Dispalying Text in MFC application using Opengl

Question

I am newbie to OpenGL and I am trying to create a simple application that contains a viewport,3d model and display some text. I never used glut window and would like to use MFC window for the above functionality. The viewport and 3d model work fine but the given text is not being displayed. I have tested glutWindow based application in which the text display works. Since I dont want to use glutwindow in my application I avoided the following lines

   glutInit(&argc, argv);
    glutInitWindowSize (window_width, window_height);
    glutInitWindowPosition (window_X_position, window_Y_position);
    glutInitDisplayMode (GLUT_RGB);
    glutCreateWindow (window_title);
    glutDisplayFunc (display);

Only using MFC and OpenGL I have to display the text.

method 1:

  /* glPushMatrix();
         glRotatef( -25.0f, 0.0f, 1.0f, 0.0f );
        glTranslatef( -2.5f, -0.7f, 0.0f );    
        lListBase( m_TextID );
        glCallLists( 20, GL_UNSIGNED_BYTE, (const GLvoid*)"welcome" ); 
         glPopMatrix();*/

method 2 :

void renderstring2d(char string[], float r, float g, float b, float x, float y)
{
    glColor3f(r, g, b);

    glRasterPos2f(x, y);
    for(unsigned int i = 0; i < strlen(string); i++)
        glutBitmapCharacter(GLUT_BITMAP_9_BY_15, string[i]);
}

method 3 :

void renderstring3d(char string[], float r, float g, float b, float x, float y, float z)
{
    glDisable(GL_LIGHTING);
    glColor3f(r, g, b);

    glRasterPos3f(x, y, z);
    for(unsigned int i = 0; i < strlen(string); i++)
        glutBitmapCharacter(GLUT_BITMAP_9_BY_15, string[i]);
}

I tried all of the above methods and failed. Please help me to display text in OpenGL within an MFC application.

Failed means no text at all or displayed but at wrong location? What are the values being passed for the text location as x, y, z in your renderstring functions? Better post the code that calls these renderstring functions to figure out. — elimad

Mouze Mouze · Accepted Answer · 2015-04-23T11:59:19

You're using fixed pipeline, so you've to set up ModelView Matrix and Projection Matrix according to the coordinate system used by glutBitmapCharacter.

Look at this example: http://www.programming-techniques.com/2012/05/font-rendering-in-glut-using-bitmap.html

Dispalying Text in MFC application using Opengl

1 Answers