Added intro game state and placeholder assets.

src/intro.lua

@@ -5,6 +5,7 @@
 local love = require 'love'
 local make_class = require 'src.classes'
 local GameState = require 'src.gstate'
+local Fader = require 'src.fader'
 
 
 ------------------------------------------------------------------------------
@@ -19,37 +20,83 @@ local Intro = make_class(GameState)
 ------------------------------------------------------------------------------
 
 function Intro:_init(name, index)
-    -- Call super-class constructor.
     GameState._init(self, name, index)
-
-    -- Attribute definitions
     self.skip = false
+    self.fade = Fader()
+    self.stage = 0
+    self.timer = 0
 end
 
 
 function Intro:load()
-    self.background = love.graphics.newImage('imgs/cpu.png')
+    self.splash = love.graphics.newImage('imgs/splash.png')
+    self.author = love.graphics.newImage('imgs/wally.png')
+    self.title = love.graphics.newImage('imgs/title.png')
+    self.splash_snd = love.audio.newSource('snd/jachiev.wav')
+    self.author_snd = love.audio.newSource('snd/alang.wav')
+    self.title_snd = love.audio.newSource('snd/ablhole.wav')
     self.valid = true
+
+    self.splash_snd:play()
 end
 
 
-function Intro:update(_)
-    if not self.skip then return self.index else return 0 end
+function Intro:update(dt)
+    local total_time
+
+    if self.stage == 0 then
+        total_time = 4.5
+    elseif self.stage == 1 then
+        total_time = 3.0
+    else
+        total_time = 8.0
+    end
+
+    if self.fade.done then
+        self.timer = self.timer + dt
+    end
+
+    if self.timer >= total_time then
+        self.fade:fade_out(
+            function ()
+                self.stage = self.stage + 1
+
+                if self.stage == 1 then
+                    self.author_snd:play()
+                elseif self.stage == 2 then
+                    self.title_snd:play()
+                end
+
+                self.fade:fade_in()
+            end
+        )
+        self.timer = 0.0
+    end
+
+    self.fade:update(dt)
+
+    if not self.skip and self.stage < 3 then return self.index else return 2 end
 end
 
 
 function Intro:draw()
     if self.valid then
-        love.graphics.draw(self.background, 0, 0)
-        love.graphics.print(string.format('OS: %s', love.system.getOS()), 5, 5)
-        love.graphics.print(string.format('Love version: %s', love.getVersion()), 5, 15)
-        love.graphics.print(string.format('Memory usage: %s KiB', love.system.getMemUsage()), 5, 25)
+        if self.stage == 0 then love.graphics.draw(self.splash, 0, 0)
+        elseif self.stage == 1 then love.graphics.draw(self.author, 0, 0)
+        elseif self.stage == 2 then love.graphics.draw(self.title, 0, 0) end
     end
+
+    self.fade:draw()
 end
 
 
 function Intro:unload()
-    self.background = nil
+    self.splash = nil
+    self.author = nil
+    self.title = nil
+    self.splash_snd = nil
+    self.author_snd = nil
+    self.title_snd = nil
     self.valid = false
 end