terrible API that is OpenGL. Eh, Direct3D9 was awful and not at all rooted in mathematical convention. I think (0,0) was the upper left of a texture instead of

terrible API that is OpenGL. Eh, Direct3D9 was awful and not at all rooted in mathematical convention. I think (0,0) was the upper left of a texture instead of the center of the upper-left texel, too. Granted, it's been awhile. Maybe the situation has improved.