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// 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 <OpenGL/CGLRenderers.h>
#include <vector>
#include "base/base_paths.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/mac/bundle_locations.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_context.h"
#include "ui/gl/gl_display.h"
#include "ui/gl/gl_gl_api_implementation.h"
#include "ui/gl/gl_implementation.h"
#include "ui/gl/gl_surface.h"
#include "ui/gl/gl_utils.h"
#include "ui/gl/gpu_switching_manager.h"
#if defined(USE_EGL)
#include "ui/gl/gl_egl_api_implementation.h"
#endif // defined(USE_EGL)
namespace gl {
namespace init {
namespace {
const char kOpenGLFrameworkPath[] =
"/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL";
bool InitializeOneOffForSandbox() {
static bool initialized = false;
if (initialized)
return true;
// This is called from the sandbox warmup code on Mac OS X.
// GPU-related stuff is very slow without this, probably because
// the sandbox prevents loading graphics drivers or some such.
std::vector<CGLPixelFormatAttribute> attribs;
if (GLContext::SwitchableGPUsSupported()) {
// Avoid switching to the discrete GPU just for this pixel
// format selection.
attribs.push_back(kCGLPFAAllowOfflineRenderers);
}
attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
CGLPixelFormatObj format;
GLint num_pixel_formats;
if (CGLChoosePixelFormat(&attribs.front(), &format, &num_pixel_formats) !=
kCGLNoError) {
LOG(ERROR) << "Error choosing pixel format.";
return false;
}
if (!format) {
LOG(ERROR) << "format == 0.";
return false;
}
CGLReleasePixelFormat(format);
DCHECK_NE(num_pixel_formats, 0);
initialized = true;
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;
}
#if defined(USE_EGL)
const char kGLESv2ANGLELibraryName[] = "libGLESv2.dylib";
const char kEGLANGLELibraryName[] = "libEGL.dylib";
bool InitializeStaticEGLInternalFromLibrary(GLImplementation implementation) {
#if BUILDFLAG(USE_STATIC_ANGLE)
NOTREACHED();
#endif
// Some unit test targets depend on Angle/SwiftShader but aren't built
// as app bundles. In that case, the .dylib is next to the executable.
base::FilePath base_dir;
if (base::mac::AmIBundled()) {
base_dir = base::mac::FrameworkBundlePath().Append("Libraries");
} else {
if (!base::PathService::Get(base::FILE_EXE, &base_dir)) {
LOG(ERROR) << "PathService::Get failed.";
return false;
}
base_dir = base_dir.DirName();
}
base::FilePath glesv2_path = base_dir.Append(kGLESv2ANGLELibraryName);
base::NativeLibrary gles_library = LoadLibraryAndPrintError(glesv2_path);
if (!gles_library) {
return false;
}
base::FilePath egl_path = base_dir.Append(kEGLANGLELibraryName);
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);
// FIXME: SwiftShader must load symbols from libGLESv2 before libEGL on MacOS
// currently
AddGLNativeLibrary(gles_library);
AddGLNativeLibrary(egl_library);
return true;
}
bool InitializeStaticEGLInternal(GLImplementationParts implementation) {
#if BUILDFLAG(USE_STATIC_ANGLE)
if (implementation.gl == kGLImplementationEGLANGLE) {
// Use ANGLE if it is requested and it is statically linked
if (!InitializeStaticANGLEEGL())
return false;
} else if (!InitializeStaticEGLInternalFromLibrary(implementation.gl)) {
return false;
}
#else
if (!InitializeStaticEGLInternalFromLibrary(implementation.gl)) {
return false;
}
#endif // !BUILDFLAG(USE_STATIC_ANGLE)
SetGLImplementationParts(implementation);
InitializeStaticGLBindingsGL();
InitializeStaticGLBindingsEGL();
return true;
}
#endif // defined(USE_EGL)
} // namespace
GLDisplay* InitializeGLOneOffPlatform(uint64_t system_device_id) {
GLDisplayEGL* display = GetDisplayEGL(system_device_id);
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
case kGLImplementationDesktopGLCoreProfile:
if (!InitializeOneOffForSandbox()) {
LOG(ERROR) << "GLSurfaceCGL::InitializeOneOff failed.";
}
break;
#if defined(USE_EGL)
case kGLImplementationEGLGLES2:
case kGLImplementationEGLANGLE:
if (!display->Initialize(EGLDisplayPlatform(0))) {
LOG(ERROR) << "GLDisplayEGL::Initialize failed.";
return nullptr;
}
break;
#endif // defined(USE_EGL)
default:
break;
}
return display;
}
bool InitializeStaticGLBindings(GLImplementationParts 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.gl) {
case kGLImplementationDesktopGL:
case kGLImplementationDesktopGLCoreProfile:
return InitializeStaticCGLInternal(implementation.gl);
#if defined(USE_EGL)
case kGLImplementationEGLGLES2:
case kGLImplementationEGLANGLE:
return InitializeStaticEGLInternal(implementation);
#endif // #if defined(USE_EGL)
case kGLImplementationMockGL:
case kGLImplementationStubGL:
SetGLImplementationParts(implementation);
InitializeStaticGLBindingsGL();
return true;
default:
NOTREACHED();
}
return false;
}
void ShutdownGLPlatform(GLDisplay* display) {
ClearBindingsGL();
#if defined(USE_EGL)
if (display)
display->Shutdown();
ClearBindingsEGL();
#endif // defined(USE_EGL)
}
} // namespace init
} // namespace gl
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