diff options
Diffstat (limited to 'examples/opengl/contextinfo.py')
| -rw-r--r-- | examples/opengl/contextinfo.py | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/examples/opengl/contextinfo.py b/examples/opengl/contextinfo.py new file mode 100644 index 000000000..b2df1ded2 --- /dev/null +++ b/examples/opengl/contextinfo.py @@ -0,0 +1,251 @@ +#!/usr/bin/env python + +############################################################################# +## +## Copyright (C) 2017 The Qt Company Ltd. +## Contact: http://www.qt.io/licensing/ +## +## This file is part of the PySide 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." +## +## $QT_END_LICENSE$ +## +############################################################################# + +"""PySide2 port of the opengl/contextinfo example from Qt v5.x""" + +import numpy +import sys + +from PySide2.QtCore import QLibraryInfo, QSize, QTimer, Qt +from PySide2.QtGui import (QMatrix4x4, QOpenGLBuffer, QOpenGLContext, QOpenGLShader, + QOpenGLShaderProgram, QOpenGLVertexArrayObject, QSurfaceFormat, QWindow) +from PySide2.QtWidgets import (QApplication, QHBoxLayout, QMessageBox, QPlainTextEdit, + QWidget) +from PySide2.support import VoidPtr +try: + from OpenGL import GL +except ImportError: + app = QApplication(sys.argv) + messageBox = QMessageBox(QMessageBox.Critical, "ContextInfo", + "PyOpenGL must be installed to run this example.", + QMessageBox.Close) + messageBox.setDetailedText("Run:\npip install PyOpenGL PyOpenGL_accelerate") + messageBox.exec_() + sys.exit(1) + +vertexShaderSource110 = """ +#version 110 +attribute highp vec4 posAttr; +attribute lowp vec4 colAttr; +varying lowp vec4 col; +uniform highp mat4 matrix; +void main() { + col = colAttr; + gl_Position = matrix * posAttr; +} +""" + +fragmentShaderSource110 = """ +#version 110 +varying lowp vec4 col; +void main() { + gl_FragColor = col; +} +""" + +vertexShaderSource = """ +#version 150 +in vec4 posAttr; +in vec4 colAttr; +out vec4 col; +uniform mat4 matrix; +void main() { + col = colAttr; + gl_Position = matrix * posAttr; +} +""" + +fragmentShaderSource = """ +#version 150 +in vec4 col; +out vec4 fragColor; +void main() { + fragColor = col; +} +""" + +vertices = numpy.array([0, 0.707, -0.5, -0.5, 0.5, -0.5], dtype = numpy.float32) +colors = numpy.array([1, 0, 0, 0, 1, 0, 0, 0, 1], dtype = numpy.float32) + +class RenderWindow(QWindow): + def __init__(self, format): + super(RenderWindow, self).__init__() + self.setSurfaceType(QWindow.OpenGLSurface); + self.setFormat(format); + self.context = QOpenGLContext(self); + self.context.setFormat(self.requestedFormat()); + if not self.context.create(): + raise Exception("Unable to create GL context") + self.program = None + self.timer = None + self.angle = 0 + + def initGl(self): + self.program = QOpenGLShaderProgram(self); + self.vao = QOpenGLVertexArrayObject() + self.vbo = QOpenGLBuffer() + + format = self.context.format(); + useNewStyleShader = format.profile() == QSurfaceFormat.CoreProfile; + # Try to handle 3.0 & 3.1 that do not have the core/compatibility profile + # concept 3.2+ has. This may still fail since version 150 (3.2) is + # specified in the sources but it's worth a try. + if (format.renderableType() == QSurfaceFormat.OpenGL and format.majorVersion() == 3 + and format.minorVersion() <= 1): + useNewStyleShader = not format.testOption(QSurfaceFormat.DeprecatedFunctions) + + vertexShader = vertexShaderSource if useNewStyleShader else vertexShaderSource110 + fragmentShader = fragmentShaderSource if useNewStyleShader else fragmentShaderSource110 + if not self.program.addShaderFromSourceCode(QOpenGLShader.Vertex, vertexShader): + raise Exception("Vertex shader could not be added: {} ({})".format(self.program.log(), vertexShader)) + if not self.program.addShaderFromSourceCode(QOpenGLShader.Fragment, fragmentShader): + raise Exception("Fragment shader could not be added: {} ({})".format(self.program.log(), fragmentShader)) + if not self.program.link(): + raise Exception("Could not link shaders: {}".format(self.program.log())) + + self.posAttr = self.program.attributeLocation("posAttr"); + self.colAttr = self.program.attributeLocation("colAttr"); + self.matrixUniform = self.program.uniformLocation("matrix"); + + self.vbo.create(); + self.vbo.bind(); + self.verticesData = vertices.tobytes() + self.colorsData = colors.tobytes() + verticesSize = 4 * vertices.size + colorsSize = 4 * colors.size + self.vbo.allocate(VoidPtr(self.verticesData), verticesSize + colorsSize); + self.vbo.write(verticesSize, VoidPtr(self.colorsData), colorsSize) + self.vbo.release(); + + vaoBinder = QOpenGLVertexArrayObject.Binder(self.vao) + if self.vao.isCreated(): # have VAO support, use it + self.setupVertexAttribs() + + def setupVertexAttribs(self): + self.vbo.bind(); + self.program.setAttributeBuffer(self.posAttr, GL.GL_FLOAT, 0, 2); + self.program.setAttributeBuffer(self.colAttr, GL.GL_FLOAT, 4 * vertices.size, 3); + self.program.enableAttributeArray(self.posAttr); + self.program.enableAttributeArray(self.colAttr); + self.vbo.release(); + + def exposeEvent(self, event): + if self.isExposed(): + self.render() + if self.timer is None: + self.timer = QTimer(self) + self.timer.timeout.connect(self.slotTimer) + self.timer.start(10) + + def render(self): + if not self.context.makeCurrent(self): + raise Exception("makeCurrent() failed") + functions = self.context.functions() + if self.program is None: + functions.glEnable(GL.GL_DEPTH_TEST) + functions.glClearColor(0, 0, 0, 1) + self.initGl() + + functions.glViewport(0, 0, self.width(), self.height()); + functions.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); + + self.program.bind(); + matrix = QMatrix4x4() + matrix.perspective(60, 4 / 3, 0.1, 100) + matrix.translate(0, 0, -2) + matrix.rotate(self.angle, 0, 1, 0) + self.program.setUniformValue(self.matrixUniform, matrix); + + if self.vao.isCreated(): + self.vao.bind(); + else: # no VAO support, set the vertex attribute arrays now + self.setupVertexAttribs() + + functions.glDrawArrays(GL.GL_TRIANGLES, 0, 3); + + self.vao.release() + self.program.release() + + # swapInterval is 1 by default which means that swapBuffers() will (hopefully) block + # and wait for vsync. + self.context.swapBuffers(self) + self.context.doneCurrent() + + def slotTimer(self): + self.render() + self.angle += 1 + + def glInfo(self): + if not self.context.makeCurrent(self): + raise Exception("makeCurrent() failed") + functions = self.context.functions() + text = "Vendor: {}\nRenderer: {}\nVersion: {}\nShading language: {}".format( + functions.glGetString(GL.GL_VENDOR), functions.glGetString(GL.GL_RENDERER), + functions.glGetString(GL.GL_VERSION), + functions.glGetString(GL.GL_SHADING_LANGUAGE_VERSION)) + self.context.doneCurrent() + return text + +class MainWindow(QWidget): + def __init__(self): + super(MainWindow, self).__init__() + hBoxLayout = QHBoxLayout(self) + self.plainTextEdit = QPlainTextEdit() + self.plainTextEdit.setMinimumWidth(400) + self.plainTextEdit.setReadOnly(True) + hBoxLayout.addWidget(self.plainTextEdit) + self.renderWindow = RenderWindow(QSurfaceFormat()) + container = QWidget.createWindowContainer(self.renderWindow) + container.setMinimumSize(QSize(400, 400)) + hBoxLayout.addWidget(container) + + def updateDescription(self): + text = "{}\n\nPython {}\n\n{}".format(QLibraryInfo.build(), sys.version, + self.renderWindow.glInfo()) + self.plainTextEdit.setPlainText(text) + +if __name__ == '__main__': + app = QApplication(sys.argv) + mainWindow = MainWindow() + mainWindow.show() + mainWindow.updateDescription() + sys.exit(app.exec_()) |