[Mesa-dev] [PATCH 3/4] i965/miptree: Add support for partially resolving MCS

[Jason Ekstrand]

---
 src/mesa/drivers/dri/i965/brw_blorp.c         | 24 ++++++++++++++++
 src/mesa/drivers/dri/i965/brw_blorp.h         |  5 ++++
 src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 40 +++++++++++++++++++++++++--
 3 files changed, 67 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_blorp.c b/src/mesa/drivers/dri/i965/brw_blorp.c
index 87c9dd4..5744a9c 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp.c
+++ b/src/mesa/drivers/dri/i965/brw_blorp.c
@@ -1060,6 +1060,30 @@ brw_blorp_resolve_color(struct brw_context *brw, struct intel_mipmap_tree *mt,
    brw_emit_end_of_pipe_sync(brw, PIPE_CONTROL_RENDER_TARGET_FLUSH);
 }
 
+void
+brw_blorp_mcs_partial_resolve(struct brw_context *brw,
+                              struct intel_mipmap_tree *mt,
+                              uint32_t start_layer, uint32_t num_layers)
+{
+   DBG("%s to mt %p layers %u-%u\n", __FUNCTION__, mt,
+       start_layer, start_layer + num_layers - 1);
+
+   const mesa_format format = _mesa_get_srgb_format_linear(mt->format);
+   enum isl_format isl_format = brw_blorp_to_isl_format(brw, format, true);
+
+   struct isl_surf isl_tmp[1];
+   struct blorp_surf surf;
+   uint32_t level = 0;
+   blorp_surf_for_miptree(brw, &surf, mt, true, false, 0,
+                          &level, start_layer, num_layers, isl_tmp);
+
+   struct blorp_batch batch;
+   blorp_batch_init(&brw->blorp, &batch, brw, 0);
+   blorp_mcs_partial_resolve(&batch, &surf, isl_format,
+                             start_layer, num_layers);
+   blorp_batch_finish(&batch);
+}
+
 /**
  * Perform a HiZ or depth resolve operation.
  *
diff --git a/src/mesa/drivers/dri/i965/brw_blorp.h b/src/mesa/drivers/dri/i965/brw_blorp.h
index 29d5788..c65a68a 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp.h
+++ b/src/mesa/drivers/dri/i965/brw_blorp.h
@@ -74,6 +74,11 @@ brw_blorp_resolve_color(struct brw_context *brw,
                         enum blorp_fast_clear_op resolve_op);
 
 void
+brw_blorp_mcs_partial_resolve(struct brw_context *brw,
+                              struct intel_mipmap_tree *mt,
+                              uint32_t start_layer, uint32_t num_layers);
+
+void
 intel_hiz_exec(struct brw_context *brw, struct intel_mipmap_tree *mt,
                unsigned int level, unsigned int start_layer,
                unsigned int num_layers, enum blorp_hiz_op op);
diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 75e192a..c94fb4f 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -2147,6 +2147,35 @@ intel_miptree_finish_ccs_write(struct brw_context *brw,
 }
 
 static void
+intel_miptree_prepare_mcs_access(struct brw_context *brw,
+                                 struct intel_mipmap_tree *mt,
+                                 uint32_t layer,
+                                 bool mcs_supported,
+                                 bool fast_clear_supported)
+{
+   switch (intel_miptree_get_aux_state(mt, 0, layer)) {
+   case ISL_AUX_STATE_CLEAR:
+   case ISL_AUX_STATE_COMPRESSED_CLEAR:
+      assert(mcs_supported);
+      if (!fast_clear_supported) {
+         brw_blorp_mcs_partial_resolve(brw, mt, layer, 1);
+         intel_miptree_set_aux_state(brw, mt, 0, layer, 1,
+                                     ISL_AUX_STATE_COMPRESSED_NO_CLEAR);
+      }
+      break;
+
+   case ISL_AUX_STATE_COMPRESSED_NO_CLEAR:
+      assert(mcs_supported);
+      break; /* Nothing to do */
+
+   case ISL_AUX_STATE_RESOLVED:
+   case ISL_AUX_STATE_PASS_THROUGH:
+   case ISL_AUX_STATE_AUX_INVALID:
+      unreachable("Invalid aux state for MCS");
+   }
+}
+
+static void
 intel_miptree_finish_mcs_write(struct brw_context *brw,
                                struct intel_mipmap_tree *mt,
                                uint32_t layer,
@@ -2160,10 +2189,10 @@ intel_miptree_finish_mcs_write(struct brw_context *brw,
       break;
 
    case ISL_AUX_STATE_COMPRESSED_CLEAR:
+   case ISL_AUX_STATE_COMPRESSED_NO_CLEAR:
       assert(written_with_mcs);
       break; /* Nothing to do */
 
-   case ISL_AUX_STATE_COMPRESSED_NO_CLEAR:
    case ISL_AUX_STATE_RESOLVED:
    case ISL_AUX_STATE_PASS_THROUGH:
    case ISL_AUX_STATE_AUX_INVALID:
@@ -2317,7 +2346,14 @@ intel_miptree_prepare_access(struct brw_context *brw,
 
       if (mt->num_samples > 1) {
          /* Nothing to do for MSAA */
-         assert(aux_supported && fast_clear_supported);
+         assert(start_level == 0 && num_levels == 1);
+         const uint32_t level_layers =
+            miptree_layer_range_length(mt, 0, start_layer, num_layers);
+         for (uint32_t a = 0; a < level_layers; a++) {
+            intel_miptree_prepare_mcs_access(brw, mt, start_layer + a,
+                                             aux_supported,
+                                             fast_clear_supported);
+         }
       } else {
          for (uint32_t l = 0; l < num_levels; l++) {
             const uint32_t level = start_level + l;
-- 
2.5.0.400.gff86faf