LWJGL GL_QUADS texture artifact

Question

I managed to get working LWJGL in Java, and I loaded a test image (tv test card), but I keep getting weird artifacts outside the image.

Code:

glBegin(GL_QUADS);
glTexCoord2f(0, 0);
glVertex2i(10, 10);
glTexCoord2f(1, 0);
glVertex2i(500, 10);
glTexCoord2f(1, 1);
glVertex2i(500, 500);
glTexCoord2f(0, 1);
glVertex2i(10, 500);
glEnd();

What could be the cause?

Answer 1

Unless you explicitly set up non-power-of-two (often imprecisely called "rectangle") textures using an extension, each dimension of your texture must be a power of two.

To draw an image with a different size, add margins so that it has power-of-two sizes, then adjust your texture coordinates (‛glTexCoord‛) to crop off the margins.

Answer 2

Try setting your textures to clamp to the size of your quad and ensure that you're not setting the textures to linear interpolation. When initializing your OpenGL code, do something like this:

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);