[Mesa-dev] [PATCH 3/3] i965: Support MESA_FORMAT_SIGNED_RGBA_16.

[Eric Anholt]

On Sat,  9 Jun 2012 02:33:22 -0700, Kenneth Graunke <kenneth at whitecape.org> wrote:
> The hardware supports this format with no known quirks, so we may as
> well enable it.
> 
> Alpha blending is not supported until Sandybridge, but as far as I can
> tell, OpenGL doesn't require alpha blending on SNORM formats.  Plus, we
> already expose R8G8B8A8_SNORM which has a similar restriction.
> 
> +10 oglconform snorm-textures subcases
> 
> Cc: Eric Anholt <eric at anholt.net>
> Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>

Right, GL 3.1 core spec page 119 says that the snorms are required only
for texturing, not for rendering, and the EXT_texture_snorm spec doesn't
expect them to be necessarily supported for rendering in the issues.
The brw_wm_surface_state.c table should prevent rendering to both of
these due to the blending limitation when appropriate.

This patch is

Reviewed-by: Eric Anholt <eric at anholt.net>
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