i965/gen9: Optimize slice and subslice load balancing behavior.

[mesa.git] / src / mesa / drivers / dri / i965 / gen7_sol_state.c

diff --git a/src/mesa/drivers/dri/i965/gen7_sol_state.c b/src/mesa/drivers/dri/i965/gen7_sol_state.c
index 299e650731ed39400cd051980ba69208aa116ee9..3801c73f654a136265ce43339c87c633d6e7dd7f 100644 (file)
--- a/src/mesa/drivers/dri/i965/gen7_sol_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_sol_state.c
@@ -45,17 +45,6 @@ gen7_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
 
    assert(brw->screen->devinfo.gen == 7);
 
-   /* We're about to lose the information needed to compute the number of
-    * vertices written during the last Begin/EndTransformFeedback section,
-    * so we can't delay it any further.
-    */
-   brw_compute_xfb_vertices_written(brw, brw_obj);
-
-   /* No primitives have been generated yet. */
-   for (int i = 0; i < BRW_MAX_XFB_STREAMS; i++) {
-      brw_obj->prims_generated[i] = 0;
-   }
-
    /* Store the starting value of the SO_NUM_PRIMS_WRITTEN counters. */
    brw_save_primitives_written_counters(brw, brw_obj);
 
@@ -65,11 +54,7 @@ gen7_begin_transform_feedback(struct gl_context *ctx, GLenum mode,
       brw->batch.needs_sol_reset = true;
    } else {
       for (int i = 0; i < 4; i++) {
-         BEGIN_BATCH(3);
-         OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
-         OUT_BATCH(GEN7_SO_WRITE_OFFSET(i));
-         OUT_BATCH(0);
-         ADVANCE_BATCH();
+         brw_load_register_imm32(brw, GEN7_SO_WRITE_OFFSET(i), 0);
       }
    }
 
@@ -94,6 +79,14 @@ gen7_end_transform_feedback(struct gl_context *ctx,
    if (!obj->Paused)
       brw_save_primitives_written_counters(brw, brw_obj);
 
+   /* We've reached the end of a transform feedback begin/end block.  This
+    * means that future DrawTransformFeedback() calls will need to pick up the
+    * results of the current counter, and that it's time to roll back the
+    * current primitive counter to zero.
+    */
+   brw_obj->previous_counter = brw_obj->counter;
+   brw_reset_transform_feedback_counter(&brw_obj->counter);
+
    /* EndTransformFeedback() means that we need to update the number of
     * vertices written.  Since it's only necessary if DrawTransformFeedback()
     * is called and it means mapping a buffer object, we delay computing it