https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/nouveau/nvc0/nvc0_miptree.c#n190
On Thu, Oct 25, 2018 at 6:30 AM Fernando Sahmkow <fsahmko...@gmail.com> wrote:
>
> I'm currently implementing mipmaps but I have a set of troubles guessing the
> block height and block depth of them. According to
> https://envytools.readthedocs.io/en/latest/hw/memory/g80-surface.html#textures-mipmapping-and-arrays
> the texture unit auto resizes mipmaps' blocks but how do I know how many
> blocks each one uses?
>
> I'm currently using this algorithm:
> u32 height = MipHeight(mip_level);
> u32 gobs_in_y = (height + 7) / 8;
> u32 bh = block_height;
> // Magical block resizing algorithm, needs more testing.
> while (bh > 1 && (gobs_in_y + bh - 1) / bh <= 2) {
> bh >>= 1;
> }
> return bh;
> it works 95% of the time but doesn't fit the correct block size all the time.
> Do you guys got any info on the correct algorithm used?
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