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// Copyright (c) 2011 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/gfx/gl/gl_context_egl.h"
#include "build/build_config.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/angle/include/EGL/egl.h"
#include "ui/gfx/gl/egl_util.h"
#include "ui/gfx/gl/gl_surface.h"
// This header must come after the above third-party include, as
// it brings in #defines that cause conflicts.
#include "ui/gfx/gl/gl_bindings.h"
#if defined(USE_X11)
extern "C" {
#include <X11/Xlib.h>
}
#endif
namespace gfx {
std::string GLContextEGL::GetExtensions() {
const char* extensions = eglQueryString(display_,
EGL_EXTENSIONS);
if (!extensions)
return GLContext::GetExtensions();
return GLContext::GetExtensions() + " " + extensions;
}
GLContextEGL::GLContextEGL(GLShareGroup* share_group)
: GLContext(share_group),
context_(NULL)
{
}
GLContextEGL::~GLContextEGL() {
Destroy();
}
bool GLContextEGL::Initialize(
GLSurface* compatible_surface, GpuPreference gpu_preference) {
DCHECK(compatible_surface);
DCHECK(!context_);
static const EGLint kContextAttributes[] = {
EGL_CONTEXT_CLIENT_VERSION, 2,
EGL_NONE
};
display_ = compatible_surface->GetDisplay();
config_ = compatible_surface->GetConfig();
context_ = eglCreateContext(
display_,
config_,
share_group() ? share_group()->GetHandle() : NULL,
kContextAttributes);
if (!context_) {
LOG(ERROR) << "eglCreateContext failed with error "
<< GetLastEGLErrorString();
Destroy();
return false;
}
return true;
}
void GLContextEGL::Destroy() {
if (context_) {
if (!eglDestroyContext(display_, context_)) {
LOG(ERROR) << "eglDestroyContext failed with error "
<< GetLastEGLErrorString();
}
context_ = NULL;
}
}
bool GLContextEGL::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
if (IsCurrent(surface))
return true;
if (!eglMakeCurrent(display_,
surface->GetHandle(),
surface->GetHandle(),
context_)) {
VLOG(1) << "eglMakeCurrent failed with error "
<< GetLastEGLErrorString();
return false;
}
SetCurrent(this, surface);
if (!surface->OnMakeCurrent(this)) {
LOG(ERROR) << "Could not make current.";
return false;
}
return true;
}
void GLContextEGL::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
SetCurrent(NULL, NULL);
eglMakeCurrent(display_,
EGL_NO_SURFACE,
EGL_NO_SURFACE,
EGL_NO_CONTEXT);
}
bool GLContextEGL::IsCurrent(GLSurface* surface) {
DCHECK(context_);
bool native_context_is_current = context_ == eglGetCurrentContext();
// If our context is current then our notion of which GLContext is
// current must be correct. On the other hand, third-party code
// using OpenGL might change the current context.
DCHECK(!native_context_is_current || (GetCurrent() == this));
if (!native_context_is_current)
return false;
if (surface) {
if (surface->GetHandle() != eglGetCurrentSurface(EGL_DRAW))
return false;
}
return true;
}
void* GLContextEGL::GetHandle() {
return context_;
}
void GLContextEGL::SetSwapInterval(int interval) {
DCHECK(IsCurrent(NULL));
if (!eglSwapInterval(display_, interval)) {
LOG(ERROR) << "eglSwapInterval failed with error "
<< GetLastEGLErrorString();
}
}
} // namespace gfx
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