On Sun, Jun 25, 2017 at 5:39 PM, Jason Ekstrand <ja...@jlekstrand.net> wrote: > On June 25, 2017 2:31:56 PM Ilia Mirkin <imir...@alum.mit.edu> wrote: > >> On Sun, Jun 25, 2017 at 5:25 PM, Jason Ekstrand <ja...@jlekstrand.net> >> wrote: >>> >>> On June 25, 2017 1:40:09 PM Ilia Mirkin <imir...@alum.mit.edu> wrote: >>> >>>> On Sun, Jun 25, 2017 at 4:33 PM, Jason Ekstrand <ja...@jlekstrand.net> >>>> wrote: >>>>>> >>>>>> >>>>>> Anyone have thoughts on this? Am I being foolish for trying to hold >>>>>> onto GL_RGBA4 texturing? (Any decision here also affects st/nine.) >>>>> >>>>> >>>>> >>>>> >>>>> Yes. Chances are that you're also doing texture views wrong. Are >>>>> there >>>>> any >>>>> 4444 formats supported on nvidia hardware? >>>> >>>> >>>> >>>> Well, any permutation of a 4444 format is easily supportable for >>>> texturing. >>>> >>>> What's wrong with the texture views? Should be fine... unless I'm >>>> missing something. It's really just this issue with RB <-> Texture >>>> copies where the RB's internal format is GL_RGBA4 while the *real* >>>> internal format is RGBA8. Texture views between e.g. RGB565 and >>>> RGBA4444 should work fine (and the fb will fail to validate as one >>>> might expect if one were to attach a GL_RGBA4 texture view of a >>>> GL_RGB565 texture). >>> >>> >>> >>> But what if you have a 4444 and you render to as 4444 and then try to >>> texture from it as 565? >> >> >> If you have a 4444 texture and attach it to a FB, then that FB will >> not be complete. So you can't render to it in the first place. > > > Ok, then I'm confused as to how you have a copy_image problem. Is the issue > just that gallium won't let you CopyImageSubData into a texture you can't > render into? Why not just treat it as R16 when using it as a copy_image > destination?
No, the issue is copying between a GL_RGBA4 RB and GL_RGBA4 texture. Behind the scenes, the GL_RGBA4 RB gets upgraded to a 8-bit-per-channel format, while the GL_RGBA4 texture has a 4-bit-per-channel format. Then when trying to copy-image between them, you have two totally differently-formatted textures. -ilia _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev
