3 files changed, 7 insertions, 2 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index 3e2b899d40e..52d4ff4e80b 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -2371,6 +2371,10 @@ exec_declaration(struct tgsi_exec_machine *mach,
                eval = eval_perspective_coef;
                break;
 
+            case TGSI_INTERPOLATE_COLOR:
+               eval = mach->flatshade_color ? eval_constant_coef : eval_perspective_coef;
+               break;
+
             default:
                assert(0);
                return;
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.h b/src/gallium/auxiliary/tgsi/tgsi_exec.h
index 223da2cb1c6..0817e14101b 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.h
@@ -263,7 +263,7 @@ struct tgsi_exec_machine
    const struct tgsi_interp_coef *InterpCoefs;
    struct tgsi_exec_vector       QuadPos;
    float                         Face;    /**< +1 if front facing, -1 if back facing */
-
+   bool                          flatshade_color;
    /* Conditional execution masks */
    uint CondMask;  /**< For IF/ELSE/ENDIF */
    uint LoopMask;  /**< For BGNLOOP/ENDLOOP */
diff --git a/src/gallium/auxiliary/tgsi/tgsi_strings.c b/src/gallium/auxiliary/tgsi/tgsi_strings.c
index aa12493d9b0..de9152dae21 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_strings.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_strings.c
@@ -117,7 +117,8 @@ const char *tgsi_interpolate_names[TGSI_INTERPOLATE_COUNT] =
 {
    "CONSTANT",
    "LINEAR",
-   "PERSPECTIVE"
+   "PERSPECTIVE",
+   "COLOR"
 };
 
 const char *tgsi_primitive_names[PIPE_PRIM_MAX] =