On 11/14/06, Joshua Gargus <schwa at fastmail.us> wrote:
>
> On Nov 14, 2006, at 1:49 PM, Mikael Kindborg wrote:
> > If one would use OpenGL for bitmapped 2D-sprites, what would be the
> > best/fastest approach? Using glDrawPixels was not very fast when I
> > tested it, because of pixel conversions I guess.
>
> Not just because of that.  You still have to upload all of the pixels
> to the graphics card, each frame.  Also, how would you scale/resize
> your sprite?  AFAIK, common OpenGL implementations do not support
> such operations (I found a Google link to an HP-extension that
> supports scaling/resizing), so you would need to do this on the CPU.
>

I see, thanks.

> > Are textures faster?
> > Will have to learn more about this.
>
> Texture-mapped quads are the way to go.
>

Looked at glTexImage2D and the documentation says that width and
height must be powers of two, which is not very nice for sprites.
However, I saw that in OpenGL 2.1 "Non-Power-Of-Two Textures" are
introduced as a standard:
http://www.opengl.org/documentation/current_version/

Regards, Micke