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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.
extern "C" {
#include <X11/Xlib.h>
}
#include "ui/gfx/gl/gl_context_glx.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/mesa/MesaLib/include/GL/osmesa.h"
#include "ui/gfx/gl/gl_bindings.h"
#include "ui/gfx/gl/gl_implementation.h"
#include "ui/gfx/gl/gl_surface_glx.h"
namespace gfx {
namespace {
// scoped_ptr functor for XFree(). Use as follows:
// scoped_ptr_malloc<XVisualInfo, ScopedPtrXFree> foo(...);
// where "XVisualInfo" is any X type that is freed with XFree.
class ScopedPtrXFree {
public:
void operator()(void* x) const {
::XFree(x);
}
};
bool IsCompositingWindowManagerActive(Display* display) {
// The X macro "None" has been undefined by gl_bindings.h.
const int kNone = 0;
static Atom net_wm_cm_s0 = kNone;
if (net_wm_cm_s0 == kNone) {
net_wm_cm_s0 = XInternAtom(display, "_NET_WM_CM_S0", True);
}
if (net_wm_cm_s0 == kNone) {
return false;
}
return XGetSelectionOwner(display, net_wm_cm_s0) != kNone;
}
} // namespace anonymous
GLContextGLX::GLContextGLX(GLShareGroup* share_group)
: GLContext(share_group),
context_(NULL) {
}
GLContextGLX::~GLContextGLX() {
Destroy();
}
bool GLContextGLX::Initialize(GLSurface* compatible_surface) {
GLSurfaceGLX* surface_glx = static_cast<GLSurfaceGLX*>(compatible_surface);
GLXFBConfig config = static_cast<GLXFBConfig>(surface_glx->GetConfig());
GLXContext share_handle = static_cast<GLXContext>(
share_group() ? share_group()->GetHandle() : NULL);
// The means by which the context is created depends on whether the drawable
// type works reliably with GLX 1.3. If it does not then fall back to GLX 1.2.
if (config) {
context_ = glXCreateNewContext(
GLSurfaceGLX::GetDisplay(),
static_cast<GLXFBConfig>(surface_glx->GetConfig()),
GLX_RGBA_TYPE,
share_handle,
True);
} else {
Display* display = GLSurfaceGLX::GetDisplay();
// Get the visuals for the X drawable.
XWindowAttributes attributes;
XGetWindowAttributes(
display,
reinterpret_cast<GLXDrawable>(surface_glx->GetHandle()),
&attributes);
XVisualInfo visual_info_template;
visual_info_template.visualid = XVisualIDFromVisual(attributes.visual);
int visual_info_count = 0;
scoped_ptr_malloc<XVisualInfo, ScopedPtrXFree> visual_info_list(
XGetVisualInfo(display, VisualIDMask,
&visual_info_template,
&visual_info_count));
DCHECK(visual_info_list.get());
if (visual_info_count == 0) {
LOG(ERROR) << "No visual info for visual ID.";
return false;
}
// Attempt to create a context with each visual in turn until one works.
context_ = glXCreateContext(
display,
visual_info_list.get(),
share_handle,
True);
}
if (!context_) {
LOG(ERROR) << "Couldn't create GL context.";
Destroy();
return false;
}
return true;
}
void GLContextGLX::Destroy() {
if (context_) {
glXDestroyContext(GLSurfaceGLX::GetDisplay(),
static_cast<GLXContext>(context_));
context_ = NULL;
}
}
bool GLContextGLX::MakeCurrent(GLSurface* surface) {
DCHECK(context_);
if (IsCurrent(surface))
return true;
GLSurfaceGLX* surface_glx = static_cast<GLSurfaceGLX*>(surface);
if (!glXMakeCurrent(
GLSurfaceGLX::GetDisplay(),
reinterpret_cast<GLXDrawable>(surface->GetHandle()),
static_cast<GLXContext>(context_))) {
LOG(ERROR) << "Couldn't make context current with X drawable.";
Destroy();
return false;
}
return true;
}
void GLContextGLX::ReleaseCurrent(GLSurface* surface) {
if (!IsCurrent(surface))
return;
glXMakeContextCurrent(GLSurfaceGLX::GetDisplay(), 0, 0, NULL);
}
bool GLContextGLX::IsCurrent(GLSurface* surface) {
if (glXGetCurrentContext() != static_cast<GLXContext>(context_))
return false;
if (surface) {
if (glXGetCurrentDrawable() !=
reinterpret_cast<GLXDrawable>(surface->GetHandle())) {
return false;
}
}
return true;
}
void* GLContextGLX::GetHandle() {
return context_;
}
void GLContextGLX::SetSwapInterval(int interval) {
DCHECK(IsCurrent(NULL));
if (HasExtension("GLX_EXT_swap_control") && glXSwapIntervalEXT) {
// Only enable vsync if we aren't using a compositing window
// manager. At the moment, compositing window managers don't
// respect this setting anyway (tearing still occurs) and it
// dramatically increases latency.
if (interval == 1 &&
IsCompositingWindowManagerActive(GLSurfaceGLX::GetDisplay())) {
LOG(INFO) <<
"Forcing vsync off because compositing window manager was detected.";
interval = 0;
}
glXSwapIntervalEXT(
GLSurfaceGLX::GetDisplay(),
glXGetCurrentDrawable(),
interval);
} else {
if(interval == 0)
LOG(WARNING) <<
"Could not disable vsync: driver does not "
"support GLX_EXT_swap_control";
}
}
std::string GLContextGLX::GetExtensions() {
DCHECK(IsCurrent(NULL));
const char* extensions = glXQueryExtensionsString(
GLSurfaceGLX::GetDisplay(),
0);
if (extensions) {
return GLContext::GetExtensions() + " " + extensions;
}
return GLContext::GetExtensions();
}
} // namespace gfx
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