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

ui/gl/init/gl_initializer_win.cc

 // Copyright 2016 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 "ui/gl/init/gl_initializer.h"
 
+#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 "ui/gl/gl_implementation.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_egl_api_implementation.h"
+#include "ui/gl/gl_gl_api_implementation.h"
+#include "ui/gl/gl_osmesa_api_implementation.h"
 #include "ui/gl/gl_surface_egl.h"
 #include "ui/gl/gl_surface_wgl.h"
+#include "ui/gl/gl_wgl_api_implementation.h"
 #include "ui/gl/vsync_provider_win.h"
 
+#if defined(ENABLE_SWIFTSHADER)
+#include "software_renderer.h"
+#endif
+
 namespace gl {
 namespace init {
 
+namespace {
+
+const wchar_t kD3DCompiler[] = L"D3DCompiler_47.dll";
+
+// TODO(jmadill): Apply to all platforms eventually
+base::LazyInstance<ANGLEPlatformImpl> g_angle_platform_impl =
+    LAZY_INSTANCE_INITIALIZER;
+
+ANGLEPlatformShutdownFunc g_angle_platform_shutdown = nullptr;
+
+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), nullptr);
+  if (!library) {
+    library = base::LoadNativeLibrary(module_path.Append(name), nullptr);
+    if (!library) {
+      DVLOG(1) << name << " not found.";
+      return false;
+    }
+  }
+  return true;
+}
+
+bool InitializeStaticOSMesaInternal() {
+  base::FilePath module_path;
+  PathService::Get(base::DIR_MODULE, &module_path);
+  base::NativeLibrary library =
+      base::LoadNativeLibrary(module_path.Append(L"osmesa.dll"), nullptr);
+  if (!library) {
+    PathService::Get(base::DIR_EXE, &module_path);
+    library =
+        base::LoadNativeLibrary(module_path.Append(L"osmesa.dll"), nullptr);
+    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();
+
+  return true;
+}
+
+bool InitializeStaticEGLInternal() {
+  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"), nullptr);
+  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"), nullptr);
+  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;
+  return true;
+}
+
+bool InitializeStaticWGLInternal() {
+  base::NativeLibrary library =
+      base::LoadNativeLibrary(base::FilePath(L"opengl32.dll"), nullptr);
+  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 nullptr 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 nullptr 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(nullptr, nullptr);
+  wglDeleteContext(gl_context);
+
+  return true;
+}
+
+}  // namespace
+
 bool InitializeGLOneOffPlatform() {
   VSyncProviderWin::InitializeOneOff();
 
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
       if (!GLSurfaceWGL::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceWGL::InitializeOneOff failed.";
         return false;
       }
       break;
     case kGLImplementationEGLGLES2:
       if (!GLSurfaceEGL::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
         return false;
       }
       break;
     case kGLImplementationOSMesaGL:
     case kGLImplementationMockGL:
       break;
     default:
       NOTREACHED();
   }
   return true;
 }
 
+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 kGLImplementationEGLGLES2:
+      return InitializeStaticEGLInternal();
+    case kGLImplementationDesktopGL:
+      return InitializeStaticWGLInternal();
+    case kGLImplementationMockGL:
+      SetGLImplementation(kGLImplementationMockGL);
+      InitializeStaticGLBindingsGL();
+      return true;
+    default:
+      NOTREACHED();
+  }
+
+  return false;
+}
+
+void InitializeDebugGLBindings() {
+  InitializeDebugGLBindingsEGL();
+  InitializeDebugGLBindingsGL();
+  InitializeDebugGLBindingsOSMESA();
+  InitializeDebugGLBindingsWGL();
+}
+
+void ClearGLBindingsPlatform() {
+  // TODO(jmadill): Apply to all platforms eventually
+  if (g_angle_platform_shutdown) {
+    g_angle_platform_shutdown();
+  }
+
+  ClearGLBindingsEGL();
+  ClearGLBindingsGL();
+  ClearGLBindingsOSMESA();
+  ClearGLBindingsWGL();
+}
+
 }  // namespace init
 }  // namespace gl