From 69dbc046eb5a82b38c6d5c3302e9b3b0b3c1bcf1 Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Mon, 21 Feb 2011 16:10:36 +0200
Subject: preliminary lua scripting framework for objects

---
 src/clientobject.cpp | 488 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 486 insertions(+), 2 deletions(-)

(limited to 'src/clientobject.cpp')

diff --git a/src/clientobject.cpp b/src/clientobject.cpp
index 46db389cd..e6646eff1 100644
--- a/src/clientobject.cpp
+++ b/src/clientobject.cpp
@@ -51,7 +51,7 @@ ClientActiveObject* ClientActiveObject::create(u8 type)
 	{
 		dstream<<"ClientActiveObject::create(): passed "
 				<<"ACTIVEOBJECT_TYPE_LUA"<<std::endl;
-		return NULL;
+		return new LuaCAO(0);
 	}
 	else
 	{
@@ -151,7 +151,7 @@ void TestCAO::step(float dtime)
 
 void TestCAO::processMessage(const std::string &data)
 {
-	//dstream<<"TestCAO: Got data: "<<data<<std::endl;
+	dstream<<"TestCAO: Got data: "<<data<<std::endl;
 	std::istringstream is(data, std::ios::binary);
 	u16 cmd;
 	is>>cmd;
@@ -166,4 +166,488 @@ void TestCAO::processMessage(const std::string &data)
 	}
 }
 
+/*
+	LuaCAO
+*/
+
+extern "C"{
+#include "lstring.h"
+}
+
+/*
+	object_set_position(self, x, y, z)
+*/
+static int lf_object_set_position(lua_State *L)
+{
+	// 4: z
+	lua_Number z = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 3: y
+	lua_Number y = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 2: x
+	lua_Number x = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 1: self
+	LuaCAO *self = (LuaCAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+	
+	self->setPosition(v3f(x*BS,y*BS,z*BS));
+	
+	return 0; // Number of return values
+}
+
+/*
+	object_set_rotation(self, x, y, z)
+*/
+static int lf_object_set_rotation(lua_State *L)
+{
+	// 4: z
+	lua_Number z = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 3: y
+	lua_Number y = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 2: x
+	lua_Number x = lua_tonumber(L, -1);
+	lua_pop(L, 1);
+	// 1: self
+	LuaCAO *self = (LuaCAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+	
+	self->setRotation(v3f(x,y,z));
+	
+	return 0; // Number of return values
+}
+
+/*
+	object_add_to_mesh(self, image, corners, backface_culling)
+	corners is an array like this:
+	{{x,y,z},{x,y,z},{x,y,z},{x,y,z}}
+*/
+static int lf_object_add_to_mesh(lua_State *L)
+{
+	// 4: backface_culling
+	bool backface_culling = lua_toboolean(L, -1);
+	lua_pop(L, 1);
+	// 3: corners
+	if(lua_istable(L, -1) == false)
+	{
+		dstream<<"ERROR: object_add_to_mesh(): parameter 3 not a table"
+				<<std::endl;
+		return 0;
+	}
+	v3f corners[4];
+	// Loop table
+	for(int i=0; i<4; i++)
+	{
+		// Get child table
+		lua_pushinteger(L, i+1);
+		lua_gettable(L, -2);
+		if(lua_istable(L, -1) == false)
+		{
+			dstream<<"ERROR: object_add_to_mesh(): parameter 3 not a"
+					" table of tables"<<std::endl;
+			return 0;
+		}
+
+		// Get x, y and z from the child table
+		
+		lua_pushinteger(L, 1);
+		lua_gettable(L, -2);
+		corners[i].X = lua_tonumber(L, -1) * BS;
+		lua_pop(L, 1);
+
+		lua_pushinteger(L, 2);
+		lua_gettable(L, -2);
+		corners[i].Y = lua_tonumber(L, -1) * BS;
+		lua_pop(L, 1);
+
+		lua_pushinteger(L, 3);
+		lua_gettable(L, -2);
+		corners[i].Z = lua_tonumber(L, -1) * BS;
+		lua_pop(L, 1);
+
+		// Pop child table
+		lua_pop(L, 1);
+	}
+	lua_pop(L, 1);
+	// 2: image
+	const char *image = lua_tostring(L, -1);
+	lua_pop(L, 1);
+	// 1: self
+	LuaCAO *self = (LuaCAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+
+	assert(self);
+	
+	self->addToMesh(image, corners, backface_culling);
+	
+	return 0; // Number of return values
+}
+
+/*
+	object_clear_mesh(self)
+*/
+static int lf_object_clear_mesh(lua_State *L)
+{
+	// 1: self
+	LuaCAO *self = (LuaCAO*)lua_touserdata(L, -1);
+	lua_pop(L, 1);
+	
+	assert(self);
+
+	self->clearMesh();
+
+	return 0;
+}
+
+LuaCAO::LuaCAO(u16 id):
+	ClientActiveObject(id),
+	L(NULL),
+	m_smgr(NULL),
+	m_node(NULL),
+	m_mesh(NULL),
+	m_position(v3f(0,10*BS,0))
+{
+	dstream<<"LuaCAO::LuaCAO(): id="<<id<<std::endl;
+	L = lua_open();
+	assert(L);
+	
+	// Load libraries
+	luaopen_base(L);
+	luaopen_table(L);
+	luaopen_string(L);
+	luaopen_math(L);
+
+	// Disable some stuff
+	const char *to_disable[] = {
+		"arg",
+		"debug",
+		"dofile",
+		"io",
+		"loadfile",
+		"os",
+		"package",
+		"require",
+		NULL
+	};
+	const char **td = to_disable;
+	do{
+		lua_pushnil(L);
+		lua_setglobal(L, *td);
+	}while(*(++td));
+	
+	// Add globals
+	//lua_pushlightuserdata(L, this);
+	//lua_setglobal(L, "self");
+	
+	// Register functions
+	lua_register(L, "object_set_position", lf_object_set_position);
+	lua_register(L, "object_set_rotation", lf_object_set_rotation);
+	lua_register(L, "object_add_to_mesh", lf_object_add_to_mesh);
+	lua_register(L, "object_clear_mesh", lf_object_clear_mesh);
+}
+
+LuaCAO::~LuaCAO()
+{
+	lua_close(L);
+}
+
+void LuaCAO::step(float dtime)
+{
+	/*
+		Call step(self, dtime) from lua
+	*/
+	
+	const char *funcname = "step";
+	lua_getglobal(L, funcname);
+	if(!lua_isfunction(L,-1))
+	{
+		lua_pop(L,1);
+		dstream<<"WARNING: LuaCAO: Function not found: "
+				<<funcname<<std::endl;
+		return;
+	}
+	
+	// Parameters:
+	// 1: self
+	lua_pushlightuserdata(L, this);
+	// 2: dtime
+	lua_pushnumber(L, dtime);
+	
+	// Call (2 parameters, 0 result)
+	if(lua_pcall(L, 2, 0, 0))
+	{
+		dstream<<"WARNING: LuaCAO: Error running function "
+				<<funcname<<": "
+				<<lua_tostring(L,-1)<<std::endl;
+		return;
+	}
+}
+
+void LuaCAO::processMessage(const std::string &data)
+{
+	/*
+		Call process_message(self, data) from lua
+	*/
+	
+	const char *funcname = "process_message";
+	lua_getglobal(L, funcname);
+	if(!lua_isfunction(L,-1))
+	{
+		lua_pop(L,1);
+		dstream<<"WARNING: LuaCAO: Function not found: "
+				<<funcname<<std::endl;
+		return;
+	}
+	
+	// Parameters:
+	// 1: self
+	lua_pushlightuserdata(L, this);
+	// 2: data
+	lua_pushlstring(L, data.c_str(), data.size());
+	
+	// Call (2 parameters, 0 results)
+	if(lua_pcall(L, 2, 1, 0))
+	{
+		dstream<<"WARNING: LuaCAO: Error running function "
+				<<funcname<<": "
+				<<lua_tostring(L,-1)<<std::endl;
+		return;
+	}
+}
+
+void LuaCAO::initialize(const std::string &data)
+{
+	dstream<<"LuaCAO::initialize(): id="<<getId()<<std::endl;
+
+	std::istringstream is(data, std::ios::binary);
+	std::string script = deSerializeLongString(is);
+	std::string other = deSerializeLongString(is);
+
+	/*dstream<<"=== script (size="<<script.size()<<")"<<std::endl
+			<<script<<std::endl
+			<<"==="<<std::endl;*/
+	dstream<<"LuaCAO::initialize(): script size="<<script.size()<<std::endl;
+	
+	/*dstream<<"other.size()="<<other.size()<<std::endl;
+	dstream<<"other=\""<<other<<"\""<<std::endl;*/
+	
+	// Load the script to lua
+	loadScript(script);
+
+	/*
+		Call initialize(self, data) in the script
+	*/
+	
+	const char *funcname = "initialize";
+	lua_getglobal(L, funcname);
+	if(!lua_isfunction(L,-1))
+	{
+		lua_pop(L,1);
+		dstream<<"WARNING: LuaCAO: Function not found: "
+				<<funcname<<std::endl;
+		return;
+	}
+	
+	// Parameters:
+	// 1: self
+	lua_pushlightuserdata(L, this);
+	// 2: data (other)
+	lua_pushlstring(L, other.c_str(), other.size());
+	
+	// Call (2 parameters, 0 result)
+	if(lua_pcall(L, 2, 0, 0))
+	{
+		dstream<<"WARNING: LuaCAO: Error running function "
+				<<funcname<<": "
+				<<lua_tostring(L,-1)<<std::endl;
+		return;
+	}
+
+}
+
+void LuaCAO::loadScript(const std::string script)
+{
+	int ret;
+	ret = luaL_loadstring(L, script.c_str());
+	if(ret)
+	{
+		const char *message = lua_tostring(L, -1);
+		lua_pop(L, 1);
+		dstream<<"LuaCAO::loadScript(): lua_loadstring failed: "
+				<<message<<std::endl;
+		assert(0);
+		return;
+	}
+	ret = lua_pcall(L, 0, 0, 0);
+	if(ret)
+	{
+		const char *message = lua_tostring(L, -1);
+		lua_pop(L, 1);
+		dstream<<"LuaCAO::loadScript(): lua_pcall failed: "
+				<<message<<std::endl;
+		assert(0);
+		return;
+	}
+}
+
+void LuaCAO::addToScene(scene::ISceneManager *smgr)
+{
+	if(m_smgr != NULL)
+	{
+		dstream<<"WARNING: LuaCAO::addToScene() called more than once"
+				<<std::endl;
+		return;
+	}
+
+	if(m_node != NULL)
+	{
+		dstream<<"WARNING: LuaCAO::addToScene(): m_node != NULL"
+				<<std::endl;
+		return;
+	}
+	
+	m_smgr = smgr;
+	
+	if(m_mesh == NULL)
+	{
+		m_mesh = new scene::SMesh();
+		m_node = smgr->addMeshSceneNode(m_mesh, NULL);
+		
+		/*v3f corners[4] = {
+			v3f(-BS/2,-BS/4,0),
+			v3f(BS/2,-BS/4,0),
+			v3f(BS/2,BS/4,0),
+			v3f(-BS/2,BS/4,0),
+		};
+		addToMesh("rat.png", corners, false);*/
+	}
+	else
+	{
+		dstream<<"WARNING: LuaCAO::addToScene(): m_mesh != NULL"
+				<<std::endl;
+		return;
+	}
+	
+	updateNodePos();
+}
+
+void LuaCAO::addToMesh(const char *image, v3f *corners, bool backface_culling)
+{
+	dstream<<"INFO: addToMesh called"<<std::endl;
+
+	video::IVideoDriver* driver = m_smgr->getVideoDriver();
+	
+	assert(m_mesh);
+		
+	scene::IMeshBuffer *buf = new scene::SMeshBuffer();
+	video::SColor c(255,255,255,255);
+	video::S3DVertex vertices[4] =
+	{
+		video::S3DVertex(corners[0], v3f(0,0,0), c, v2f(0,1)),
+		video::S3DVertex(corners[1], v3f(0,0,0), c, v2f(1,1)),
+		video::S3DVertex(corners[2], v3f(0,0,0), c, v2f(1,0)),
+		video::S3DVertex(corners[3], v3f(0,0,0), c, v2f(0,0)),
+		/*video::S3DVertex(-BS/2,-BS/4,0, 0,0,0, c, 0,1),
+		video::S3DVertex(BS/2,-BS/4,0, 0,0,0, c, 1,1),
+		video::S3DVertex(BS/2,BS/4,0, 0,0,0, c, 1,0),
+		video::S3DVertex(-BS/2,BS/4,0, 0,0,0, c, 0,0),*/
+	};
+	u16 indices[] = {0,1,2,2,3,0};
+	buf->append(vertices, 4, indices, 6);
+	// Set material
+	buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
+	buf->getMaterial().setFlag(video::EMF_BACK_FACE_CULLING, backface_culling);
+	buf->getMaterial().setTexture
+			(0, driver->getTexture(porting::getDataPath(image).c_str()));
+	buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
+	buf->getMaterial().setFlag(video::EMF_FOG_ENABLE, true);
+	buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+	// Add to mesh
+	m_mesh->addMeshBuffer(buf);
+	buf->drop();
+	// Reset mesh
+	if(m_node)
+		m_node->setMesh(m_mesh);
+}
+
+void LuaCAO::clearMesh()
+{
+	if(m_node)
+	{
+		m_node->setMesh(NULL);
+	}
+	
+	if(m_mesh)
+	{
+		m_mesh->drop();
+		m_mesh = NULL;
+	}
+}
+
+void LuaCAO::removeFromScene()
+{
+	if(m_node == NULL)
+		return;
+	
+	if(m_node)
+	{
+		m_node->remove();
+		m_node = NULL;
+	}
+	if(m_mesh)
+	{
+		m_mesh->drop();
+		m_mesh = NULL;
+	}
+
+	m_smgr = NULL;
+}
+
+void LuaCAO::updateLight(u8 light_at_pos)
+{
+}
+
+v3s16 LuaCAO::getLightPosition()
+{
+	return floatToInt(m_position, BS);
+}
+
+void LuaCAO::updateNodePos()
+{
+	if(m_node == NULL)
+		return;
+
+	m_node->setPosition(m_position);
+	m_node->setRotation(-m_rotation);
+}
+
+void LuaCAO::setPosition(v3f pos)
+{
+	m_position = pos;
+	updateNodePos();
+}
+
+v3f LuaCAO::getPosition()
+{
+	return m_position;
+}
+
+void LuaCAO::setRotation(v3f rot)
+{
+	m_rotation = rot;
+	updateNodePos();
+}
+
+v3f LuaCAO::getRotation()
+{
+	return m_rotation;
+}
+
 
-- 
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