Fixes the following OGLConform tests on gen5:
depth-stencil(misc.state_on.depth_int)
fbo_db_ARBfp(basic.OnlyDepthBuffDrawBufferRender)
The problem was that, if the depth buffer's Mesa format was X8_Z24, then
we emitted the hardware format D24_UNORM_X8. But, on gen5, D24_UNORM_S8
must be emitted.
This bug was introduced by:
commit d84a180417d1eabd680554970f1eaaa93abcd41e
Author: Eric Anholt <[email protected]>
i965: Base HW depth format setup based on MESA_FORMAT, not bpp.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=43408
Reported-by: [email protected]
Note: This is a candidate for the 8.0 branch.
Signed-off-by: Chad Versace <[email protected]>
---
src/mesa/drivers/dri/i965/brw_misc_state.c | 16 +++++++++++++---
1 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_misc_state.c
b/src/mesa/drivers/dri/i965/brw_misc_state.c
index b6bca4b..852c770 100644
--- a/src/mesa/drivers/dri/i965/brw_misc_state.c
+++ b/src/mesa/drivers/dri/i965/brw_misc_state.c
@@ -223,10 +223,20 @@ brw_depthbuffer_format(struct brw_context *brw)
case MESA_FORMAT_Z32_FLOAT:
return BRW_DEPTHFORMAT_D32_FLOAT;
case MESA_FORMAT_X8_Z24:
- if (intel->gen >= 5)
- return BRW_DEPTHFORMAT_D24_UNORM_X8_UINT;
- else /* Gen4 doesn't support X8; use S8 instead. */
+ if (brw->intel.gen < 6) {
+ /* Use D24_UNORM_S8, not D24_UNORM_X8.
+ *
+ * D24_UNORM_X8 was not introduced until Gen5 (See field
+ * 3DSTATE_DEPTH_BUFFER.Surface_Format in the PRM).
+ *
+ * However, on Gen5, D24_UNORM_X8 may be used only if separate
+ * stencil is enabled, and we never enable it. (See field
+ * 3DSTATE_DEPTH_BUFFER.Separate_Stencil_Buffer_Enable),
+ */
return BRW_DEPTHFORMAT_D24_UNORM_S8_UINT;
+ } else {
+ return BRW_DEPTHFORMAT_D24_UNORM_X8_UINT;
+ }
case MESA_FORMAT_S8_Z24:
return BRW_DEPTHFORMAT_D24_UNORM_S8_UINT;
case MESA_FORMAT_Z32_FLOAT_X24S8:
--
1.7.7.4
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