i965/gen7: Enable support for fast color clears.

This patch adds code to place mcs_state into INTEL_MCS_STATE_RESOLVED
for miptrees that are capable of supporting fast color clears.  This
will have no effect on buffers that don't undergo a fast color clear;
however, for buffers that do undergo a fast color clear, an MCS
miptree will be allocated (at the time of the first fast clear), and
will be used thereafter.

Reviewed-by: Eric Anholt <eric@anholt.net>

diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
index 5b767df070fcb166281e7196df136cff69d7a7c8..1776a4b34c578d27b236e05fe2b3ec2e70c0d39c 100644 (file)
--- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
@@ -608,6 +608,16 @@ intel_miptree_create(struct intel_context *intel,
        return NULL;
    }
 
+#ifndef I915
+   /* If this miptree is capable of supporting fast color clears, set
+    * mcs_state appropriately to ensure that fast clears will occur.
+    * Allocation of the MCS miptree will be deferred until the first fast
+    * clear actually occurs.
+    */
+   if (intel_is_non_msrt_mcs_buffer_supported(intel, mt))
+      mt->mcs_state = INTEL_MCS_STATE_RESOLVED;
+#endif
+
    return mt;
 }
 
@@ -699,6 +709,16 @@ intel_miptree_create_for_dri2_buffer(struct intel_context *intel,
       return NULL;
    singlesample_mt->region->name = region->name;
 
+#ifndef I915
+   /* If this miptree is capable of supporting fast color clears, set
+    * mcs_state appropriately to ensure that fast clears will occur.
+    * Allocation of the MCS miptree will be deferred until the first fast
+    * clear actually occurs.
+    */
+   if (intel_is_non_msrt_mcs_buffer_supported(intel, singlesample_mt))
+      singlesample_mt->mcs_state = INTEL_MCS_STATE_RESOLVED;
+#endif
+
    if (num_samples == 0)
       return singlesample_mt;