Strange Background Quad Problem

[CodeBunny]

I'm having a weird error with drawing a background, and I can't figure it out. Basically, instead of clearing the Color Buffer at the beginning of the render, I have a Quad that I render over everything behind it. The idea is that the quad can either simply have a color tied to it (black is the default) or it can have a texture mapped as well.

The setup works fantastically if I'm mapping a texture to the quad, but for some reason it doesn't render if I'm not using an image. Here's the basic code:

public void render()
{
        GL11.glMatrixMode(GL11.GL_MODELVIEW);
        GL11.glLoadIdentity();

        drawBackground();

        //The rest of the render call works fine.
}

public void drawBackground()
{
        if(getTransparency() > 0) // The background can be transparent. This allows for a weak "motion blur" effect when the Color Buffer isn't cleared.
        {
                double screenWidth = Display.getDisplayMode().getWidth();
                double screenHeight = Display.getDisplayMode().getHeight();
                getColor().bind();                        // This is the color the image is set to. If the background has an image, it's colorized appropriately.
                GL11.glTranslated(screenWidth/2, screenHeight/2, 0);
                if(rotateWithCamera)
                {
                        GL11.glRotatef(-DataManager.getCurrentCamera().getRotation(), 0, 0, 1f);
                }
                if(!useImage)                // useImage is a boolean that is true when the Background has a valid image, and false otherwise.
                {
                        GL11.glBegin(GL11.GL_QUADS);

                                GL11.glVertex2f(-width/2, -height/2);
                                GL11.glVertex2f(width/2, -height/2);
                                GL11.glVertex2f(width/2, height/2);
                                GL11.glVertex2f(-width/2, height/2);

                        GL11.glEnd();
                }
                else
                {
                        Image skin = getImage();                // Returns a Texture from the Slick-Util library.
                        skin.bind();
                        GL11.glBegin(GL11.GL_QUADS);

                                GL11.glTexCoord2f(0, 0);
                                GL11.glVertex2f(-width/2, -height/2);
                                GL11.glTexCoord2f(skin.getWidthRatio(), 0);
                                GL11.glVertex2f(width/2, -height/2);
                                GL11.glTexCoord2f(skin.getWidthRatio(), skin.getHeightRatio());
                                GL11.glVertex2f(width/2, height/2);
                                GL11.glTexCoord2f(0, skin.getHeightRatio());
                                GL11.glVertex2f(-width/2, height/2);

                        GL11.glEnd();
                }
                if(rotateWithCamera)
                {
                        GL11.glRotatef(DataManager.getCurrentCamera().getRotation(), 0, 0, 1f);
                }
                GL11.glTranslated(-screenWidth/2, -screenHeight/2, 0);
                GL11.glLoadIdentity();
        }
}

Am I messing something up in the render process when useImage is false?

[Matthias]

glEnable / glDisable GL_TEXTURE_2D when you use fixed function - or you need to use the correct shader

[CodeBunny]

That fixed it.

Thanks!