Mesa (master): i965: Support allocating the MCS buffer for 16x MSAA

[Neil Roberts]

Module: Mesa
Branch: master
Commit: bf6bd7eaf09fadc516a1e46635ed8590f4d88535
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=bf6bd7eaf09fadc516a1e46635ed8590f4d88535

Author: Neil Roberts <neil at linux.intel.com>
Date:   Wed Sep  9 14:38:08 2015 +0100

i965: Support allocating the MCS buffer for 16x MSAA

When 16 samples are used the MCS buffer needs 64 bits per pixel.

Reviewed-by: Ben Widawsky <ben at bwidawsk.net>

---

 src/mesa/drivers/dri/i965/intel_mipmap_tree.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 0802b92..b1a7632 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -1427,6 +1427,12 @@ intel_miptree_alloc_mcs(struct brw_context *brw,
        */
       format = MESA_FORMAT_R_UINT32;
       break;
+   case 16:
+      /* 64 bits/pixel are required for MCS data when using 16x MSAA (4 bits
+       * for each sample).
+       */
+      format = MESA_FORMAT_RG_UINT32;
+      break;
    default:
       unreachable("Unrecognized sample count in intel_miptree_alloc_mcs");
    };