def __init__(self, display: Union[str, int], qml_view: QUrl,
gl_context: QOpenGLContext):
super().__init__()
self.qml_view = qml_view
self.display = display
self.wl_display = Display(display)
self.wl_compositor = None
self.wl_shm = None
self.wl_embedder = None
self.views = {}
self.fd_notifier = None
self.engine = Engine()
self.component = None
self.qml_view = qml_view
self.connected = False
self.gl_context = gl_context
assert gl_context.isOpenGLES()
surface = QOffscreenSurface()
surface.setFormat(gl_context.format())
surface.create()
gl_context.makeCurrent(surface)
def initialize(self, size: QSize, shareContext: QOpenGLContext) -> None:
"""
Initialize offscreen renderer.
Args:
size: The size of the area available for rendering.
shareContext: OpenGL context used as a share context.
Raises:
RuntimeError: If the renderer has already been initialized.
"""
print(f'QmlOffscreenRenderer.initialize: {size}')
if self.initialized:
raise RuntimeError('Already initialized')
context = QOpenGLContext()
context.setShareContext(shareContext)
context.setFormat(get_default_format(gles=False))
context.create()
assert not context.isOpenGLES(), "We need glGetTexImage from OpenGL"
self.size = size
# Create offscreen surface with initialized format
surface = QOffscreenSurface()
surface.setFormat(context.format())
surface.create()
self.ctx = RenderContext(context, surface)
# Set up quick rendering
self._control = control = QQuickRenderControl()
self._window = window = QQuickWindow(control)
self._cursor = self._window.cursor()
# Don't polish/sync/render immediately for better performance, use a timer
self._renderTimer = renderTimer = QTimer()
renderTimer.setSingleShot(True)
renderTimer.setInterval(5)
renderTimer.timeout.connect(self._onRenderTimer)
self._syncTimer = syncTimer = QTimer()
syncTimer.setSingleShot(True)
syncTimer.setInterval(5)
syncTimer.timeout.connect(self._onSyncTimer)
syncTimer.destroyed.connect(self._onSyncTimerDestroyed)
# Request to create frame buffer
window.sceneGraphInitialized.connect(self._onSceneGraphInitialized)
# Request to release frame buffer
window.sceneGraphInvalidated.connect(self._onSceneGraphInvalidated)
# Only render is needed
control.renderRequested.connect(self._onRenderRequested)
# Polish, sync & render
control.sceneChanged.connect(self._onSceneChanged)
self.initialized = True
# Attach root item
self.rootItem.setParentItem(self._window.contentItem())
self._window.contentItem().forceActiveFocus()
self._updateSizes()
self.ctx.makeCurrent()
self._control.initialize(self.ctx.glContext)