implemented asset loading and animations

animation.lua

@@ -0,0 +1,30 @@
+local __Animation = {
+    spriteSheet = nil,
+    quads = nil,
+    fps = 12,
+    currentTime = 0
+}
+
+function Animation(image, width, height)
+    local animation = {}
+    animation.spriteSheet = image;
+    animation.quads = {};
+
+    for y = 0, image:getHeight() - height, height do
+        for x = 0, image:getWidth() - width, width do
+            table.insert(animation.quads, love.graphics.newQuad(x, y, width, height, image:getDimensions()))
+        end
+    end
+
+    return setmetatable(animation, { __index = __Animation })
+end
+
+function __Animation:getFrame()
+    local frametime = 1 / self.fps
+    local frame = math.floor(self.currentTime / frametime)
+    return self.quads[frame + 1]
+end
+
+function __Animation:update(dt)
+    self.currentTime = (self.currentTime + dt) % (#self.quads / self.fps)
+end

asset_bundle.lua

@@ -0,0 +1,47 @@
+require "option.option"
+
+AssetBundle = {
+    root = "/assets",
+    files = {}
+}
+
+function AssetBundle:load()
+    local function enumerate(path)
+        local tree = {}
+
+        local contents = love.filesystem.getDirectoryItems(path)
+        for _, v in pairs(contents) do
+            local newPath = path .. "/" .. v
+            local type = love.filesystem.getInfo(newPath).type
+            if type == "file" then
+                local data = self.loadFile(newPath)
+                if data:is_some() then
+                    tree[self.cutExtension(v)] = data:unwrap()
+                end
+            end
+            if type == "directory" then
+                tree[v] = enumerate(newPath)
+            end
+        end
+
+        return tree
+    end
+
+    self.files = enumerate(self.root)
+end
+
+function AssetBundle.loadFile(path)
+    local filedata = love.filesystem.newFileData(path)
+    local ext = filedata:getExtension()
+    if (ext == "png") then
+        local img = love.graphics.newImage(path)
+        img:setFilter("nearest", "nearest")
+        return
+            Some(img)
+    end
+    return None
+end
+
+function AssetBundle.cutExtension(filename)
+    return string.match(filename, '(.+)%.(.+)')
+end

entity.lua

@@ -0,0 +1,13 @@
+local __Entity = {
+    sprite = {},
+    position = Vec3 {},
+    velocity = Vec3 {}
+}
+
+function __Entity:update()
+
+end
+
+local __Sprite = {
+
+}

main.lua

@@ -31,8 +31,6 @@ end
 function Player:init()
     self.position = vec2(0, 0)
     self.velocity = vec2(0, 0)
-
-    self.sprite = love.graphics.newImage("player.png")
 end
 
 function Player:update(dt)
@@ -63,16 +61,30 @@ function Player:update(dt)
     -- print(vec2_length(self.velocity))
 end
 
+require "animation"
+require "asset_bundle"
+
+AssetBundle:load()
+
+
 function love.load()
     Player:init()
+    local sheet_r = AssetBundle.files.sprites.deer.walk_e
+    local sheet_l = AssetBundle.files.sprites.deer.walk_w
+
+    animation_r = Animation(sheet_r, 64, 64)
+    animation_l = Animation(sheet_l, 64, 64)
 end
 
 function love.update(dt)
     Player:update(dt)
+    animation_r:update(dt)
+    animation_l:update(dt)
 end
 
 function love.draw()
-    love.graphics.draw(Player.sprite, Player.position().x, Player.position().y)
+    local animation = Player.velocity().x > 0 and animation_r or animation_l
+    love.graphics.draw(animation.spriteSheet, animation:getFrame(), Player.position().x, Player.position().y, 0, 4, 4)
 end
 
 function love.conf(t)