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// Copyright (c) 2012 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 <string>
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/threading/thread_local.h"
#include "ui/gfx/gl/gl_context.h"
#include "ui/gfx/gl/gl_bindings.h"
#include "ui/gfx/gl/gl_implementation.h"
#include "ui/gfx/gl/gl_surface.h"
#include "ui/gfx/gl/gl_switches.h"
namespace gfx {
namespace {
base::LazyInstance<base::ThreadLocalPointer<GLContext> >::Leaky
current_context_ = LAZY_INSTANCE_INITIALIZER;
} // namespace
GLContext::GLContext(GLShareGroup* share_group) : share_group_(share_group) {
if (!share_group_.get())
share_group_ = new GLShareGroup;
share_group_->AddContext(this);
}
GLContext::~GLContext() {
share_group_->RemoveContext(this);
if (GetCurrent() == this) {
SetCurrent(NULL, NULL);
}
}
std::string GLContext::GetExtensions() {
DCHECK(IsCurrent(NULL));
std::string extensions;
if (GLSurface::GetCurrent()) {
extensions = GLSurface::GetCurrent()->GetExtensions();
}
const char* gl_ext = reinterpret_cast<const char*>(
glGetString(GL_EXTENSIONS));
if (gl_ext) {
extensions += (!extensions.empty() && gl_ext[0]) ? " " : "";
extensions += gl_ext;
}
return extensions;
}
bool GLContext::HasExtension(const char* name) {
std::string extensions = GetExtensions();
extensions += " ";
std::string delimited_name(name);
delimited_name += " ";
return extensions.find(delimited_name) != std::string::npos;
}
GLShareGroup* GLContext::share_group() {
return share_group_.get();
}
bool GLContext::LosesAllContextsOnContextLost() {
switch (GetGLImplementation()) {
case kGLImplementationDesktopGL:
return false;
case kGLImplementationEGLGLES2:
return true;
case kGLImplementationOSMesaGL:
case kGLImplementationAppleGL:
return false;
case kGLImplementationMockGL:
return false;
default:
NOTREACHED();
return true;
}
}
GLContext* GLContext::GetCurrent() {
return current_context_.Pointer()->Get();
}
void GLContext::SetCurrent(GLContext* context, GLSurface* surface) {
current_context_.Pointer()->Set(context);
GLSurface::SetCurrent(surface);
}
bool GLContext::WasAllocatedUsingARBRobustness() {
return false;
}
bool GLContext::InitializeExtensionBindings() {
DCHECK(IsCurrent(NULL));
static bool initialized = false;
if (initialized)
return initialized;
initialized = InitializeGLExtensionBindings(GetGLImplementation(), this);
if (!initialized)
LOG(ERROR) << "Could not initialize extension bindings.";
return initialized;
}
} // namespace gfx
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