Mesa (master): freedreno/a6xx: Implement PrimID passthrough

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Module: Mesa
Branch: master
Commit: a64d2661340a659bdd0b729090b3aa6c135e8b4c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a64d2661340a659bdd0b729090b3aa6c135e8b4c

Author: Connor Abbott <cwabbott0 at gmail.com>
Date:   Thu Apr 23 11:56:07 2020 +0200

freedreno/a6xx: Implement PrimID passthrough

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4704>

---

 src/gallium/drivers/freedreno/a6xx/fd6_emit.c    |  1 -
 src/gallium/drivers/freedreno/a6xx/fd6_program.c | 11 +++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/gallium/drivers/freedreno/a6xx/fd6_emit.c b/src/gallium/drivers/freedreno/a6xx/fd6_emit.c
index 59c2d15a266..9295175404d 100644
--- a/src/gallium/drivers/freedreno/a6xx/fd6_emit.c
+++ b/src/gallium/drivers/freedreno/a6xx/fd6_emit.c
@@ -1302,7 +1302,6 @@ fd6_emit_restore(struct fd_batch *batch, struct fd_ringbuffer *ring)
 
 	WRITE(REG_A6XX_VPC_SO_OVERRIDE, A6XX_VPC_SO_OVERRIDE_SO_DISABLE);
 
-	WRITE(REG_A6XX_PC_PRIMID_CNTL, 0);
 	WRITE(REG_A6XX_PC_UNKNOWN_9990, 0);
 	WRITE(REG_A6XX_PC_UNKNOWN_9980, 0);
 
diff --git a/src/gallium/drivers/freedreno/a6xx/fd6_program.c b/src/gallium/drivers/freedreno/a6xx/fd6_program.c
index 9e12cb246c9..6e19deee03e 100644
--- a/src/gallium/drivers/freedreno/a6xx/fd6_program.c
+++ b/src/gallium/drivers/freedreno/a6xx/fd6_program.c
@@ -431,6 +431,8 @@ setup_stateobj(struct fd_ringbuffer *ring, struct fd_screen *screen,
 	const struct ir3_shader_variant *last_shader = fd6_last_shader(state);
 	ir3_link_shaders(&l, last_shader, fs, true);
 
+	bool primid_passthru = l.primid_loc != 0xff;
+
 	OUT_PKT4(ring, REG_A6XX_VPC_VAR_DISABLE(0), 4);
 	OUT_RING(ring, ~l.varmask[0]);  /* VPC_VAR[0].DISABLE */
 	OUT_RING(ring, ~l.varmask[1]);  /* VPC_VAR[1].DISABLE */
@@ -590,7 +592,8 @@ setup_stateobj(struct fd_ringbuffer *ring, struct fd_screen *screen,
 	OUT_PKT4(ring, REG_A6XX_VPC_CNTL_0, 1);
 	OUT_RING(ring, A6XX_VPC_CNTL_0_NUMNONPOSVAR(fs->total_in) |
 			 COND(enable_varyings, A6XX_VPC_CNTL_0_VARYING) |
-			 0xff00ff00);
+			 A6XX_VPC_CNTL_0_PRIMIDLOC(l.primid_loc) |
+			 A6XX_VPC_CNTL_0_UNKLOC(0xff));
 
 	OUT_PKT4(ring, REG_A6XX_PC_PRIMITIVE_CNTL_1, 1);
 	OUT_RING(ring, A6XX_PC_PRIMITIVE_CNTL_1_STRIDE_IN_VPC(l.max_loc) |
@@ -786,6 +789,9 @@ setup_stateobj(struct fd_ringbuffer *ring, struct fd_screen *screen,
 	if (fs->instrlen)
 		fd6_emit_shader(ring, fs);
 
+	OUT_PKT4(ring, REG_A6XX_PC_PRIMID_CNTL, 1);
+	OUT_RING(ring, COND(primid_passthru, A6XX_PC_PRIMID_CNTL_PRIMID_PASSTHRU));
+
 	OUT_PKT4(ring, REG_A6XX_VFD_CONTROL_1, 6);
 	OUT_RING(ring, A6XX_VFD_CONTROL_1_REGID4VTX(vertex_regid) |
 			A6XX_VFD_CONTROL_1_REGID4INST(instance_regid) |
@@ -800,7 +806,8 @@ setup_stateobj(struct fd_ringbuffer *ring, struct fd_screen *screen,
 	OUT_RING(ring, 0x000000fc);   /* VFD_CONTROL_4 */
 	OUT_RING(ring, A6XX_VFD_CONTROL_5_REGID_GSHEADER(gs_header_regid) |
 			0xfc00);   /* VFD_CONTROL_5 */
-	OUT_RING(ring, 0x00000000);   /* VFD_CONTROL_6 */
+	OUT_RING(ring,
+			 COND(primid_passthru, A6XX_VFD_CONTROL_6_PRIMID_PASSTHRU));   /* VFD_CONTROL_6 */
 
 	bool fragz = fs->no_earlyz | fs->writes_pos;