pattern and functions to change target framerate

src/game_api/rpc.cpp

@@ -2074,3 +2074,51 @@ void update_state()
         rf(state);
     }
 }
+
+void set_frametime(std::optional<double> frametime)
+{
+    static size_t offset = 0;
+    if (offset == 0)
+        offset = get_address("engine_frametime");
+    if (offset != 0)
+    {
+        if (frametime.has_value())
+            write_mem_recoverable("engine_frametime", offset, frametime.value(), true);
+        else
+            recover_mem("engine_frametime");
+    }
+}
+
+std::optional<double> get_frametime()
+{
+    static size_t offset = 0;
+    if (offset == 0)
+        offset = get_address("engine_frametime");
+    if (offset != 0)
+        return memory_read<double>(offset);
+    return std::nullopt;
+}
+
+void set_frametime_inactive(std::optional<double> frametime)
+{
+    static size_t offset = 0;
+    if (offset == 0)
+        offset = get_address("engine_frametime") + 0x10;
+    if (offset != 0)
+    {
+        if (frametime.has_value())
+            write_mem_recoverable("engine_frametime_inactive", offset, frametime.value(), true);
+        else
+            recover_mem("engine_frametime_inactive");
+    }
+}
+
+std::optional<double> get_frametime_inactive()
+{
+    static size_t offset = 0;
+    if (offset == 0)
+        offset = get_address("engine_frametime") + 0x10;
+    if (offset != 0)
+        return memory_read<double>(offset);
+    return std::nullopt;
+}

src/game_api/rpc.hpp

@@ -144,3 +144,7 @@ void activate_crush_elevator_hack(bool activate);
 void activate_hundun_hack(bool activate);
 void set_boss_door_control_enabled(bool enable);
 void update_state();
+void set_frametime(std::optional<double> frametime);
+std::optional<double> get_frametime();
+void set_frametime_inactive(std::optional<double> frametime);
+std::optional<double> get_frametime_inactive();

src/game_api/script/lua_vm.cpp

@@ -2042,6 +2042,18 @@ end
     /// Run state update manually, i.e. simulate one logic frame. Use in e.g. POST_UPDATE, but be mindful of infinite loops, this will cause another POST_UPDATE. Can even be called thousands of times to simulate minutes of gameplay in a few seconds.
     lua["update_state"] = update_state;
 
+    /// Set engine target frametime (1/framerate, default 1/60). Set to 0 to go as fast as possible. Call without arguments to reset.
+    lua["set_frametime"] = set_frametime;
+
+    /// Get engine target frametime (1/framerate, default 1/60).
+    lua["get_frametime"] = get_frametime;
+
+    /// Set engine target frametime when game is unfocused (1/framerate, default 1/33). Set to 0 to go as fast as possible. Call without arguments to reset.
+    lua["set_frametime_unfocused"] = set_frametime_inactive;
+
+    /// Get engine target frametime when game is unfocused (1/framerate, default 1/33).
+    lua["get_frametime_unfocused"] = get_frametime_inactive;
+
     lua.create_named_table("INPUTS", "NONE", 0, "JUMP", 1, "WHIP", 2, "BOMB", 4, "ROPE", 8, "RUN", 16, "DOOR", 32, "MENU", 64, "JOURNAL", 128, "LEFT", 256, "RIGHT", 512, "UP", 1024, "DOWN", 2048);
 
     lua.create_named_table(

src/game_api/search.cpp

@@ -1840,6 +1840,19 @@ std::unordered_map<std::string_view, AddressRule> g_address_rules{
             .at_exe()
             .function_start(),
     },
+    {
+        /* it's a static double, just find something that reads it
+           this+0x08 is clearly some kind of framerate related double, cause it's 60, but don't know what it does
+           this+0x10 is hopefully unfocused frametime for the other function, but maybe it needs own pattern
+        22d12248 00 00 00        double     0.01666666753590107
+                 20 11 11
+                 91 3f */
+        "engine_frametime"sv,
+        PatternCommandBuffer{}
+            .find_after_inst("48 8d 04 0a 48 85 d2 48 0f 44 c2 48 85 c9 48 0f 44 c1 66 0f 28 c8"_gh)
+            .decode_pc(4)
+            .at_exe(),
+    },
     {
         // Borrowed from Playlunky logger.cpp
         "game_log_function"sv,