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# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
from __future__ import annotations
from PySide6.QtOpenGLWidgets import QOpenGLWidget
from PySide6.QtCore import QMutexLocker, QSize, QThread, Slot, Signal
from renderer import Renderer
class GLWidget(QOpenGLWidget):
render_requested = Signal()
def __init__(self, parent=None):
super().__init__(parent)
self.aboutToCompose.connect(self.on_about_to_compose)
self.frameSwapped.connect(self.on_frame_swapped)
self.aboutToResize.connect(self.on_about_to_resize)
self.resized.connect(self.on_resized)
self._thread = QThread()
self._renderer = Renderer(self)
self._renderer.moveToThread(self._thread)
self._thread.finished.connect(self._renderer.deleteLater)
self.render_requested.connect(self._renderer.render)
self._renderer.context_wanted.connect(self.grab_context)
self._thread.start()
def stop_rendering(self):
self._renderer.prepare_exit()
self._thread.quit()
self._thread.wait()
self._thread = None
self._renderer = None
def closeEvent(self, event):
self.stop_rendering()
event.accept()
def paintEvent(self, event):
pass
def sizeHint(self):
return QSize(200, 200)
@Slot()
def on_about_to_compose(self):
# We are on the gui thread here. Composition is about to
# begin. Wait until the render thread finishes.
self._renderer.lock_renderer()
@Slot()
def on_frame_swapped(self):
self._renderer.unlock_renderer()
# Assuming a blocking swap, our animation is driven purely by the
# vsync in self example.
self.render_requested.emit()
@Slot()
def on_about_to_resize(self):
self._renderer.lock_renderer()
@Slot()
def on_resized(self):
self._renderer.unlock_renderer()
@Slot()
def grab_context(self):
if not self._renderer:
return
self._renderer.lock_renderer()
with QMutexLocker(self._renderer.grab_mutex()):
self.context().moveToThread(self._thread)
self._renderer.grab_condition().wakeAll()
self._renderer.unlock_renderer()
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