Mesa (8.0): i965: Support MESA_FORMAT_SIGNED_RGBA_16.

[Ian Romanick]

Module: Mesa
Branch: 8.0
Commit: a85dd5712f22e62de09f6e72715f926414d79f3b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a85dd5712f22e62de09f6e72715f926414d79f3b

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sat Jun  9 02:33:22 2012 -0700

i965: Support MESA_FORMAT_SIGNED_RGBA_16.

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.

Fixes 6 piglit texwrap-2D-*SNORM* cases,
gl-3.1/required-sized-texture-formats, and 10 oglconform snorm-textures
subcases

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Eric Anholt <eric at anholt.net>
(cherry picked from commit f56dfc32134d65599159f53215713bf372c51a13)

---

 src/mesa/drivers/dri/i965/brw_wm_surface_state.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 93a0550..9cce568 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -428,7 +428,7 @@ brw_format_for_mesa_format(gl_format mesa_format)
       [MESA_FORMAT_SIGNED_R16] = BRW_SURFACEFORMAT_R16_SNORM,
       [MESA_FORMAT_SIGNED_GR1616] = BRW_SURFACEFORMAT_R16G16_SNORM,
       [MESA_FORMAT_SIGNED_RGB_16] = 0,
-      [MESA_FORMAT_SIGNED_RGBA_16] = 0,
+      [MESA_FORMAT_SIGNED_RGBA_16] = BRW_SURFACEFORMAT_R16G16B16A16_SNORM,
       [MESA_FORMAT_RGBA_16] = BRW_SURFACEFORMAT_R16G16B16A16_UNORM,
 
       [MESA_FORMAT_RED_RGTC1] = BRW_SURFACEFORMAT_BC4_UNORM,