| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the examples of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:BSD$ |
| ** Commercial License Usage |
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| ** BSD License Usage |
| ** Alternatively, you may use this file under the terms of the BSD license |
| ** as follows: |
| ** |
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| ****************************************************************************/ |
| |
| #include "glwidget.h" |
| #include <QOpenGLShaderProgram> |
| #include <QOpenGLTexture> |
| #include <QMouseEvent> |
| |
| GLWidget::~GLWidget() |
| { |
| makeCurrent(); |
| vbo.destroy(); |
| for (int i = 0; i < 6; ++i) |
| delete textures[i]; |
| delete program; |
| doneCurrent(); |
| } |
| |
| QSize GLWidget::minimumSizeHint() const |
| { |
| return QSize(50, 50); |
| } |
| |
| QSize GLWidget::sizeHint() const |
| { |
| return QSize(200, 200); |
| } |
| |
| void GLWidget::rotateBy(int xAngle, int yAngle, int zAngle) |
| { |
| xRot += xAngle; |
| yRot += yAngle; |
| zRot += zAngle; |
| update(); |
| } |
| |
| void GLWidget::setClearColor(const QColor &color) |
| { |
| clearColor = color; |
| update(); |
| } |
| |
| void GLWidget::initializeGL() |
| { |
| initializeOpenGLFunctions(); |
| |
| makeObject(); |
| |
| glEnable(GL_DEPTH_TEST); |
| glEnable(GL_CULL_FACE); |
| |
| #define PROGRAM_VERTEX_ATTRIBUTE 0 |
| #define PROGRAM_TEXCOORD_ATTRIBUTE 1 |
| |
| QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this); |
| const char *vsrc = |
| "attribute highp vec4 vertex;\n" |
| "attribute mediump vec4 texCoord;\n" |
| "varying mediump vec4 texc;\n" |
| "uniform mediump mat4 matrix;\n" |
| "void main(void)\n" |
| "{\n" |
| " gl_Position = matrix * vertex;\n" |
| " texc = texCoord;\n" |
| "}\n"; |
| vshader->compileSourceCode(vsrc); |
| |
| QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this); |
| const char *fsrc = |
| "uniform sampler2D texture;\n" |
| "varying mediump vec4 texc;\n" |
| "void main(void)\n" |
| "{\n" |
| " gl_FragColor = texture2D(texture, texc.st);\n" |
| "}\n"; |
| fshader->compileSourceCode(fsrc); |
| |
| program = new QOpenGLShaderProgram; |
| program->addShader(vshader); |
| program->addShader(fshader); |
| program->bindAttributeLocation("vertex", PROGRAM_VERTEX_ATTRIBUTE); |
| program->bindAttributeLocation("texCoord", PROGRAM_TEXCOORD_ATTRIBUTE); |
| program->link(); |
| |
| program->bind(); |
| program->setUniformValue("texture", 0); |
| } |
| |
| void GLWidget::paintGL() |
| { |
| glClearColor(clearColor.redF(), clearColor.greenF(), clearColor.blueF(), clearColor.alphaF()); |
| glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); |
| |
| QMatrix4x4 m; |
| m.ortho(-0.5f, +0.5f, +0.5f, -0.5f, 4.0f, 15.0f); |
| m.translate(0.0f, 0.0f, -10.0f); |
| m.rotate(xRot / 16.0f, 1.0f, 0.0f, 0.0f); |
| m.rotate(yRot / 16.0f, 0.0f, 1.0f, 0.0f); |
| m.rotate(zRot / 16.0f, 0.0f, 0.0f, 1.0f); |
| |
| program->setUniformValue("matrix", m); |
| program->enableAttributeArray(PROGRAM_VERTEX_ATTRIBUTE); |
| program->enableAttributeArray(PROGRAM_TEXCOORD_ATTRIBUTE); |
| program->setAttributeBuffer(PROGRAM_VERTEX_ATTRIBUTE, GL_FLOAT, 0, 3, 5 * sizeof(GLfloat)); |
| program->setAttributeBuffer(PROGRAM_TEXCOORD_ATTRIBUTE, GL_FLOAT, 3 * sizeof(GLfloat), 2, 5 * sizeof(GLfloat)); |
| |
| for (int i = 0; i < 6; ++i) { |
| textures[i]->bind(); |
| glDrawArrays(GL_TRIANGLE_FAN, i * 4, 4); |
| } |
| } |
| void GLWidget::resizeGL(int width, int height) |
| { |
| int side = qMin(width, height); |
| glViewport((width - side) / 2, (height - side) / 2, side, side); |
| } |
| |
| void GLWidget::mousePressEvent(QMouseEvent *event) |
| { |
| lastPos = event->pos(); |
| } |
| |
| void GLWidget::mouseMoveEvent(QMouseEvent *event) |
| { |
| int dx = event->x() - lastPos.x(); |
| int dy = event->y() - lastPos.y(); |
| |
| if (event->buttons() & Qt::LeftButton) { |
| rotateBy(8 * dy, 8 * dx, 0); |
| } else if (event->buttons() & Qt::RightButton) { |
| rotateBy(8 * dy, 0, 8 * dx); |
| } |
| lastPos = event->pos(); |
| } |
| |
| void GLWidget::mouseReleaseEvent(QMouseEvent * /* event */) |
| { |
| emit clicked(); |
| } |
| |
| void GLWidget::makeObject() |
| { |
| static const int coords[6][4][3] = { |
| { { +1, -1, -1 }, { -1, -1, -1 }, { -1, +1, -1 }, { +1, +1, -1 } }, |
| { { +1, +1, -1 }, { -1, +1, -1 }, { -1, +1, +1 }, { +1, +1, +1 } }, |
| { { +1, -1, +1 }, { +1, -1, -1 }, { +1, +1, -1 }, { +1, +1, +1 } }, |
| { { -1, -1, -1 }, { -1, -1, +1 }, { -1, +1, +1 }, { -1, +1, -1 } }, |
| { { +1, -1, +1 }, { -1, -1, +1 }, { -1, -1, -1 }, { +1, -1, -1 } }, |
| { { -1, -1, +1 }, { +1, -1, +1 }, { +1, +1, +1 }, { -1, +1, +1 } } |
| }; |
| |
| for (int j = 0; j < 6; ++j) |
| textures[j] = new QOpenGLTexture(QImage(QString(":/images/side%1.png").arg(j + 1)).mirrored()); |
| |
| QVector<GLfloat> vertData; |
| for (int i = 0; i < 6; ++i) { |
| for (int j = 0; j < 4; ++j) { |
| // vertex position |
| vertData.append(0.2 * coords[i][j][0]); |
| vertData.append(0.2 * coords[i][j][1]); |
| vertData.append(0.2 * coords[i][j][2]); |
| // texture coordinate |
| vertData.append(j == 0 || j == 3); |
| vertData.append(j == 0 || j == 1); |
| } |
| } |
| |
| vbo.create(); |
| vbo.bind(); |
| vbo.allocate(vertData.constData(), vertData.count() * sizeof(GLfloat)); |
| } |