From f3ecda32e0f7bd21b44e7737d2939dcce2c26517 Mon Sep 17 00:00:00 2001 From: Johan Klokkhammer Helsing Date: Wed, 11 Dec 2019 14:50:40 +0100 Subject: Move QOpenGLPaintEngine and related classes from QtGui to QtOpenGL Also moves the openglwindow test to the opengl folder, as it makes use of these classes. Task-number: QTBUG-74409 Change-Id: Id9f0013cedcc8bd1e87122c005641d7298525045 Reviewed-by: Laszlo Agocs --- examples/opengl/openglwindow/main.cpp | 177 ++++++++++++++++++++++++++++++++++ 1 file changed, 177 insertions(+) create mode 100644 examples/opengl/openglwindow/main.cpp (limited to 'examples/opengl/openglwindow/main.cpp') diff --git a/examples/opengl/openglwindow/main.cpp b/examples/opengl/openglwindow/main.cpp new file mode 100644 index 0000000000..03a6ece06f --- /dev/null +++ b/examples/opengl/openglwindow/main.cpp @@ -0,0 +1,177 @@ +/**************************************************************************** +** +** Copyright (C) 2016 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, 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." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "openglwindow.h" + +#include +#include +#include +#include +#include + + +//! [1] +class TriangleWindow : public OpenGLWindow +{ +public: + using OpenGLWindow::OpenGLWindow; + + void initialize() override; + void render() override; + +private: + GLint m_posAttr = 0; + GLint m_colAttr = 0; + GLint m_matrixUniform = 0; + + QOpenGLShaderProgram *m_program = nullptr; + int m_frame = 0; +}; +//! [1] + +//! [2] +int main(int argc, char **argv) +{ + QGuiApplication app(argc, argv); + + QSurfaceFormat format; + format.setSamples(16); + + TriangleWindow window; + window.setFormat(format); + window.resize(640, 480); + window.show(); + + window.setAnimating(true); + + return app.exec(); +} +//! [2] + + +//! [3] +static const char *vertexShaderSource = + "attribute highp vec4 posAttr;\n" + "attribute lowp vec4 colAttr;\n" + "varying lowp vec4 col;\n" + "uniform highp mat4 matrix;\n" + "void main() {\n" + " col = colAttr;\n" + " gl_Position = matrix * posAttr;\n" + "}\n"; + +static const char *fragmentShaderSource = + "varying lowp vec4 col;\n" + "void main() {\n" + " gl_FragColor = col;\n" + "}\n"; +//! [3] + +//! [4] +void TriangleWindow::initialize() +{ + m_program = new QOpenGLShaderProgram(this); + m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShaderSource); + m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShaderSource); + m_program->link(); + m_posAttr = m_program->attributeLocation("posAttr"); + Q_ASSERT(m_posAttr != -1); + m_colAttr = m_program->attributeLocation("colAttr"); + Q_ASSERT(m_colAttr != -1); + m_matrixUniform = m_program->uniformLocation("matrix"); + Q_ASSERT(m_matrixUniform != -1); +} +//! [4] + +//! [5] +void TriangleWindow::render() +{ + const qreal retinaScale = devicePixelRatio(); + glViewport(0, 0, width() * retinaScale, height() * retinaScale); + + glClear(GL_COLOR_BUFFER_BIT); + + m_program->bind(); + + QMatrix4x4 matrix; + matrix.perspective(60.0f, 4.0f / 3.0f, 0.1f, 100.0f); + matrix.translate(0, 0, -2); + matrix.rotate(100.0f * m_frame / screen()->refreshRate(), 0, 1, 0); + + m_program->setUniformValue(m_matrixUniform, matrix); + + static const GLfloat vertices[] = { + 0.0f, 0.707f, + -0.5f, -0.5f, + 0.5f, -0.5f + }; + + static const GLfloat colors[] = { + 1.0f, 0.0f, 0.0f, + 0.0f, 1.0f, 0.0f, + 0.0f, 0.0f, 1.0f + }; + + glVertexAttribPointer(m_posAttr, 2, GL_FLOAT, GL_FALSE, 0, vertices); + glVertexAttribPointer(m_colAttr, 3, GL_FLOAT, GL_FALSE, 0, colors); + + glEnableVertexAttribArray(m_posAttr); + glEnableVertexAttribArray(m_colAttr); + + glDrawArrays(GL_TRIANGLES, 0, 3); + + glDisableVertexAttribArray(m_colAttr); + glDisableVertexAttribArray(m_posAttr); + + m_program->release(); + + ++m_frame; +} +//! 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