mesa: initial support for ARB_geometry_shader4

laying down the foundation for everything and implementing most of the
stuff.
linking, gl_VerticesIn and multidimensional inputs are left.

src/mesa/state_tracker/st_atom_shader.c

@@ -66,7 +66,19 @@ translate_fp(struct st_context *st,
    }
 }
 
+/*
+ * Translate geometry program if needed.
+ */
+static void
+translate_gp(struct st_context *st,
+             struct st_geometry_program *stgp)
+{
+   if (!stgp->tgsi.tokens) {
+      assert(stgp->Base.Base.NumInstructions > 1);
 
+      st_translate_geometry_program(st, stgp);
+   }
+}
 
 /**
  * Find a translated vertex program that corresponds to stvp and
@@ -222,3 +234,33 @@ const struct st_tracked_state st_update_vp = {
    },
    update_vp					/* update */
 };
+
+static void
+update_gp( struct st_context *st )
+{
+
+   struct st_geometry_program *stgp;
+
+   if (!st->ctx->GeometryProgram._Current) {
+      cso_set_geometry_shader_handle(st->cso_context, NULL);
+      return;
+   }
+
+   stgp = st_geometry_program(st->ctx->GeometryProgram._Current);
+   assert(stgp->Base.Base.Target == MESA_GEOMETRY_PROGRAM);
+
+   translate_gp(st, stgp);
+
+   st_reference_geomprog(st, &st->gp, stgp);
+
+   cso_set_geometry_shader_handle(st->cso_context, stgp->driver_shader);
+}
+
+const struct st_tracked_state st_update_gp = {
+   "st_update_gp",					/* name */
+   {							/* dirty */
+      0,						/* mesa */
+      ST_NEW_GEOMETRY_PROGRAM                           /* st */
+   },
+   update_gp  					/* update */
+};