Print text with gluPerspective

[Ruslan1994]

I need to print text on the screen with some parameters, but I use gluPerspective. In slick-util tutoial in LWJGL documentation used glOrtho. How can I do it?

[Daslee]

Set gluPerspective and draw 3d things and after done rendering 3d, set glOrtho and draw 2d things such as text.

[Ruslan1994]

Set gluPerspective and draw 3d things and after done rendering 3d, set glOrtho and draw 2d things such as text.

I did it, but I see this

private UnicodeFont onScreen;
private boolean running = true;
private float rotation = 10.0f;

public Game() {
        initDisplay();
        initFonts();

        while (running) {
            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

            init3D();
            test1();
            
            init2D();
            onScreen.drawString(0.0f, 0.0f, Float.toString(rotation));
            
            if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) {
                running = false;
            }
            
            Display.update();
            Display.sync(60);
        }
        
        Display.destroy();
        System.exit(0);
    }
    
    private void test1() {
        glPushMatrix();
        glLoadIdentity();
        glTranslatef(0.0f, 0.0f, -5.0f);
        glRotatef(rotation, 1.0f, 1.0f, 0.0f);
        glBegin(GL_QUADS);
            // top
            glColor3f(0.0f, 1.0f, 0.0f);    // blue
            glVertex3f(1.0f, 1.0f, -1.0f);
            glVertex3f(-1.0f, 1.0f, -1.0f);
            glVertex3f(-1.0f, 1.0f, 1.0f);
            glVertex3f(1.0f, 1.0f, 1.0f);
            // down
            glVertex3f(1.0f, -1.0f, 1.0f);
            glVertex3f(-1.0f, -1.0f, 1.0f);
            glVertex3f(-1.0f, -1.0f, -1.0f);
            glVertex3f(1.0f, -1.0f, -1.0f);
            // front
            glColor3f(1.0f, 1.0f, 0.0f);    // yellow
            glVertex3f(1.0f, 1.0f, 1.0f);
            glVertex3f(-1.0f, 1.0f, 1.0f);
            glVertex3f(-1.0f, -1.0f, 1.0f);
            glVertex3f(1.0f, -1.0f, 1.0f);
            // back
            glVertex3f(1.0f, -1.0f, -1.0f);
            glVertex3f(-1.0f, -1.0f, -1.0f);
            glVertex3f(-1.0f, 1.0f, -1.0f);
            glVertex3f(1.0f, 1.0f, -1.0f);
            // left
            glColor3f(1.0f, 0.0f, 0.0f);    // red
            glVertex3f(-1.0f, 1.0f, 1.0f);
            glVertex3f(-1.0f, 1.0f, -1.0f);
            glVertex3f(-1.0f, -1.0f, -1.0f);
            glVertex3f(-1.0f, -1.0f, 1.0f);
            // right
            glVertex3f(1.0f, 1.0f, -1.0f);
            glVertex3f(1.0f, 1.0f, 1.0f);
            glVertex3f(1.0f, -1.0f, 1.0f);
            glVertex3f(1.0f, -1.0f, -1.0f);
        glEnd();
        rotation += 0.5f;
        glPopMatrix();
    }
    
    private void initDisplay() {
        try {
            Display.setDisplayMode(new DisplayMode(960, 640));
            Display.setTitle("test");
            Display.setResizable(false);
            Display.create();
        }
        catch (LWJGLException e) {
            e.printStackTrace();
            Display.destroy();
            System.exit(0);
        }
        
        Mouse.setGrabbed(true);
    }
    
    private void initFonts() {
        Font awtFont = new Font("Consolas", Font.BOLD, 16);
        onScreen = new UnicodeFont(awtFont);
        onScreen.getEffects().add(new ColorEffect(java.awt.Color.white));
        onScreen.addAsciiGlyphs();
        try {
            onScreen.loadGlyphs();
        } catch (SlickException e) {
            e.printStackTrace();
        }
    }
    
    private void init2D() {
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluOrtho2D(0.0f, (float) Display.getWidth(), (float) Display.getHeight(), 0.0f);
        glMatrixMode(GL_MODELVIEW);
        glDisable(GL_DEPTH_TEST);
    }
    
    private void init3D() {
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(45.0f, (float) Display.getWidth() / (float) Display.getHeight(), 0.1f, 100.0f);
        glMatrixMode(GL_MODELVIEW);
        glEnable(GL_DEPTH_TEST);
        glDepthFunc(GL_LEQUAL);
    }

[Daslee]

You should enable blending, so font texture will have transparency. Add these two lines after initializing display:

glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

[Ruslan1994]

You should enable blending, so font texture will have transparency. Add these two lines after initializing display:

glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

Thanks, text is looking nice now, but what about cube? Can you explain me why it so strange?

[Cornix]

Is the cube supposed to be textured? If it is you probably forgot to re-bind the texture of the cube.

If the cube is not supposed to be textured you forgot to unbind the font texture or to disable texturing while drawing the cube.

[Daslee]

You should enable blending, so font texture will have transparency. Add these two lines after initializing display:

glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

Thanks, text is looking nice now, but what about cube? Can you explain me why it so strange?

Forgot about the cube, but Cornix already answered it. Use glBindTexture(GL_TEXTURE_2D, 0) after drawing the text, or bind another texture that you need.

[Ruslan1994]

Thank you, guys, you are amazing