XVisualInfo *qglx_findVisualInfo(Display *display, int screen, QSurfaceFormat *format)
{
Q_ASSERT(format);
XVisualInfo *visualInfo = 0;
GLXFBConfig config = qglx_findConfig(display,screen,*format);
if (config) {
visualInfo = glXGetVisualFromFBConfig(display, config);
*format = qglx_surfaceFormatFromGLXFBConfig(display, config);
}
// attempt to fall back to glXChooseVisual
bool reduced = true;
QSurfaceFormat reducedFormat = *format;
while (!visualInfo && reduced) {
QVarLengthArray<int, 13> attribs;
attribs.append(GLX_RGBA);
if (reducedFormat.redBufferSize() > 0) {
attribs.append(GLX_RED_SIZE);
attribs.append(reducedFormat.redBufferSize());
}
if (reducedFormat.greenBufferSize() > 0) {
attribs.append(GLX_GREEN_SIZE);
attribs.append(reducedFormat.greenBufferSize());
}
if (reducedFormat.blueBufferSize() > 0) {
attribs.append(GLX_BLUE_SIZE);
attribs.append(reducedFormat.blueBufferSize());
}
if (reducedFormat.stencilBufferSize() > 0) {
attribs.append(GLX_STENCIL_SIZE);
attribs.append(reducedFormat.stencilBufferSize());
}
if (reducedFormat.depthBufferSize() > 0) {
attribs.append(GLX_DEPTH_SIZE);
attribs.append(reducedFormat.depthBufferSize());
}
if (reducedFormat.swapBehavior() != QSurfaceFormat::SingleBuffer)
attribs.append(GLX_DOUBLEBUFFER);
attribs.append(XNone);
visualInfo = glXChooseVisual(display, screen, attribs.data());
if (visualInfo)
*format = reducedFormat;
reducedFormat = qglx_reduceSurfaceFormat(reducedFormat, &reduced);
}
return visualInfo;
}
QT_BEGIN_NAMESPACE
QWaylandXCompositeGLXContext::QWaylandXCompositeGLXContext(const QSurfaceFormat &format, QPlatformOpenGLContext *share, Display *display, int screen)
: m_display(display)
{
qDebug("creating XComposite-GLX context");
GLXContext shareContext = share ? static_cast<QWaylandXCompositeGLXContext *>(share)->m_context : 0;
GLXFBConfig config = qglx_findConfig(display, screen, format, GLX_WINDOW_BIT | GLX_PIXMAP_BIT);
XVisualInfo *visualInfo = glXGetVisualFromFBConfig(display, config);
m_context = glXCreateContext(display, visualInfo, shareContext, true);
qglx_surfaceFormatFromGLXFBConfig(&m_format, display, config, m_context);
}
QOffscreenX11GLXContext::QOffscreenX11GLXContext(QOffscreenX11Info *x11, QOpenGLContext *context)
: d(new QOffscreenX11GLXContextData)
{
d->x11 = x11;
d->format = context->format();
d->shareContext = 0;
if (context->shareHandle())
d->shareContext = static_cast<QOffscreenX11GLXContext *>(context->shareHandle())->d->context;
GLXFBConfig config = qglx_findConfig(x11->display(), x11->screenNumber(), d->format);
if (config) {
d->context = glXCreateNewContext(x11->display(), config, GLX_RGBA_TYPE, d->shareContext, true);
if (!d->context && d->shareContext) {
d->shareContext = 0;
// re-try without a shared glx context
d->context = glXCreateNewContext(x11->display(), config, GLX_RGBA_TYPE, 0, 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 (!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 = 0;
d->context = glXCreateContext(x11->display(), visualInfo, 0, true);
}
d->window = createDummyWindow(x11, visualInfo);
XFree(visualInfo);
}
}
