On Tue, Dec 11, 2018 at 6:34 PM Rob Clark <robdcl...@gmail.com> wrote:
>
> On Tue, Dec 11, 2018 at 6:10 PM Ilia Mirkin <imir...@alum.mit.edu> wrote:
> >
> > On Tue, Dec 11, 2018 at 5:50 PM Rob Clark <robdcl...@gmail.com> wrote:
> > >
> > > Signed-off-by: Rob Clark <robdcl...@gmail.com>
> > > ---
> > > src/gallium/include/pipe/p_context.h | 11 +++++++++++
> > > src/mesa/state_tracker/st_cb_fbo.c | 26 ++++++++++++++++++++++++++
> > > 2 files changed, 37 insertions(+)
> > >
> > > diff --git a/src/gallium/include/pipe/p_context.h
> > > b/src/gallium/include/pipe/p_context.h
> > > index d4e9179b78a..eb52c7e9a4e 100644
> > > --- a/src/gallium/include/pipe/p_context.h
> > > +++ b/src/gallium/include/pipe/p_context.h
> > > @@ -811,6 +811,17 @@ struct pipe_context {
> > > void (*invalidate_surface)(struct pipe_context *ctx,
> > > struct pipe_surface *surf);
> > >
> > > + /**
> > > + * Invalidate a portion of a surface. This is used to
> > > + *
> > > + * (1) implement glInvalidateSubFramebuffer() and friends
> > > + * (2) as a hint before a scissored clear (which is turned into
> > > draw_vbo()
> > > + * that the cleared rect can be discarded
> > > + */
> > > + void (*invalidate_sub_surface)(struct pipe_context *ctx,
> > > + struct pipe_surface *surf,
> > > + const struct pipe_scissor_state *rect);
> >
> > I think pipe_box is a bit more natural here than scissor state? box is
> > used for transfers, etc. This could also enable you to to specify a
> > sub-3d area. And perhaps by passing a level, you could go back to this
> > being a resource (and just extend invalidate_resource)?
>
> I prefer surface to resource+params, as I mentioned in the other reply
> on this thread.
>
> I guess box is an option.. it is overkill for what the gl API wants
> and I can't immediately think of a use for this for more than a 2d
> slice of a higher dimensioned object, where pipe_surface is a perfect
> fit. (Are there any GPUs that can render to a 3d render target? I
> guess at least the intersection of tilers and GPUs that can is pretty
> small for now..)
Any DX10- or GL 3.2-capable GPU can render to multiple layers at once.
You bind a bunch of layers at a time.
-ilia
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