LWJGL Forum

I am a newcomer in java and lwjgl. Now I tried to render a text and found the slick libary(if there is a "easy" way to solve my problem without slick please tell me).
Here is my code which I am using to render the text:
public class FontRenderer implements IComponent
{
private UnicodeFont _font;
private FloatBuffer _orthographicProjectionMatrix;
private Color _color;
private String _text;

public FontRenderer()
{
this(new UnicodeFont(new Font("Times New Roman", Font.BOLD, 18)),
Color.white);
}
public FontRenderer(UnicodeFont font, Color color)
{
_font = font;
_color = color;
}

@SuppressWarnings("unchecked")
@Override
public void load(int time) {
_font.getEffects().add(new ColorEffect(_color));
_font.addAsciiGlyphs();
try {
_font.loadGlyphs();
} catch (SlickException e) {
System.out.println("Fehler beim Laden einer Schriftart.");
e.printStackTrace();
}

_orthographicProjectionMatrix = BufferUtils.createFloatBuffer(16);
_perspectiveProjectionMatrix = BufferUtils.createFloatBuffer(16);
createMatrix(Display.getWidth(), Display.getHeight());

//setup blending
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}

@Override
public void draw(int time) {
FloatBuffer perspectiveProjectionMatrix = BufferUtils.createFloatBuffer(16);
glGetFloat(GL_MODELVIEW_MATRIX, perspectiveProjectionMatrix);

glMatrixMode(GL_PROJECTION);
glLoadMatrix(_orthographicProjectionMatrix);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();

boolean enableLight = glGetBoolean(GL_LIGHTING);
glDisable(GL_LIGHTING);

_font.drawString(0, 0, _text);

if(enableLight) glEnable(GL_LIGHTING);

glLoadIdentity();
glPopMatrix();
glLoadMatrix(perspectiveProjectionMatrix);
glMatrixMode(GL_PROJECTION);
glLoadMatrix(_perspectiveProjectionMatrix);
glMatrixMode(GL_MODELVIEW);
}

private void createMatrix(double width, double height)
{
FloatBuffer perspectiveProjectionMatrix = BufferUtils.createFloatBuffer(16);
glGetFloat(GL_MODELVIEW_MATRIX, perspectiveProjectionMatrix);
glGetFloat(GL_PROJECTION_MATRIX, _perspectiveProjectionMatrix);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, width, height, 0, 1, -1);
glGetFloat(GL_PROJECTION_MATRIX, _orthographicProjectionMatrix);
glLoadMatrix(_perspectiveProjectionMatrix);
glMatrixMode(GL_MODELVIEW);
}
}

My problem is that the text is rendered correctly but I can't see my rendered spheres, boxes,... anymore.
Sometimes if I move my camera exactly to one point(its always a different one) I can see half drawn objects in the 3d space.
You can see that in my attached file.

So I hope you can help me to solve that problem.
Ah and by the way I am rendering the text after rendering the 3d models.

It looks to me like you are over-complicating things. The best thing to do is to draw all your text/GUI last and not worry about having to mess with so many matrix manipulations:
This should be in your main loop:

public class MainLoopClass
{
private FontRenderer _fontRenderer;

public void Initialize()
{
// Do the other OpenGL stuff you need to set up in here
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

_fontRenderer = new FontRenderer(); // Or whatever you want to pass in to the constructor
_fontRenderer.load(0);
}
public void MainLoop()
{
// Draw 3D stuff and other stuff you need to do

glDisable(GL_LIGHTING);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, width, height, 0, 1, -1);

glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();

_fontRenderer.draw(time, "This is my string I want to draw");

glPopMatrix();
}
}

Your FontRenderer class should be much simpler, like this:

public class FontRenderer implements IComponent
{
private UnicodeFont _font;
private Color _color;

public FontRenderer()
{
this(new UnicodeFont(new Font("Times New Roman", Font.BOLD, 18)),
Color.white);
}
public FontRenderer(UnicodeFont font, Color color)
{
_font = font;
_color = color;
}

@SuppressWarnings("unchecked")
@Override
public void load(int time) {
_font.getEffects().add(new ColorEffect(_color));
_font.addAsciiGlyphs();
try {
_font.loadGlyphs();
} catch (SlickException e) {
System.out.println("Fehler beim Laden einer Schriftart.");
e.printStackTrace();
}
}

@Override
public void draw(int time, string text) {
_font.drawString(0, 0, text);
}
}

Still the same problem. I tried it out. With my and your solution I everything works fine until i add the line: _font.drawString(0, 0, _text);.
This line is the only problem. I just need to comment that line and everything works fine.

EDIT: I just took a closer look to this article: http://www.lwjgl.org/wiki/index.php?title=Slick-Util_Library_-_Part_3_-_TrueType_Fonts_for_LWJGL. If I am using TrueTypeFont it works fine :) thx.
EDIT2: But there is still one problem left. I can't use a new line :(