glTexCoord for images with many tiles?

OpenGL Development
#1

Take a look at this image

It’s a 7824 image of the alphabet, with each letter in a 66, so 52 total squares.

Wouldn’t using glTexCoord to get a single letter out of that image get kind of tedious?

	GL11.glTexCoord2f(0,0);
	
	GL11.glTexCoord2f(1/13,0);
	
	GL11.glTexCoord2f(1/13,1/4);
	
	GL11.glTexCoord2f(0,1/4);

Since 1/13 of 78 is 6 and 1/4 of 24 is 6, is this kind of what I’m looking to do, to single out a letter? I’m just making sure this is the way to go. Thanks

EDIT: The 1/13 and 1/4 would be decimals in the actual code so that it would actually work, this is just so that it’ll read easier(just like the glVertex3f isn’t there)

#2

That’s how you do it all right, but you don’t do it by hand. You take advantage of the fact that the sub-images are all uniform size and write a class to do the calculations and generate the vertices for you. There’s many implementations of this class out there; take a look at just about any “tile map” implementation (I have one, but it’s in Scala).

#3

Thank you; looks like I’m on the right track then. Getting it to calculate all that automatically sounds like a good(and necessary) step from here, I’ll try to work that out next.