r600g: Pass conservative depth parameters to hw

Supported on R700 and up.

Signed-off-by: Glenn Kennard <glenn.kennard@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

7 files changed, 53 insertions, 1 deletions

diff --git a/src/gallium/drivers/r600/evergreen_state.c b/src/gallium/drivers/r600/evergreen_state.c
index 60747d1..30e9026 100644
--- a/src/gallium/drivers/r600/evergreen_state.c
+++ b/src/gallium/drivers/r600/evergreen_state.c
@@ -2951,6 +2951,19 @@ void evergreen_update_ps_state(struct pipe_context *ctx, struct r600_pipe_shader
 	db_shader_control |= S_02880C_STENCIL_EXPORT_ENABLE(stencil_export);
 	db_shader_control |= S_02880C_MASK_EXPORT_ENABLE(mask_export);
 
+	switch (rshader->ps_conservative_z) {
+	default: /* fall through */
+	case TGSI_FS_DEPTH_LAYOUT_ANY:
+		db_shader_control |= S_02880C_CONSERVATIVE_Z_EXPORT(V_02880C_EXPORT_ANY_Z);
+		break;
+	case TGSI_FS_DEPTH_LAYOUT_GREATER:
+		db_shader_control |= S_02880C_CONSERVATIVE_Z_EXPORT(V_02880C_EXPORT_GREATER_THAN_Z);
+		break;
+	case TGSI_FS_DEPTH_LAYOUT_LESS:
+		db_shader_control |= S_02880C_CONSERVATIVE_Z_EXPORT(V_02880C_EXPORT_LESS_THAN_Z);
+		break;
+	}
+
 	exports_ps = 0;
 	for (i = 0; i < rshader->noutput; i++) {
 		if (rshader->output[i].name == TGSI_SEMANTIC_POSITION ||
diff --git a/src/gallium/drivers/r600/evergreend.h b/src/gallium/drivers/r600/evergreend.h
index 937ffcb..a9a65f7 100644
--- a/src/gallium/drivers/r600/evergreend.h
+++ b/src/gallium/drivers/r600/evergreend.h
@@ -815,6 +815,13 @@
 #define     V_02880C_EXPORT_DB_FOUR16                  0x01
 #define     V_02880C_EXPORT_DB_TWO                     0x02
 #define   S_02880C_ALPHA_TO_MASK_DISABLE(x)            (((x) & 0x1) << 12)
+#define   S_02880C_CONSERVATIVE_Z_EXPORT(x)            (((x) & 0x03) << 16)
+#define   G_02880C_CONSERVATIVE_Z_EXPORT(x)            (((x) >> 16) & 0x03)
+#define   C_02880C_CONSERVATIVE_Z_EXPORT               0xFFFCFFFF
+#define     V_02880C_EXPORT_ANY_Z                      0
+#define     V_02880C_EXPORT_LESS_THAN_Z                1
+#define     V_02880C_EXPORT_GREATER_THAN_Z             2
+#define     V_02880C_EXPORT_RESERVED                   3
 
 #define R_028A00_PA_SU_POINT_SIZE                    0x028A00
 #define   S_028A00_HEIGHT(x)                           (((x) & 0xFFFF) << 0)
diff --git a/src/gallium/drivers/r600/r600_pipe.h b/src/gallium/drivers/r600/r600_pipe.h
index 520b03f..950bb6b 100644
--- a/src/gallium/drivers/r600/r600_pipe.h
+++ b/src/gallium/drivers/r600/r600_pipe.h
@@ -116,6 +116,7 @@ struct r600_db_misc_state {
 	unsigned			log_samples;
 	unsigned			db_shader_control;
 	bool				htile_clear;
+	uint8_t				ps_conservative_z;
 };
 
 struct r600_cb_misc_state {
diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index fc6335a..560197c 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -2044,6 +2044,7 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
 
 	shader->fs_write_all = ctx.info.properties[TGSI_PROPERTY_FS_COLOR0_WRITES_ALL_CBUFS];
 	shader->vs_position_window_space = ctx.info.properties[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION];
+	shader->ps_conservative_z = (uint8_t)ctx.info.properties[TGSI_PROPERTY_FS_DEPTH_LAYOUT];
 
 	if (shader->vs_as_gs_a)
 		vs_add_primid_output(&ctx, key.vs.prim_id_out);
diff --git a/src/gallium/drivers/r600/r600_shader.h b/src/gallium/drivers/r600/r600_shader.h
index c240e71..2040f73 100644
--- a/src/gallium/drivers/r600/r600_shader.h
+++ b/src/gallium/drivers/r600/r600_shader.h
@@ -76,6 +76,8 @@ struct r600_shader {
 	boolean			uses_tex_buffers;
 	boolean                 gs_prim_id_input;
 
+	uint8_t			ps_conservative_z;
+
 	/* Size in bytes of a data item in the ring(s) (single vertex data).
 	   Stages with only one ring items 123 will be set to 0. */
 	unsigned		ring_item_sizes[4];
diff --git a/src/gallium/drivers/r600/r600_state.c b/src/gallium/drivers/r600/r600_state.c
index 1be3e1b..1305efa 100644
--- a/src/gallium/drivers/r600/r600_state.c
+++ b/src/gallium/drivers/r600/r600_state.c
@@ -1628,6 +1628,21 @@ static void r600_emit_db_misc_state(struct r600_context *rctx, struct r600_atom
 		S_028D10_FORCE_HIS_ENABLE0(V_028D10_FORCE_DISABLE) |
 		S_028D10_FORCE_HIS_ENABLE1(V_028D10_FORCE_DISABLE);
 
+	if (rctx->b.chip_class >= R700) {
+		switch (a->ps_conservative_z) {
+		default: /* fall through */
+		case TGSI_FS_DEPTH_LAYOUT_ANY:
+			db_render_control |= S_028D0C_CONSERVATIVE_Z_EXPORT(V_028D0C_EXPORT_ANY_Z);
+			break;
+		case TGSI_FS_DEPTH_LAYOUT_GREATER:
+			db_render_control |= S_028D0C_CONSERVATIVE_Z_EXPORT(V_028D0C_EXPORT_GREATER_THAN_Z);
+			break;
+		case TGSI_FS_DEPTH_LAYOUT_LESS:
+			db_render_control |= S_028D0C_CONSERVATIVE_Z_EXPORT(V_028D0C_EXPORT_LESS_THAN_Z);
+			break;
+		}
+	}
+
 	if (a->occlusion_query_enabled) {
 		if (rctx->b.chip_class >= R700) {
 			db_render_control |= S_028D0C_R700_PERFECT_ZPASS_COUNTS(1);
@@ -2787,6 +2802,7 @@ void r600_update_db_shader_control(struct r600_context * rctx)
 {
 	bool dual_export;
 	unsigned db_shader_control;
+	uint8_t ps_conservative_z;
 
 	if (!rctx->ps_shader) {
 		return;
@@ -2798,6 +2814,8 @@ void r600_update_db_shader_control(struct r600_context * rctx)
 	db_shader_control = rctx->ps_shader->current->db_shader_control |
 			    S_02880C_DUAL_EXPORT_ENABLE(dual_export);
 
+	ps_conservative_z = rctx->ps_shader->current->shader.ps_conservative_z;
+
 	/* When alpha test is enabled we can't trust the hw to make the proper
 	 * decision on the order in which ztest should be run related to fragment
 	 * shader execution.
@@ -2811,8 +2829,10 @@ void r600_update_db_shader_control(struct r600_context * rctx)
 		db_shader_control |= S_02880C_Z_ORDER(V_02880C_EARLY_Z_THEN_LATE_Z);
 	}
 
-	if (db_shader_control != rctx->db_misc_state.db_shader_control) {
+	if (db_shader_control != rctx->db_misc_state.db_shader_control ||
+		ps_conservative_z != rctx->db_misc_state.ps_conservative_z) {
 		rctx->db_misc_state.db_shader_control = db_shader_control;
+		rctx->db_misc_state.ps_conservative_z = ps_conservative_z;
 		r600_mark_atom_dirty(rctx, &rctx->db_misc_state.atom);
 	}
 }
diff --git a/src/gallium/drivers/r600/r600d.h b/src/gallium/drivers/r600/r600d.h
index 6bba88c..53f5ad6 100644
--- a/src/gallium/drivers/r600/r600d.h
+++ b/src/gallium/drivers/r600/r600d.h
@@ -781,6 +781,14 @@
 #define   S_028D0C_COPY_CENTROID(x)                    (((x) & 0x1) << 7)
 #define   S_028D0C_COPY_SAMPLE(x)                      (((x) & 0x1) << 8)
 #define   S_028D0C_R700_PERFECT_ZPASS_COUNTS(x)        (((x) & 0x1) << 15)
+#define   S_028D0C_CONSERVATIVE_Z_EXPORT(x)            (((x) & 0x03) << 13)
+#define   G_028D0C_CONSERVATIVE_Z_EXPORT(x)            (((x) >> 13) & 0x03)
+#define   C_028D0C_CONSERVATIVE_Z_EXPORT               0xFFFF9FFF
+#define     V_028D0C_EXPORT_ANY_Z                      0
+#define     V_028D0C_EXPORT_LESS_THAN_Z                1
+#define     V_028D0C_EXPORT_GREATER_THAN_Z             2
+#define     V_028D0C_EXPORT_RESERVED                   3
+
 #define R_028D10_DB_RENDER_OVERRIDE                  0x028D10
 #define   V_028D10_FORCE_OFF                         0
 #define   V_028D10_FORCE_ENABLE                      1