[Mesa-dev] [PATCH 12/12] i965/gen7: Enable support for fast color clears.

[Paul Berry]

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.
---
 src/mesa/drivers/dri/intel/intel_mipmap_tree.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
index 7a3c135..5b9771f 100644
--- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
@@ -602,6 +602,16 @@ 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;
 }
 
@@ -657,6 +667,16 @@ intel_miptree_create_for_dri2_buffer(struct intel_context *intel,
    if (!singlesample_mt)
       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, singlesample_mt))
+      singlesample_mt->mcs_state = INTEL_MCS_STATE_RESOLVED;
+#endif
+
    if (num_samples == 0)
       return singlesample_mt;
 
-- 
1.8.2.3