Re: mipmap data structure

[Frank C <li...@si...>]

On 13-Jul-04, at 2:05 PM, Keith Wiley wrote:

> The QD3D manual doesn't explain clearly *how* a mipmap is organized.  I
> have made mipmaps with a single texture by providing a pixel buffer to 
> the
> image parameter and setting useMipmapping to false.  To use mipmapping 
> I
> set that to true of course.  Presumably, I need to fill in the mipmaps
> array with width, height, and rowBytes that decrease by a factor of two
> from the original texture until a size 1 is reached.
>
> I am not sure what the offset parameter is or where the lower res pixel
> buffers are stored.  There is only the one image parameter.
>
> If I were to guess, I would say that each subsequent lower res texture 
> is
> appended to the image pixel buffer, and the offset for each is from the
> beginning of the image buffer, but I have not documentation on this.

That's correct - I'm not sure Quesa actually uses the offset, but 
rather calculates it on the fly (QD3D may require it however).

Frank.