LWJGL - Switching from 3D to 2D to render text with NO external librarys

Question

I want to render 2D quads on my screen by switching to a 2D scene then switching back to 3D. I dont want to use any external librarys besides LWJGL.

This is what I got so far:

private static void renderLetter(char c, float x, float y) {
    int character = c+1;
    GL11.glPushMatrix();

    setOrthoOn();

    GL11.glTranslatef(x, y, 0);

    float[] xy = game.getResourceManager().getSpriteSheets().get(fontSheet).getXYForCell(character);
    float cellx = game.getResourceManager().getSpriteSheets().get(fontSheet).getCell_sizeX();
    float celly = game.getResourceManager().getSpriteSheets().get(fontSheet).getCell_sizeY();
    float xx = xy[0];
    float yy = xy[1];

    GL11.glBindTexture(GL11.GL_TEXTURE_2D, game.getResourceManager().getTextures().get(game.getResourceManager().getSpriteSheets().get(fontSheet).getTextureID()));
    GL11.glBegin(GL11.GL_QUADS);
        GL11.glTexCoord2f(xx, yy);
        GL11.glVertex2f(0,0);
        GL11.glTexCoord2f(xx+cellx, yy);
        GL11.glVertex2f(fontSize,0);
        GL11.glTexCoord2f(xx+cellx, yy+celly);
        GL11.glVertex2f(fontSize,fontSize);
        GL11.glTexCoord2f(xx, yy+celly);
        GL11.glVertex2f(0,fontSize);
    GL11.glEnd();
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);      

    setOrthoOff();

    GL11.glPopMatrix();
}

public static void setOrthoOn()
{
    GL11.glDisable(GL11.GL_LIGHTING);
    GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);                
    GL11.glClearDepth(1);
    GL11.glViewport(0,0,1360,768);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GL11.glOrtho(0, 1360, 768, 0, 1, -1);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
    GL11.glLoadIdentity();
}

public static void setOrthoOff()
{
    GL11.glMatrixMode(GL11.GL_PROJECTION);
    GL11.glLoadIdentity();
    GLU.gluPerspective(game.getFieldOfView(), 1360f/768f, 0.1f, 1000);
    GL11.glMatrixMode(GL11.GL_MODELVIEW);
    GL11.glLoadIdentity();
    GL11.glEnable(GL11.GL_DEPTH_TEST);
    GL11.glDepthFunc(GL11.GL_LEQUAL);
    GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);
}

the first method is to render a letter. what I am trying to do is by calling setOrthoOn switch to 2D rendering then render the quad then call setOrthoOff to switch back to 3D.

This code does nothing for me when I run it.. What am I doing wrong?

Answer 1

This should do it.

Note: some of the code may be extraneous. I'm not very experienced with OpenGL, but this worked for me. I would also recommend you import GL11 staticly. That way you don't have to type "GL11.BlaBlaBla", you can just type "BlaBlaBla".