Mesa (master): radeonsi: extract the VGT_GS_MODE calculation into its own function

[Nicolai Hähnle]

Module: Mesa
Branch: master
Commit: 9f89bd69df4a32eb1a7ebaf8bbd2c463f1a7882f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9f89bd69df4a32eb1a7ebaf8bbd2c463f1a7882f

Author: Nicolai Hähnle <nicolai.haehnle at amd.com>
Date:   Fri Jan 22 16:58:15 2016 -0500

radeonsi: extract the VGT_GS_MODE calculation into its own function

Cc: "11.0 11.1" <mesa-stable at lists.freedesktop.org>
Reviewed-by: Edward O'Callaghan <eocallaghan at alterapraxis.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/gallium/drivers/radeonsi/si_state_shaders.c | 47 +++++++++++++++----------
 1 file changed, 28 insertions(+), 19 deletions(-)

diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 79f2335..096f152 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -212,13 +212,37 @@ static void si_shader_es(struct si_shader *shader)
 		si_set_tesseval_regs(shader, pm4);
 }
 
+/**
+ * Calculate the appropriate setting of VGT_GS_MODE when \p shader is a
+ * geometry shader.
+ */
+static uint32_t si_vgt_gs_mode(struct si_shader *shader)
+{
+	unsigned gs_max_vert_out = shader->selector->gs_max_out_vertices;
+	unsigned cut_mode;
+
+	if (gs_max_vert_out <= 128) {
+		cut_mode = V_028A40_GS_CUT_128;
+	} else if (gs_max_vert_out <= 256) {
+		cut_mode = V_028A40_GS_CUT_256;
+	} else if (gs_max_vert_out <= 512) {
+		cut_mode = V_028A40_GS_CUT_512;
+	} else {
+		assert(gs_max_vert_out <= 1024);
+		cut_mode = V_028A40_GS_CUT_1024;
+	}
+
+	return S_028A40_MODE(V_028A40_GS_SCENARIO_G) |
+	       S_028A40_CUT_MODE(cut_mode)|
+	       S_028A40_ES_WRITE_OPTIMIZE(1) |
+	       S_028A40_GS_WRITE_OPTIMIZE(1);
+}
+
 static void si_shader_gs(struct si_shader *shader)
 {
 	unsigned gs_vert_itemsize = shader->selector->gsvs_vertex_size;
-	unsigned gs_max_vert_out = shader->selector->gs_max_out_vertices;
 	unsigned gsvs_itemsize = shader->selector->max_gsvs_emit_size >> 2;
 	unsigned gs_num_invocations = shader->selector->gs_num_invocations;
-	unsigned cut_mode;
 	struct si_pm4_state *pm4;
 	unsigned num_sgprs, num_user_sgprs;
 	uint64_t va;
@@ -232,22 +256,7 @@ static void si_shader_gs(struct si_shader *shader)
 	if (!pm4)
 		return;
 
-	if (gs_max_vert_out <= 128) {
-		cut_mode = V_028A40_GS_CUT_128;
-	} else if (gs_max_vert_out <= 256) {
-		cut_mode = V_028A40_GS_CUT_256;
-	} else if (gs_max_vert_out <= 512) {
-		cut_mode = V_028A40_GS_CUT_512;
-	} else {
-		assert(gs_max_vert_out <= 1024);
-		cut_mode = V_028A40_GS_CUT_1024;
-	}
-
-	si_pm4_set_reg(pm4, R_028A40_VGT_GS_MODE,
-		       S_028A40_MODE(V_028A40_GS_SCENARIO_G) |
-		       S_028A40_CUT_MODE(cut_mode)|
-		       S_028A40_ES_WRITE_OPTIMIZE(1) |
-		       S_028A40_GS_WRITE_OPTIMIZE(1));
+	si_pm4_set_reg(pm4, R_028A40_VGT_GS_MODE, si_vgt_gs_mode(shader));
 
 	si_pm4_set_reg(pm4, R_028A60_VGT_GSVS_RING_OFFSET_1, gsvs_itemsize);
 	si_pm4_set_reg(pm4, R_028A64_VGT_GSVS_RING_OFFSET_2, gsvs_itemsize * ((max_stream >= 2) ? 2 : 1));
@@ -255,7 +264,7 @@ static void si_shader_gs(struct si_shader *shader)
 
 	si_pm4_set_reg(pm4, R_028AB0_VGT_GSVS_RING_ITEMSIZE, gsvs_itemsize * (max_stream + 1));
 
-	si_pm4_set_reg(pm4, R_028B38_VGT_GS_MAX_VERT_OUT, gs_max_vert_out);
+	si_pm4_set_reg(pm4, R_028B38_VGT_GS_MAX_VERT_OUT, shader->selector->gs_max_out_vertices);
 
 	si_pm4_set_reg(pm4, R_028B5C_VGT_GS_VERT_ITEMSIZE, gs_vert_itemsize >> 2);
 	si_pm4_set_reg(pm4, R_028B60_VGT_GS_VERT_ITEMSIZE_1, (max_stream >= 1) ? gs_vert_itemsize >> 2 : 0);