Merge pull request #46 from tanema/optimizations

Adding optimizations done by other developers

lib/init.lua

@@ -40,6 +40,8 @@ local function new(options)
   local obj = {}
   obj.lights = {}
   obj.bodies = {}
+  obj.visibleLights = {}
+  obj.visibleBodies = {}
   obj.post_shader = PostShader()
 
   obj.l, obj.t, obj.s      =  0, 0, 1
@@ -83,14 +85,22 @@ function light_world:refreshScreenSize(w, h)
 end
 
 function light_world:update(dt)
+  self.visibleBodies = {}
+  self.visibleLights = {}
   for i = 1, #self.bodies do
-    self.bodies[i].is_on_screen = self.bodies[i]:inRange(-self.l,-self.t,self.w,self.h,self.s)
+    local body = self.bodies[i]
-    if self.bodies[i]:isVisible() then
+    body.is_on_screen = body:inRange(-self.l,-self.t,self.w,self.h,self.s)
-      self.bodies[i]:update(dt)
+    if body:isVisible() then
+      body:update(dt)
+      table.insert(self.visibleBodies, body)
     end
   end
   for i = 1, #self.lights do
-    self.lights[i].is_on_screen = self.lights[i]:inRange(self.l,self.t,self.w,self.h,self.s)
+    local light = self.lights[i]
+    light.is_on_screen = light:inRange(self.l,self.t,self.w,self.h,self.s)
+    if light.is_on_screen then
+      table.insert(self.visibleLights, light)
+    end
   end
 end
 
@@ -112,10 +122,8 @@ function light_world:drawShadows(l,t,w,h,s)
   love.graphics.clear()
   love.graphics.setCanvas()
   util.drawto(self.normalMap, l, t, s, false, function()
-    for i = 1, #self.bodies do
+    for i = 1, #self.visibleBodies do
-      if self.bodies[i]:isVisible() then
+      self.visibleBodies[i]:drawNormal()
-        self.bodies[i]:drawNormal()
-      end
     end
   end)
 
@@ -125,9 +133,8 @@ function light_world:drawShadows(l,t,w,h,s)
   love.graphics.setCanvas( self.shadow_buffer )
   love.graphics.clear()
   love.graphics.setCanvas()
-  for i = 1, #self.lights do
+  for i = 1, #self.visibleLights do
-    local light = self.lights[i]
+    local light = self.visibleLights[i]
-    if light:isVisible() then
     -- create shadow map for this light
     love.graphics.setCanvas( self.shadowMap )
     love.graphics.clear()
@@ -174,7 +181,6 @@ function light_world:drawShadows(l,t,w,h,s)
       end
     })
   end
-  end
 
   -- add in ambient color
   util.drawto(self.shadow_buffer, l, t, s, false, function()

lib/util.lua

@@ -1,11 +1,14 @@
 local util = {}
+local tempCanvas
 --TODO: the whole stencil/canvas system should be reviewed since it has been changed in a naive way
 
 function util.process(canvas, options)
   --TODO: now you cannot draw a canvas to itself
-  temp = love.graphics.newCanvas()
+  if not tempCanvas then
-  util.drawCanvasToCanvas(canvas, temp, options)
+    tempCanvas = love.graphics.newCanvas()
-  util.drawCanvasToCanvas(temp, canvas, options)
+  end
+  util.drawCanvasToCanvas(canvas, tempCanvas, options)
+  util.drawCanvasToCanvas(tempCanvas, canvas, options)
 end
 
 function util.drawCanvasToCanvas(canvas, other_canvas, options)