From: Marek Olšák <marek.olsak@amd.com>
Date: Sun, 7 Dec 2014 19:14:41 +0000 (+0100)
Subject: radeonsi: emit primitive restart only if it changes
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=34350131ded27e7584cfde273675a9a99b1ba7db;p=mesa.git

radeonsi: emit primitive restart only if it changes

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
---

diff --git a/src/gallium/drivers/radeonsi/si_hw_context.c b/src/gallium/drivers/radeonsi/si_hw_context.c
index 6c2734eac29..0bbc381bc9c 100644
--- a/src/gallium/drivers/radeonsi/si_hw_context.c
+++ b/src/gallium/drivers/radeonsi/si_hw_context.c
@@ -156,4 +156,6 @@ void si_begin_new_cs(struct si_context *ctx)
 
 	ctx->b.initial_gfx_cs_size = ctx->b.rings.gfx.cs->cdw;
 	si_invalidate_draw_sh_constants(ctx);
+	ctx->last_primitive_restart_en = -1;
+	ctx->last_restart_index = SI_RESTART_INDEX_UNKNOWN;
 }
diff --git a/src/gallium/drivers/radeonsi/si_pipe.h b/src/gallium/drivers/radeonsi/si_pipe.h
index e3cc09a0b85..471a55440d6 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.h
+++ b/src/gallium/drivers/radeonsi/si_pipe.h
@@ -34,10 +34,11 @@
 #define SI_BIG_ENDIAN 0
 #endif
 
-/* The base vertex can be any number, but we must pick one which
- * will mean "unknown" for the purpose of state tracking and the number
- * shouldn't be a commonly-used one. */
+/* The base vertex and primitive restart can be any number, but we must pick
+ * one which will mean "unknown" for the purpose of state tracking and
+ * the number shouldn't be a commonly-used one. */
 #define SI_BASE_VERTEX_UNKNOWN INT_MIN
+#define SI_RESTART_INDEX_UNKNOWN INT_MIN
 
 #define SI_TRACE_CS 0
 #define SI_TRACE_CS_DWORDS		6
@@ -179,6 +180,8 @@ struct si_context {
 	int			last_base_vertex;
 	int			last_start_instance;
 	int			last_sh_base_reg;
+	int			last_primitive_restart_en;
+	int			last_restart_index;
 };
 
 /* si_blit.c */
diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index f9ff0e34c17..40a55c50fe9 100644
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -193,8 +193,20 @@ static void si_emit_draw_registers(struct si_context *sctx,
 	}
 
 	r600_write_context_reg(cs, R_028A6C_VGT_GS_OUT_PRIM_TYPE, gs_out_prim);
-	r600_write_context_reg(cs, R_02840C_VGT_MULTI_PRIM_IB_RESET_INDX, info->restart_index);
-	r600_write_context_reg(cs, R_028A94_VGT_MULTI_PRIM_IB_RESET_EN, info->primitive_restart);
+
+	/* Primitive restart. */
+	if (info->primitive_restart != sctx->last_primitive_restart_en) {
+		r600_write_context_reg(cs, R_028A94_VGT_MULTI_PRIM_IB_RESET_EN, info->primitive_restart);
+		sctx->last_primitive_restart_en = info->primitive_restart;
+
+		if (info->primitive_restart &&
+		    (info->restart_index != sctx->last_restart_index ||
+		     sctx->last_restart_index == SI_RESTART_INDEX_UNKNOWN)) {
+			r600_write_context_reg(cs, R_02840C_VGT_MULTI_PRIM_IB_RESET_INDX,
+					       info->restart_index);
+			sctx->last_restart_index = info->restart_index;
+		}
+	}
 }
 
 static void si_emit_draw_packets(struct si_context *sctx,