1 files changed, 6 insertions, 0 deletions
diff --git a/src/gallium/drivers/llvmpipe/lp_setup_line.c b/src/gallium/drivers/llvmpipe/lp_setup_line.c
index 829eb8a5a0..156bd63375 100644
--- a/src/gallium/drivers/llvmpipe/lp_setup_line.c
+++ b/src/gallium/drivers/llvmpipe/lp_setup_line.c
@@ -208,6 +208,12 @@ static void setup_line_coefficients( struct lp_setup_context *setup,
          fragcoord_usage_mask |= usage_mask;
          break;
 
+      case LP_INTERP_FACING:
+         for (i = 0; i < NUM_CHANNELS; i++)
+            if (usage_mask & (1 << i))
+               constant_coef(setup, tri, slot+1, 1.0, i);
+         break;
+
       default:
          assert(0);
       }