radeonsi: fix polygon offset scale

The value was copied from r300g, which uses 1/12 subpixels, but this hw
uses 1/16 subpixels.

Fixes piglit: gl-1.4-polygon-offset (formerly a glean test)

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Cc: mesa-stable@lists.freedesktop.org

diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index 7b45273..3260943 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -666,7 +666,7 @@ static void *si_create_rs_state(struct pipe_context *ctx,
 
        /* offset */
        rs->offset_units = state->offset_units;
-       rs->offset_scale = state->offset_scale * 12.0f;
+       rs->offset_scale = state->offset_scale * 16.0f;
 
        si_pm4_set_reg(pm4, R_0286D4_SPI_INTERP_CONTROL_0,
                S_0286D4_FLAT_SHADE_ENA(1) |