Merge pull request 'Chunking system, save/load chunks' (#1) from chunking into master

Reviewed-on: https://git.bellsworne.tech/chrisbell/odin-raylib-game/pulls/1
2025-02-28 14:40:36 +00:00 · 2025-02-28 14:40:36 +00:00 · f29fad7168
commit f29fad7168
parent 22f9af5417 0d25cbb38a
7 changed files with 374 additions and 107 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,2 @@
+bin/
+game/data
--- a/game/game
+++ b/game/game
--- a/game/game.odin
+++ b/game/game.odin
@ -2,39 +2,49 @@ package game

 import "core:fmt"
 import rl "vendor:raylib"
-import rand "core:math/rand"
-import "core:strconv"
-import "core:mem"
-import "core:strings"
+import "core:os"


 player : Player
 world : World

-camera : rl.Camera2D
-
 main :: proc() {

+    if !os.is_dir("data") {
+        os.make_directory("data")
+    }
+
+    if !os.is_dir("data/worlds") {
+        os.make_directory("data/worlds")
+    }
+
    rl.InitWindow(1280, 720, "Odin game")
+    
    flags : rl.ConfigFlags = {.VSYNC_HINT} 
    rl.SetConfigFlags(flags)

    rl.SetTargetFPS(60)

-    player.position.x = CELL_SIZE * 5
-    player.position.y = CELL_SIZE * 5
-    player.mode = .INTERACT

-    camera.target = {player.position.x + (CELL_SIZE / 2), player.position.y + (CELL_SIZE / 2)}
-    camera.zoom = 2
-    camera.offset = {f32(rl.GetScreenWidth()) / 2, f32(rl.GetScreenHeight()) / 2}
+    player = {
+        position = {CELL_SIZE * 10, CELL_SIZE * 10},
+        camera = {
+            zoom = 3,
+            target = {player.position.x + (CELL_SIZE / 2), player.position.y + (CELL_SIZE / 2)},
+            offset = {f32(rl.GetScreenWidth()) / 2, f32(rl.GetScreenHeight()) / 2},
+        },
+        mode = .INTERACT,
+    }

    load_tilemap()
    defer unload_tilemap()

-    fill_world_grid_with_nothing(&world)
+    world = create_world("test_world")
+
+    set_tile(&world, tree_tile, {400,400})
+
+    save_world(&world)

-    place_random_trees(&world)

    game_loop()
 }
@ -50,7 +60,7 @@ game_loop :: proc() {

        rl.BeginDrawing()
        rl.ClearBackground(rl.BLACK)
-        rl.BeginMode2D(camera)
+        rl.BeginMode2D(player.camera)

        draw()

@ -59,8 +69,8 @@ game_loop :: proc() {
        rl.DrawFPS(5,5)

        player_grid_pos := get_player_grid_position(&player)
-        player_grid_pos_tile := get_grid_tile(&world, vec2_to_vec2i(player_grid_pos))
-        status_string := rl.TextFormat("POS: %v : %v | MODE: %v", player_grid_pos, player_grid_pos_tile.type, player.mode)
+        player_grid_pos_tile := get_world_tile(&world, vec2_to_vec2i(player_grid_pos))
+        status_string := rl.TextFormat("POS: [%i,%i] : %v | MODE: %v", int(player_grid_pos.x), int(player_grid_pos.y), player_grid_pos_tile.type, player.mode)

        rl.DrawText(status_string, 5, 25, 20, rl.RED)

@ -73,11 +83,7 @@ game_loop :: proc() {
 }

 update :: proc() {
-    
-    handle_player_input(&player, &world)
-    handle_window_resize()
-    camera.target = {player.position.x + (CELL_SIZE / 2), player.position.y + (CELL_SIZE / 2)}
-
+    player_update(&player, &world)
 }

 draw :: proc() {
@ -85,16 +91,3 @@ draw :: proc() {
    draw_player(&player)
 }

-handle_window_resize :: proc() {
-    if rl.IsWindowResized() {
-        camera.offset = {f32(rl.GetScreenWidth()) / 2, f32(rl.GetScreenHeight()) / 2}
-    }
-}
-
-print_grid :: proc() {
-    for x in 0..< len(world.grid) {
-        for y in 0..< len(world.grid) {
-            fmt.printfln("[%d, %d] %v", x, y, world.grid[x][y].type)
-        }
-    } 
-}
--- a/game/math.odin
+++ b/game/math.odin
@ -1,8 +1,8 @@
 package game

 Vec2i :: struct {
-    x: u32,
-    y:u32,
+    x: int,
+    y: int,
 }

 vec2i_to_vec2 :: proc(v2i:Vec2i) -> [2]f32 {
@ -10,5 +10,17 @@ vec2i_to_vec2 :: proc(v2i:Vec2i) -> [2]f32 {
 }

 vec2_to_vec2i :: proc(v2:[2]f32) -> Vec2i {
-    return {u32(v2.x), u32(v2.y)}
+    return {int(v2.x), int(v2.y)}
+}
+
+to_bytes :: proc(v: $T) -> [size_of(T)]u8 {
+    val := v
+    encoded_bytes := (^[size_of(T)]u8)(&val)
+    return encoded_bytes^
+}
+
+from_bytes :: proc($T:typeid, data: [size_of(T)]u8) -> T {
+    bytes := data
+    decoded_value := (^T)(&bytes)^
+    return decoded_value
 }
--- a/game/player.odin
+++ b/game/player.odin
@ -3,10 +3,13 @@ package game
 import rl "vendor:raylib"
 import "core:fmt"

+CHUNK_UNLOAD_DISTANCE :: 3
+
 Player :: struct {
    position : rl.Vector2,
    move_timer: f32,
-    mode: InteractMode
+    mode: InteractMode,
+    camera: rl.Camera2D,
 }

 InteractMode :: enum {
@ -14,52 +17,118 @@ InteractMode :: enum {
    ATTACK,
 }

-handle_player_input :: proc(p : ^Player, w: ^World) {
+handle_player_camera :: proc(p:^Player) {
+    p.camera.target = {p.position.x + (CELL_SIZE / 2), p.position.y + (CELL_SIZE / 2)}

+    if rl.IsWindowResized() {
+        p.camera.offset = {f32(rl.GetScreenWidth()) / 2, f32(rl.GetScreenHeight()) / 2}
+    }
+}
+
+player_update :: proc(p : ^Player, w: ^World) {
+    handle_player_input(p,w)
+    handle_player_camera(p)
+    
+    if rl.IsKeyPressed(.SPACE) {
+        set_tile(w, tree_tile, vec2_to_vec2i(get_player_grid_position(p)))
+    }
+}
+
+player_update_chunks :: proc(p: ^Player, w: ^World) {
+    player_grid_pos := get_player_grid_position(p)
+    current_player_chunk := get_chunk_from_world_pos(w, player_grid_pos)
+
+    directions := [8]Vec2i{
+        Vec2i{  1,  0 }, Vec2i{ -1,  0 }, // Right, Left
+        Vec2i{  0,  1 }, Vec2i{  0, -1 }, // Down, Up
+        Vec2i{  1,  1 }, Vec2i{ -1, -1 }, // Bottom-right, Top-left
+        Vec2i{  1, -1 }, Vec2i{ -1,  1 }, // Top-right, Bottom-left
+    }
+
+    // Always ensure the current chunk is loaded
+    get_chunk(w, current_player_chunk.position)
+
+    // Load adjacent chunks 
+    for dir in directions {
+        adjacent_pos := Vec2i{ 
+            current_player_chunk.position.x + dir.x, 
+            current_player_chunk.position.y + dir.y 
+        }
+
+        get_chunk(w, adjacent_pos)
+    }
+
+    // Unload non-adjacent chunks
+    for chunk_pos in w.chunks {
+        if chunk_pos == current_player_chunk.position {
+            continue
+        }
+
+        is_adjacent := false
+        for dir in directions {
+            check_pos := Vec2i{ 
+                current_player_chunk.position.x + dir.x, 
+                current_player_chunk.position.y + dir.y 
+            }
+            if chunk_pos == check_pos {
+                is_adjacent = true
+                break
+            }
+        }
+
+        if !is_adjacent {
+            unload_chunk(chunk_pos, w)
+        }
+    }
+}
+
+handle_player_input :: proc(p:^Player, w:^World) {
    target_pos := get_player_grid_position(p)

    dt := rl.GetFrameTime()
-    move_delay : f32 = 0.15
+    move_delay : f32 = 0.2

    if p.move_timer > 0 {
        p.move_timer -= dt
    }
    
-    
-    // fmt.printfln("MOVING TO: %v : %v", target_pos, get_grid_tile(w, vec2_to_vec2i(target_pos)).type)
-
    if p.move_timer <= 0 {
        if rl.IsKeyDown(.D) {
            target_pos.x += 1
-            if !will_collide(target_pos, w) {
+            if !will_collide(w, target_pos) {
                player.position.x += CELL_SIZE
                p.move_timer = move_delay
+                player_update_chunks(p,w)
            }
        }

        if rl.IsKeyDown(.A) {
            target_pos.x -= 1
-            if !will_collide(target_pos, w) {
+            if !will_collide(w, target_pos) {
                player.position.x -= CELL_SIZE
                p.move_timer = move_delay
-            }
+                player_update_chunks(p,w)
+           }
        }

        if rl.IsKeyDown(.W) {
            target_pos.y -= 1
-            if !will_collide(target_pos, w) {
+            if !will_collide(w, target_pos) {
                player.position.y -= CELL_SIZE
                p.move_timer = move_delay
-            }
+                player_update_chunks(p,w)
+           }
        }

        if rl.IsKeyDown(.S) {
            target_pos.y += 1
-            if !will_collide(target_pos, w) {
+            if !will_collide(w, target_pos) {
                p.move_timer = move_delay
                player.position.y += CELL_SIZE
-            }
+                player_update_chunks(p,w)
+           }
        }
+
    }
 }

@ -74,12 +143,13 @@ draw_player :: proc(player:^Player) {
    draw_tile({27,0}, player.position, rl.DARKBLUE)
 }

-will_collide :: proc(pos:rl.Vector2, w:^World) -> bool {
-    if pos.y > WORLD_SIZE * CELL_SIZE || pos.x > WORLD_SIZE * CELL_SIZE {
-        return false
-    }
+will_collide :: proc(w:^World, pos:rl.Vector2) -> bool {
+    world_grid_pos := vec2_to_vec2i(pos)
+    chunk_pos := world_pos_to_chunk_pos(pos)
+    local_pos := get_local_chunk_pos(world_grid_pos)

-    tile := get_grid_tile(w, vec2_to_vec2i(pos))
+    chunk := get_chunk(w, chunk_pos)
+    tile := get_chunk_tile(chunk, local_pos)

    #partial switch tile.type {
    case .WALL:
--- a/game/tiles.odin
+++ b/game/tiles.odin
@ -3,21 +3,43 @@ package game
 import rl "vendor:raylib"
 import "core:math/rand"

+Tile :: struct #packed {
+    tilemap_pos: Vec2i,
+    color: [4]u8,
+    type: TileType,
+    interaction: InteractionType,
+    resource: ResourceType,
+}
+
+TileType :: enum u8 {
+    NOTHING,
+    WALL,
+    FOLIAGE,
+}
+
+ResourceType :: enum u8 {
+    NOTHING,
+    TREE,
+}
+
+InteractionType :: enum u8 {
+    NOTHING,
+    RESOURCE,
+    ENEMY,
+}
+
+nothing_tile := Tile {
+    type = .FOLIAGE,
+    tilemap_pos = {1,2},
+    color = {30,30,0,255},
+    interaction = .NOTHING,
+    resource = .NOTHING
+}
+
 tree_tile := Tile {
    type = .WALL,
    tilemap_pos = {0,1},
-    color = rl.DARKGREEN
-}
-
-place_random_trees :: proc(w:^World) {
-    for x in 0..< len(w.grid) {
-        for y in 0..< len(w.grid) {
-
-            chance := rand.int_max(100)
-            
-            if chance <= 5 {
-                w.grid[x][y] = tree_tile
-            }
-        }
-    }
+    color = {17,87,30,255},
+    resource = .TREE,
+    interaction = .RESOURCE,
 }
--- a/game/world.odin
+++ b/game/world.odin
@ -2,60 +2,228 @@ package game

 import rl "vendor:raylib"
 import "core:fmt"
-
+import "core:os"
+import "core:path/filepath"
+import "core:mem"

 CELL_SIZE :: 16
-WORLD_SIZE :: 100
+CHUNK_SIZE :: 32
+WORLD_DATA_PATH :: "data/worlds"

 World :: struct {
-    grid: [WORLD_SIZE][WORLD_SIZE]Tile
+    data_dir: string,
+    chunks: map[Vec2i]Chunk
 }

-Tile :: struct {
-    type: TileType,
-    tilemap_pos:rl.Vector2,
-    color:rl.Color,
+Chunk :: struct #packed {
+    position: Vec2i,
+    tiles: [CHUNK_SIZE][CHUNK_SIZE]Tile,
 }

-TileType :: enum {
-    NOTHING,
-    WALL,
-    DOOR,
-    FLOOR,
-} 
-
-set_grid_tile :: proc(w:^World, pos:Vec2i, t:Tile) {
-    w.grid[pos.x][pos.y] = t
-}
-
-get_grid_tile :: proc(w: ^World, pos: Vec2i) -> Tile {
-    if pos.x < 0 || pos.x >= len(w.grid) || pos.y < 0 || pos.y >= len(w.grid[0]) {
-        // fmt.printfln("Target [%v] outside of world bounds", pos)
-        return w.grid[0][0] // Default or error tile
+create_world :: proc(name:string) -> World {
+    data_dir := fmt.tprintf("%v/%v", WORLD_DATA_PATH, name)
+    if !os.is_dir(data_dir) {
+        fmt.printfln("Data dir: %v does not exist", data_dir)
+        os.make_directory(data_dir)
+    }
+
+    chunk_dir := fmt.tprintf("%v/%v", data_dir, "chunks")
+    if !os.is_dir(chunk_dir) {
+        os.make_directory(chunk_dir)
+    }
+
+    return World {
+        data_dir = data_dir,
+        chunks = make(map[Vec2i]Chunk), 
    }
-    return w.grid[pos.x][pos.y]
 }

-fill_world_grid_with_nothing :: proc(w:^World) {
-    for x in 0..< len(w.grid) {
-        for y in 0..<len(w.grid) {
-            w.grid[x][y] = Tile {
-                type = .NOTHING,
-                tilemap_pos = {0,0}
-            }
+load_world :: proc(name:string) -> World {
+    dir := fmt.tprintf("%v/%v", WORLD_DATA_PATH, name)
+    if !os.is_dir(dir) {
+        panic("Couldnt load world")
+    }
+
+    return World {
+        data_dir = dir,
+        chunks = make(map[Vec2i]Chunk),
+    }
+}
+
+save_world :: proc(w:^World) {
+    if !os.is_dir(w.data_dir) {
+        panic("World has invalid data_path")
+    }
+
+    // fmt.printfln("Saving world %v", w.data_dir)
+
+    for chunk in w.chunks {
+        save_chunk(get_chunk(w, chunk), w)
+    }
+}
+
+save_chunk :: proc(c:^Chunk, w:^World) {
+    chunk_dir := fmt.tprintf("%v/%v", w.data_dir, "chunks")
+    filename := fmt.tprintf("%v/%v_%v.chunk", chunk_dir, c.position.x, c.position.y)
+
+    // fmt.printfln("Saving chunk: %v", filename)
+
+    data := make([dynamic]u8)
+
+    // Append Position
+    for byte in transmute([size_of(int)]u8)c.position.x {append(&data, byte)} 
+    for byte in transmute([size_of(int)]u8)c.position.y {append(&data, byte)} 
+
+    // Append Tiles
+    for row in &c.tiles {
+        for tile in row {
+            for byte in transmute([size_of(int)]u8)tile.tilemap_pos.x {append(&data, byte)}
+            for byte in transmute([size_of(int)]u8)tile.tilemap_pos.y {append(&data, byte)}
+            for byte in transmute([4]u8)tile.color {append(&data, byte)}
+            for byte in transmute([size_of(TileType)]u8)tile.type {append(&data, byte)}
+            for byte in transmute([size_of(InteractionType)]u8)tile.interaction {append(&data, byte)}
+            for byte in transmute([size_of(ResourceType)]u8)tile.resource {append(&data, byte)}
        }
    }
+
+    err := os.write_entire_file_or_err(filename, data[:])
+    
 }

+load_chunk :: proc(pos:Vec2i, w:^World) -> Chunk {
+    chunk_dir := fmt.tprintf("%v/%v", w.data_dir, "chunks")
+    filename := fmt.tprintf("%v/%v_%v.chunk", chunk_dir, pos.x, pos.y)
+
+    data, err := os.read_entire_file_from_filename_or_err(filename)
+    if err != nil {
+        // fmt.printfln("No chunk %v found, generating new chunk", pos)
+        chunk := generate_chunk(pos)
+        save_chunk(&chunk, w)
+        return chunk
+    }
+
+    chunk: Chunk
+    offset := 0
+
+    // Load Position
+    mem.copy(transmute([^]u8)&chunk.position.x, &data[offset], size_of(int))
+    offset += size_of(int)
+    mem.copy(transmute([^]u8)&chunk.position.y, &data[offset], size_of(int))
+    offset += size_of(int)
+
+    // Load tiles
+    for row_index := 0; row_index < len(chunk.tiles); row_index += 1 {
+        for tile_index := 0; tile_index < len(chunk.tiles[row_index]); tile_index += 1 {
+            tile := &chunk.tiles[row_index][tile_index] // Get address of tile
+            mem.copy(&tile.tilemap_pos.x, &data[offset], size_of(int))
+            offset += size_of(int)
+            mem.copy(&tile.tilemap_pos.y, &data[offset], size_of(int))
+            offset += size_of(int)
+
+            // Load color
+            color_temp: [4]u8
+            mem.copy(&color_temp, &data[offset], 4)
+            tile.color = color_temp
+            offset += 4
+
+            mem.copy(&tile.type, &data[offset], size_of(TileType))
+            offset += size_of(TileType)
+            mem.copy(&tile.interaction, &data[offset], size_of(InteractionType))
+            offset += size_of(InteractionType)
+            mem.copy(&tile.resource, &data[offset], size_of(ResourceType))
+            offset += size_of(ResourceType)
+        }
+    }
+
+    return chunk
+
+}
+
+unload_chunk :: proc(pos:Vec2i, w:^World) {
+    _, exists := w.chunks[pos]
+    if exists {
+        save_chunk(get_chunk(w, pos), w)
+        delete_key(&w.chunks, pos)
+    } 
+}
+
+generate_chunk :: proc(pos:Vec2i) -> Chunk {
+    chunk := Chunk {position = pos}
+
+    for x in 0..<CHUNK_SIZE {
+        for y in 0..<CHUNK_SIZE {
+            chunk.tiles[x][y] = nothing_tile 
+        }
+    }
+
+    center_pos := Vec2i{CHUNK_SIZE/2, CHUNK_SIZE/2}
+    set_chunk_tile(&chunk, tree_tile, center_pos)
+
+    return chunk
+}
+
+get_chunk :: proc(w:^World, chunk_pos:Vec2i) -> ^Chunk {
+    chunk, exists := w.chunks[chunk_pos]
+    if !exists {
+        w.chunks[chunk_pos] = load_chunk(chunk_pos, w)
+    }
+    return &w.chunks[chunk_pos]
+}
+
+get_chunk_from_world_pos :: proc(w:^World, pos:rl.Vector2) -> ^Chunk {
+    chunk_pos := world_pos_to_chunk_pos(pos)
+    return get_chunk(w, chunk_pos)
+}
+
+world_pos_to_chunk_pos :: proc(pos:rl.Vector2) -> Vec2i {
+    chunk_pos := vec2_to_vec2i({pos.x / CHUNK_SIZE, pos.y / CHUNK_SIZE})
+    return chunk_pos
+}
+
+get_local_chunk_pos :: proc(pos:Vec2i) -> Vec2i {
+    return Vec2i {
+        (pos.x % CHUNK_SIZE + CHUNK_SIZE) % CHUNK_SIZE,
+        (pos.y % CHUNK_SIZE + CHUNK_SIZE) % CHUNK_SIZE,
+    }
+}
+
+get_world_tile :: proc(w:^World, pos:Vec2i) -> ^Tile {
+    chunk_pos := world_pos_to_chunk_pos(vec2i_to_vec2(pos))
+    local_pos := get_local_chunk_pos(pos)
+    
+    chunk := get_chunk(w, chunk_pos)
+
+    return get_chunk_tile(chunk, local_pos)
+}
+
+get_chunk_tile :: proc(c:^Chunk, pos:Vec2i) -> ^Tile {
+    return &c.tiles[pos.x][pos.y]
+}
+
+set_chunk_tile :: proc(c:^Chunk, t:Tile, pos:Vec2i) {
+    c.tiles[pos.x][pos.y] = t
+}
+
+set_tile :: proc(w:^World, t:Tile, p:Vec2i) {
+    chunk := get_chunk_from_world_pos(w, vec2i_to_vec2(p))
+
+    set_chunk_tile(chunk, t, get_local_chunk_pos(p))
+
+    save_chunk(chunk, w)
+}   
+
 draw_world :: proc(w:^World) {
-    for x in 0..< len(w.grid) {
-        for y in 0..< len(w.grid) {
-            tile := w.grid[x][y]
-            posX := x * TILE_SIZE
-            posY := y * TILE_SIZE
+    for chunk_pos, chunk in w.chunks {
+        for x in 0..<CHUNK_SIZE {
+            for y in 0..<CHUNK_SIZE {
+                tile := chunk.tiles[x][y]
+                world_x := chunk_pos.x * CHUNK_SIZE + x
+                world_y := chunk_pos.y * CHUNK_SIZE + y
+                pos := rl.Vector2{f32(world_x * CELL_SIZE), f32(world_y * CELL_SIZE)}

-            if tile.type != .NOTHING {
-                draw_tile(tile.tilemap_pos, {f32(posX), f32(posY)}, tile.color)
+                if tile.type != .NOTHING {
+                    draw_tile(vec2i_to_vec2(tile.tilemap_pos), pos, rl.Color(tile.color))
+                }
            }
        }
    }