feat(screen): add screen transitions

gamecore/init.lua

@@ -49,14 +49,14 @@ require(cwd .. "callbacks")
 -- Initialize and configure the core object
 
 function CoreSystem:new(DEBUGMODE)
+  self.modules  = modules
+
   self.debug    = DebugSystem(self, DEBUGMODE)
   self.options  = Options(self)
   self.input    = Input(self)
   self.screen   = Screen(self)
   self.scenemanager = SceneManager(self)
   self.lang         = Lang(self)
-
-  self.modules  = modules
 end
 
 function CoreSystem:registerGameSystem(gamesystem)
@@ -94,6 +94,7 @@ end
 function CoreSystem:update(dt)
   self.debug:update(dt)
   self.input:update(dt)
+  self.screen:update(dt)
 
   if (self.game ~= nil) then
     self.game:update(dt)
@@ -107,6 +108,7 @@ end
 
 function CoreSystem:draw()
   self.scenemanager:draw()
+  self.screen:drawFade()
 end
 
 -- EXIT FUNCTIONS

gamecore/screen.lua

@@ -39,6 +39,10 @@ function ScreenManager:new(controller)
   CScreen.setColor(0, 0, 0, 1)
 
   love.graphics.setDefaultFilter( "nearest", "nearest", 1 )
+
+  self.timers = self.controller.modules.Timers(self)
+
+  self.transitionValue = 0
 end
 
 function ScreenManager:applySettings()
@@ -93,6 +97,34 @@ function ScreenManager:resetScissor()
   love.graphics.setScissor( )
 end
 
+-- UPDATE FUNCTIONS
+-- Update the screen
+
+function ScreenManager:update(dt)
+  self.timers:update(dt)
+end
+
+-- TRANSITION FUNCTIONS
+-- Handle transitions
+
+function ScreenManager:fadeIn(duration, easing)
+  local duration  = duration or 1
+  local easing    = easing or "inExpo"
+  self.timers:newTween(0, duration, {transitionValue = 1}, easing)
+end
+
+function ScreenManager:fadeOut(duration, easing)
+  local duration  = duration or 1
+  local easing    = easing or "outExpo"
+  self.timers:newTween(0, duration, {transitionValue = 0}, easing)
+end
+
+function ScreenManager:drawFade()
+  local w, h = self:getDimensions()
+  love.graphics.setColor(0, 0, 0, self.transitionValue)
+  love.graphics.rectangle("fill", 0, 0, w, h)
+  utils.graphics.resetColor()
+end
 
 -- DRAW FUNCTIONS
 -- Apply draw functions to the scene