[Mesa-dev] [PATCH 17/27] radeonsi: set up a ring buffer for tessellation factors

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

---
 src/gallium/drivers/radeonsi/si_pipe.c          |  2 ++
 src/gallium/drivers/radeonsi/si_pipe.h          |  2 ++
 src/gallium/drivers/radeonsi/si_state.h         |  1 +
 src/gallium/drivers/radeonsi/si_state_shaders.c | 37 +++++++++++++++++++++++++
 4 files changed, 42 insertions(+)

diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index d480fcc..f77a901 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -42,12 +42,14 @@ static void si_destroy_context(struct pipe_context *context)
 
 	pipe_resource_reference(&sctx->esgs_ring, NULL);
 	pipe_resource_reference(&sctx->gsvs_ring, NULL);
+	pipe_resource_reference(&sctx->tf_ring, NULL);
 	pipe_resource_reference(&sctx->null_const_buf.buffer, NULL);
 	r600_resource_reference(&sctx->border_color_table, NULL);
 	r600_resource_reference(&sctx->scratch_buffer, NULL);
 
 	si_pm4_free_state(sctx, sctx->init_config, ~0);
 	si_pm4_delete_state(sctx, gs_rings, sctx->gs_rings);
+	si_pm4_delete_state(sctx, tf_ring, sctx->tf_state);
 	for (i = 0; i < Elements(sctx->vgt_shader_config); i++)
 		si_pm4_delete_state(sctx, vgt_shader_config, sctx->vgt_shader_config[i]);
 
diff --git a/src/gallium/drivers/radeonsi/si_pipe.h b/src/gallium/drivers/radeonsi/si_pipe.h
index ad64e91..b985d74 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.h
+++ b/src/gallium/drivers/radeonsi/si_pipe.h
@@ -203,6 +203,8 @@ struct si_context {
 	struct si_pm4_state	*gs_rings;
 	struct pipe_resource	*esgs_ring;
 	struct pipe_resource	*gsvs_ring;
+	struct si_pm4_state	*tf_state;
+	struct pipe_resource	*tf_ring;
 
 	LLVMTargetMachineRef		tm;
 
diff --git a/src/gallium/drivers/radeonsi/si_state.h b/src/gallium/drivers/radeonsi/si_state.h
index fe3ce39..f32b30b 100644
--- a/src/gallium/drivers/radeonsi/si_state.h
+++ b/src/gallium/drivers/radeonsi/si_state.h
@@ -107,6 +107,7 @@ union si_state {
 		struct si_pm4_state		*es;
 		struct si_pm4_state		*gs;
 		struct si_pm4_state		*gs_rings;
+		struct si_pm4_state		*tf_ring;
 		struct si_pm4_state		*vgt_shader_config;
 		struct si_pm4_state		*vs;
 		struct si_pm4_state		*ps;
diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index 6d40d72..16d8c03 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -1135,6 +1135,40 @@ static void si_update_spi_tmpring_size(struct si_context *sctx)
 				S_0286E8_WAVESIZE(scratch_bytes_per_wave >> 10);
 }
 
+static void si_init_tess_factor_ring(struct si_context *sctx)
+{
+	assert(!sctx->tf_state);
+	sctx->tf_state = CALLOC_STRUCT(si_pm4_state);
+
+	sctx->tf_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
+					   PIPE_USAGE_DEFAULT,
+					   32768 * sctx->screen->b.info.max_se);
+	sctx->b.clear_buffer(&sctx->b.b, sctx->tf_ring, 0,
+			     sctx->tf_ring->width0, fui(0), false);
+	assert(((sctx->tf_ring->width0 / 4) & C_030938_SIZE) == 0);
+
+	if (sctx->b.chip_class >= CIK) {
+		si_pm4_set_reg(sctx->tf_state, R_030938_VGT_TF_RING_SIZE,
+			       S_030938_SIZE(sctx->tf_ring->width0 / 4));
+		si_pm4_set_reg(sctx->tf_state, R_030940_VGT_TF_MEMORY_BASE,
+			       r600_resource(sctx->tf_ring)->gpu_address >> 8);
+	} else {
+		si_pm4_set_reg(sctx->tf_state, R_008988_VGT_TF_RING_SIZE,
+			       S_008988_SIZE(sctx->tf_ring->width0 / 4));
+		si_pm4_set_reg(sctx->tf_state, R_0089B8_VGT_TF_MEMORY_BASE,
+			       r600_resource(sctx->tf_ring)->gpu_address >> 8);
+	}
+	si_pm4_add_bo(sctx->tf_state, r600_resource(sctx->tf_ring),
+		      RADEON_USAGE_READWRITE, RADEON_PRIO_SHADER_RESOURCE_RW);
+	si_pm4_bind_state(sctx, tf_ring, sctx->tf_state);
+
+	si_set_ring_buffer(&sctx->b.b, PIPE_SHADER_TESS_CTRL,
+			   SI_RING_TESS_FACTOR, sctx->tf_ring, 0,
+			   sctx->tf_ring->width0, false, false, 0, 0);
+
+	sctx->b.flags |= SI_CONTEXT_VGT_FLUSH;
+}
+
 static void si_update_vgt_shader_config(struct si_context *sctx)
 {
 	/* Calculate the index of the config.
@@ -1177,6 +1211,9 @@ void si_update_shaders(struct si_context *sctx)
 
 	/* Update stages before GS. */
 	if (sctx->tes_shader) {
+		if (!sctx->tf_state)
+			si_init_tess_factor_ring(sctx);
+
 		/* VS as LS */
 		si_shader_select(ctx, sctx->vs_shader);
 		si_pm4_bind_state(sctx, ls, sctx->vs_shader->current->pm4);
-- 
2.1.0