qt5base-lts/examples/opengl/cube/geometryengine.cpp
Axel Waggershauser b11317a643 Whitespace cleanup: remove trailing whitespace
Remove all trailing whitespace from the following list of files:
*.cpp *.h *.conf *.qdoc *.pro *.pri *.mm *.rc *.pl *.qps *.xpm *.txt *README
excluding 3rdparty, test-data and auto generated code.

Note A): the only non 3rdparty c++-files that still
have trailing whitespace after this change are:
* src/corelib/codecs/cp949codetbl_p.h
* src/corelib/codecs/qjpunicode.cpp
* src/corelib/codecs/qbig5codec.cpp
* src/corelib/xml/qxmlstream_p.h
* src/tools/qdoc/qmlparser/qqmljsgrammar.cpp
* src/tools/uic/ui4.cpp
* tests/auto/other/qtokenautomaton/tokenizers/*
* tests/benchmarks/corelib/tools/qstring/data.cpp
* util/lexgen/tokenizer.cpp

Note B): in about 30 files some overlapping 'leading tab' and
'TAB character in non-leading whitespace' issues have been fixed
to make the sanity bot happy. Plus some general ws-fixes here
and there as asked for during review.

Change-Id: Ia713113c34d82442d6ce4d93d8b1cf545075d11d
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
2013-03-16 20:22:50 +01:00

172 lines
6.8 KiB
C++

/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
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**
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** met:
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** notice, this list of conditions and the following disclaimer.
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** the documentation and/or other materials provided with the
** distribution.
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** of its contributors may be used to endorse or promote products derived
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****************************************************************************/
#include "geometryengine.h"
#include <QVector2D>
#include <QVector3D>
struct VertexData
{
QVector3D position;
QVector2D texCoord;
};
GeometryEngine::GeometryEngine()
{
}
GeometryEngine::~GeometryEngine()
{
glDeleteBuffers(2, vboIds);
}
void GeometryEngine::init()
{
initializeGLFunctions();
//! [0]
// Generate 2 VBOs
glGenBuffers(2, vboIds);
//! [0]
// Initializes cube geometry and transfers it to VBOs
initCubeGeometry();
}
void GeometryEngine::initCubeGeometry()
{
// For cube we would need only 8 vertices but we have to
// duplicate vertex for each face because texture coordinate
// is different.
VertexData vertices[] = {
// Vertex data for face 0
{QVector3D(-1.0, -1.0, 1.0), QVector2D(0.0, 0.0)}, // v0
{QVector3D( 1.0, -1.0, 1.0), QVector2D(0.33, 0.0)}, // v1
{QVector3D(-1.0, 1.0, 1.0), QVector2D(0.0, 0.5)}, // v2
{QVector3D( 1.0, 1.0, 1.0), QVector2D(0.33, 0.5)}, // v3
// Vertex data for face 1
{QVector3D( 1.0, -1.0, 1.0), QVector2D( 0.0, 0.5)}, // v4
{QVector3D( 1.0, -1.0, -1.0), QVector2D(0.33, 0.5)}, // v5
{QVector3D( 1.0, 1.0, 1.0), QVector2D(0.0, 1.0)}, // v6
{QVector3D( 1.0, 1.0, -1.0), QVector2D(0.33, 1.0)}, // v7
// Vertex data for face 2
{QVector3D( 1.0, -1.0, -1.0), QVector2D(0.66, 0.5)}, // v8
{QVector3D(-1.0, -1.0, -1.0), QVector2D(1.0, 0.5)}, // v9
{QVector3D( 1.0, 1.0, -1.0), QVector2D(0.66, 1.0)}, // v10
{QVector3D(-1.0, 1.0, -1.0), QVector2D(1.0, 1.0)}, // v11
// Vertex data for face 3
{QVector3D(-1.0, -1.0, -1.0), QVector2D(0.66, 0.0)}, // v12
{QVector3D(-1.0, -1.0, 1.0), QVector2D(1.0, 0.0)}, // v13
{QVector3D(-1.0, 1.0, -1.0), QVector2D(0.66, 0.5)}, // v14
{QVector3D(-1.0, 1.0, 1.0), QVector2D(1.0, 0.5)}, // v15
// Vertex data for face 4
{QVector3D(-1.0, -1.0, -1.0), QVector2D(0.33, 0.0)}, // v16
{QVector3D( 1.0, -1.0, -1.0), QVector2D(0.66, 0.0)}, // v17
{QVector3D(-1.0, -1.0, 1.0), QVector2D(0.33, 0.5)}, // v18
{QVector3D( 1.0, -1.0, 1.0), QVector2D(0.66, 0.5)}, // v19
// Vertex data for face 5
{QVector3D(-1.0, 1.0, 1.0), QVector2D(0.33, 0.5)}, // v20
{QVector3D( 1.0, 1.0, 1.0), QVector2D(0.66, 0.5)}, // v21
{QVector3D(-1.0, 1.0, -1.0), QVector2D(0.33, 1.0)}, // v22
{QVector3D( 1.0, 1.0, -1.0), QVector2D(0.66, 1.0)} // v23
};
// Indices for drawing cube faces using triangle strips.
// Triangle strips can be connected by duplicating indices
// between the strips. If connecting strips have opposite
// vertex order then last index of the first strip and first
// index of the second strip needs to be duplicated. If
// connecting strips have same vertex order then only last
// index of the first strip needs to be duplicated.
GLushort indices[] = {
0, 1, 2, 3, 3, // Face 0 - triangle strip ( v0, v1, v2, v3)
4, 4, 5, 6, 7, 7, // Face 1 - triangle strip ( v4, v5, v6, v7)
8, 8, 9, 10, 11, 11, // Face 2 - triangle strip ( v8, v9, v10, v11)
12, 12, 13, 14, 15, 15, // Face 3 - triangle strip (v12, v13, v14, v15)
16, 16, 17, 18, 19, 19, // Face 4 - triangle strip (v16, v17, v18, v19)
20, 20, 21, 22, 23 // Face 5 - triangle strip (v20, v21, v22, v23)
};
//! [1]
// Transfer vertex data to VBO 0
glBindBuffer(GL_ARRAY_BUFFER, vboIds[0]);
glBufferData(GL_ARRAY_BUFFER, 24 * sizeof(VertexData), vertices, GL_STATIC_DRAW);
// Transfer index data to VBO 1
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIds[1]);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, 34 * sizeof(GLushort), indices, GL_STATIC_DRAW);
//! [1]
}
//! [2]
void GeometryEngine::drawCubeGeometry(QGLShaderProgram *program)
{
// Tell OpenGL which VBOs to use
glBindBuffer(GL_ARRAY_BUFFER, vboIds[0]);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, vboIds[1]);
// Offset for position
quintptr offset = 0;
// Tell OpenGL programmable pipeline how to locate vertex position data
int vertexLocation = program->attributeLocation("a_position");
program->enableAttributeArray(vertexLocation);
glVertexAttribPointer(vertexLocation, 3, GL_FLOAT, GL_FALSE, sizeof(VertexData), (const void *)offset);
// Offset for texture coordinate
offset += sizeof(QVector3D);
// Tell OpenGL programmable pipeline how to locate vertex texture coordinate data
int texcoordLocation = program->attributeLocation("a_texcoord");
program->enableAttributeArray(texcoordLocation);
glVertexAttribPointer(texcoordLocation, 2, GL_FLOAT, GL_FALSE, sizeof(VertexData), (const void *)offset);
// Draw cube geometry using indices from VBO 1
glDrawElements(GL_TRIANGLE_STRIP, 34, GL_UNSIGNED_SHORT, 0);
}
//! [2]