From 112517494847f0c86f58544cbf4c35c9b7712ab1 Mon Sep 17 00:00:00 2001
From: Alexander Pickering <alex@cogarr.net>
Date: Thu, 1 Nov 2018 13:53:16 -0400
Subject: Refactored code and added library

Physics code for models now lives in the shared directory.
To get file loading without irrlicht, a single-file header library
(lib/tinyobjloader-c) was added.

Metatables for generics and physics generics have also been
seperated out.
---
 src/client/lua_api/phys/cbphysmodel.cpp | 135 ++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 src/client/lua_api/phys/cbphysmodel.cpp

(limited to 'src/client/lua_api/phys/cbphysmodel.cpp')

diff --git a/src/client/lua_api/phys/cbphysmodel.cpp b/src/client/lua_api/phys/cbphysmodel.cpp
new file mode 100644
index 0000000..51ff2d8
--- /dev/null
+++ b/src/client/lua_api/phys/cbphysmodel.cpp
@@ -0,0 +1,135 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <vector>
+#include <memory>
+#include <map>
+#include <functional>
+#include <list>
+extern "C" {
+	#include <lua.h>
+	#include <lauxlib.h>
+	#include <lualib.h>
+}
+#include <btBulletDynamicsCommon.h>
+#include <irrlicht.h>
+#include "../gameparts.hpp"
+#include "cbphysbox.hpp"
+#include "cbphysmodel.hpp"
+#include <client/lua_api/scene/igeneric.hpp>
+#include <shared/lua_api/common.hpp>
+
+
+using namespace irr;
+using namespace scene;
+using namespace core;
+using namespace video;
+
+extern IrrlichtDevice* device;
+
+extern btDiscreteDynamicsWorld* World;
+extern std::list<btRigidBody*> Objects;
+
+//newbphysmodel("graphicfile","physicfile",mass,[,{position}][,{lookat}])
+static int newbphysmodel(lua_State* L){
+	printf("Creating bphysmodel\n");
+	int nargs = lua_gettop(L);
+	double lx,ly,lz;
+	double x,y,z;
+	if(nargs > 4){
+		//"graphicsfile","physicsfile",{position},{lookat}
+		popvector3d(L,&lx,&ly,&lz);
+	}
+	if(nargs > 3){
+		//"graphicsfile","physicsfile",{position}
+		popvector3d(L,&x,&y,&z);
+	}
+	//"graphicsfile","physicsfile"
+
+	double mass = lua_tonumber(L,-1);
+	const char *ppath = lua_tostring(L,-2);
+	const char *gpath = lua_tostring(L,-3);
+	lua_pop(L,3);
+
+	ISceneManager *smgr = device->getSceneManager();
+	
+	printf("bphysnode, creating the scene node\n");
+
+	//Create the scene node
+	IMesh *gmesh = smgr->getMesh(gpath);
+	ISceneNode *node = smgr->addMeshSceneNode(gmesh,0,-1,vector3df(x,y,z));
+
+	printf("bphysnode, createing the physics body\n");
+	//Create the physics body
+	IMesh *pmesh = smgr->getMesh(ppath);
+	printf("We have %d mesh buffers\n",pmesh->getMeshBufferCount());
+	u32 meshcount = pmesh->getMeshBufferCount();
+	btTriangleMesh* trimesh = new btTriangleMesh();
+	for(u32 meshnum = 0; meshnum < meshcount; meshnum++){
+		IMeshBuffer *b = pmesh->getMeshBuffer(meshnum);
+		//assert(b->getVertexType() == video::EVT_STANDARD);
+		u32 bi = b->getIndexCount();
+		u16 *indices = b->getIndices();
+		for(u32 i = 0; i < bi; i+= 3){
+			printf("Getting triangle %u of %u\n",i,bi);
+			u16 i1 = indices[i];
+			u16 i2 = indices[i + 1];
+			u16 i3 = indices[i + 2];
+			vector3df p1 = b->getPosition(i1);
+			vector3df p2 = b->getPosition(i2);
+			vector3df p3 = b->getPosition(i3);
+			btVector3 b1 = btVector3(p1.X,p1.Y,p1.Z) ;
+			btVector3 b2 = btVector3(p2.X,p2.Y,p2.Z) ;
+			btVector3 b3 = btVector3(p3.X,p3.Y,p3.Z) ;
+			trimesh->addTriangle(b1,b2,b3);
+		}
+	}
+	printf("Done building trimesh\n");
+	btCollisionShape *shape = new btBvhTriangleMeshShape(trimesh,true);
+	btTransform tr;
+	tr.setIdentity();
+	tr.setOrigin(btVector3(x,y,z));
+	printf("Created default motion shape\n");
+	btDefaultMotionState *ms = new btDefaultMotionState(btTransform(tr));
+	btVector3 li;
+	shape->calculateLocalInertia(mass, li);
+	btRigidBody *rb = new btRigidBody(mass,ms,shape,li);
+	rb->setUserPointer((void*) node);
+	World->addRigidBody(rb);
+	Objects.push_back(rb);
+	printf("Rigid body finished\n");
+
+	//Create the lua representation
+	lua_newtable(L);
+	lua_pushlightuserdata(L,rb);
+	lua_setfield(L,-2,"rigidbody");
+	lua_pushlightuserdata(L,node);
+	lua_setfield(L,-2,"node");
+	luaL_getmetatable(L,"phys.physmodel");
+	lua_setmetatable(L,-2);
+	printf("finished creating the lua representation\n");
+
+	return 1;
+}
+
+static const luaL_reg bphysmodel_f[] = {
+	{"newphysmodel",           newbphysmodel},
+	{0,0},
+};
+
+static const luaL_reg bphysmodel_m[] = {
+	{0, 0},
+};
+
+int cbphysmodel_register(lua_State* L){
+	//printf("bphysmodel registered\n");
+
+	luaL_newmetatable(L, "phys.physmodel");//{}
+	luaL_register(L,NULL,bphysmodel_m);
+	luaL_register(L,NULL,igeneric_m); //Inherit all the things to do with scene nodes
+	
+	lua_getglobal(L,"phys");
+	luaL_register(L,NULL,bphysmodel_f);
+
+	return 1;
+}
-- 
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