Unsolved gl function not working

[manoj_prasanga]

this is my sourse code of openGL.

#include "glwidget.h"

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

}

void GLWidget:: initializeGL(){

}
void GLWidget:: paintGL(){
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1,1,0);
    glBegin(GL_TRIANGLES);
    glVertex2f(-0.7,-0.7);
    glVertex2f(+0.7,-0.7);
    glVertex2f(0.0,+0.7);
    glEnd();

}
void  GLWidget ::resizeGL(int w, int h){
   glViewport(0,0,w,h);
}

But it's not working properly.There is a messages

"D:\Acedamic\4th year\PR410 Manufacturing project1\Qt\gui\glwidget.cpp:14: error: 'GL_COLOR_BUFFER_BIT' was not declared in this scope
glClear(GL_COLOR_BUFFER_BIT);"

and

"D:\Acedamic\4th year\PR410 Manufacturing project1\Qt\gui\glwidget.cpp:14: error: 'glClear' was not declared in this scope
glClear(GL_COLOR_BUFFER_BIT);"

what can i do?

/edit by moderator: added <code> tags

[Christian Ehrlicher]

@manoj_prasanga said in gl function not working:

what can i do?

Maybe include the header which defines glClear() which is imo gl.h

[aha_1980]

@manoj_prasanga

One more note:

"D:\Acedamic\4th year\PR410 Manufacturing project1\Qt\gui\glwidget.cpp..."

Avoid whitespaces and special characters in path and file names by all means.

It will hurt you!

Regards

[SGaist]

Hi,

@manoj_prasanga said in gl function not working:

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

}

Is your GLWidget class really a subclass of QWidget ? If so you should first change that to QOpenGLWidget.

[manoj_prasanga]

@Christian-Ehrlicher thanx freind