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#############################################################################
##
## Copyright (C) 2022 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the Qt for Python examples of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of The Qt Company Ltd nor the names of its
## contributors may be used to endorse or promote products derived
## from this software without specific prior written permission.
##
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
##
## $QT_END_LICENSE$
##
#############################################################################
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()
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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