2 files changed, 793 insertions, 0 deletions
diff --git a/src/tiled/json.odin b/src/tiled/json.odin
new file mode 100644
index 0000000..874430e
--- /dev/null
+++ b/src/tiled/json.odin
@@ -0,0 +1,208 @@
+package tiled
+
+Json_Map :: struct {
+  backgroundcolor: string,
+  class: string,
+  compressionlevel: i32,
+  width: i32,
+  height: i32,
+  infinite: bool,
+  layers: []Json_Layer,
+  nextlayerid: i32,
+  nextobjectid: i32,
+  orientation: string,
+  parallaxoriginx: f64,
+  parallaxoriginy: f64,
+  properties: []Json_Property,
+  renderorder: string,
+  staggeraxis: string,
+  staggerindex: string,
+  tilewidth: i32,
+  tileheight: i32,
+  tilesets: []Json_Tile_Set,
+}
+
+Json_Layer :: struct {
+  class: string,
+  compression: string,
+  data: union {
+    []i32,
+    string,
+  },
+  draworder: string,
+  encoding: string,
+  id: i32,
+  image: string,
+  image_width: i32,
+  image_height: i32,
+  layers: []Json_Layer,
+  // locked: bool,
+  name: string,
+  objects: []Json_Object,
+  offsetx: f64,
+  offsety: f64,
+  opacity: f32,
+  parallaxx: f64,
+  parallaxy: f64,
+  properties: []Json_Property,
+  repeatx: bool,
+  repeaty: bool,
+  tintcolor: string,
+  transparentcolor: string,
+  type: string,
+  visible: bool,
+  x: i32,
+  y: i32,
+  width: i32,
+  height: i32,
+}
+
+Json_Object :: struct {
+  ellipse: bool,
+  gid: i32,
+  width: f64,
+  height: f64,
+  id: i32,
+  name: string,
+  point: bool,
+  polygon: []Json_Point,
+  polyline: []Json_Point,
+  properties: []Json_Property,
+  rotation: f64,
+  template: string,
+  text: Maybe(struct {
+    fontfamily: string,
+    color: string,
+    text: string,
+    halign: string,
+    valign: string,
+    pixelsize: i32,
+    wrap: bool,
+    underline: bool,
+    bold: bool,
+    italic: bool,
+    kerning: bool,
+    strikeout: bool,
+  }),
+  type: string,
+  visible: bool,
+  x: f64,
+  y: f64,
+}
+
+Json_Tile_Set :: struct {
+  background_color: string,
+  class: string,
+  rows: i32,
+  columns: i32,
+  fillmode: string,
+  firstgid: i32,
+  grid: Maybe(Json_Grid),
+  image: string,
+  imagewidth: i32,
+  imageheight: i32,
+  margin: i32,
+  name: string,
+  objectalignment: string,
+  properties: []Json_Property,
+  source: string,
+  spacing: i32,
+  terrains: []Json_Terrain,
+  tilecount: i32,
+  tilewidth: i32,
+  tileheight: i32,
+  tileoffset: Json_Tile_Offset,
+  tilerendersize: string,
+  tiles: []Json_Tile,
+  transformations: Json_Transformations,
+  transparentcolor: string,
+  type: string,
+  wangsets: []Json_Wang_Set,
+}
+
+Json_Grid :: struct {
+  width: i32,
+  height: i32,
+  orientation: string,
+}
+
+Json_Tile_Offset :: struct {
+  x: i32,
+  y: i32,
+}
+
+Json_Transformations :: struct {
+  hflip: bool,
+  vflip: bool,
+  rotate: bool,
+  preferuntransformed: bool,
+}
+
+Json_Tile :: struct {
+  animation: []Json_Frame,
+  id: i32,
+  image: string,
+  imagewidth: i32,
+  imageheight: i32,
+  x: i32,
+  y: i32,
+  width: i32,
+  height: i32,
+  objectgroup: Json_Layer,
+  probability: f64,
+  properties: []Json_Property,
+  terrain: []i32,
+  type: string,
+}
+
+Json_Frame :: struct {
+  duration: i32, 
+  tileid: i32,
+}
+
+Json_Terrain :: struct {
+  name: string,
+  properties: []Json_Property,
+  tile: i32,
+}
+
+Json_Wang_Set :: struct {
+  class: string,
+  colors: []Json_Wang_Color,
+  name: string,
+  properties: []Json_Property,
+  tile: i32,
+  type: string,
+  wangtiles: []Json_Wang_Tile,
+}
+
+Json_Wang_Color :: struct {
+  class: string,
+  color: string,
+  name: string,
+  probability: f64,
+  properties: []Json_Property,
+  tile: i32,
+}
+
+Json_Wang_Tile :: struct {
+  tileid: i32,
+  wangid: []u8,
+}
+
+Json_Object_Template :: struct {
+  tileset: Maybe(Json_Tile_Set),
+  object: Json_Object,
+}
+
+Json_Property :: struct {
+  name: string,
+  type: string,
+  propertytype: string,
+  value: any,
+}
+
+Json_Point :: struct {
+  x: f64,
+  y: f64,
+}
diff --git a/src/tiled/tiled.odin b/src/tiled/tiled.odin
new file mode 100644
index 0000000..e1627a5
--- /dev/null
+++ b/src/tiled/tiled.odin
@@ -0,0 +1,585 @@
+package tiled
+
+import os "core:os/os2"
+import mem "core:mem"
+import strings "core:strings"
+import "core:path/filepath"
+import "core:log"
+import "core:encoding/json"
+
+import rl "vendor:raylib"
+
+Color :: [4]f32
+
+Error :: enum {
+  NONE = 0,
+  COULD_NOT_LOAD,
+  NON_ORTHOGONAL_NOT_SUPPORTED,
+  INFINITE_NOT_SUPPORTED,
+  ELLIPSE_OBJ_NOT_SUPPORTED,
+  POLYGON_OBJ_NOT_SUPPORTED,
+  POLYLINE_OBJ_NOT_SUPPORTED,
+  TEXT_OBJ_NOT_SUPPORTED,
+}
+
+Axis :: enum {
+  X,
+  Y,
+}
+
+Properties :: map[string]any
+
+Map :: struct {
+  // Currently, only orthogonal maps are allowed. Any non-orthogonal maps
+  // throw an error.
+  // Infinite maps will also throw an error for now.
+
+  background_color: Color,
+  class: string,
+
+  width: i32,
+  height: i32,
+
+  layers: []Layer,
+
+  next_layer_id: i32,
+  next_object_id: i32,
+
+  parallax_origin_x: f64,
+  parallax_origin_y: f64,
+
+  properties: Properties,
+
+  // stagger_axis: Axis,
+  // stagger_offset: i32, // To replace stagger index.
+
+  tile_width: i32,
+  tile_height: i32,
+
+  tile_sets: []Tile_Set,
+
+  tiles: [dynamic]Tile,
+}
+
+Layer :: struct {
+  // Layers that aren't visible are entirely ignored.
+  name: string,
+  properties: Properties,
+
+  parallax_x: f64,
+  parallax_y: f64,
+
+  tint: Color,
+  id: i32,
+
+  layer: union #no_nil {
+    Tile_Layer,
+    Image_Layer,
+    Object_Layer,
+  }
+}
+
+Tile_Layer :: struct {
+  // Data will automatically become uncompressed.
+  width: i32,
+  height: i32,
+  data: []i32,
+}
+
+Image_Layer :: struct {
+  texture: rl.Texture2D,
+  transparent_color: Color,
+  repeat_x: bool,
+  repeat_y: bool,
+}
+
+Object_Layer :: []Object
+
+Object_Type :: enum {
+  POINT,
+  TILE,
+  RECT,
+}
+
+Object :: struct {
+  // For now, anything that *isn't* one of these is ignored and 
+  // a warning is thrown:
+  // - Point
+  // - Tile
+  // - Rectangle
+  // 
+  // Objects that aren't visible will be ignored entirely.
+
+  type: Object_Type,
+  name: string,
+  class: string,
+  properties: Properties,
+  position: [2]f32,
+  size: [2]f32,
+  tile_id: i32,
+}
+
+Tile_Set :: struct {
+  // For now, any autotiling information is ignored.
+
+  properties: Properties,
+  
+  rows: i32,
+  columns: i32,
+
+  first_gid: i32,
+
+  texture: rl.Texture2D,
+  margin: i32,
+  spacing: i32,
+
+  tile_count: i32,
+  tile_width: i32,
+  tile_height: i32,
+  tile_offset: [2]i32, // in pixels
+
+  tiles: []Tile,
+}
+
+Tile :: struct {
+  // For now, animations are ignored. Support in the future is somewhat likely.
+  // And similar to above, autotiling information is ignored.
+
+  is_image_collection: bool,
+
+  tile_set: i32, // index for the tile set in Map
+
+  id: i32,
+  gid: i32,
+
+  texture: Maybe(rl.Texture2D), // If the tile is part of an image collection.
+
+  // Where on the texture is this tile
+  src_start: [2]i32,
+  src_size: [2]i32,
+
+  object_group: Layer, // Object layer for collisions.
+
+  properties: Properties,
+}
+
+load_map :: proc(path: string) -> (Map, Error) {
+  defer free_all(context.temp_allocator)
+
+  jmap_text, read_err := os.read_entire_file(path, context.temp_allocator)
+  if read_err != nil {
+    log.errorf("Failed to read file %v (%v)", path, read_err)
+    return {}, .COULD_NOT_LOAD
+  }
+
+  jmap: Json_Map
+  unmarshal_err := json.unmarshal(
+    jmap_text,
+    &jmap,
+    allocator = context.temp_allocator,
+  )
+  if unmarshal_err != nil {
+    log.errorf("Failed to unmarshal file %v (%v)", path, unmarshal_err)
+    return {}, .COULD_NOT_LOAD
+  }
+
+  log.info(jmap)
+
+  tmap: Map
+  err := convert_json_map(jmap, &tmap, path)
+  if err != .NONE {
+    return {}, err
+  }
+  return tmap, .NONE
+}
+
+delete_map :: proc(tmap: Map) {
+  delete(tmap.class)
+  delete(tmap.properties)
+
+  for layer in tmap.layers {
+    delete_layer(layer)
+  }
+  delete(tmap.layers)
+
+  for tile_set in tmap.tile_sets {
+    delete(tile_set.properties)
+    delete(tile_set.tiles) // all tiles are deleted later
+    rl.UnloadTexture(tile_set.texture)
+  }
+  delete(tmap.tile_sets)
+
+  for tile in tmap.tiles {
+    delete(tile.properties)
+
+    if tile.texture != nil {
+      rl.UnloadTexture(tile.texture.(rl.Texture2D))
+    }
+
+    delete_layer(tile.object_group)
+  }
+  delete(tmap.tiles)
+}
+
+@(private)
+delete_layer :: proc(layer: Layer) {
+  delete(layer.name)
+  delete(layer.properties)
+
+  switch l in layer.layer {
+  case Tile_Layer:
+    delete(l.data)
+  case Image_Layer:
+    rl.UnloadTexture(l.texture)
+  case Object_Layer:
+    for obj in l {
+      delete(obj.name)
+      delete(obj.class)
+      delete(obj.properties)
+    }
+    delete(l)
+  }
+}
+
+@(private)
+convert_json_color :: proc(jcolor: string) -> Color {
+  return Color{1, 1, 1, 1}
+}
+
+@(private)
+convert_json_properties :: proc(jprops: []Json_Property) -> Properties {
+  props := make(Properties)
+
+  for jprop in jprops {
+    props[jprop.name] = jprop.value
+  }
+
+  return props
+}
+
+@(private)
+convert_json_map :: proc(jmap: Json_Map, tmap: ^Map, path: string) -> Error {
+  // ensure the map is orthogonal
+  if strings.compare(jmap.orientation, "orthogonal") != 0 {
+    return .NON_ORTHOGONAL_NOT_SUPPORTED
+  }
+
+  // ensure the map is not infinite
+  if jmap.infinite {
+    return .INFINITE_NOT_SUPPORTED
+  }
+
+  tmap.background_color = convert_json_color(jmap.backgroundcolor)
+  tmap.class = strings.clone(jmap.class)
+
+  tmap.width = jmap.width
+  tmap.height = jmap.height
+
+  tmap.tile_width = jmap.tilewidth
+  tmap.tile_height = jmap.tileheight
+
+  tmap.next_layer_id = jmap.nextlayerid
+  tmap.next_object_id = jmap.nextobjectid
+
+  tmap.parallax_origin_x = jmap.parallaxoriginx
+  tmap.parallax_origin_y = jmap.parallaxoriginy
+
+  tmap.properties = convert_json_properties(jmap.properties)
+
+  // TODO: flatten groups
+  layer_count := len(jmap.layers)
+  for jlayer in jmap.layers {
+    layer_count += len(jlayer.layers) // take into consideration groups
+  }
+
+  tmap.layers = make([]Layer, layer_count)
+  current_index := 0
+
+  for jlayer in jmap.layers {
+    if !jlayer.visible {
+      continue // ignore hidden layers
+    }
+
+    // FIXME: Some duplicated code down here
+    if strings.compare(jlayer.type, "group") == 0 {
+      for jlayer2 in jlayer.layers {
+        if !jlayer2.visible {
+          continue // ignore hidden layers
+        }
+
+        layer, err := convert_json_layer(jlayer2)
+        if err != .NONE {
+          return err
+        }
+        tmap.layers[current_index] = layer
+        current_index += 1
+      }
+      continue
+    }
+
+    layer, err := convert_json_layer(jlayer)
+    if err != .NONE {
+      return err
+    }
+    tmap.layers[current_index] = layer
+    current_index += 1
+  }
+
+  tmap.tile_sets = make([]Tile_Set, len(jmap.tilesets))
+
+  res_dir := filepath.dir(path, allocator = context.temp_allocator)
+
+  for jtile_set, i in jmap.tilesets {
+    tile_set, err := convert_json_tile_set(tmap, res_dir, jtile_set)
+    if err != .NONE {
+      return err
+    }
+    tmap.tile_sets[i] = tile_set
+
+    for j in int(tile_set.first_gid)..<len(tmap.tiles) {
+      tile_set.tiles[j].tile_set = i32(i)
+    }
+  }
+
+  return .NONE
+}
+
+draw_map :: proc(tmap: Map) {
+  for layer in tmap.layers {
+    tile_layer, ok := layer.layer.(Tile_Layer)
+    if !ok {
+      continue
+    }
+
+    x: i32 = 0
+    y: i32 = 0
+
+    for cell in tile_layer.data {
+      if cell != 0 {
+        tile := tmap.tiles[cell - 1]
+        tile_set := tmap.tile_sets[tile.tile_set]
+
+        rl.DrawTexturePro(
+          tile_set.texture,
+          rl.Rectangle{
+            x = f32(tile.src_start.x),
+            y = f32(tile.src_start.y),
+            width = f32(tile.src_size.x),
+            height = f32(tile.src_size.y),
+          },
+          rl.Rectangle{
+            x = f32(x),
+            y = f32(y),
+            width = f32(tile.src_size.x),
+            height = f32(tile.src_size.y),
+          },
+          {0, 0},
+          0,
+          rl.WHITE,
+        )
+      }
+
+      x += tmap.tile_width
+      if x > (tmap.width - 1) * tmap.tile_width {
+        x = 0
+        y += tmap.tile_height
+      }
+    }
+  }
+}
+
+@(private)
+load_image :: proc(filename: string, res_dir: string) -> rl.Texture2D {
+  path := strings.concatenate({res_dir, "/", filename})
+  defer delete(path)
+
+  byte_path := make([]u8, len(path) + 1, context.temp_allocator)
+  copy(byte_path, path)
+  byte_path[len(path)] = 0
+  return rl.LoadTexture(transmute(cstring)&byte_path[0])
+}
+
+@(private)
+convert_json_layer :: proc(jlayer: Json_Layer) -> (Layer, Error) {
+  // TODO: uncompress tile data
+
+  layer: Layer
+
+  layer.name = strings.clone(jlayer.name)
+
+  layer.parallax_x = jlayer.parallaxx
+  layer.parallax_y = jlayer.parallaxy
+
+  layer.id = jlayer.id
+
+  layer.tint = convert_json_color(jlayer.tintcolor)
+
+  layer.properties = convert_json_properties(jlayer.properties)
+
+  switch jlayer.type {
+  case "tilelayer":
+    tile_layer := Tile_Layer{
+      width = jlayer.width,
+      height = jlayer.height,
+    }
+
+    data := jlayer.data.([]i32)
+    tile_layer.data = make([]i32, len(data))
+    copy(tile_layer.data, data)
+
+    layer.layer = tile_layer
+
+  case "objectgroup":
+    obj_layer := make(Object_Layer, len(jlayer.objects))
+
+    for jobj, i in jlayer.objects {
+      if !jobj.visible {
+        continue // ignore hidden objects
+      }
+
+      obj, err := convert_json_object(jobj)
+      if err != .NONE {
+        return {}, err
+      }
+      obj_layer[i] = obj
+    }
+
+    layer.layer = obj_layer
+
+  case "imagelayer":
+    image_layer := Image_Layer{
+      texture = load_image(jlayer.image, "res"),
+      transparent_color = convert_json_color(jlayer.transparentcolor),
+      repeat_x = jlayer.repeatx,
+      repeat_y = jlayer.repeaty,
+    }
+
+    layer.layer = image_layer
+
+  case "group":
+    // groups are handled elsewhere
+  }
+
+  return layer, .NONE
+}
+
+@(private)
+convert_json_object :: proc(jobj: Json_Object) -> (Object, Error) {
+  obj: Object
+
+  if jobj.ellipse {
+    return {}, .ELLIPSE_OBJ_NOT_SUPPORTED
+  }
+  if jobj.polygon != nil {
+    return {}, .POLYGON_OBJ_NOT_SUPPORTED
+  }
+  if jobj.polyline != nil {
+    return {}, .POLYLINE_OBJ_NOT_SUPPORTED
+  }
+  if jobj.text != nil {
+    return {}, .TEXT_OBJ_NOT_SUPPORTED
+  }
+
+  obj.position = {
+    f32(jobj.x),
+    f32(jobj.y),
+  }
+  obj.size = {
+    f32(jobj.width),
+    f32(jobj.height),
+  }
+  obj.tile_id = jobj.gid
+
+  obj.name = strings.clone(jobj.name)
+  obj.class = strings.clone(jobj.type)
+  obj.properties = convert_json_properties(jobj.properties)
+
+  return obj, .NONE
+}
+
+@(private)
+convert_json_tile_set :: proc(
+  tmap: ^Map,
+  res_dir: string,
+  jtile_set: Json_Tile_Set,
+) -> (Tile_Set, Error) {
+  if len(jtile_set.source) > 0 {
+    // Tileset links somewhere else
+    path := strings.concatenate({res_dir, "/", jtile_set.source})
+    defer delete(path)
+
+    data, err := os.read_entire_file(path, allocator = context.temp_allocator)
+    if err != nil {
+      log.errorf("Could not load external tile set '%v'", path)
+      return {}, .COULD_NOT_LOAD
+    }
+    
+    new_jtile_set: Json_Tile_Set
+    marshal_err := json.unmarshal(
+      data,
+      &new_jtile_set,
+      allocator = context.temp_allocator,
+    )
+    if marshal_err != nil {
+      log.errorf("Could not unmarshal external tile set '%v'", path)
+      return {}, .COULD_NOT_LOAD
+    }
+
+    return convert_json_tile_set(tmap, res_dir, new_jtile_set)
+  }
+
+  tile_set: Tile_Set
+
+  tile_set.rows = jtile_set.rows
+  tile_set.columns = jtile_set.columns
+
+  tile_set.first_gid = jtile_set.firstgid
+
+  tile_set.texture = load_image(jtile_set.image, res_dir)
+  tile_set.margin = jtile_set.margin
+  tile_set.spacing = jtile_set.spacing
+
+  tile_set.tile_count = jtile_set.tilecount
+  tile_set.tile_width = jtile_set.tilewidth
+  tile_set.tile_height = jtile_set.tileheight
+  tile_set.tile_offset = {
+    jtile_set.tileoffset.x,
+    jtile_set.tileoffset.y,
+  }
+
+  tile_set.properties = convert_json_properties(jtile_set.properties)
+
+  tile_set.tiles = make([]Tile, jtile_set.tilecount)
+
+  // Ignore margin and spacing for now
+  // TODO: account for margin and spacing
+  tile_x := tile_set.texture.width / tile_set.tile_width
+  tile_y := tile_set.texture.height / tile_set.tile_height
+
+  current_index := 0
+  for y in 0..<tile_y {
+    for x in 0..<tile_x {
+      tile := &tile_set.tiles[current_index]
+
+      tile.id = i32(current_index)  
+
+      tile.src_start = {
+        x * tile_set.tile_width,
+        y * tile_set.tile_height,
+      }
+      tile.src_size = {
+        tile_set.tile_width,
+        tile_set.tile_height,
+      }
+
+      tile.gid = i32(len(tmap.tiles))
+      append(&tmap.tiles, tile^)
+
+      current_index += 1
+    }
+  }
+
+  // TODO: here, go through jtile_set.tiles and load in more tile data
+
+  return tile_set, .NONE
+}