mesa: better error message for invalid texture unit index

diff --git a/src/mesa/shader/arbprogparse.c b/src/mesa/shader/arbprogparse.c
index c7a031067efe905b25275f694558387b90d9c480..bb4c5b38d410dec11aa21ff9f44db828150c0498 100644 (file)
--- a/src/mesa/shader/arbprogparse.c
+++ b/src/mesa/shader/arbprogparse.c
@@ -1014,7 +1014,10 @@ parse_teximage_num (GLcontext * ctx, const GLubyte ** inst,
    GLint i = parse_integer (inst, Program);
 
    if ((i < 0) || (i >= (int)ctx->Const.MaxTextureImageUnits)) {
-      program_error(ctx, Program->Position, "Invalid texture image index");
+      char s[100];
+      _mesa_snprintf(s, sizeof(s), "Invalid texture image index %d (%u is max)",
+                     i, ctx->Const.MaxTextureImageUnits);
+      program_error(ctx, Program->Position, s);
       return 1;
    }