Manual interleaving and deinterleaving in the driver seems to be the easiest solution. You just need 2 blits. You can reuse u_blitter for setting up stuff or you can create your own thing.
Adding separate Z+S to Gallium and st/mesa would be quite a lot work, and what you want to support is an interleaved format anyway. I suppose you wouldn't be exposing separate formats to applications, you just want a way to convert an interleaved ZS to separate buffers for your driver. We don't plan to expose separate Z+S to applications due to tiling restrictions on Radeon. Marek On Wed, Mar 18, 2015 at 4:52 PM, Ilia Mirkin <imir...@alum.mit.edu> wrote: > Hello, > > I've run into a situation where a3xx hardware does not natively > support Z32F_S8 (interleaved). However it will happily support Z32F > and S8 separately (and at the same time). Haven't looked at how a4xx > handles this, but wouldn't be surprised if it were the same. > > One way to do this is to expose the Z32F_X24S8 format in the driver, > but internally just store the two sets of data separately. Then add > hooks to the transfer logic to interleave/deinterleave the data on > transfer in/out. This seems hacky. > > Another approach is to teach gallium about split depth/stencil > buffers, i.e. adding a pipe_surface *sbuf next to the zsbuf. Then, > guarded by a PIPE_CAP, the st would be able to make use of it. Both > for binding separate depth/stencil textures (e.g. Z16 + S8), as well > as to create adapters for this situation. I guess it'd still be a bit > of a hack, but at least it would be reusable by other hw. > > Is there any other hw out there that would need this? Any preferences > on how I should approach it? > > FTR, Z32F_X24S8 is needed for both GL3 (ARB_depth_buffer_float) and GLES3. > > Cheers, > > -ilia > _______________________________________________ > mesa-dev mailing list > mesa-dev@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/mesa-dev _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
