[Mesa-dev] [PATCH 4/7] i965/blorp: Use R16_UNORM for Z32F surfaces.

[Kenneth Graunke]

Currently, all that matters is that we copy the correct number of bits,
so any format that has 32-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 (FLOAT).

For Z32F, this means using R32_FLOAT.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_blorp.cpp | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_blorp.cpp b/src/mesa/drivers/dri/i965/brw_blorp.cpp
index 46bb244..f71db4f 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/brw_blorp.cpp
@@ -86,15 +86,17 @@ brw_blorp_surface_info::set(struct brw_context *brw,
       this->brw_surfaceformat = BRW_SURFACEFORMAT_R8_UNORM;
       break;
    case MESA_FORMAT_X8_Z24:
-   case MESA_FORMAT_Z32_FLOAT:
-      /* The miptree consists of 32 bits per pixel, arranged either as 24-bit
-       * depth values interleaved with 8 "don't care" bits, or as 32-bit
-       * floating point depth values.  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 it as 8-bit BGRA.
+      /* The miptree consists of 32 bits per pixel, arranged as 24-bit depth
+       * values interleaved with 8 "don't care" bits.  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 it
+       * as 8-bit BGRA.
        */
       this->brw_surfaceformat = BRW_SURFACEFORMAT_B8G8R8A8_UNORM;
       break;
+   case MESA_FORMAT_Z32_FLOAT:
+      this->brw_surfaceformat = BRW_SURFACEFORMAT_R32_FLOAT;
+      break;
    case MESA_FORMAT_Z16:
       this->brw_surfaceformat = BRW_SURFACEFORMAT_R16_UNORM;
       break;
-- 
1.8.3.2