feat(battlemaps): add basic parallax capabilities

sonic-radiance.love/datas/gamedata/maps/battle/ebeach/init.lua

@@ -1,11 +1,15 @@
 return {
   name = "Emerald Beach",
   blocks    = {
-    {96,   48, 64, 32, "top1", "side2"},
-    {112,  80, 32, 32, "top3", "side1"},
+    {80,   64, 64, 32, "top1", "side2"},
+    {96,   96, 32, 32, "top3", "side1"},
     {192,  32, 96, 32, "top2", "side3"},
-    {240, 112, 32, 64, "top4", "side1"},
-    {112, 160, 32, 64, "top4", "side1"},
-    {208, 224, 64, 32, "top5", "side2"},
+    {224, 128, 32, 64, "top4", "side1"},
+    {96,  176, 32, 64, "top4", "side1"},
+    {192, 240, 64, 32, "top5", "side2"},
+  },
+  parallax  = {
+    {0,  0,  .5,  0, true, false, "back1"},
+    {0, 10,   1,   1, true, false, "back2"},
   }
 }

sonic-radiance.love/game/modules/world/maps/battle.lua

@@ -10,6 +10,8 @@ function BattleMap:new(world, maptype, mapname)
   self.background = love.graphics.newImage(self.directory .. "background.png")
   self.data       = require(self.mappath)
   self.assets     = world.scene.assets
+
+  self:addParallax()
 end
 
 function BattleMap:loadCollisions()
@@ -47,8 +49,49 @@ function BattleMap:draw()
   love.graphics.draw(self.background, 0, 0, 0, 1, 0.5)
 end
 
+function BattleMap:addParallax()
+  self.parallax = {}
+
+  for i,layerdata in ipairs(self.data.parallax) do
+    local layer = {}
+    layer.basex      = layerdata[1]
+    layer.basey      = layerdata[2]
+    layer.background = love.graphics.newImage(self.directory .. layerdata[7] .. ".png")
+    local w, h = layer.background:getDimensions()
+    layer.w = w
+    layer.h = h
+
+    if (layerdata[5]) then
+      layer.repeatx = math.ceil(424/w + 1)
+    else
+      layer.repeatx = 1
+    end
+
+    if (layerdata[6]) then
+      layer.repeaty = math.ceil(240/h + 1)
+    else
+      layer.repeaty = 1
+    end
+
+    layer.decalx = layerdata[3]
+    layer.decaly = layerdata[4]
+
+    table.insert(self.parallax, layer)
+  end
+end
+
 function BattleMap:drawParallax(x, y, w, h)
-  -- Empty Placeholder function
+  for i1, layer in ipairs(self.parallax) do
+    local x = math.floor((x)*layer.decalx) % layer.w
+
+    for i=1, layer.repeatx do
+      for j=1, layer.repeaty do
+        local xx = math.floor(layer.basex + (layer.w * (i-1)) - x)
+        local yy = math.floor(layer.basey + (layer.h * (j-1)) - (y+96)*layer.decaly)
+        love.graphics.draw(layer.background, xx, yy)
+      end
+    end
+  end
 end
 
 return BattleMap