[Mesa-dev] [PATCH 4/4] intel: Support native Z16 depth textures (including as renderbuffer) on i965.

[Eric Anholt]

On Fri, 11 Nov 2011 14:09:51 -0800, Ian Romanick <idr at freedesktop.org> wrote:
> On 11/11/2011 10:57 AM, Eric Anholt wrote:
> > This is required for GL 3.0.  The old comment about Z24 is dropped,
> > since we support X8_Z24 now.
> > ---
> >   src/mesa/drivers/dri/intel/intel_context.c |   13 ++-----------
> >   1 files changed, 2 insertions(+), 11 deletions(-)
> >
> > diff --git a/src/mesa/drivers/dri/intel/intel_context.c b/src/mesa/drivers/dri/intel/intel_context.c
> > index d00d5d4..4ee7e35 100644
> > --- a/src/mesa/drivers/dri/intel/intel_context.c
> > +++ b/src/mesa/drivers/dri/intel/intel_context.c
> > @@ -648,21 +648,12 @@ intelInitContext(struct intel_context *intel,
> >      }
> >
> >      /* Depth and stencil */
> > +   if (intel->gen>= 4)
> > +      ctx->TextureFormatSupported[MESA_FORMAT_Z16] = true;
> 
> Why is this restricted to GEN4+?  i915 can do 16-bit depth, and it looks 
> like it can handle 16-bit textures.

i915 had all sorts of restrictions on using 16-bit depth as I recall.
I wouldn't do it without testing.

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