isl: Add isl_surf_supports_hiz_ccs_wt()

Add a helper to determine if an ISL surface supports the write-through
mode of HIZ_CCS.

Reviewed-by: Sagar Ghuge <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

2 files changed, 18 insertions, 0 deletions

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index 954c7102b80..c756fb0c80f 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -2583,6 +2583,16 @@ isl_surf_get_depth_format(const struct isl_device *dev,
 }
 
 bool
+isl_surf_supports_hiz_ccs_wt(const struct gen_device_info *dev,
+                             const struct isl_surf *surf,
+                             enum isl_aux_usage aux_usage)
+{
+   return aux_usage == ISL_AUX_USAGE_HIZ_CCS &&
+          surf->samples == 1 &&
+          surf->usage & ISL_SURF_USAGE_TEXTURE_BIT;
+}
+
+bool
 isl_swizzle_supports_rendering(const struct gen_device_info *devinfo,
                                struct isl_swizzle swizzle)
 {
diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index d50f86f6892..bcb46b12266 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -2163,6 +2163,14 @@ isl_surf_get_depth_format(const struct isl_device *dev,
                           const struct isl_surf *surf);
 
 /**
+ * @brief determines if a surface supports writing through HIZ to the CCS.
+ */
+bool
+isl_surf_supports_hiz_ccs_wt(const struct gen_device_info *dev,
+                             const struct isl_surf *surf,
+                             enum isl_aux_usage aux_usage);
+
+/**
  * @brief performs a copy from linear to tiled surface
  *
  */