAddress. OpenGL wiki further warns that other error values
+      // than NULL could also be returned from wglGetProcAddress on some
+      // implementations, so we need to clear the WGL bindings and reinitialize
+      // them after the context creation.
+      HGLRC gl_context = wglCreateContextFn(GLSurfaceWGL::GetDisplayDC());
+      if (!gl_context) {
+        LOG(ERROR) << "Failed to create temporary context.";
+        return false;
+      }
+      if (!wglMakeCurrentFn(GLSurfaceWGL::GetDisplayDC(), gl_context)) {
+        LOG(ERROR) << "Failed to make temporary GL context current.";
+        wglDeleteContextFn(gl_context);
+        return false;
+      }
+
+      InitializeStaticGLBindingsGL();
+      InitializeStaticGLBindingsWGL();
+
+      wglMakeCurrent(NULL, NULL);
+      wglDeleteContext(gl_context);
+
+      break;
+    }
+    case kGLImplementationMockGL: {
+      SetGLImplementation(kGLImplementationMockGL);
+      InitializeStaticGLBindingsGL();
+      break;
+    }
+    default:
+      return false;
+  }
+
+  return true;
 }
 
 bool InitializeDynamicGLBindings(GLImplementation implementation,
@@ -32,15 +310,35 @@
             new GLContextStubWithExtensions());
         mock_context->SetGLVersionString("3.0");
         InitializeDynamicGLBindingsGL(mock_context.get());
-      } else {
+      } else
         InitializeDynamicGLBindingsGL(context);
-      }
       break;
     default:
       return false;
   }
 
   return true;
+}
+
+void InitializeDebugGLBindings() {
+  InitializeDebugGLBindingsEGL();
+  InitializeDebugGLBindingsGL();
+  InitializeDebugGLBindingsOSMESA();
+  InitializeDebugGLBindingsWGL();
+}
+
+void ClearGLBindings() {
+  // TODO(jmadill): Apply to all platforms eventually
+  if (g_angle_platform_shutdown) {
+    g_angle_platform_shutdown();
+  }
+
+  ClearGLBindingsEGL();
+  ClearGLBindingsGL();
+  ClearGLBindingsOSMESA();
+  ClearGLBindingsWGL();
+  SetGLImplementation(kGLImplementationNone);
+  UnloadGLNativeLibraries();
 }
 
 bool GetGLWindowSystemBindingInfo(GLWindowSystemBindingInfo* info) {