LWJGL Forum

I am writing a little program which will have the main 3d game area in the top left, and the score+message box on the right hand side and bottom of the screen.

So I create a viewport, draw the 3d, but when doing my gui bits the text placement is screwed up. Is this pseudo code correct?


public int VIEWPORT_X = 75;
public int VIEWPORT_Y = 150;
public int VIEWPORT_WIDTH = 650;
public int VIEWPORT_HEIGHT = 450;
public int SCREEN_WIDTH = 800;
public int SCREEN_HEIGHT = 600;
public int SCREEN_BPP = 32;

 public void glPrint(int x, int y, int set, String msg)
 {
   int offset = base - 32 + (128 * set);

   GL11.glEnable(GL11.GL_TEXTURE_2D);                          // Enable Texture Mapping
   GL11.glLoadIdentity();                                      // Reset The Modelview Matrix
   GL11.glTranslatef(x, y, 0);                                 // Position The Text (0,0 - Bottom Left)
   if(msg != null)
   {
       GL11.glBindTexture(GL11.GL_TEXTURE_2D, textures[0]);

       for(int i=0;i<msg.length();i++)
       {
           GL11.glCallList(offset + msg.charAt(i));
           GL11.glTranslatef(0.05f, 0.0f, 0.0f);
       }
   }
 }


GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
GLU.gluPerspective( 45.0f,VIEWPORT_WIDTH/VIEWPORT_HEIGHT,0.1f,100 );
GL11.glViewport(VIEWPORT_X, VIEWPORT_Y, VIEWPORT_WIDTH, VIEWPORT_HEIGHT);

//clear background
GL11.glClear(GL11.GL_COLOR_BUFFER_BIT);

GL11.glLoadIdentity(); // reset the matrix

                  -- draw 3d
                  -- glprint works here

GL11.glMatrixMode(GL11.GL_MODELVIEW);
GL11.glLoadIdentity();
GLU.gluPerspective( 45.0f, SCREEN_WIDTH/SCREEN_HEIGHT,0.1f,100 );
GL11.glViewport( 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT );
GL11.glLoadIdentity(); // reset the matrix

                 -- draw 2d gui stuff
                 -- glprint does not position correctly here


Problem fixed by adding

      // set projection matrix
      GL11.glMatrixMode(GL11.GL_PROJECTION);
      GL11.glLoadIdentity();
      GLU.gluOrtho2D(0, VIEWPORT_WIDTH, 0, VIEWPORT_HEIGHT);

      // set projection matrix
      GL11.glMatrixMode(GL11.GL_PROJECTION);
      GL11.glLoadIdentity();
      GLU.gluOrtho2D( 0, SCREEN_WIDTH, 0, SCREEN_HEIGHT);

before the 2 viewports.

Thanks!