Add _tnl_set_attr() to complement existing get_attr() call.

src/mesa/tnl/t_vertex.c

@@ -937,11 +937,31 @@ void _tnl_get_attr( GLcontext *ctx, const void *vin,
       }
    }
 
-   /* Else return the value from ctx->Current
+   /* Else return the value from ctx->Current -- dangerous???
     */
    _mesa_memcpy( dest, ctx->Current.Attrib[attr], 4*sizeof(GLfloat));
 }
 
+
+/* Complementary operation to the above.
+ */
+void _tnl_set_attr( GLcontext *ctx, void *vout,
+		    GLenum attr, const GLfloat *src )
+{
+   struct tnl_clipspace *vtx = GET_VERTEX_STATE(ctx);
+   const struct tnl_clipspace_attr *a = vtx->attr;
+   int attr_count = vtx->attr_count;
+   int j;
+
+   for (j = 0; j < attr_count; j++) {
+      if (a[j].attrib == (int)attr) {
+	 a[j].insert[4-1]( &a[j], (GLubyte *)vout + a[j].vertoffset, src );
+	 return;
+      }
+   }
+}
+
+
 void *_tnl_get_vertex( GLcontext *ctx, GLuint nr )
 {
    struct tnl_clipspace *vtx = GET_VERTEX_STATE(ctx);

src/mesa/tnl/t_vertex.h

@@ -82,6 +82,12 @@ extern void _tnl_copy_pv(  GLcontext *ctx, GLuint edst, GLuint esrc );
 extern void _tnl_get_attr( GLcontext *ctx, const void *vertex, GLenum attrib,
 			   GLfloat *dest );
 
+/* Complementary to the above.
+ */
+extern void _tnl_set_attr( GLcontext *ctx, void *vout, GLenum attrib, 
+			   const GLfloat *src );
+
+
 extern void *_tnl_get_vertex( GLcontext *ctx, GLuint nr );