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Setting 0,0 point in top left corner with qt and open gl



  • Hello, i want to setting like the topic says:

    QMatrix4x4 mtrx;
    mtrx.ortho(0.0f,1024.0f,0.0f,768.0f,-1.0f,1.0f);
    m_program.setUniformValue(matrixUniform,mtrx);
    

    when i set X and Y of rectangle to 0,0 open gl drawing it in bottom left corner, as i said before i need point 0,0 in top left corner
    and

    QMatrix4x4 mtrx;
    mtrx.ortho(0.0f,1024.0f,768.0f,0.0f,-1.0f,1.0f);
    m_program.setUniformValue(matrixUniform,mtrx);
    

    this piece of code does not drawing anything in my QGLWidget in any position i set.
    Can someone tell me where is the problem, thanks in advance


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