[Mesa-dev] [PATCH] r600g: adjust QUANT_MODE for higher precision

[Vadim Girlin]

Use 1/256 for R6xx/7xx, 1/4096 for evergreen, instead of default 1/16.

Helps to pass some piglit tests (fbo, multisample).

Signed-off-by: Vadim Girlin <vadimgirlin at gmail.com>
---
 src/gallium/drivers/r600/evergreen_state.c |  3 ++-
 src/gallium/drivers/r600/evergreend.h      | 11 +++++++++++
 src/gallium/drivers/r600/r600_state.c      |  3 ++-
 src/gallium/drivers/r600/r600d.h           |  9 +++++++++
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/r600/evergreen_state.c b/src/gallium/drivers/r600/evergreen_state.c
index 28a83f2..bda8ed5 100644
--- a/src/gallium/drivers/r600/evergreen_state.c
+++ b/src/gallium/drivers/r600/evergreen_state.c
@@ -920,7 +920,8 @@ static void *evergreen_create_rs_state(struct pipe_context *ctx,
 					S_028C08_PIX_CENTER_HALF(state->gl_rasterization_rules));
 	} else {
 		r600_pipe_state_add_reg(rstate, R_028C08_PA_SU_VTX_CNTL,
-					S_028C08_PIX_CENTER_HALF(state->gl_rasterization_rules));
+					S_028C08_PIX_CENTER_HALF(state->gl_rasterization_rules) |
+					S_028C08_QUANT_MODE(V_028C08_X_1_4096TH));
 	}
 	r600_pipe_state_add_reg(rstate, R_028B7C_PA_SU_POLY_OFFSET_CLAMP, fui(state->offset_clamp));
 	r600_pipe_state_add_reg(rstate, R_028814_PA_SU_SC_MODE_CNTL,
diff --git a/src/gallium/drivers/r600/evergreend.h b/src/gallium/drivers/r600/evergreend.h
index 91d78f8..e4d72f5 100644
--- a/src/gallium/drivers/r600/evergreend.h
+++ b/src/gallium/drivers/r600/evergreend.h
@@ -1955,6 +1955,17 @@
 #define   S_028C08_PIX_CENTER_HALF(x)                  (((x) & 0x1) << 0)
 #define   G_028C08_PIX_CENTER_HALF(x)                  (((x) >> 0) & 0x1)
 #define   C_028C08_PIX_CENTER_HALF                     0xFFFFFFFE
+#define   S_028C08_QUANT_MODE(x)                       (((x) & 0x7) << 3)
+#define   G_028C08_QUANT_MODE(x)                       (((x) >> 3) & 0x7)
+#define   C_028C08_QUANT_MODE                          0xFFFFFFC7
+#define     V_028C08_X_1_16TH                          0x00
+#define     V_028C08_X_1_8TH                           0x01
+#define     V_028C08_X_1_4TH                           0x02
+#define     V_028C08_X_1_2                             0x03
+#define     V_028C08_X_1                               0x04
+#define     V_028C08_X_1_256TH                         0x05
+#define     V_028C08_X_1_1024TH                        0x06
+#define     V_028C08_X_1_4096TH                        0x07
 #define R_028C0C_PA_CL_GB_VERT_CLIP_ADJ              0x00028C0C
 #define R_028C10_PA_CL_GB_VERT_DISC_ADJ              0x00028C10
 #define R_028C14_PA_CL_GB_HORZ_CLIP_ADJ              0x00028C14
diff --git a/src/gallium/drivers/r600/r600_state.c b/src/gallium/drivers/r600/r600_state.c
index 26db24b..53bbdd9 100644
--- a/src/gallium/drivers/r600/r600_state.c
+++ b/src/gallium/drivers/r600/r600_state.c
@@ -948,7 +948,8 @@ static void *r600_create_rs_state(struct pipe_context *ctx,
 	r600_pipe_state_add_reg(rstate, R_028A4C_PA_SC_MODE_CNTL, sc_mode_cntl);
 
 	r600_pipe_state_add_reg(rstate, R_028C08_PA_SU_VTX_CNTL,
-				S_028C08_PIX_CENTER_HALF(state->gl_rasterization_rules));
+				S_028C08_PIX_CENTER_HALF(state->gl_rasterization_rules) |
+				S_028C08_QUANT_MODE(V_028C08_X_1_256TH));
 
 	r600_pipe_state_add_reg(rstate, R_028DFC_PA_SU_POLY_OFFSET_CLAMP, fui(state->offset_clamp));
 	r600_pipe_state_add_reg(rstate, R_028814_PA_SU_SC_MODE_CNTL,
diff --git a/src/gallium/drivers/r600/r600d.h b/src/gallium/drivers/r600/r600d.h
index a6da0a2..28423e1 100644
--- a/src/gallium/drivers/r600/r600d.h
+++ b/src/gallium/drivers/r600/r600d.h
@@ -2194,6 +2194,15 @@
 #define   S_028C08_PIX_CENTER_HALF(x)                  (((x) & 0x1) << 0)
 #define   G_028C08_PIX_CENTER_HALF(x)                  (((x) >> 0) & 0x1)
 #define   C_028C08_PIX_CENTER_HALF                     0xFFFFFFFE
+#define   S_028C08_QUANT_MODE(x)                       (((x) & 0x7) << 3)
+#define   G_028C08_QUANT_MODE(x)                       (((x) >> 3) & 0x7)
+#define   C_028C08_QUANT_MODE                          0xFFFFFFC7
+#define     V_028C08_X_1_16TH                          0x00
+#define     V_028C08_X_1_8TH                           0x01
+#define     V_028C08_X_1_4TH                           0x02
+#define     V_028C08_X_1_2                             0x03
+#define     V_028C08_X_1                               0x04
+#define     V_028C08_X_1_256TH                         0x05
 #define R_028C1C_PA_SC_AA_SAMPLE_LOCS_MCTX           0x028C1C
 #define R_028C48_PA_SC_AA_MASK                       0x028C48
 #define R_028810_PA_CL_CLIP_CNTL                     0x028810
-- 
1.7.11.4