1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the documentation of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:BSD$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** BSD License Usage 18 ** Alternatively, you may use this file under the terms of the BSD license 19 ** as follows: 20 ** 21 ** "Redistribution and use in source and binary forms, with or without 22 ** modification, are permitted provided that the following conditions are 23 ** met: 24 ** * Redistributions of source code must retain the above copyright 25 ** notice, this list of conditions and the following disclaimer. 26 ** * Redistributions in binary form must reproduce the above copyright 27 ** notice, this list of conditions and the following disclaimer in 28 ** the documentation and/or other materials provided with the 29 ** distribution. 30 ** * Neither the name of The Qt Company Ltd nor the names of its 31 ** contributors may be used to endorse or promote products derived 32 ** from this software without specific prior written permission. 33 ** 34 ** 35 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 36 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 37 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 38 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 39 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 40 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 41 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 42 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 43 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 44 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 45 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." 46 ** 47 ** $QT_END_LICENSE$ 48 ** 49 ****************************************************************************/ 50 51 //! [0] 52 QOpenGLShader shader(QOpenGLShader::Vertex); 53 shader.compileSourceCode(code); 54 55 QOpenGLShaderProgram program(context); 56 program.addShader(&shader); 57 program.link(); 58 59 program.bind(); 60 //! [0] 61 62 //! [1] 63 program.addShaderFromSourceCode(QOpenGLShader::Vertex, 64 "attribute highp vec4 vertex;\n" 65 "uniform highp mat4 matrix;\n" 66 "void main(void)\n" 67 "{\n" 68 " gl_Position = matrix * vertex;\n" 69 "}"); 70 program.addShaderFromSourceCode(QOpenGLShader::Fragment, 71 "uniform mediump vec4 color;\n" 72 "void main(void)\n" 73 "{\n" 74 " gl_FragColor = color;\n" 75 "}"); 76 program.link(); 77 program.bind(); 78 79 int vertexLocation = program.attributeLocation("vertex"); 80 int matrixLocation = program.uniformLocation("matrix"); 81 int colorLocation = program.uniformLocation("color"); 82 //! [1] 83 84 //! [2] 85 static GLfloat const triangleVertices[] = { 86 60.0f, 10.0f, 0.0f, 87 110.0f, 110.0f, 0.0f, 88 10.0f, 110.0f, 0.0f 89 }; 90 91 QColor color(0, 255, 0, 255); 92 93 QMatrix4x4 pmvMatrix; 94 pmvMatrix.ortho(rect()); 95 96 program.enableAttributeArray(vertexLocation); 97 program.setAttributeArray(vertexLocation, triangleVertices, 3); 98 program.setUniformValue(matrixLocation, pmvMatrix); 99 program.setUniformValue(colorLocation, color); 100 101 glDrawArrays(GL_TRIANGLES, 0, 3); 102 103 program.disableAttributeArray(vertexLocation); 104 //! [2] 105