Mesa (master): intel/isl: Rework the asserts and fails in isl_surf_get_ccs

[Jason Ekstrand]

Module: Mesa
Branch: master
Commit: 26c8bb7bc056ee2e5795fa34bcb2a666554b09dd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=26c8bb7bc056ee2e5795fa34bcb2a666554b09dd

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Wed Sep 21 04:03:27 2016 -0700

intel/isl: Rework the asserts and fails in isl_surf_get_ccs

There are some invariants such as number of samples on which we should
assert.  However, most other things should silently return false since
they're much easier for isl_surf_get_ccs to check than the caller.  We also
update the checking to be a bit more complete.

---

 src/intel/isl/isl.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index 658650b..4d85c3b 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -1448,9 +1448,14 @@ isl_surf_get_ccs_surf(const struct isl_device *dev,
    assert(surf->samples == 1 && surf->msaa_layout == ISL_MSAA_LAYOUT_NONE);
    assert(ISL_DEV_GEN(dev) >= 7);
 
-   assert(ISL_DEV_GEN(dev) >= 8 || surf->dim == ISL_SURF_DIM_2D);
+   if (surf->usage & ISL_SURF_USAGE_DISABLE_AUX_BIT)
+      return false;
 
-   assert(surf->logical_level0_px.depth == 1);
+   if (ISL_DEV_GEN(dev) <= 8 && surf->dim != ISL_SURF_DIM_2D)
+      return false;
+
+   if (isl_format_is_compressed(surf->format))
+      return false;
 
    /* TODO: More conditions where it can fail. */