If you are trying to draw a white rectangle, you need to either disable texturing or (preferably) use a white texture. Otherwise, your vertex color will be multiplied with the texture color, and you might end up with an unexpected result.
So it looks like this:
Texture white = TextureLoader.getTexture(... "white.png" ...); // a 2x2 opaque white texture
Texture myImg = TextureLoader.getTexture(... "img.png" ...); //a sprite
... in render ...
white.bind(); //bind the opaque white texture
//now you can render a square, using glColor3f to change its color
...
myImg.bind(); //bind your sprite..
//now you can render your sprites as normal...
The problem here, obviously, is that it leads to an extra texture bind. The solution is to use sprite sheets, which you should already be using, instead of a separate Texture for your white 2x2 rectangle.
I’d strongly recommend you to avoid using SlickUtil – it isn’t well maintained, it’s buggy, and it forces you into bad practices (i.e. immediate mode). Instead you should write your own texture loading code, through which you will learn a lot more than if you just continue to use SlickUtil.
Check out my display tutorial here to get a better idea of how to write your application lifecycle:
Then you can move on to writing your own texture loader:
You can see other tutorials here:
Feel free to use the API as a replacement to SlickUtil. It is more minimal and works better with modern GL, has better support for fonts, texture regions, shaders, etc.
I forget to clean my code so it’s a simplier code :
