intel/isl: Add support to emit clear value address.

gen10 can emit the clear color by setting it on a buffer somewhere, and
then adding only the address to the surface state.

This commit add support for that on isl_surf_fill_state, and if that is
requested, skip setting the clear value itself.

v2: Add assert to make sure we are at least on gen10.

Signed-off-by: Rafael Antognolli <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

2 files changed, 23 insertions, 4 deletions

diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index 2edf0522e32..c50b78d4701 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1308,6 +1308,15 @@ struct isl_surf_fill_state_info {
    union isl_color_value clear_color;
 
    /**
+    * Send only the clear value address
+    *
+    * If set, we only pass the clear address to the GPU and it will fetch it
+    * from wherever it is.
+    */
+   bool use_clear_address;
+   uint64_t clear_address;
+
+   /**
     * Surface write disables for gen4-5
     */
    isl_channel_mask_t write_disables;
diff --git a/src/intel/isl/isl_surface_state.c b/src/intel/isl/isl_surface_state.c
index 32a5429f2bf..bff9693f02d 100644
--- a/src/intel/isl/isl_surface_state.c
+++ b/src/intel/isl/isl_surface_state.c
@@ -637,11 +637,21 @@ isl_genX(surf_fill_state_s)(const struct isl_device *dev, void *state,
 #endif
 
    if (info->aux_usage != ISL_AUX_USAGE_NONE) {
+      if (info->use_clear_address) {
+#if GEN_GEN >= 10
+         s.ClearValueAddressEnable = true;
+         s.ClearValueAddress = info->clear_address;
+#else
+         unreachable("Gen9 and earlier do not support indirect clear colors");
+#endif
+      }
 #if GEN_GEN >= 9
-      s.RedClearColor = info->clear_color.u32[0];
-      s.GreenClearColor = info->clear_color.u32[1];
-      s.BlueClearColor = info->clear_color.u32[2];
-      s.AlphaClearColor = info->clear_color.u32[3];
+      if (!info->use_clear_address) {
+         s.RedClearColor = info->clear_color.u32[0];
+         s.GreenClearColor = info->clear_color.u32[1];
+         s.BlueClearColor = info->clear_color.u32[2];
+         s.AlphaClearColor = info->clear_color.u32[3];
+      }
 #elif GEN_GEN >= 7
       /* Prior to Sky Lake, we only have one bit for the clear color which
        * gives us 0 or 1 in whatever the surface's format happens to be.