[Mesa-dev] [PATCH 1/2] i965: Don't flush the batch at the end of blorp.

[Eric Anholt]

Improves GLB2.7 performance 0.13% +/- 0.09% (n=104/105, outliers removed).
More importantly, once color glClear()s are done through blorp in the next
commit, this reduces regression in GLES3 conformance tests that rely on
queueing up many glClear()s and having the GPU report being still busy in
an ARB_sync query after that.
---
 src/mesa/drivers/dri/i965/brw_blorp.cpp  |   19 +++++++++++++++++++
 src/mesa/drivers/dri/i965/gen6_blorp.cpp |    9 ---------
 src/mesa/drivers/dri/i965/gen7_blorp.cpp |    9 ---------
 3 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_blorp.cpp b/src/mesa/drivers/dri/i965/brw_blorp.cpp
index c60f4f1..8a044c1 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/brw_blorp.cpp
@@ -21,6 +21,7 @@
  * IN THE SOFTWARE.
  */
 
+#include "intel_batchbuffer.h"
 #include "intel_fbo.h"
 
 #include "brw_blorp.h"
@@ -163,6 +164,8 @@ intel_hiz_exec(struct intel_context *intel, struct intel_mipmap_tree *mt,
 void
 brw_blorp_exec(struct intel_context *intel, const brw_blorp_params *params)
 {
+   struct brw_context *brw = brw_context(&intel->ctx);
+
    switch (intel->gen) {
    case 6:
       gen6_blorp_exec(intel, params);
@@ -175,6 +178,22 @@ brw_blorp_exec(struct intel_context *intel, const brw_blorp_params *params)
       assert(false);
       break;
    }
+
+   if (unlikely(intel->always_flush_batch))
+      intel_batchbuffer_flush(intel);
+
+   /* We've smashed all state compared to what the normal 3D pipeline
+    * rendering tracks for GL.
+    */
+   brw->state.dirty.brw = ~0;
+   brw->state.dirty.cache = ~0;
+   brw->state_batch_count = 0;
+   intel->batch.need_workaround_flush = true;
+
+   /* Flush the sampler cache so any texturing from the destination is
+    * coherent.
+    */
+   intel_batchbuffer_emit_mi_flush(intel);
 }
 
 brw_hiz_op_params::brw_hiz_op_params(struct intel_mipmap_tree *mt,
diff --git a/src/mesa/drivers/dri/i965/gen6_blorp.cpp b/src/mesa/drivers/dri/i965/gen6_blorp.cpp
index b6fbd44..872c408 100644
--- a/src/mesa/drivers/dri/i965/gen6_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/gen6_blorp.cpp
@@ -1093,14 +1093,5 @@ gen6_blorp_exec(struct intel_context *intel,
    gen6_blorp_emit_clear_params(brw, params);
    gen6_blorp_emit_drawing_rectangle(brw, params);
    gen6_blorp_emit_primitive(brw, params);
-
-   /* See comments above at first invocation of intel_flush() in
-    * gen6_blorp_emit_batch_head().
-    */
-   intel_flush(ctx);
-
-   /* Be safe. */
-   brw->state.dirty.brw = ~0;
-   brw->state.dirty.cache = ~0;
 }
 
diff --git a/src/mesa/drivers/dri/i965/gen7_blorp.cpp b/src/mesa/drivers/dri/i965/gen7_blorp.cpp
index 290ad35..99e7e58 100644
--- a/src/mesa/drivers/dri/i965/gen7_blorp.cpp
+++ b/src/mesa/drivers/dri/i965/gen7_blorp.cpp
@@ -807,13 +807,4 @@ gen7_blorp_exec(struct intel_context *intel,
    gen7_blorp_emit_clear_params(brw, params);
    gen6_blorp_emit_drawing_rectangle(brw, params);
    gen7_blorp_emit_primitive(brw, params);
-
-   /* See comments above at first invocation of intel_flush() in
-    * gen6_blorp_emit_batch_head().
-    */
-   intel_flush(ctx);
-
-   /* Be safe. */
-   brw->state.dirty.brw = ~0;
-   brw->state.dirty.cache = ~0;
 }
-- 
1.7.10.4