fixed segfault (NULL _ShineTable[0]) in shade_rastpos()

src/mesa/main/rastpos.c

@@ -1,4 +1,4 @@
-/* $Id: rastpos.c,v 1.28 2001/06/26 21:15:36 brianp Exp $ */
+/* $Id: rastpos.c,v 1.29 2001/07/05 15:31:21 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -131,6 +131,9 @@ shade_rastpos(GLcontext *ctx,
    GLfloat diffuseColor[4], specularColor[4];
    GLfloat diffuse = 0, specular = 0;
 
+   if (!ctx->_ShineTable[0] || !ctx->_ShineTable[1])
+      _mesa_validate_all_lighting_tables( ctx );
+
    COPY_3V(diffuseColor, base[0]);
    diffuseColor[3] = sumA[0];
    ASSIGN_4V(specularColor, 0.0, 0.0, 0.0, 0.0);