Qt OpenGL texture is black - c++

Question

I need to load a texture onto a square but whenever i start te program I can't see any texture, just a black square.
Here's the code:
GLuint texture;
interactiveScenes::interactiveScenes(QWidget *parent) :
QGLWidget(parent), ui(new Ui::interactiveScenes)
{
ui->setupUi(this);
timer = new QTimer();
connect( timer, SIGNAL(timeout()), this, SLOT(updateGL()) );
setFocusPolicy(Qt::StrongFocus);
lockMouse = true;
camPosx = 2.0, camPosy = 2.0, camPosz = 25.0;
camViewx = 2.0, camViewy = 2.0, camViewz = 0.0;
camUpx = 0.0, camUpy = 1.0, camUpz = 0.0;
mouseX = QCursor::pos().x();
mouseY = QCursor::pos().y();
setMouseTracking(true);
}
interactiveScenes::~interactiveScenes()
{
delete ui;
}
void interactiveScenes::initializeGL()
{
// Initialize QGLWidget (parent)
QGLWidget::initializeGL();
glShadeModel(GL_SMOOTH);
// White canvas
glClearColor(1.0f,1.0f,1.0f,0.0f);
// Place light
glEnable( GL_LIGHTING );
glEnable( GL_LIGHT0 );
glEnable(GL_DEPTH_TEST);
GLfloat light0_position [] = {0.1f, 0.1f, 5.0f, 0.0f};
GLfloat light_diffuse []={ 1.0, 1.0, 1.0, 1.0 };
glLightfv ( GL_LIGHT0, GL_POSITION, light0_position );
glLightfv ( GL_LIGHT0, GL_DIFFUSE, light_diffuse );
glEnable(GL_TEXTURE_2D);
img = new QImage(":/images/images.jpg", "JPG");
if (img->isNull())
std::cout << "error" <<std::endl;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
QImage tex = QGLWidget::convertToGLFormat(*img);
if (tex.isNull())
std::cout << "error" <<std::endl;
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA,
tex.width(), tex.height(),
0, GL_RGBA, GL_UNSIGNED_BYTE, tex.bits() );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
glDisable(GL_TEXTURE_2D);
timer->start(50);
}
void interactiveScenes::resizeGL(GLint width, GLint height)
{
if ((width<=0) || (height<=0))
return;
//set viewport
glViewport(0,0,width,height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
//set persepective
GLdouble aspect_ratio=(GLdouble)width/(GLdouble)height;
gluPerspective(45.0f, aspect_ratio, 0.1, 40.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void interactiveScenes::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 );
//Draw Axes
glDisable( GL_LIGHTING );
glBegin(GL_LINES);
glColor3f(1.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(10.0, 0.0, 0.0);
glColor3f(0.0, 1.0, 0.0);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 10.0, 0.0);
glColor3f(0.0, 0.0, 1.0);
glVertex3f(0.0, 0.0, 0.0);
glVertex3f(0.0, 0.0, 10.0);
glEnd();
glEnable( GL_LIGHTING );
glEnable(GL_LIGHTING);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture);
glColor3f( 1.0, 0.0, 0.0 );
glBegin(GL_POLYGON);
glTexCoord2d( 0.0, 5.0 );
glVertex3f( 0.0f, 3.0f, 0.0f );
glTexCoord2d( 0.0, 0.0);
glVertex3f( 0.0f, 0.0f, 0.0f );
glTexCoord2d( 5.0, 0.0);
glVertex3f( 3.0f, 0.0f, 0.0f );
glTexCoord2d( 5.0, 5.0);
glVertex3f( 3.0f, 3.0f, 0.0f );
glEnd();
glDisable(GL_TEXTURE_2D);
glPushMatrix();
glTranslated(2.0, 2.0 ,-4);
GLfloat shin[] = { 12.8f };
GLfloat amb[] = { 0.135f, 0.2225f, 0.1575f, 0.95f };
GLfloat diff2 [] = { 0.54f , 0.89f , 0.63f, 0.95f };
GLfloat specular[] = { 0.316228f, 0.316228f, 0.316228f, 0.95f };
glMaterialfv ( GL_FRONT, GL_SPECULAR, specular);
glMaterialfv ( GL_FRONT, GL_SHININESS, shin);
glMaterialfv ( GL_FRONT, GL_AMBIENT, amb);
glMaterialfv ( GL_FRONT, GL_DIFFUSE, diff2 );
solidSphere(2, 25, 25);
glPopMatrix();
// restore current matrix
glMatrixMode( GL_MODELVIEW );
glPopMatrix( );
}
The image loads fine from my resource file, i thought it was something with convertToGLFormat but that also returns an image.

Answer 1

Thanks to agrum I found out the problem, I tested to see if the square would show any colors and it didn't.
I didn't disable the lighting before applying the textures/colors.
After disabling the lighting when applying the texture everything works fine!