rsx: Cache draw subranges storage

Author: kd-11

rpcs3/Emu/RSX/NV47/FW/draw_call.cpp

@@ -138,15 +138,16 @@ namespace rsx
 		is_disjoint_primitive = is_primitive_disjointed(primitive);
 	}
 
-	simple_array<draw_range_t> draw_clause::get_subranges() const
+	const simple_array<draw_range_t>& draw_clause::get_subranges() const
 	{
 		ensure(!is_single_draw());
 
 		const auto range = get_range();
 		const auto limit = range.first + range.count;
 		const auto _pass_count = pass_count();
 
-		simple_array<draw_range_t> ret;
+		auto &ret = subranges_store;
+		ret.clear();
 		ret.reserve(_pass_count);
 
 		u32 previous_barrier = range.first;

rpcs3/Emu/RSX/NV47/FW/draw_call.hpp

@@ -35,6 +35,9 @@ namespace rsx
 		// Draw-time iterator to the draw_command_barriers struct
 		mutable simple_array<barrier_t>::iterator current_barrier_it;
 
+		// Subranges memory cache
+		mutable rsx::simple_array<draw_range_t> subranges_store;
+
 		// Helper functions
 		// Add a new draw command
 		void append_draw_command(const draw_range_t& range)
@@ -298,6 +301,6 @@ namespace rsx
 		 * Returns a compiled list of all subdraws.
 		 * NOTE: This is a non-trivial operation as it takes disjoint primitive boundaries into account.
 		 */
-		simple_array<draw_range_t> get_subranges() const;
+		const simple_array<draw_range_t>& get_subranges() const;
 	};
 }