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

ui/gl/init/gl_initializer_x11.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/command_line.h"
 #include "base/logging.h"
-#include "ui/gl/gl_implementation.h"
+#include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
+#include "build/build_config.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_glx_api_implementation.h"
+#include "ui/gl/gl_implementation_osmesa.h"
+#include "ui/gl/gl_osmesa_api_implementation.h"
 #include "ui/gl/gl_surface_egl.h"
 #include "ui/gl/gl_surface_glx.h"
 #include "ui/gl/gl_surface_osmesa_x11.h"
+#include "ui/gl/gl_switches.h"
 
 namespace gl {
 namespace init {
 
+namespace {
+
+#if defined(OS_OPENBSD)
+const char kGLLibraryName[] = "libGL.so";
+#else
+const char kGLLibraryName[] = "libGL.so.1";
+#endif
+
+const char kGLESv2LibraryName[] = "libGLESv2.so.2";
+const char kEGLLibraryName[] = "libEGL.so.1";
+
+const char kGLESv2ANGLELibraryName[] = "libGLESv2.so";
+const char kEGLANGLELibraryName[] = "libEGL.so";
+
+// TODO(piman): it should be Desktop GL marshalling from double to float. Today
+// on native GLES, we do float->double->float.
+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 InitializeStaticGLXInternal() {
+  base::NativeLibrary library = NULL;
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
+
+  if (command_line->HasSwitch(switches::kTestGLLib))
+    library = LoadLibraryAndPrintError(
+        command_line->GetSwitchValueASCII(switches::kTestGLLib).c_str());
+
+  if (!library) {
+    library = LoadLibraryAndPrintError(kGLLibraryName);
+  }
+
+  if (!library)
+    return false;
+
+  GLGetProcAddressProc get_proc_address =
+      reinterpret_cast<GLGetProcAddressProc>(
+          base::GetFunctionPointerFromNativeLibrary(library,
+                                                    "glXGetProcAddress"));
+  if (!get_proc_address) {
+    LOG(ERROR) << "glxGetProcAddress not found.";
+    base::UnloadNativeLibrary(library);
+    return false;
+  }
+
+  SetGLGetProcAddressProc(get_proc_address);
+  AddGLNativeLibrary(library);
+  SetGLImplementation(kGLImplementationDesktopGL);
+
+  InitializeStaticGLBindingsGL();
+  InitializeStaticGLBindingsGLX();
+
+  return true;
+}
+
+bool InitializeStaticEGLInternal() {
+  base::FilePath glesv2_path(kGLESv2LibraryName);
+  base::FilePath egl_path(kEGLLibraryName);
+
+  const base::CommandLine* command_line =
+      base::CommandLine::ForCurrentProcess();
+  if (command_line->GetSwitchValueASCII(switches::kUseGL) ==
+      kGLImplementationANGLEName) {
+    base::FilePath module_path;
+    if (!PathService::Get(base::DIR_MODULE, &module_path))
+      return false;
+
+    glesv2_path = module_path.Append(kGLESv2ANGLELibraryName);
+    egl_path = module_path.Append(kEGLANGLELibraryName);
+  }
+
+  base::NativeLibrary gles_library = LoadLibraryAndPrintError(glesv2_path);
+  if (!gles_library)
+    return false;
+  base::NativeLibrary egl_library = LoadLibraryAndPrintError(egl_path);
+  if (!egl_library) {
+    base::UnloadNativeLibrary(gles_library);
+    return false;
+  }
+
+  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;
+}
+
+}  // namespace
+
 bool InitializeGLOneOffPlatform() {
   switch (GetGLImplementation()) {
     case kGLImplementationDesktopGL:
       if (!GLSurfaceGLX::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceGLX::InitializeOneOff failed.";
         return false;
       }
       return true;
     case kGLImplementationOSMesaGL:
       if (!GLSurfaceOSMesaX11::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceOSMesaX11::InitializeOneOff failed.";
         return false;
       }
       return true;
     case kGLImplementationEGLGLES2:
       if (!GLSurfaceEGL::InitializeOneOff()) {
         LOG(ERROR) << "GLSurfaceEGL::InitializeOneOff failed.";
         return false;
       }
       return true;
     default:
       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 InitializeStaticGLBindingsOSMesaGL();
+    case kGLImplementationDesktopGL:
+      return InitializeStaticGLXInternal();
+    case kGLImplementationEGLGLES2:
+      return InitializeStaticEGLInternal();
+    case kGLImplementationMockGL:
+      SetGLImplementation(kGLImplementationMockGL);
+      InitializeStaticGLBindingsGL();
+      return true;
+    default:
+      NOTREACHED();
+  }
+
+  return false;
+}
+
+void InitializeDebugGLBindings() {
+  InitializeDebugGLBindingsEGL();
+  InitializeDebugGLBindingsGL();
+  InitializeDebugGLBindingsGLX();
+  InitializeDebugGLBindingsOSMESA();
+}
+
+void ClearGLBindingsPlatform() {
+  ClearGLBindingsEGL();
+  ClearGLBindingsGL();
+  ClearGLBindingsGLX();
+  ClearGLBindingsOSMESA();
+}
+
 }  // namespace init
 }  // namespace gl