5635823e17
As in the past, to avoid rewriting various autotests that contain line-number information, an extra blank line has been inserted at the end of the license text to ensure that this commit does not change the total number of lines in the license header. Change-Id: I311e001373776812699d6efc045b5f742890c689 Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
173 lines
6.8 KiB
C++
173 lines
6.8 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
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** the names of its contributors may be used to endorse or promote
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** products derived from this software without specific prior written
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** permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "geometryengine.h"
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#include <QVector2D>
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#include <QVector3D>
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struct VertexData
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{
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QVector3D position;
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QVector2D texCoord;
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};
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GeometryEngine::GeometryEngine() : vboIds(new GLuint[2])
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{
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}
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GeometryEngine::~GeometryEngine()
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{
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glDeleteBuffers(2, vboIds);
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delete[] vboIds;
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}
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void GeometryEngine::init()
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{
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initializeGLFunctions();
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//! [0]
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// Generate 2 VBOs
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glGenBuffers(2, vboIds);
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//! [0]
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// Initializes cube geometry and transfers it to VBOs
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initCubeGeometry();
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}
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void GeometryEngine::initCubeGeometry()
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{
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// For cube we would need only 8 vertices but we have to
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// duplicate vertex for each face because texture coordinate
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// is different.
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VertexData vertices[] = {
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// Vertex data for face 0
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{QVector3D(-1.0, -1.0, 1.0), QVector2D(0.0, 0.0)}, // v0
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{QVector3D( 1.0, -1.0, 1.0), QVector2D(0.33, 0.0)}, // v1
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{QVector3D(-1.0, 1.0, 1.0), QVector2D(0.0, 0.5)}, // v2
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{QVector3D( 1.0, 1.0, 1.0), QVector2D(0.33, 0.5)}, // v3
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// Vertex data for face 1
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{QVector3D( 1.0, -1.0, 1.0), QVector2D( 0.0, 0.5)}, // v4
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{QVector3D( 1.0, -1.0, -1.0), QVector2D(0.33, 0.5)}, // v5
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{QVector3D( 1.0, 1.0, 1.0), QVector2D(0.0, 1.0)}, // v6
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{QVector3D( 1.0, 1.0, -1.0), QVector2D(0.33, 1.0)}, // v7
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// Vertex data for face 2
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{QVector3D( 1.0, -1.0, -1.0), QVector2D(0.66, 0.5)}, // v8
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{QVector3D(-1.0, -1.0, -1.0), QVector2D(1.0, 0.5)}, // v9
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{QVector3D( 1.0, 1.0, -1.0), QVector2D(0.66, 1.0)}, // v10
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{QVector3D(-1.0, 1.0, -1.0), QVector2D(1.0, 1.0)}, // v11
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// Vertex data for face 3
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{QVector3D(-1.0, -1.0, -1.0), QVector2D(0.66, 0.0)}, // v12
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{QVector3D(-1.0, -1.0, 1.0), QVector2D(1.0, 0.0)}, // v13
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{QVector3D(-1.0, 1.0, -1.0), QVector2D(0.66, 0.5)}, // v14
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{QVector3D(-1.0, 1.0, 1.0), QVector2D(1.0, 0.5)}, // v15
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// Vertex data for face 4
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{QVector3D(-1.0, -1.0, -1.0), QVector2D(0.33, 0.0)}, // v16
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{QVector3D( 1.0, -1.0, -1.0), QVector2D(0.66, 0.0)}, // v17
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{QVector3D(-1.0, -1.0, 1.0), QVector2D(0.33, 0.5)}, // v18
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{QVector3D( 1.0, -1.0, 1.0), QVector2D(0.66, 0.5)}, // v19
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// Vertex data for face 5
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{QVector3D(-1.0, 1.0, 1.0), QVector2D(0.33, 0.5)}, // v20
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{QVector3D( 1.0, 1.0, 1.0), QVector2D(0.66, 0.5)}, // v21
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{QVector3D(-1.0, 1.0, -1.0), QVector2D(0.33, 1.0)}, // v22
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{QVector3D( 1.0, 1.0, -1.0), QVector2D(0.66, 1.0)} // v23
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};
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// Indices for drawing cube faces using triangle strips.
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// Triangle strips can be connected by duplicating indices
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// between the strips. If connecting strips have opposite
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// vertex order then last index of the first strip and first
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// index of the second strip needs to be duplicated. If
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// connecting strips have same vertex order then only last
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// index of the first strip needs to be duplicated.
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GLushort indices[] = {
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0, 1, 2, 3, 3, // Face 0 - triangle strip ( v0, v1, v2, v3)
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4, 4, 5, 6, 7, 7, // Face 1 - triangle strip ( v4, v5, v6, v7)
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8, 8, 9, 10, 11, 11, // Face 2 - triangle strip ( v8, v9, v10, v11)
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12, 12, 13, 14, 15, 15, // Face 3 - triangle strip (v12, v13, v14, v15)
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16, 16, 17, 18, 19, 19, // Face 4 - triangle strip (v16, v17, v18, v19)
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20, 20, 21, 22, 23 // Face 5 - triangle strip (v20, v21, v22, v23)
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};
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//! [1]
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// Transfer vertex data to VBO 0
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glBindBuffer(GL_ARRAY_BUFFER, vboIds[0]);
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glBufferData(GL_ARRAY_BUFFER, 24 * sizeof(VertexData), vertices, GL_STATIC_DRAW);
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// Transfer index data to VBO 1
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIds[1]);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, 34 * sizeof(GLushort), indices, GL_STATIC_DRAW);
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//! [1]
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}
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//! [2]
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void GeometryEngine::drawCubeGeometry(QGLShaderProgram *program)
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{
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// Tell OpenGL which VBOs to use
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glBindBuffer(GL_ARRAY_BUFFER, vboIds[0]);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIds[1]);
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// Offset for position
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int offset = 0;
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// Tell OpenGL programmable pipeline how to locate vertex position data
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int vertexLocation = program->attributeLocation("a_position");
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program->enableAttributeArray(vertexLocation);
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glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, sizeof(VertexData), (const void *)offset);
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// Offset for texture coordinate
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offset += sizeof(QVector3D);
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// Tell OpenGL programmable pipeline how to locate vertex texture coordinate data
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int texcoordLocation = program->attributeLocation("a_texcoord");
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program->enableAttributeArray(texcoordLocation);
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glVertexAttribPointer(texcoordLocation, 2, GL_FLOAT, GL_FALSE, sizeof(VertexData), (const void *)offset);
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// Draw cube geometry using indices from VBO 1
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glDrawElements(GL_TRIANGLE_STRIP, 34, GL_UNSIGNED_SHORT, 0);
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}
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//! [2]
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