compiler: add INTERP_MODE_COLOR for radeonsi

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6340>
diff --git a/src/compiler/glsl/ir_print_visitor.cpp b/src/compiler/glsl/ir_print_visitor.cpp
index 7e5e644..c228493 100644
--- a/src/compiler/glsl/ir_print_visitor.cpp
+++ b/src/compiler/glsl/ir_print_visitor.cpp
@@ -198,7 +198,7 @@
                                 "in ", "out ", "inout ",
 			        "const_in ", "sys ", "temporary " };
    STATIC_ASSERT(ARRAY_SIZE(mode) == ir_var_mode_count);
-   const char *const interp[] = { "", "smooth", "flat", "noperspective", "explicit" };
+   const char *const interp[] = { "", "smooth", "flat", "noperspective", "explicit", "color" };
    STATIC_ASSERT(ARRAY_SIZE(interp) == INTERP_MODE_COUNT);
    const char *const precision[] = { "", "highp ", "mediump ", "lowp "};
 
diff --git a/src/compiler/shader_enums.c b/src/compiler/shader_enums.c
index a91c443..0e28c55 100644
--- a/src/compiler/shader_enums.c
+++ b/src/compiler/shader_enums.c
@@ -281,6 +281,7 @@
       ENUM(INTERP_MODE_FLAT),
       ENUM(INTERP_MODE_NOPERSPECTIVE),
       ENUM(INTERP_MODE_EXPLICIT),
+      ENUM(INTERP_MODE_COLOR),
    };
    STATIC_ASSERT(ARRAY_SIZE(names) == INTERP_MODE_COUNT);
    return NAME(qual);
diff --git a/src/compiler/shader_enums.h b/src/compiler/shader_enums.h
index 69240b4..9a04487 100644
--- a/src/compiler/shader_enums.h
+++ b/src/compiler/shader_enums.h
@@ -680,6 +680,7 @@
    INTERP_MODE_FLAT,
    INTERP_MODE_NOPERSPECTIVE,
    INTERP_MODE_EXPLICIT,
+   INTERP_MODE_COLOR, /**< glShadeModel determines the interp mode */
    INTERP_MODE_COUNT /**< Number of interpolation qualifiers */
 };