Huge refactor, Adding more code to engine from the game

draw.odin

@@ -1,6 +1,5 @@
-package ion
+package edit2d
 
-import "core:strings"
 import "base:runtime"
 import "core:fmt"
 import "core:math"

edit2d.odin

@@ -1,12 +1,16 @@
-package ion
+package edit2d
 
+import "base:intrinsics"
 
 import "core:encoding/cbor"
+import "base:runtime"
 import im "shared:odin-imgui"
 import "shared:odin-imgui/imgui_impl_glfw"
 import "shared:odin-imgui/imgui_impl_opengl3"
 import gl "vendor:OpenGL"
+import "core:fmt"
 import "vendor:glfw"
+import "core:reflect"
 
 
 
@@ -25,6 +29,7 @@ engine_state :: struct
 	drop_callback  : glfw.DropProc,
 	
 	input          : input_state,
+	
 }
 
 MAX_KEYS :: 512
@@ -38,13 +43,64 @@ input_state :: struct
 	curr, prev : [MAX_KEYS]bool,
 }
 
+
+//This function defines if the game's structs are defines as requirements 
+//Doing the checking in the beggining makes writing helper code more reliable
+engine_check_types :: proc($Game: typeid) 
+{
+	assert(intrinsics.type_has_field(Game, "levels"), "game should contan levels")
+	assert(intrinsics.type_has_field(Game, "engine"), "game should contan engine")
+
+	level_type  := reflect.struct_field_by_name(Game, "levels")
+	engine_type := reflect.struct_field_by_name(Game, "engine")
+
+	assert(engine_type.is_using, "You should be using the engine")
+	assert(engine_type.type.id == typeid_of(engine_game), "Engine Should be engine_game")
+
+	level_variant := level_type.type.variant
+
+	assert(reflect.is_dynamic_map(level_type.type), "Level should be map of names and level files")
+
+	level_map_type := level_type.type.variant.(runtime.Type_Info_Map)
+
+	assert(level_map_type.key.id == typeid_of(string), "Level key should be name")
+	//Level should also have engine
+
+	level_engine_type  := reflect.struct_field_by_name(level_map_type.value.id, "engine")
+
+	assert(level_engine_type.is_using, "Should be using engine")
+	assert(level_engine_type.type.id  == typeid_of(engine_world), "Should be using engine")
+
+	entities_type    := reflect.struct_field_by_name(level_map_type.value.id, "entities")
+	entity_defs_type := reflect.struct_field_by_name(level_map_type.value.id, "entity_defs")
+
+	assert(reflect.is_dynamic_array(entities_type.type))
+	assert(reflect.is_dynamic_array(entity_defs_type.type))
+
+	entities_arr    := entities_type.type.variant.(runtime.Type_Info_Dynamic_Array)
+	entity_defs_arr := entity_defs_type.type.variant.(runtime.Type_Info_Dynamic_Array)
+	entity_engine   := reflect.struct_field_by_name(entities_arr.elem.id,    "engine")
+	defs_engine     := reflect.struct_field_by_name(entity_defs_arr.elem.id, "engine")
+
+
+	assert(entity_engine.is_using, "Should be using")
+	assert(defs_engine.is_using, "Should be using")
+
+	assert(entity_engine.type.id == typeid_of(engine_entity))
+	assert(defs_engine.type.id   == typeid_of(engine_entity_def))
+
+}
+
 /*
 	This will only be called once to initilize the engine
 	initilize graphics library, glfw, callbacks
 */
-engine_init :: proc(state: ^engine_state) 
+engine_init :: proc($GameType : typeid,  state: ^engine_state) 
 {
 	
+
+	engine_check_types(GameType)
+
 	assert(glfw.Init() == true)
 	
 	glfw.WindowHint(glfw.SCALE_TO_MONITOR, 1)
@@ -105,6 +161,7 @@ engine_init :: proc(state: ^engine_state)
 
 }
 
+
 update_frame :: proc(state: ^engine_state)
 {
 	state.input.mouse_wheel = {}

entity.odin

@@ -1,4 +1,4 @@
-package ion
+package edit2d
 
 import b2 "vendor:box2d"
 import "core:fmt"
@@ -12,30 +12,13 @@ static_index_global :: struct
 	offset : b2.Vec2,
 }
 
+//DropProc               :: #type proc "c" (window: WindowHandle, count: c.int, paths: [^]cstring)
+
 /*
 	This file contains code to handle box2d stuffs of the game code
 	Don't put game's logic here
 */
 
-engine_world :: struct 
-{
-	world_id : b2.WorldId,
-	
-	//This in engine code?
-	static_indexes          : map[static_index]int `cbor:"-"`,
-	relations               : map[^static_index][dynamic]static_index_global `cbor:"-"`,
-	relations_serializeable : map[ static_index][dynamic]static_index_global,
-	
-	/*
-		Seems okay to put the joint defs in engine rather than in game because
-		we don't add more attributes in joints in the game
-
-		Can be changed later without requireing refactor
-	*/
-	revolute_joint_defs     : [dynamic]revolt_joint_def,
-	distant_joint_defs      : [dynamic]distance_joint_def,
-	joints                  : [dynamic]b2.JointId `cbor:"-"`,
-}
 
 engine_entity_flags_enum :: enum u64 {
 	POLYGON_IS_BOX,
@@ -75,6 +58,32 @@ engine_entity_def :: struct {
 	link_length_array : [dynamic]b2.Vec2,
 }
 
+default_engine_entity_def :: proc() -> engine_entity_def
+{
+	ret : engine_entity_def
+	ret.body_def   = b2.DefaultBodyDef()
+	ret.shape_def  = b2.DefaultShapeDef()
+	ret.shape_type = .polygonShape
+	ret.scale      = 1
+	ret.centers    = {{-10, 0}, {10, 0}}
+	ret.size       = {2, 2}
+	ret.radius     = 10
+	ret.body_count = 10
+	ret.rev_joint  = b2.DefaultRevoluteJointDef()
+
+	//for dynamic polygon
+	vs : [4]b2.Vec2 = {
+		{-1.0, -1.0},
+		{-1.0, 1.0},
+		{1.0, 1.0},
+		{1.0, -1.0},
+	}
+	ret.is_loop = true
+
+	for v in vs do append(&ret.vertices, v)
+	return ret
+}
+
 
 compare_engine_entity_def :: proc(a, b : engine_entity_def) -> bool
 {
@@ -118,6 +127,7 @@ engine_entity  :: struct {
 	joints        : [dynamic]b2.JointId,
 	entity_flags  : engine_entity_flags,
 	index         : ^static_index,
+	joint_id      : b2.JointId,
 } 
 
 
@@ -259,7 +269,11 @@ engine_entity_single_body :: proc(def : ^engine_entity_def, world_id: b2.WorldId
 	return new_entity
 }
 
-engine_create_chain_shape :: proc(def : ^engine_entity_def, world_id: b2.WorldId, index : i32) -> engine_entity
+engine_create_chain_shape :: proc(
+	def      : ^engine_entity_def,
+	world_id : b2.WorldId,
+	index    : i32
+	) -> engine_entity
 {
 	joint_def := def.rev_joint
 	orig_pos  := def.body_def.position 
@@ -296,6 +310,23 @@ engine_create_chain_shape :: proc(def : ^engine_entity_def, world_id: b2.WorldId
 }
 
 
+engine_create_entity :: proc(
+	def      : ^engine_entity_def,
+	world_id : b2.WorldId,
+	index    : i32
+	) -> engine_entity
+{
+
+	if .CHAIN not_in def.entity_flags
+	{
+		return engine_entity_single_body(def, world_id, index)
+	}
+	else 
+	{
+		return engine_create_chain_shape(def, world_id, index)
+	}
+
+}
 
 
 

game.odin

@@ -0,0 +1,14 @@
+package edit2d
+
+
+game_mode :: enum
+{
+	PLAY,
+	EDIT,
+}
+
+engine_game :: struct {
+	curr_level : string,
+	interface  : interface_state,
+	mode       : game_mode,
+}

handle_input.odin

@@ -0,0 +1,221 @@
+package edit2d
+
+import b2 "vendor:box2d"
+import im "shared:odin-imgui"
+import "vendor:glfw"
+import "base:runtime"
+
+/*
+	Handling input
+
+	Key Bindings
+
+	Meta keys
+		E        -> Cycle thru interface edit mode
+		CTRL + S -> Save level
+
+	CTRL + C -> Copy entity
+	CTRL + V -> Paste entity
+	ALT  + D -> Delete entity
+
+	CTRL + Mouse left -> Move according to edit mode
+	Mouse wheel       -> Scale according to edit mode
+	Mouse Left        -> select entity
+	Mouse Right       -> create new entity
+
+
+	TODO: 
+		Command mode?
+
+
+	Different handling of keys for different modes
+
+*/
+
+/*
+  Handle all keys when the editor is in entity mode
+
+	Select
+	Add 
+	Move
+	Delete
+	Copy paste 
+	Resize
+*/
+handle_entity_mode :: proc(
+	$E         : typeid,
+	state      : ^engine_state,
+	game_data  : ^$G,
+	) -> bool
+{
+	ret := false
+
+	click_query_filter :: proc "c" (
+		shape_id : b2.ShapeId,
+		ctx      : rawptr
+		) -> bool 
+	{
+		context   = runtime.default_context() 
+		game     := cast(^engine_game)ctx
+		index    := i32(uintptr(b2.Shape_GetUserData(shape_id)))
+
+		game.interface.selected_entity = index
+		return true
+	}
+
+	game: ^engine_game = game_data
+	interface := &game.interface
+	level     := &game_data.levels[game.curr_level] 
+	input     := &state.input
+	mpos      := camera_convert_screen_to_world(&state.draw.cam, input.mouse)
+
+	//Setlect entity
+	if is_key_pressed(state, glfw.MOUSE_BUTTON_LEFT)
+	{
+		aabb : b2.AABB = {mpos, mpos + 1}
+
+		r := b2.World_OverlapAABB(
+					level.engine.world_id,
+					aabb,
+					b2.DefaultQueryFilter(),
+					click_query_filter,
+					game,
+
+			)
+	}
+	else if is_key_pressed(state, glfw.MOUSE_BUTTON_RIGHT)
+	{
+		new_def := E {
+			engine = default_engine_entity_def(), 
+			type   = .NPC
+		}
+
+		interface.selected_entity = i32(len(level.entity_defs))
+		append(&level.entity_defs, new_def)
+		ret = true
+	}
+	else{
+
+		//Can only do these actions if a entity is selected
+		if interface.selected_entity != -1 && len(level.entity_defs) > 0
+		{
+
+			def := &level.entity_defs[interface.selected_entity]
+
+			//Copy paste
+			if  is_key_down(    state, glfw.KEY_LEFT_CONTROL)\\
+			 && is_key_pressed( state, glfw.KEY_C)
+			{
+				game_data.copied_def = def^
+			}
+			else if is_key_down( state, glfw.KEY_LEFT_CONTROL) \\
+			 && is_key_pressed(  state, glfw.KEY_V)
+			{
+
+				//Paste the copied def on the mouse position
+				interface.selected_entity = i32(len(level.entity_defs))
+				game_data.copied_def.body_def.position = mpos
+				append(&level.entity_defs, game_data.copied_def)
+				ret = true
+			}
+			else if is_key_down( state, glfw.KEY_LEFT_CONTROL) \\
+			 && is_key_pressed(  state, glfw.KEY_D)
+			{
+				//Remove the def
+				unordered_remove(&level.entity_defs, interface.selected_entity)
+				interface.selected_entity = -1
+				ret = true
+			}
+			else if is_key_down( state, glfw.KEY_LEFT_CONTROL) \\
+			 && is_key_down(  state, glfw.MOUSE_BUTTON_LEFT)
+			{
+				//move def
+				def.body_def.position = mpos
+				ret = true
+			}
+			else if state.input.mouse_wheel.y != 0
+			{
+				def.scale += f32(state.input.mouse_prev.y / 5)
+				ret  = true
+			}
+
+		}
+
+
+	}
+	return ret
+}
+
+
+
+handle_input :: proc(
+	$E         : typeid,
+	state      : ^engine_state,
+	game_data  : ^$G,
+) -> bool
+{
+
+	game : ^engine_game = &game_data.engine
+
+	/* 
+	Applies for all mode
+	 */
+
+	level := &game_data.levels[game.curr_level]
+
+	if is_key_pressed(state, glfw.KEY_E)
+	{
+		interface := &game.interface
+		if interface.edit_mode == max(EditMode)
+		{
+			interface.edit_mode = min(EditMode)
+		}else
+		{
+			new_val := int(interface.edit_mode) + 1
+			interface.edit_mode = EditMode(new_val)
+		}
+	}
+
+	if is_key_pressed(state, glfw.KEY_S) && \\
+	 is_key_down(state, glfw.KEY_LEFT_CONTROL)
+	{
+		level_save_to_file(level, state)
+	}
+
+	if im.GetIO().WantCaptureMouse    do return false
+	if im.GetIO().WantCaptureKeyboard do return false
+
+
+
+
+	#partial switch game.interface.edit_mode
+	{
+		case .ENTITY : handle_entity_mode(E, state, game_data)
+		// case .VERTICES : interface_handle_vertices_mode(state, game_data)
+		// case .OVERVIEW : interface_handle_overview_mode(state, game_data)
+		// case .CHAIN    : interface_handle_chain_mode(state, game_data)
+		// case .JOINT    : interface_handle_joint_mode(state, game_data)
+	}
+
+	return false
+
+
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

interface.odin

@@ -1,7 +1,6 @@
-package ion
+package edit2d
-import "core:slice"
-import "core:fmt"
 import im "shared:odin-imgui"
+import "core:fmt"
 import b2 "vendor:box2d"
 
 /*
@@ -27,7 +26,7 @@ interface_state :: struct
 {
 	entity_defs       : [dynamic]^engine_entity_def,
 	entities          : [dynamic]^engine_entity,
-	selected_entity   : ^i32,
+	selected_entity   : i32,
 	world             : ^engine_world,
 	state             : ^engine_state,
 
@@ -42,6 +41,15 @@ interface_state :: struct
 	curr_static_index : static_index_global,
 }
 
+interface_get_default :: proc(interface: ^interface_state)
+{
+	interface.selected_entity  = 0
+	interface.vertex_index     = new(i32)
+	interface.vertex_index^    = 0
+	interface.chain_index      = new(i32)
+	interface.chain_index^     = 0
+}
+
 interface_draw_options :: proc(state: ^engine_state) {
 	debug_draw := &state.draw.debug_draw
 
@@ -66,6 +74,23 @@ interface_draw_options :: proc(state: ^engine_state) {
 interface_all :: proc(interface: ^interface_state) -> bool 
 {
 	ret := false
+	if interface.selected_entity <0
+	{
+		interface.selected_entity = 0
+	}
+
+	if im.Begin("Edit Mode", nil)
+	{
+    for type in EditMode
+    {
+      if im.RadioButton(fmt.ctprint(type), interface.edit_mode == type) 
+      {
+        interface.edit_mode = type
+      }
+    }
+	}
+	im.End()
+
 	if im.Begin("Box2d interface") 
 	{
 		if im.BeginTabBar("Tabs") 
@@ -77,7 +102,6 @@ interface_all :: proc(interface: ^interface_state) -> bool
 				im.EndTabItem()
 			}
 
-
 			if im.BeginTabItem("Joints", nil, {})
 			{
 				if interface_joints(interface) do ret = true

interface_entity.odin

@@ -1,4 +1,4 @@
-package ion
+package edit2d
 
 import b2 "vendor:box2d"
 import im "shared:odin-imgui"
@@ -62,7 +62,7 @@ interface_edit_static_index :: proc(interface:^interface_state, def: ^engine_ent
 {
 	
 	curr_index  := &interface.curr_static_index
-	entity := interface.entities[interface.selected_entity^] 
+	entity := interface.entities[interface.selected_entity] 
 	
 	level   := interface.world
 	
@@ -216,11 +216,11 @@ interface_shape_def_editor :: proc(def: ^engine_entity_def) -> bool
 
 interface_entity :: proc(interface: ^interface_state) -> bool 
 {
-	entity_selected := (interface.selected_entity^ != -1) && len(interface.entity_defs) > 0
+	entity_selected := (interface.selected_entity != -1) && len(interface.entity_defs) > 0
 	
 	if entity_selected
 	{
-		def     := interface.entity_defs[interface.selected_entity^]
+		def     := interface.entity_defs[interface.selected_entity]
 		def_old := def^
 		
 		ret := false

interface_joints.odin

@@ -1,4 +1,4 @@
-package ion
+package edit2d
 
 import "core:fmt"
 import b2 "vendor:box2d"

level.odin

@@ -0,0 +1,414 @@
+package edit2d
+
+import "core:strings"
+import "core:os"
+import "core:bytes"
+import "core:path/filepath"
+import "core:crypto/hash"
+import "core:time"
+import b2 "vendor:box2d"
+import "core:fmt"
+import "core:encoding/cbor"
+
+/*
+	The engine can provide helper functions so that it'll be easier to write 
+	the level code in the game 
+
+	A Typical level code
+*/
+
+engine_world :: struct {
+	world_id : b2.WorldId,
+	
+	//This in engine code?
+	static_indexes          : map[static_index]int `cbor:"-"`,
+	relations               : map[^static_index][dynamic]static_index_global `cbor:"-"`,
+	relations_serializeable : map[ static_index][dynamic]static_index_global,
+
+	
+	/*
+		Seems okay to put the joint defs in engine rather than in game because
+		we don't add more attributes in joints in the game
+
+		Can be changed later without requireing refactor
+	*/
+	revolute_joint_defs     : [dynamic]revolt_joint_def,
+	distant_joint_defs      : [dynamic]distance_joint_def,
+	joints                  : [dynamic]b2.JointId `cbor:"-"`,
+	cam                     : Camera,
+	name                    : string,
+}
+
+@(require_results)
+time_to_string_hms :: proc(t: time.Time, buf: []u8) -> (res: string) #no_bounds_check {
+	assert(len(buf) >= time.MIN_HMS_LEN)
+	h, m, s := time.clock(t)
+
+	buf[7] = '0' + u8(s % 10); s /= 10
+	buf[6] = '0' + u8(s)
+	buf[5] = '-'
+	buf[4] = '0' + u8(m % 10); m /= 10
+	buf[3] = '0' + u8(m)
+	buf[2] = '-'
+	buf[1] = '0' + u8(h % 10); h /= 10
+	buf[0] = '0' + u8(h)
+
+	return string(buf[:time.MIN_HMS_LEN])
+}
+
+cbor_flags : cbor.Encoder_Flags : 
+{
+	.Self_Described_CBOR, 
+	.Deterministic_Int_Size, 
+	.Deterministic_Float_Size, 
+}
+
+level_load_from_files :: proc(
+	$G, $L, $E: typeid, 
+	game: ^G,
+	state: ^engine_state
+	)
+{
+	files, err := os.read_all_directory_by_path("levels", context.allocator)
+	
+	for file in files 
+	{
+		if !os.exists(file.fullpath) do continue
+		if os.is_dir(file.fullpath) do continue
+
+		level_name := strings.clone(filepath.stem(file.fullpath))
+		game.levels[level_name] = {}
+		game.curr_level = strings.clone(level_name)
+		level_init_from_path(L, E, &game.levels[level_name], file.fullpath, state)
+	}
+}
+
+
+//Returns engine_world by reading from the file
+
+
+/*
+	In the user code
+
+	level_name = strings.clone(filepath.stem(path))
+	game.levels[level_name] = {}
+
+	level_init_from_path(&game.levels[level_name], path)
+
+*/
+//We don't want the user to configure and use cbor everytime so we want to handle it
+//
+level_init_from_path :: proc(
+	$T, $E: typeid,
+	level_data : ^T,
+	path : string, 
+	state: ^engine_state,
+	) -> (ret : bool)
+{
+
+	level := cast(^engine_world)level_data
+
+	if os.is_file(path)
+	{
+
+		level_name     := strings.clone(filepath.stem(path))
+		data, err      := os.read_entire_file_from_path(path, context.allocator)
+		level.name      = level_name
+
+		//?
+		level.relations = {}
+		level.relations = make(map[^static_index][dynamic]static_index_global)
+
+		if len(data) > 0
+		{
+
+			unmarshall_err := cbor.unmarshal(data, level_data)
+			delete(data)
+
+			if unmarshall_err == nil
+			{
+
+				level_reload(T, E, level_data)
+				state.draw.cam = level.cam
+
+				for key, val in level.relations_serializeable
+				{
+					index  := level.static_indexes[key]
+					entity := level_data.entities[index]
+
+					level_data.relations[entity.index] = {}
+					for v in val do append(&level.relations[entity.index], v)
+				}
+
+				ret = true
+			}else
+			{
+				ret = false
+				fmt.eprintf("Faield to unmarshall file %s \n", unmarshall_err)
+			}
+
+		}else
+		{
+			level_reload(T, E, level_data)
+			state.draw.cam = level.cam
+
+			for key, val in level.relations_serializeable
+			{
+				index  := level.static_indexes[key]
+				entity := level_data.entities[index]
+
+				level_data.relations[entity.index] = {}
+				for v in val do append(&level.relations[entity.index], v)
+			}
+
+			//Handle no data
+			fmt.println("Empty level")
+			ret = false
+		}
+
+	}else
+	{
+		fmt.eprintln("File not exist or is a directory")
+		ret = false
+	}
+
+	return 
+}
+
+/*
+	We can't create the entities
+	That should be done by the user
+*/
+level_reload :: proc($T: typeid, $E: typeid, level: ^T)
+{
+	clear(&level.entities)
+	clear(&level.static_indexes)
+
+	if level.world_id != b2.nullWorldId do b2.DestroyWorld(level.world_id)
+
+	//initilize world
+	{
+		world_def    := b2.DefaultWorldDef()
+		b2.SetLengthUnitsPerMeter(100)
+
+		//Get the gravity from config
+		world_def.gravity = {0, -9.8 * 100}
+		level.world_id    = b2.CreateWorld(world_def)
+	}
+
+	for &def, i in &level.entity_defs
+	{
+		//new_entity := engine_create_entity(&def, level.world_id, i32(i))
+		new_entity : E
+		new_entity.type   = def.type
+		new_entity.engine = engine_create_entity(&def, level.world_id, i32(i))
+
+		//new_entity := entity_create_by_type(&def, level.world_id, i32(i))
+		
+		append(&level.entities, new_entity)
+		
+		if new_entity.index != nil do level.static_indexes[new_entity.index^] = i
+
+		//if new_entity.type  == .PLAYER do level.player_index = i32(i)
+
+	}
+
+	{
+		for &def in &level.distant_joint_defs
+		{
+			//Get entity_a and entity_b
+
+			if def.entity_a <= 0 do continue
+			if def.entity_b <= 0 do continue
+
+			entity_a   := &level.entities[level.static_indexes[def.entity_a]]
+			def.bodyIdA = entity_a.body_id
+
+			entity_b   := &level.entities[level.static_indexes[def.entity_b]]
+			def.bodyIdB = entity_b.body_id
+
+			append(&level.joints, b2.CreateDistanceJoint(level.world_id, def.def))
+		}
+
+		for &def in &level.revolute_joint_defs
+		{
+			//Get entity_a and entity_b
+
+			if def.entity_a <= 0 do continue
+			if def.entity_b <= 0 do continue
+
+			entity_a   := &level.entities[level.static_indexes[def.entity_a]]
+			def.bodyIdA = entity_a.body_id
+
+			entity_b   := &level.entities[level.static_indexes[def.entity_b]]
+			def.bodyIdB = entity_b.body_id
+
+			append(&level.joints, b2.CreateRevoluteJoint(level.world_id, def.def))
+		}
+	}
+	//level.player.e = &level.entities[level.player_index]
+}
+
+
+/*
+	Saves the level to the levels directory using level's name as filename
+	It uses core library's hash and cbor to searialize the level into bytes
+
+	It assumes that it uses engine_world struct as it's first member
+
+	Checks hash of current level state and file's hash
+	If both hash is same the exits
+*/
+
+level_save_to_file :: proc(level_data: ^$T, state: ^engine_state)
+{
+
+	level      := cast(^engine_world)level_data
+	level_path := fmt.tprintf("levels/%s.cbor", level.name)
+
+	level.cam = state.draw.cam
+	fmt.println(level_path)
+
+	//Relation serializeable
+	{
+		clear(&level.relations_serializeable)
+		for key, val in &level.relations
+		{
+			if key != nil
+			{
+				level.relations_serializeable[key^] = {}
+				for v in val do append(&level.relations_serializeable[key^], v)
+			}
+		}
+	}
+
+	binary, cbor_err := cbor.marshal_into_bytes(level_data^, cbor_flags)
+
+	if cbor_err == nil
+	{
+	}else
+	{
+		fmt.eprintf("Failed to marshall level %s \n", cbor_err)
+		return
+	}
+
+
+	//Get hash of current loaded game and current saved game
+	binary_hash         := hash.hash_bytes(.SHA3_512, binary)
+	fmt.println(binary_hash)
+	file_hash, hash_err := hash.hash_file_by_name(.SHA3_512, level_path)
+
+	//If the hash is same that means no changes has been made
+
+
+	if bytes.compare(binary_hash, file_hash) != 0
+	{
+
+		if !os.exists("levels")
+		{
+			err := os.mkdir("levels")
+			if err != nil
+			{
+				fmt.println("Failed to create levels directory")
+				fmt.println(err)
+			}
+		}
+
+		/* 
+			Create backeup before saving to file
+
+			We create backup by copying the current level file to the backup directory
+			Backup directory will contain the date and time of the backup
+		*/
+
+
+		if os.exists(level_path)
+		{
+			//Get time and date to create file and folder name for backup
+			curr_time := time.now()
+
+			buf      : [time.MIN_YYYY_DATE_LEN]u8
+			time_buf : [time.MIN_HMS_LEN]u8
+			date_str := time.to_string_yyyy_mm_dd(curr_time, buf[:])
+			time_str := time_to_string_hms(curr_time, time_buf[:])
+
+			backup_dir_path  := fmt.tprintf("levels/backups/%s",date_str)
+			backup_file_path := fmt.tprintf("levels/backups/%s/%s-%s", date_str, level.name, time_str)
+		
+			bk_err := os.make_directory_all(backup_dir_path)
+
+			if bk_err != nil
+			{
+				fmt.eprintf("Failed to create backup directory %s \n", bk_err)
+			}
+			else{
+				bk_err := os.copy_file(backup_file_path, level_path)
+
+				if bk_err != nil
+				{
+					fmt.eprintf("Failed to copy file %s\n", bk_err)
+				}
+			}
+		}
+
+		//Save the current binary to file
+		save_err := os.write_entire_file_from_bytes(level_path, binary)
+
+		if save_err != nil
+		{
+			fmt.eprintf("Failed to save level %s\n", save_err)
+		}
+	
+
+	}else{
+		fmt.println("No changes detected")
+	}
+}
+
+
+/*
+	The engine assumes that it has attribute entities
+*/
+game_to_engine_entities :: proc($Game: typeid, game_data: ^Game, state: ^engine_state)
+{
+	level     := &game_data.levels[game_data.curr_level]
+
+	interface : ^interface_state = &game_data.interface
+
+	clear(&interface.entities)
+	clear(&interface.entity_defs)
+
+	for &entity in &level.entities    
+	{
+		append(&interface.entities,    &entity.engine)
+	}
+	for &def    in &level.entity_defs 
+	{
+		append(&interface.entity_defs, &def.engine)
+	}
+
+	interface.state = state
+	interface.world = &level.engine
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

misc.odin

@@ -1,4 +1,4 @@
-package ion
+package edit2d
 
 import "core:slice"
 import b2 "vendor:box2d"