feat(lua): Expose Script Patches & Functions (#3393)

docs/lua/tables/script.md

@@ -2,11 +2,16 @@
 
 Table containing helper functions related to gta scripts.
 
-## Functions (3)
+## Functions (5)
 
 ### `register_looped(name, func)`
 
 Registers a function that will be looped as a gta script.
+
+- **Parameters:**
+  - `name` (string): name of your new looped script
+  - `func` (function): function that will be executed in a forever loop.
+
 **Example Usage:**
 ```lua
 script.register_looped("nameOfMyLoopedScript", function (script)
@@ -31,18 +36,13 @@ script.register_looped("nameOfMyLoopedScript", function (script)
 end)
 ```
 
-- **Parameters:**
-  - `name` (string): name of your new looped script
-  - `func` (function): function that will be executed in a forever loop.
-
-**Example Usage:**
-```lua
-script.register_looped(name, func)
-```
-
 ### `run_in_fiber(func)`
 
 Executes a function once inside the fiber pool, you can call natives inside it and yield or sleep.
+
+- **Parameters:**
+  - `func` (function): function that will be executed once in the fiber pool.
+
 **Example Usage:**
 ```lua
 script.run_in_fiber(function (script)
@@ -67,23 +67,45 @@ script.run_in_fiber(function (script)
 end)
 ```
 
-- **Parameters:**
-  - `func` (function): function that will be executed once in the fiber pool.
-
-**Example Usage:**
-```lua
-script.run_in_fiber(func)
-```
-
 ### `execute_as_script(script_name, func)`
 
 - **Parameters:**
-  - `script_name` (string): target script thread.
-  - `func` (function): function that will be executed once in the script thread.
+  - `script_name` (string): Target script thread.
+  - `func` (function): Function that will be executed once in the script thread.
 
 **Example Usage:**
 ```lua
 script.execute_as_script(script_name, func)
 ```
 
+### `add_patch(script_name, name, pattern, offset, _patch)`
 
+Adds a patch for the specified script.
+
+- **Parameters:**
+  - `script_name` (string): The name of the script.
+  - `name` (string): The name of the patch.
+  - `pattern` (string): Pattern to scan for within the script.
+  - `offset` (integer): The position within the pattern.
+  - `_patch` (table): The bytes to be written into the script's bytecode.
+
+**Example Usage:**
+```lua
+script.add_patch("fm_content_xmas_truck", "Flickering Fix", "56 ? ? 4F ? ? 40 ? 5D ? ? ? 74", 0, {0x2B, 0x00, 0x00})
+```
+
+### `call_function(name, script_name, pattern, offset, _args)`
+
+Calls a function from the specified script.
+
+- **Parameters:**
+  - `name` (string): The name of the script function.
+  - `script_name` (string): The name of the script.
+  - `pattern` (string): The pattern to scan for within the script.
+  - `offset` (integer): The position within the pattern.
+  - `_args` (table): The arguments to pass to the script function.
+
+**Example Usage:**
+```lua
+script.call_function("Collect Collectible", "freemode", "2D 05 33 00 00", 0, {17, 0, 1, 1, 0})
+```

src/lua/bindings/script.cpp

@@ -4,6 +4,10 @@
 #include "lua/lua_manager.hpp"
 #include "script_mgr.hpp"
 #include "gta_util.hpp"
+#include "script_function.hpp"
+#include "lua/bindings/network.hpp"
+#include "memory/pattern.hpp"
+#include "services/script_patcher/script_patcher_service.hpp"
 
 namespace lua::script
 {
@@ -155,19 +159,64 @@ namespace lua::script
 	// Lua API: function
 	// Table: script
 	// Name: execute_as_script
-	// Param: script_name: string: target script thread.
-	// Param: func: function: function that will be executed once in the script thread.
+	// Param: script_name: string: Target script thread.
+	// Param: func: function: Function that will be executed once in the script thread.
 	static void execute_as_script(const std::string& script_name, sol::protected_function func)
 	{
 		big::gta_util::execute_as_script(rage::joaat(script_name), func);
 	}
 
+	// Lua API: function
+	// Table: script
+	// Name: add_patch
+	// Param: script_name: string: The name of the script.
+	// Param: name: string: The name of the patch.
+	// Param: pattern: string: The pattern to scan for within the script.
+	// Param offset: integer: The position within the pattern.
+	// Param _patch: table: The bytes to be written into the script's bytecode.
+	// Adds a patch for the specified script.
+	// **Example Usage:**
+	//```lua
+	//script.add_patch("fm_content_xmas_truck", "Flickering Fix", "56 ? ? 4F ? ? 40 ? 5D ? ? ? 74", 0, {0x2B, 0x00, 0x00})
+	//```
+	static void add_patch(const std::string& script_name, const std::string& name, const std::string& pattern, int offset, sol::table _patch)
+	{
+		auto patch = convert_sequence<uint8_t>(_patch);
+
+		big::g_script_patcher_service->add_patch({rage::joaat(script_name), name, ::memory::pattern(pattern), offset, patch, nullptr}); // TO-DO: Add toggle feature?
+		if (auto program = big::gta_util::find_script_program(rage::joaat(script_name)))
+			big::g_script_patcher_service->on_script_load(program);
+	}
+	
+	// Lua API: function
+	// Table: script
+	// Name: call_function
+	// Param: name: string: The name of the script function.
+	// Param: script_name: string: The name of the script.
+	// Param: pattern: string: The pattern to scan for within the script.
+	// Param offset: integer: The position within the pattern.
+	// Param _args: table: The arguments to pass to the script function.
+	// Calls a function from the specified script.
+	// **Example Usage:**
+	//```lua
+	//script.call_function("Collect Collectible", "freemode", "2D 05 33 00 00", 0, {17, 0, 1, 1, 0})
+	//```
+	static void call_function(const std::string& name, const std::string& script_name, const std::string& pattern, int offset, sol::table _args)
+	{
+		auto args = convert_sequence<uint64_t>(_args);
+
+		big::script_function script_function(name, rage::joaat(script_name), pattern, offset);
+		script_function(args);
+	}
+
 	void bind(sol::state& state)
 	{
 		auto ns                 = state["script"].get_or_create<sol::table>();
 		ns["register_looped"]   = register_looped;
 		ns["run_in_fiber"]      = run_in_fiber;
 		ns["execute_as_script"] = execute_as_script;
+		ns["add_patch"]         = add_patch;
+		ns["call_function"]     = call_function;
 
 		auto usertype = state.new_usertype<script_util>("script_util");
 

src/script_function.cpp

@@ -38,7 +38,7 @@ namespace big
 		}
 	}
 
-	void script_function::call(rage::scrThread* thread, rage::scrProgram* program, std::initializer_list<uint64_t> args)
+	void script_function::call(rage::scrThread* thread, rage::scrProgram* program, const std::vector<uint64_t>& args)
 	{
 		auto tls_ctx   = rage::tlsContext::get();
 		auto stack     = (uint64_t*)thread->m_stack;
@@ -49,7 +49,7 @@ namespace big
 
 		rage::scrThreadContext ctx = thread->m_context;
 
-		for (auto& arg : args)
+		for (const auto& arg : args)
 			stack[ctx.m_stack_pointer++] = arg;
 
 		stack[ctx.m_stack_pointer++] = 0;
@@ -62,7 +62,7 @@ namespace big
 		tls_ctx->m_is_script_thread_active = og_thread != nullptr;
 	}
 
-	void script_function::call_latent(rage::scrThread* thread, rage::scrProgram* program, std::initializer_list<uint64_t> args, bool& done)
+	void script_function::call_latent(rage::scrThread* thread, rage::scrProgram* program, const std::vector<uint64_t>& args, bool& done)
 	{
 		g_fiber_pool->queue_job([this, thread, program, args, &done] {
 			auto stack = (uint64_t*)thread->m_stack;
@@ -71,7 +71,7 @@ namespace big
 
 			rage::scrThreadContext ctx = thread->m_context;
 
-			for (auto& arg : args)
+			for (const auto& arg : args)
 				stack[ctx.m_stack_pointer++] = arg;
 
 			stack[ctx.m_stack_pointer++] = 0;
@@ -101,7 +101,7 @@ namespace big
 		});
 	}
 
-	void script_function::static_call(std::initializer_list<uint64_t> args)
+	void script_function::static_call(const std::vector<uint64_t>& args)
 	{
 		populate_ip();
 
@@ -119,7 +119,7 @@ namespace big
 		delete[] (uint8_t*)thread; // without the cast it ends up calling the destructor which leads to some pretty funny crashes
 	}
 
-	void script_function::operator()(std::initializer_list<uint64_t> args)
+	void script_function::operator()(const std::vector<uint64_t>& args)
 	{
 		populate_ip();
 

src/script_function.hpp

@@ -16,13 +16,13 @@ namespace big
 	public:
 		script_function(const std::string& name, const rage::joaat_t script, const std::string& pattern, int32_t offset);
 		void populate_ip();
-		void call(rage::scrThread* thread, rage::scrProgram* program, std::initializer_list<uint64_t> args);
-		void call_latent(rage::scrThread* thread, rage::scrProgram* program, std::initializer_list<uint64_t> args, bool& done);
+		void call(rage::scrThread* thread, rage::scrProgram* program, const std::vector<uint64_t>& args);
+		void call_latent(rage::scrThread* thread, rage::scrProgram* program, const std::vector<uint64_t>& args, bool& done);
 
 		// for pure functions that do not need access to thread stack
-		void static_call(std::initializer_list<uint64_t> args);
+		void static_call(const std::vector<uint64_t>& args);
 
-		void operator()(std::initializer_list<uint64_t> args);
+		void operator()(const std::vector<uint64_t>& args);
 	};
 
 	namespace scr_functions