Mesa (master): i965/blorp: Use R16_UNORM for Z16 surfaces.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 4dc25b761553215a686650c6bcb8831ef0c9120d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=4dc25b761553215a686650c6bcb8831ef0c9120d

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Mon Oct  7 11:08:27 2013 -0700

i965/blorp: Use R16_UNORM for Z16 surfaces.

Currently, all that matters is that we copy the correct number of bits,
so any format that has 16-bits of data will work fine.

Once BLORP begins handling format conversions, the sampler will need to
correctly interpret the data.  We don't need a depth format, but we do
need the right number of components and data type (UNORM).

For Z16, this means using R16_UNORM.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Chad Versace <chad.versace at linux.intel.com>
Reviewed-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>

---

 src/mesa/drivers/dri/i965/brw_blorp.cpp |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_blorp.cpp b/src/mesa/drivers/dri/i965/brw_blorp.cpp
index f5731b6..46bb244 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/brw_blorp.cpp
@@ -96,12 +96,7 @@ brw_blorp_surface_info::set(struct brw_context *brw,
       this->brw_surfaceformat = BRW_SURFACEFORMAT_B8G8R8A8_UNORM;
       break;
    case MESA_FORMAT_Z16:
-      /* The miptree consists of 16 bits per pixel of depth data.  Since depth
-       * values don't require any blending, it doesn't matter how we interpret
-       * the bit pattern as long as we copy the right amount of data, so just
-       * map is as 8-bit RG.
-       */
-      this->brw_surfaceformat = BRW_SURFACEFORMAT_R8G8_UNORM;
+      this->brw_surfaceformat = BRW_SURFACEFORMAT_R16_UNORM;
       break;
    default:
       if (is_render_target) {