add activate_tiamat_position_hack

docs/examples/activate_tiamat_position_hack.lua

@@ -0,0 +1,9 @@
+activate_tiamat_position_hack(true);
+
+set_post_entity_spawn(function(ent)
+
+	-- make them same as in the game, but relative to the tiamat entity
+	ent.attack_x = ent.x - 1
+	ent.attack_y = ent.y + 2
+
+end, SPAWN_TYPE.ANY, 0, ENT_TYPE.MONS_TIAMAT)

src/game_api/entities_monsters.hpp

@@ -796,6 +796,10 @@ class Tiamat : public Monster
     float tail_radian; // Counts from 0 to 2*pi, Used to calculate tail angle
     float tail_move_speed;
     float right_arm_angle;
+    /// This is cusome variable, you need [activate_tiamat_position_hack](#activate_tiamat_position_hack) to use it
+    float attack_x;
+    /// This is cusome variable, you need [activate_tiamat_position_hack](#activate_tiamat_position_hack) to use it
+    float attack_y;
 };
 
 class GiantFrog : public Monster

src/game_api/rpc.cpp

@@ -1891,3 +1891,16 @@ void set_tiamat_cutscene_enabled(bool enable)
 {
     set_skip_tiamat_cutscene(!enable);
 }
+
+void activate_tiamat_position_hack(bool activate)
+{
+    static const auto code_addr = get_address("tiamat_attack_position");
+
+    static const std::string_view code{"\xF3\x0F\x5C\xBE\x78\x01\x00\x00"sv   // subss  xmm7,DWORD PTR [rsi+0x178]
+                                       "\xF3\x0F\x5C\xB6\x7C\x01\x00\x00"sv}; // subss  xmm6,DWORD PTR [rsi+0x17C]
+
+    if (activate)
+        write_mem_recoverable("activate_tiamat_position_hack", code_addr, code, true);
+    else
+        recover_mem("activate_tiamat_position_hack");
+}

src/game_api/rpc.hpp

@@ -139,3 +139,4 @@ void set_level_string(std::u16string_view text);
 void set_ending_unlock(ENT_TYPE type);
 void set_olmec_cutscene_enabled(bool enable);
 void set_tiamat_cutscene_enabled(bool enable);
+void activate_tiamat_position_hack(bool activate);

src/game_api/script/lua_vm.cpp

@@ -2018,6 +2018,11 @@ end
 
     lua["set_tiamat_cutscene_enabled"] = set_tiamat_cutscene_enabled;
 
+    /// Activate custom variables for position used for detecting the player (normally hardcoded)
+    /// note: because those variables are custom and game does not initiate them, you need to do it yourself for each Tiamat entity, recommending `set_post_entity_spawn`
+    /// default game values are: attack_x = 17.5 attack_y = 62.5
+    lua["activate_tiamat_position_hack"] = activate_tiamat_position_hack;
+
     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/script/usertypes/entities_monsters_lua.cpp

@@ -947,6 +947,10 @@ void register_usertypes(sol::state& lua)
         &Tiamat::tail_move_speed,
         "right_arm_angle",
         &Tiamat::right_arm_angle,
+        "attack_x",
+        &Tiamat::attack_x,
+        "attack_y",
+        &Tiamat::attack_y,
         sol::base_classes,
         sol::bases<Entity, Movable, PowerupCapable, Monster>());
 

src/game_api/search.cpp

@@ -2002,6 +2002,16 @@ std::unordered_map<std::string_view, AddressRule> g_address_rules{
             .offset(0x6) // after the jump instruction
             .at_exe(),
     },
+    {
+        "tiamat_attack_position"sv,
+        // default 17.5, 62.5
+        PatternCommandBuffer{}
+            .get_virtual_function_address(VTABLE_OFFSET::MONS_TIAMAT, (VIRT_FUNC)78)
+            .find_after_inst("45 0F 57 C0"_gh)
+            .find_inst("\xF3"sv)
+            .offset(0xA)
+            .at_exe(),
+    },
 };
 std::unordered_map<std::string_view, size_t> g_cached_addresses;