LWJGL and Slick - Textures not showing

Question

I've tried to make a simple class for loading spritesheets and drawing 2D textures from it. However, when I try to render one of the sprites, it doesn't do that properly. I either get nothing or just some pink dots (https://i.stack.imgur.com/9T8vO.png). Can someone please help me find out what is wrong?

public enum Art
{
    GREEN("misc_1", 7, 5, 27, 10),
    BLUE("misc_1", 6, 37, 28, 5),
    MAGENTA("misc_1", 19, 68, 28, 6);

    private String spritesheet;
    private int coordX;
    private int coordY;
    private int width;
    private int height;

    Art(String s, int x, int y, int w, int h)
    {
        this.spritesheet = s;
        this.coordX = x;
        this.coordY = y;
        this.width = w;
        this.height = h;
    }

    public String getSpritesheet()
    {
        return this.spritesheet;
    }

    public void render(int x, int y, int w, int h)
    {
        if (spritesheets.containsKey(this.getSpritesheet()))
        {
            Texture tex = spritesheets.get(this.getSpritesheet());
            if (glGetInteger(GL_TEXTURE_BINDING_2D) != tex.getTextureID())
            {
                tex.bind();
            }

            float i = coordX / tex.getWidth();
            float j = coordY / tex.getHeight();
            float k = (coordX + width) / tex.getWidth();
            float l = (coordY + height) / tex.getHeight();

            int xx = x + w;
            int yy = y + h;

            glBegin(GL_QUADS);
                glTexCoord2f(i, j);
                glVertex2i(x, y);
                glTexCoord2f(k, j);
                glVertex2i(xx, y);
                glTexCoord2f(k, l);
                glVertex2i(xx, yy);
                glTexCoord2f(i, l);
                glVertex2i(x, yy);
            glEnd();
        }
    }

    private static boolean isLoaded = false;
    public static HashMap<String, Texture> spritesheets = new HashMap<String, Texture>();

    public static void loadTextures()
    {
        if (!isLoaded)
        {
            try
            {
                Texture misc_1 = TextureLoader.getTexture("PNG", new FileInputStream("res/misc_1.png"));
                spritesheets.put("misc_1", misc_1);
            } catch (IOException e)
            {
                e.printStackTrace();
            }
            isLoaded = true;
        }
    }
}

If it helps, this is what my initGL method looks like:

private void initGL()
{
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, 1280, 720, 0, 1, -1);
    glMatrixMode(GL_MODELVIEW);
    glEnable(GL_TEXTURE_2D);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}

EDIT: I just had to change getWidth() and getHeight() to getImageWidth() and getImageHeight(), that resolved the issue.

Answer 1

You don't show the definition of your Texture class. But I figure that getWidth() and getHeight() return int results. If that's the case, you have a problem here:

float i = coordX / tex.getWidth();
float j = coordY / tex.getHeight();

Both coordX and tex.getWidth() are values of type int, so the division will be carried out as an integer division. Which means for example that if coordX is less than tex.getWidth(), the result will always be zero.

To get a floating point division, you will need to cast one of the values to a float:

float i = (float)coordX / tex.getWidth();
float j = (float)coordY / tex.getHeight();

See for example this question for more details: How to make the division of 2 ints produce a float instead of another int?.