On Fri, 11 Apr 2008, Michael Halle wrote:
> In looking through the sprite code, I saw that computed vertices get
> rounded off to ints, and then passed in integer form to OpenGL. This
> process happens even when the sprite is scaled and rotated, where
> vertices would in general not fall on pixel boundaries.
>
> Seems like for small sprites, noticeable distortion or bad packing could
> happen.
So this is something you've not actually observed?
> As far as I know, graphics cards usually use floats internally anyway --
> are there real performance hits in removing the rounding and just
> passing the floats down to OpenGL?
The rounding is not done for performance.
More often than not you'll get artifacts and fuzziness on raster graphics if
they're not pixel-aligned. The most common artifact is flickering border
where pixels bleed in from adjacent images (in the same texture).
Richard
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