Stubbed Map, implemented optimized Map tile rendering, made Camera viewport explicitly defined

i-mic-rts.rb

@@ -22,6 +22,7 @@ require_relative "lib/states/menus/multiplayer_lobby_menu"
 require_relative "lib/zorder"
 require_relative "lib/entity"
 # require_relative "lib/entities/"
+require_relative "lib/map"
 
 require_relative "lib/order"
 require_relative "lib/friendly_hash"

lib/camera.rb

@@ -1,7 +1,8 @@
 class IMICRTS
   class Camera
-    attr_reader :position, :velocity, :zoom, :drag
-    def initialize(scroll_speed: 10, position: CyberarmEngine::Vector.new(0.0, 0.0))
+    attr_reader :viewport, :position, :velocity, :zoom, :drag
+    def initialize(viewport:, scroll_speed: 10, position: CyberarmEngine::Vector.new(0.0, 0.0))
+      @viewport = CyberarmEngine::BoundingBox.new(viewport[0], viewport[1], viewport[2], viewport[3])
       @scroll_speed = scroll_speed
       @position = position
       @velocity = CyberarmEngine::Vector.new(0.0, 0.0)
@@ -16,12 +17,14 @@ class IMICRTS
 
     def window; $window; end
 
-    def draw(*args, &block)
+    def draw(&block)
       if block
-        center_point = center
-        Gosu.translate(@position.x, @position.y) do
-          Gosu.scale(@zoom, @zoom, center.x, center.y) do
-            block.call
+        Gosu.clip_to(@viewport.min.x, @viewport.min.y, @viewport.max.x, @viewport.max.y) do
+          center_point = center
+          Gosu.translate(@position.x, @position.y) do
+            Gosu.scale(@zoom, @zoom, center.x, center.y) do
+              block.call
+            end
           end
         end
       end
@@ -34,6 +37,9 @@ class IMICRTS
       @velocity *= @drag
 
       @position += @velocity * @scroll_speed
+
+      @viewport.max.x = window.width
+      @viewport.max.y = window.height
     end
 
     def mouse_pick(x, y)
@@ -55,6 +61,18 @@ class IMICRTS
       @position += center.lerp(vector, factor) * window.dt
     end
 
+    def visible?(object)
+      if object.is_a?(Map::Tile)
+        object.position.x - object.size >= @viewport.min.x - @position.x &&
+        object.position.y - object.size >= @viewport.min.y - @position.y &&
+        object.position.x <= @viewport.max.x - @position.x &&
+        object.position.y <= @viewport.max.y - @position.y
+      else
+        pp object.class
+        exit
+      end
+    end
+
     def aspect_ratio
       window.height / window.width.to_f
     end

lib/director.rb

@@ -1,6 +1,6 @@
 class IMICRTS
   class Director
-    attr_reader :current_tick
+    attr_reader :current_tick, :map
     def initialize(map:, players:, networking_mode: :virtual, tick_rate: 10)
       @map = map
       @players = players

lib/map.rb

@@ -0,0 +1,62 @@
+class IMICRTS
+  class Map
+    Tile = Struct.new(:position, :color, :size)
+
+    def initialize(width:, height:, tile_size: 32)
+      @width, @height = width, height
+      @tile_size = tile_size
+
+      @tiles = []
+
+      height.times do |y|
+        width.times do |x|
+          @tiles.push(
+            Tile.new(
+              CyberarmEngine::Vector.new(x * @tile_size, y * @tile_size, ZOrder::TILE),
+              Gosu::Color.rgb(rand(25), rand(150..200), rand(25)),
+              @tile_size
+            )
+          )
+        end
+      end
+    end
+
+    def draw(camera)
+      visible_tiles(camera).each do |tile|
+        Gosu.draw_rect(
+          tile.position.x, tile.position.y,
+          @tile_size, @tile_size,
+          tile.color, tile.position.z
+        )
+      end
+    end
+
+    def visible_tiles(camera)
+      _tiles = []
+
+      top_left = camera.center - CyberarmEngine::Vector.new($window.width / 2, $window.height / 2) / camera.zoom
+      top_left.x = top_left.x.ceil
+      top_left.y = top_left.y.ceil
+
+      top_left /= @tiles.first.size
+
+      # +1 to overdraw a bit to hide pop-in
+      _width  = ($window.width / @tile_size) + 1
+      _height = ($window.height / @tile_size) + 1
+
+      _height.times do |y|
+        _width.times do |x|
+          if tile = tile_at(x + top_left.x, y + top_left.y)
+            _tiles.push(tile)
+          end
+        end
+      end
+
+      return _tiles
+    end
+
+    def tile_at(x, y)
+      @tiles[x + y * @width]
+    end
+  end
+end

lib/player.rb

@@ -8,7 +8,7 @@ class IMICRTS
 
       @entities = []
       @orders = []
-      @camera = Camera.new
+      @camera = Camera.new(viewport: [0, 0, $window.width, $window.height])
 
       @selected_entities = []
       @current_entity_id = 0

lib/states/game.rb

@@ -4,11 +4,11 @@ class IMICRTS
       window.show_cursor = true
 
       @player = Player.new(id: 0)
-      @director = Director.new(map: nil, players: [@player])
+      @director = Director.new(map: Map.new(width: 256, height: 256), players: [@player])
 
       @selected_entities = []
 
-      @debug_info = CyberarmEngine::Text.new("X: 0\nY: 0", x: 500, y: 10, z: Float::INFINITY)
+      @debug_info = CyberarmEngine::Text.new("", y: 10, z: Float::INFINITY)
 
       @sidebar = stack(height: 1.0) do
         background [0x55555555, 0x55666666]
@@ -55,7 +55,8 @@ class IMICRTS
 
       Gosu.draw_rect(0, 0, window.width, window.height, Gosu::Color.rgb(10, 175, 35))
 
-      @player.camera.draw(0, 0, window.width, window.height) do
+      @player.camera.draw do
+        @director.map.draw(@player.camera)
         @director.entities.each(&:draw)
         @selected_entities.each(&:selected_draw)
 
@@ -85,6 +86,7 @@ class IMICRTS
 
       mouse = @player.camera.mouse_pick(window.mouse_x, window.mouse_y)
       @debug_info.text = %(
+        FPS: #{Gosu.fps}
         Aspect Ratio: #{@player.camera.aspect_ratio}
         Zoom: #{@player.camera.zoom}
         Window Mouse X: #{window.mouse_x}