improvement(boxes): only use one texture for boxes instead of two

gamecore/modules/world/actors/utils/boxes/parent.lua

@@ -37,10 +37,8 @@ function Box3D:new(owner, w, h, d)
   self.shadowSources = {}
   self.needRedraw = false
 
-  self.texture = {}
-  self:setTopTexture()
-  self:setBottomTexture()
-  self.texture.shadows = love.graphics.newCanvas(self.w, self.h)
+  self:setTexture()
+  self.shadows = love.graphics.newCanvas(self.w, self.h)
 
   self:register()
 end
@@ -62,29 +60,33 @@ function Box3D:setSize()
   self:regenerate()
 end
 
-function Box3D:setTopTexture()
-  local canvas = love.graphics.newCanvas(self.w, self.h)
+function Box3D:setTexture()
+  local canvas = love.graphics.newCanvas(self.w, self.h + self.d)
   love.graphics.setCanvas( canvas )
   utils.graphics.resetColor()
-  love.graphics.rectangle("fill", 0, 0, self.w, self.h)
+
+  self:drawTextureContent()
+
   love.graphics.setCanvas( )
   local imagedata = canvas:newImageData()
-  self.texture.top = love.graphics.newImage( imagedata )
+  self.texture = love.graphics.newImage( imagedata )
   imagedata:release()
   canvas:release()
 end
 
-function Box3D:setBottomTexture()
-  local canvas = love.graphics.newCanvas(self.w, self.d)
-  love.graphics.setCanvas( canvas )
-  love.graphics.setColor(0.9, 0.9, 0.9, 1)
-  love.graphics.rectangle("fill", 0, 0, self.w, self.d)
+function Box3D:drawTextureContent()
+  self:drawTopTexture()
+  self:drawBottomTexture()
+end
+
+function Box3D:drawTopTexture()
   utils.graphics.resetColor()
-  love.graphics.setCanvas( )
-  local imagedata = canvas:newImageData()
-  self.texture.bottom = love.graphics.newImage( imagedata )
-  imagedata:release()
-  canvas:release()
+  love.graphics.rectangle("fill", 0, 0, self.w, self.h)
+end
+
+function Box3D:drawBottomTexture()
+  love.graphics.setColor(0.9, 0.9, 0.9, 1)
+  love.graphics.rectangle("fill", 0, self.h, self.w, self.d)
 end
 
 function Box3D:setShadowSource(actor, x, y)
@@ -123,7 +125,7 @@ end
 
 function Box3D:redrawShadowCanvas()
   if (self.needRedraw) then
-    love.graphics.setCanvas( self.texture.shadows )
+    love.graphics.setCanvas( self.shadows )
     love.graphics.clear()
     for i,v in ipairs(self.shadowSources) do
       v.actor:drawShadow(v.x, v.y)
@@ -141,10 +143,9 @@ function Box3D:draw(x, y, z)
     love.graphics.rectangle("line", x, (y-z) - (self.d), self.w, self.d + self.h)
   end
   utils.graphics.resetColor()
-  love.graphics.draw(self.texture.top, x, (y-z) - (self.d))
-  love.graphics.draw(self.texture.bottom, x, (y-z) - (self.d) + (self.h))
-  if (self.texture.shadows ~= nil) and (#self.shadowSources > 0) then
-    love.graphics.draw(self.texture.shadows, x, (y-z) - (self.d))
+  love.graphics.draw(self.texture, x, (y-z) - (self.d))
+  if (self.shadows ~= nil) and (#self.shadowSources > 0) then
+    love.graphics.draw(self.shadows, x, (y-z) - (self.d))
   end
 end