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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qoffscreenintegration_x11.h"
#include <QByteArray>
#include <QOpenGLContext>
#include <X11/Xlib.h>
#include <GL/glx.h>
#include <QtGui/private/qglxconvenience_p.h>
#include <qpa/qplatformsurface.h>
#include <qsurface.h>
QT_BEGIN_NAMESPACE
class QOffscreenX11Info
{
public:
QOffscreenX11Info(QOffscreenX11Connection *connection)
: m_connection(connection)
{
}
Display *display() const {
return (Display *)m_connection->display();
}
Window root() const {
return DefaultRootWindow(display());
}
int screenNumber() const {
return m_connection->screenNumber();
}
private:
QOffscreenX11Connection *m_connection;
};
QOffscreenX11Integration::QOffscreenX11Integration(const QStringList& paramList)
: QOffscreenIntegration(paramList)
{
}
QOffscreenX11Integration::~QOffscreenX11Integration() = default;
bool QOffscreenX11Integration::hasCapability(QPlatformIntegration::Capability cap) const
{
switch (cap) {
case OpenGL: return true;
case ThreadedOpenGL: return true;
case RasterGLSurface: return true;
default: return QOffscreenIntegration::hasCapability(cap);
}
}
#if !defined(QT_NO_OPENGL) && QT_CONFIG(xcb_glx_plugin)
QPlatformOpenGLContext *QOffscreenX11Integration::createPlatformOpenGLContext(QOpenGLContext *context) const
{
auto &connection = nativeInterface()->m_connection;
if (!connection)
connection.reset(new QOffscreenX11Connection);
if (!connection->display())
return nullptr;
return new QOffscreenX11GLXContext(connection->x11Info(), context);
}
#endif // !defined(QT_NO_OPENGL) && QT_CONFIG(xcb_glx_plugin)
QOffscreenX11PlatformNativeInterface *QOffscreenX11Integration::nativeInterface() const
{
if (!m_nativeInterface)
m_nativeInterface.reset(new QOffscreenX11PlatformNativeInterface(const_cast<QOffscreenX11Integration *>(this)));
return static_cast<QOffscreenX11PlatformNativeInterface *>(m_nativeInterface.data());
}
QOffscreenX11PlatformNativeInterface::QOffscreenX11PlatformNativeInterface(QOffscreenIntegration *integration)
:QOffscreenPlatformNativeInterface(integration)
{
}
QOffscreenX11PlatformNativeInterface::~QOffscreenX11PlatformNativeInterface() = default;
void *QOffscreenX11PlatformNativeInterface::nativeResourceForScreen(const QByteArray &resource, QScreen *screen)
{
Q_UNUSED(screen);
if (resource.toLower() == QByteArrayLiteral("display") ) {
if (!m_connection)
m_connection.reset(new QOffscreenX11Connection);
return m_connection->display();
}
return nullptr;
}
#if !defined(QT_NO_OPENGL) && QT_CONFIG(xcb_glx_plugin)
void *QOffscreenX11PlatformNativeInterface::nativeResourceForContext(const QByteArray &resource, QOpenGLContext *context) {
if (resource.toLower() == QByteArrayLiteral("glxconfig") ) {
if (context) {
QOffscreenX11GLXContext *glxPlatformContext = static_cast<QOffscreenX11GLXContext *>(context->handle());
if (glxPlatformContext)
return glxPlatformContext->glxConfig();
}
}
if (resource.toLower() == QByteArrayLiteral("glxcontext") ) {
if (context) {
QOffscreenX11GLXContext *glxPlatformContext = static_cast<QOffscreenX11GLXContext *>(context->handle());
if (glxPlatformContext)
return glxPlatformContext->glxContext();
}
}
return nullptr;
}
#endif
#if QT_CONFIG(xcb)
Display *QOffscreenX11PlatformNativeInterface::display() const
{
return m_connection ? reinterpret_cast<Display *>(m_connection->display()) : nullptr;
}
#endif
QOffscreenX11Connection::QOffscreenX11Connection()
{
XInitThreads();
QByteArray displayName = qgetenv("DISPLAY");
Display *display = XOpenDisplay(displayName.constData());
m_display = display;
m_screenNumber = m_display ? DefaultScreen(m_display) : -1;
}
QOffscreenX11Connection::~QOffscreenX11Connection()
{
if (m_display)
XCloseDisplay((Display *)m_display);
}
QOffscreenX11Info *QOffscreenX11Connection::x11Info()
{
if (!m_x11Info)
m_x11Info.reset(new QOffscreenX11Info(this));
return m_x11Info.data();
}
#if QT_CONFIG(xcb_glx_plugin)
class QOffscreenX11GLXContextData
{
public:
QOffscreenX11Info *x11 = nullptr;
QSurfaceFormat format;
GLXContext context = nullptr;
GLXContext shareContext = nullptr;
GLXFBConfig config = nullptr;
Window window = 0;
};
static Window createDummyWindow(QOffscreenX11Info *x11, XVisualInfo *visualInfo)
{
Colormap cmap = XCreateColormap(x11->display(), x11->root(), visualInfo->visual, AllocNone);
XSetWindowAttributes a;
a.background_pixel = WhitePixel(x11->display(), x11->screenNumber());
a.border_pixel = BlackPixel(x11->display(), x11->screenNumber());
a.colormap = cmap;
Window window = XCreateWindow(x11->display(), x11->root(),
0, 0, 100, 100,
0, visualInfo->depth, InputOutput, visualInfo->visual,
CWBackPixel|CWBorderPixel|CWColormap, &a);
XFreeColormap(x11->display(), cmap);
return window;
}
static Window createDummyWindow(QOffscreenX11Info *x11, GLXFBConfig config)
{
XVisualInfo *visualInfo = glXGetVisualFromFBConfig(x11->display(), config);
if (Q_UNLIKELY(!visualInfo))
qFatal("Could not initialize GLX");
Window window = createDummyWindow(x11, visualInfo);
XFree(visualInfo);
return window;
}
QOffscreenX11GLXContext::QOffscreenX11GLXContext(QOffscreenX11Info *x11, QOpenGLContext *context)
: d(new QOffscreenX11GLXContextData)
{
d->x11 = x11;
d->format = context->format();
if (d->format.renderableType() == QSurfaceFormat::DefaultRenderableType)
d->format.setRenderableType(QSurfaceFormat::OpenGL);
if (d->format.renderableType() != QSurfaceFormat::OpenGL)
return;
d->shareContext = nullptr;
if (context->shareHandle())
d->shareContext = static_cast<QOffscreenX11GLXContext *>(context->shareHandle())->d->context;
GLXFBConfig config = qglx_findConfig(x11->display(), x11->screenNumber(), d->format);
d->config = config;
if (config) {
d->context = glXCreateNewContext(x11->display(), config, GLX_RGBA_TYPE, d->shareContext, true);
if (!d->context && d->shareContext) {
d->shareContext = nullptr;
// re-try without a shared glx context
d->context = glXCreateNewContext(x11->display(), config, GLX_RGBA_TYPE, nullptr, true);
}
// Get the basic surface format details
if (d->context)
qglx_surfaceFormatFromGLXFBConfig(&d->format, x11->display(), config);
// Create a temporary window so that we can make the new context current
d->window = createDummyWindow(x11, config);
} else {
XVisualInfo *visualInfo = qglx_findVisualInfo(x11->display(), 0, &d->format);
if (Q_UNLIKELY(!visualInfo))
qFatal("Could not initialize GLX");
d->context = glXCreateContext(x11->display(), visualInfo, d->shareContext, true);
if (!d->context && d->shareContext) {
// re-try without a shared glx context
d->shareContext = nullptr;
d->context = glXCreateContext(x11->display(), visualInfo, nullptr, true);
}
d->window = createDummyWindow(x11, visualInfo);
XFree(visualInfo);
}
}
QOffscreenX11GLXContext::~QOffscreenX11GLXContext()
{
glXDestroyContext(d->x11->display(), d->context);
XDestroyWindow(d->x11->display(), d->window);
}
bool QOffscreenX11GLXContext::makeCurrent(QPlatformSurface *surface)
{
QSize size = surface->surface()->size();
XResizeWindow(d->x11->display(), d->window, size.width(), size.height());
XSync(d->x11->display(), true);
if (glXMakeCurrent(d->x11->display(), d->window, d->context)) {
glViewport(0, 0, size.width(), size.height());
return true;
}
return false;
}
void QOffscreenX11GLXContext::doneCurrent()
{
glXMakeCurrent(d->x11->display(), 0, nullptr);
}
void QOffscreenX11GLXContext::swapBuffers(QPlatformSurface *)
{
}
QFunctionPointer QOffscreenX11GLXContext::getProcAddress(const char *procName)
{
return (QFunctionPointer)glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(procName));
}
QSurfaceFormat QOffscreenX11GLXContext::format() const
{
return d->format;
}
bool QOffscreenX11GLXContext::isSharing() const
{
return d->shareContext;
}
bool QOffscreenX11GLXContext::isValid() const
{
return d->context && d->window;
}
GLXContext QOffscreenX11GLXContext::glxContext() const
{
return d->context;
}
void *QOffscreenX11GLXContext::glxConfig() const
{
return d->config;
}
#endif // QT_CONFIG(xcb_glx_plugin)
QT_END_NAMESPACE
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