4. Texture problem with OpenGL in QT

Texture problem with OpenGL in QT


  • HI guys,

    I'm trying to make a room in Qt with OpenGL, now I'm stuck with the texture part. It doens't place my texture on the walls.

    This is my code:

    @
    #include "glwidget.h"

    GLWidget::GLWidget(QWidget *parent):QGLWidget(parent)
    {

    camPosx = 0.0,  camPosy = 0.0,    camPosz = 1.0;
camViewx = 0.0, camViewy = 0.0, camViewz = 0.0;
camUpx = 0.0,   camUpy = 1.0,   camUpz = 0.0;
timer = new QTimer();
connect( timer, SIGNAL(timeout()), this, SLOT(updateGL()) );

    }

    void GLWidget::initializeGL() {

    loadGLTextures();
glEnable(GL_TEXTURE_2D);
glClearColor(1.0f,1.0f,1.0f,0.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

glMatrixMode(GL_PROJECTION);
glLoadIdentity();

timer->start(50);

    }

    void GLWidget::resizeGL(int width, int height) {

    //set viewport
glViewport(0,0,width,height);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();

//set persepective
//change the next line order to have a different perspective
GLdouble aspect_ratio=(GLdouble)width/(GLdouble)height;
gluPerspective(45.0f, aspect_ratio, 0.1 , 100.0);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

    }

    void GLWidget::paintGL() {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glLoadIdentity();

// store current matrix
glMatrixMode( GL_MODELVIEW );
glPushMatrix( );

gluLookAt(camPosx ,camPosy ,camPosz,
          camViewx,camViewy,camViewz,
          camUpx, camUpy, camUpz );

glBindTexture(GL_TEXTURE_2D, texture[0]);
glEnable( GL_LIGHTING );
glEnable( GL_LIGHT0 );
glScalef(2.0,2.0,2.0);
glBegin(GL_QUADS);
/* Floor */
glColor3f(0,0,0);
glVertex3f(-1,-1,-1);
glVertex3f(1,-1,-1);
glVertex3f(1,-1,1);
glVertex3f(-1,-1,1);
/* Ceiling */
glVertex3f(-1,1,-1);
glVertex3f(1,1,-1);
glVertex3f(1,1,1);
glVertex3f(-1,1,1);
/* Walls */
glVertex3f(-1,-1,1);
glVertex3f(1,-1,1);
glVertex3f(1,1,1);
glVertex3f(-1,1,1);

glVertex3f(-1,-1,-1);
glVertex3f(1,-1,-1);
glVertex3f(1,1,-1);
glVertex3f(-1,1,-1);

glVertex3f(1,1,1);
glVertex3f(1,-1,1);
glVertex3f(1,-1,-1);
glVertex3f(1,1,-1);

glVertex3f(-1,1,1);
glVertex3f(-1,-1,1);
glVertex3f(-1,-1,-1);
glVertex3f(-1,1,-1);
glEnd();
glEnable( GL_LIGHTING );


// restore current matrix
glMatrixMode( GL_MODELVIEW );
glPopMatrix( );

    }
    void GLWidget::loadGLTextures()
    {
    QImage t;
    QImage b;

    if ( !b.load( "images/Naamloos.bmp" ) )
{
    qDebug("Didn't found the image.");
    b = QImage( 16, 16, QImage::Format_RGB32 );
    b.fill( 1 );
}

t = QGLWidget::convertToGLFormat( b );
glGenTextures( 1, &texture[0] );
glBindTexture( GL_TEXTURE_2D, texture[0] );
glTexImage2D( GL_TEXTURE_2D, 0, 3, t.width(), t.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, t.bits() );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

    }

    void GLWidget::keyPressEvent( QKeyEvent * e ) {

    if(e->key() == Qt::Key_Up)
    this->camPosy += 0.5;
if(e->key() == Qt::Key_Down)
    this->camPosy -= 0.5;

    }
    @

    It shows my square ( that should be my room ), but it doesn't place a .bmp file on the walls.

    Can someone help me please?

    Kind regards,

    0

  • You didn't specified texture coordinates for vertices.

    See: http://www.opengl.org/sdk/docs/man/xhtml/glTexCoord.xml

    0
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