Updates, various.

- Naka has been split to a separate file for better readability.
  - Naka::Noise2D added. Basically Perlin noise, but it adds a few APIs
    to sum stacks of octaves and such. Generation from seed is still
    missing even though it’s critical.
  - An example map is generated using several Naka::Noise2D.
  - Some assets added, and used to display an example map. Objects that
    are higher than one tile are displayed, but widths can’t overflow
    at the moment.
  - Maps are saved to disk. This is still minimal, however, and loading
    them from save files is not implemented at the moment.
  - Some Naka::Event were added at some point, although they’re still
    very much works in progress, and probably incomplete.
  - Maps are displayed in a very crude way. Transitions between terrain
    types are unsupported, for example.

src/main.cr

@@ -1,167 +1,211 @@
 
-require "sdl"
-require "sdl/image"
+require "json"
 
-## Helper code comes here
+require "./naka.cr"
 
-class Naka
-	def self.init
-		SDL.init SDL::Init::VIDEO
-		SDL::IMG.init SDL::IMG::Init::PNG
+class Map
+	@save_directory : String
+	getter altitude_maps : Naka::Noise2D
+	getter humidity_maps : Naka::Noise2D
+	getter evil_maps :     Naka::Noise2D
+	getter flowers_map :   Naka::Noise2D
+	def initialize(@save_directory)
+		Dir.mkdir_p @save_directory
 
-		at_exit { SDL.quit }
-	end
+		@altitude_maps = Naka::Noise2D.new.tap do |a|
+			a.add_octave(32, 1)
+			a.add_octave(16, 0.5)
+			a.add_octave(8, 0.25)
+			a.add_octave(4, 0.125)
+			a.add_octave(2, 1/16) # wtf, too smol
 		end
 
-class Naka::Renderer < SDL::Renderer
+		@humidity_maps = Naka::Noise2D.new.tap do |a|
+			a.add_octave(64, 1)
+			a.add_octave(32, 0.5)
+			a.add_octave(16, 0.25)
+			a.add_octave(8, 0.20)
+			a.add_octave(4, 0.15)
+			a.add_octave(2, 0.10)
 		end
 
-class Naka::Window
-	alias Flags = LibSDL::WindowFlags
-	alias Position = LibSDL::WindowPosition
-
-	getter renderer
-
-	def initialize(title, width, height,
-				   x : Position = Position::UNDEFINED,
-				   y : Position = Position::UNDEFINED,
-				   flags : Flags = Flags::SHOWN)
-
-		@window = SDL::Window.new(title, width, height, x, y, flags)
-		@renderer = Naka::Renderer.new @window
+		@evil_maps = Naka::Noise2D.new.tap do |a|
+			a.add_octave(48, 0.6)
+			a.add_octave(32, 0.6)
+			a.add_octave(16, 0.3)
 		end
 
-	def newImage(file_path) : SDL::Texture
-		SDL::IMG.load file_path, @renderer
+		@flowers_map = Naka::Noise2D.new(1, 1)
 	end
 
-	# FIXME: We’ll probably want options for scaling, rotations, and so on.
-	def draw(texture : SDL::Texture, x : Int32, y : Int32)
-		@renderer.copy texture,
-			dstrect: SDL::Rect[x, y, texture.width, texture.height]
-	end
+	class Object
+		getter type : String
+		def initialize(@type)
 		end
 
-class Naka::Timer
-	getter start
-	getter last_update
-
-	def initialize
-		@start = Time.now
-		@last_update = @start
-	end
-
-	def step
-		now = Time.now
-
-		dt = now.epoch_ms - @last_update.epoch_ms
-
-		@last_update = now
-
-		dt
-	end
-end
-
-class Naka::Event
-	class Quit
-	end
-
-	class Draw
-		getter window : Naka::Window
-
-		def initialize(@window)
-		end
-	end
-
-	class Update
-		getter dt : Int64
-
-		def initialize(@dt)
-		end
-	end
-
-	# FIXME: Split in KeyUp and KeyDown.
-	class KeyUp
-		getter key : LibSDL::Keycode
-		getter scan_code : LibSDL::Scancode
-
-		def initialize(@key, @scan_code)
-		end
-	end
-	class KeyDown
-		getter key : LibSDL::Keycode
-		getter scan_code : LibSDL::Scancode
-		getter repeat : Bool
-
-		def initialize(@key, @scan_code, @repeat)
-		end
-	end
-
-	# FIXME: THIS MAIN LOOP IS **NOT** READY FOR PRODUCTION
-	#        Update events are still missing, and both Draw and Update should
-	#        be time-based.
-	# Why having a `window` parameter instead of making a Window#loop method?
-	# Because we may want to have a `windows` parameter in the future, although
-	# unlikely. But still possible.
-	def self.loop(window, &block)
-		max_fps = 60
-		max_dt = 1000. / 60
-
-		timer = Naka::Timer.new
-
-		renderer = window.renderer
-
-		::loop do
-			exit_requested = false
-
-			while event = SDL::Event.poll
-				r_value = yield case event
-				when SDL::Event::Quit
-					Naka::Event::Quit.new
-				when SDL::Event::Keyboard
-					keysym = event.keysym
-					if event.type == LibSDL::EventType::KEYUP
-						Naka::Event::KeyUp.new keysym.sym, keysym.scancode
-					elsif event.type == LibSDL::EventType::KEYDOWN
-						Naka::Event::KeyDown.new keysym.sym, keysym.scancode, event.repeat != 0
-					end
-				else # FIXME: Most event types may need proper Naka:: classes.
-					event
-				end
-
-				if r_value == Naka::Event::Quit
-					exit_requested = true
-					break
-				end
-			end
-
-			break if exit_requested
-
-			dt = timer.step
-
-			r_value = yield Naka::Event::Update.new dt
-
-			break if r_value == Naka::Event::Quit
-
-			renderer.draw_color = SDL::Color[255, 255, 255, 255]
-			renderer.clear
-
-			yield Naka::Event::Draw.new window
-
-			renderer.present
-
-			sleep 0.001
+		def to_json(builder)
+			builder.object do
+				builder.field "type", @type
 			end
 		end
 	end
 
-## Actual application code comes here
+	class Tile < Array(Object)
+		def initialize(element)
+			initialize
+
+			self << element
+		end
+	end
+
+	CHUNK_SIZE = 32
+	class Chunk
+		property tiles : Array(Array(Tile))
+		getter x : Int32
+		getter y : Int32
+
+		def initialize(@x, @y, map)
+			p "Creating Map::Chunk"
+
+			@tiles = Array.new(CHUNK_SIZE) do |x|
+				x += @x * CHUNK_SIZE
+
+				Array.new(CHUNK_SIZE) do |y|
+					y += @y * CHUNK_SIZE
+
+					Tile.new(Object.new "stone").tap do |i|
+						altitude = map.altitude_maps.get(x, y) + 0.5
+
+						humidity = map.humidity_maps.get(x, y) + 0.5
+
+						evil = map.evil_maps.get(x, y)
+
+						if altitude < 0.25
+							i << Object.new "sand"
+
+							if altitude < 0.175
+								i << Object.new "water"
+							else
+								if humidity < 0.33
+									i << Object.new "sand"
+								else
+									i << Object.new "dirt"
+								end
+							end
+						elsif altitude < 0.75
+							i << Object.new "dirt"
+
+							if evil > 0.5
+								i << Object.new "haunted"
+							else
+								i << Object.new "grass"
+							end
+
+							if altitude > 0.35 && altitude < 0.65
+								if humidity > 0.4
+									if humidity > 0.8
+										i << Object.new "tree"
+									elsif humidity < 0.6
+										i << Object.new "pine"
+									else
+										if Random.rand(2) == 0
+											i << Object.new "tree"
+										else
+											i << Object.new "pine"
+										end
+									end
+								else
+									if Random.rand(10) == 0
+										i << Object.new "flowers"
+									end
+								end
+							end
+						elsif altitude > 0.85
+							i << Object.new "rocks"
+						end
+					end
+				end
+			end
+		end
+
+		def to_json
+			{
+				:x => @x,
+				:y => @y,
+				:tiles => @tiles
+			}.to_json
+		end
+
+		def get(x, y)
+			@tiles[x][y]
+		end
+	end
+
+	@chunks = Hash(Int32, Hash(Int32, Chunk)).new
+
+	def get_chunk(x, y)
+		chunks_list = @chunks[x]?
+		if chunks_list.nil?
+			chunks_list = Hash(Int32, Chunk).new
+			@chunks[x] = chunks_list
+		end
+
+		chunk = chunks_list[y]?
+		if chunk.nil?
+			chunk = Chunk.new x, y, self
+			chunks_list[y] = chunk
+
+			save chunk
+		end
+
+		chunk
+	end
+
+	def save(chunk : Chunk)
+		File.write "#{@save_directory}/chunk-#{chunk.x}-#{chunk.y}.json", chunk.to_json
+	end
+
+	def get(x, y)
+		get_chunk(x / CHUNK_SIZE, y / CHUNK_SIZE).get(x % CHUNK_SIZE, y % CHUNK_SIZE)
+	end
+end
+
+class ImagesLoader
+	getter grass : SDL::Texture
+	getter stone : SDL::Texture
+	getter dirt  : SDL::Texture
+	getter tree  : SDL::Texture
+	getter pine  : SDL::Texture
+	getter flowers  : SDL::Texture
+	getter sand  : SDL::Texture
+	getter water : SDL::Texture
+	getter haunted  : SDL::Texture
+	getter rocks  : SDL::Texture
+
+	def initialize(window)
+		@grass = window.newImage "assets/grass.png"
+		@stone = window.newImage "assets/stone.png"
+		@dirt  = window.newImage "assets/dirt.png"
+		@tree  = window.newImage "assets/tree.png"
+		@flowers  = window.newImage "assets/flowers.png"
+		@sand  = window.newImage "assets/sand.png"
+		@water = window.newImage "assets/water.png"
+		@haunted  = window.newImage "assets/haunted.png"
+		@pine  = window.newImage "assets/tree_pine.png"
+		@rocks  = window.newImage "assets/rocks.png"
+	end
+end
 
 Naka.init
 
-window = Naka::Window.new "Test", 640, 480 
+window = Naka::Window.new "Test", 16*128, 16*128, flags: LibSDL::WindowFlags::RESIZABLE | LibSDL::WindowFlags::SHOWN | LibSDL::WindowFlags::OPENGL
 
-naka = window.newImage "naka.png"
+images = ImagesLoader.new window
+
+connection_font = window.newFont "Connection.otf", 30.5
+window.set_font connection_font
+
+map = Map.new "map-test-01"
 
 Naka::Event.loop window do |event|
 	case event
@@ -169,7 +213,54 @@ Naka::Event.loop window do |event|
 		next Naka::Event::Quit
 	when Naka::Event::Update
 	when Naka::Event::Draw
-		event.window.draw naka, 20, 20
+		zoom_level = 1.0
+
+		128.times do |x|
+			128.times do |y|
+				tile = map.get x, y
+
+				# FIXME:
+				#   - Please don’t draw more than one layer of ground…
+				#   - Transitions. (eg. between dirt and grass)
+				tile.each do |object|
+					image = case object.type
+					when "grass"
+						images.grass
+					when "dirt"
+						images.dirt
+					when "stone"
+						images.stone
+					when "tree"
+						images.tree
+					when "pine"
+						images.pine
+					when "flowers"
+						images.flowers
+					when "water"
+						images.water
+					when "haunted"
+						images.haunted
+					when "sand"
+						images.sand
+					when "rocks"
+						images.rocks
+					else
+						images.stone
+					end
+
+					window.draw(
+						image,
+						x: (x * 16 * zoom_level).to_i,
+						y: (y * 16 * zoom_level - (image.height - 16) * zoom_level).to_i,
+						scale_x: zoom_level,
+						scale_y: zoom_level
+					)
+				end
+			end
+		end
+
+		# Urgh. This shit eats CPU. Fonts need goddamn fixing.
+		#window.print "The quick brown fox jumps over the lazy dog.", 50, 50
 	when Naka::Event::KeyUp, Naka::Event::KeyDown
 		pp! event
 	end

src/naka.cr

@@ -0,0 +1,203 @@
+
+require "sdl"
+require "sdl/image"
+require "sdl/ttf"
+
+class Naka
+end
+
+require "./noise.cr"
+
+## Helper code comes here
+
+class Naka
+	def self.init
+		SDL.init SDL::Init::VIDEO
+		SDL::IMG.init SDL::IMG::Init::PNG
+		SDL::TTF.init
+
+		at_exit {
+			SDL.quit
+			SDL::TTF.quit
+		}
+	end
+end
+
+class Naka::Renderer < SDL::Renderer
+end
+
+class Naka::Window
+	alias Flags = LibSDL::WindowFlags
+	alias Position = LibSDL::WindowPosition
+
+	getter renderer
+
+	@current_font : SDL::TTF::Font? = nil
+
+	def initialize(title, width, height,
+				   x : Position = Position::UNDEFINED,
+				   y : Position = Position::UNDEFINED,
+				   flags : Flags = Flags::SHOWN)
+
+		@window = SDL::Window.new(title, width, height, x, y, flags)
+		@renderer = Naka::Renderer.new @window
+
+		@renderer.draw_blend_mode = SDL::BlendMode::BLEND
+	end
+
+	def newImage(file_path) : SDL::Texture
+		SDL::IMG.load(file_path, @renderer).tap do |texture|
+			texture.blend_mode = SDL::BlendMode::BLEND
+		end
+	end
+
+	def newFont(file_path, font_size = 12) : SDL::TTF::Font
+		SDL::TTF::Font.new file_path, font_size
+	end
+
+	# FIXME: We’ll probably want options for scaling, rotations, and so on.
+	def draw(texture : SDL::Texture, x : Int32, y : Int32, scale_x = 1, scale_y = 1)
+		@renderer.copy texture,
+			dstrect: SDL::Rect[x, y, (texture.width * scale_x).to_i, (texture.height * scale_y).to_i]
+	end
+
+	def draw(surface : SDL::Surface, x : Int32, y : Int32)
+		@renderer.copy surface,
+			dstrect: SDL::Rect[x, y, surface.width, surface.height]
+	end
+
+	def set_font(@current_font)
+	end
+
+	# FIXME:
+	#  - This only prints properly “solid” text. Shaded text (depixelated)
+	#    would need some additional OpenGL manipulations.
+	#  - This is very inefficient resources-wise. If we are willing to drop
+	#    ligatures support (is it even supported in SDL::TTF?), we should
+	#    build a textures atlas of all glyphs and use that to render text.
+	#  - Alternatively, it may be worth it to let users generate a texture of
+	#    some text and draw it, manually.
+	def print(text, x, y)
+		font = @current_font
+
+		return if font.nil?
+
+		surface = font.render_solid(text, SDL::Color[0, 0, 0, 255], @renderer.draw_color)
+
+		draw surface, x, y
+	end
+end
+
+class Naka::Timer
+	getter start
+	getter last_update
+
+	def initialize
+		@start = Time.now
+		@last_update = @start
+	end
+
+	def step
+		now = Time.now
+
+		dt = now.epoch_ms - @last_update.epoch_ms
+
+		@last_update = now
+
+		dt
+	end
+end
+
+class Naka::Event
+	class Quit
+	end
+
+	class Draw
+		getter window : Naka::Window
+
+		def initialize(@window)
+		end
+	end
+
+	class Update
+		getter dt : Int64
+
+		def initialize(@dt)
+		end
+	end
+
+	# FIXME: Split in KeyUp and KeyDown.
+	class KeyUp
+		getter key : LibSDL::Keycode
+		getter scan_code : LibSDL::Scancode
+
+		def initialize(@key, @scan_code)
+		end
+	end
+	class KeyDown
+		getter key : LibSDL::Keycode
+		getter scan_code : LibSDL::Scancode
+		getter repeat : Bool
+
+		def initialize(@key, @scan_code, @repeat)
+		end
+	end
+
+	# FIXME: THIS MAIN LOOP IS **NOT** READY FOR PRODUCTION
+	#        Update events are still missing, and both Draw and Update should
+	#        be time-based.
+	# Why having a `window` parameter instead of making a Window#loop method?
+	# Because we may want to have a `windows` parameter in the future, although
+	# unlikely. But still possible.
+	def self.loop(window, &block)
+		max_fps = 60
+		max_dt = 1000. / 60
+
+		timer = Naka::Timer.new
+
+		renderer = window.renderer
+
+		::loop do
+			exit_requested = false
+
+			while event = SDL::Event.poll
+				r_value = yield case event
+				when SDL::Event::Quit
+					Naka::Event::Quit.new
+				when SDL::Event::Keyboard
+					keysym = event.keysym
+					if event.type == LibSDL::EventType::KEYUP
+						Naka::Event::KeyUp.new keysym.sym, keysym.scancode
+					elsif event.type == LibSDL::EventType::KEYDOWN
+						Naka::Event::KeyDown.new keysym.sym, keysym.scancode, event.repeat != 0
+					end
+				else # FIXME: Most event types may need proper Naka:: classes.
+					event
+				end
+
+				if r_value == Naka::Event::Quit
+					exit_requested = true
+					break
+				end
+			end
+
+			break if exit_requested
+
+			dt = timer.step
+
+			r_value = yield Naka::Event::Update.new dt
+
+			break if r_value == Naka::Event::Quit
+
+			renderer.draw_color = SDL::Color[255, 255, 255, 255]
+			renderer.clear
+
+			yield Naka::Event::Draw.new window
+
+			renderer.present
+
+			sleep 0.001
+		end
+	end
+end
+

src/noise.cr

@@ -0,0 +1,105 @@
+
+# FIXME: We may want to generate noise of other numbers of dimensions.
+class Naka::Noise2D
+	class Octave
+		record Vec2, x : Float64, y : Float64
+
+		private def lerp(a, b, v)
+			a * (1.0 - v) + b * v
+		end
+
+		private def smooth(v)
+			v * v * (3.0 - 2.0 * v)
+		end
+
+		private def gradient(orig, grad, p)
+			sp = Vec2.new(p.x - orig.x, p.y - orig.y)
+			grad.x * sp.x + grad.y * sp.y
+		end
+
+		private def random_gradient
+			v = rand * Math::PI * 2.0
+			Vec2.new(Math.cos(v), Math.sin(v))
+		end
+
+		@frequency : Float64 | Int32
+		@amplitude : Float64 | Int32
+
+		def amplitude
+			@amplitude.to_f
+		end
+		def frequency
+			@frequency.to_f
+		end
+
+		def initialize(@frequency, @amplitude)
+			@rgradients = StaticArray(Vec2, 256).new { random_gradient }
+			@permutations = StaticArray(Int32, 256).new { |i| i }
+			@permutations.shuffle!
+		end
+
+		def get_gradient(x, y)
+			idx = @permutations[x & 255] + @permutations[y & 255]
+			@rgradients[idx & 255]
+		end
+
+		def get_gradients(x, y)
+			x0f = x.floor
+			y0f = y.floor
+			x0 = x0f.to_i
+			y0 = y0f.to_i
+			x1 = x0 + 1
+			y1 = y0 + 1
+
+			{
+				{
+					get_gradient(x0, y0),
+					get_gradient(x1, y0),
+					get_gradient(x0, y1),
+					get_gradient(x1, y1),
+				},
+				{
+					Vec2.new(x0f + 0.0, y0f + 0.0),
+					Vec2.new(x0f + 1.0, y0f + 0.0),
+					Vec2.new(x0f + 0.0, y0f + 1.0),
+					Vec2.new(x0f + 1.0, y0f + 1.0),
+				},
+			}
+		end
+
+		def get(x, y)
+			x = x.to_f / @frequency
+			y = y.to_f / @frequency
+
+			p = Vec2.new(x, y)
+			gradients, origins = get_gradients(x, y)
+			v0 = gradient(origins[0], gradients[0], p)
+			v1 = gradient(origins[1], gradients[1], p)
+			v2 = gradient(origins[2], gradients[2], p)
+			v3 = gradient(origins[3], gradients[3], p)
+			fx = smooth(x - origins[0].x)
+			vx0 = lerp(v0, v1, fx)
+			vx1 = lerp(v2, v3, fx)
+			fy = smooth(y - origins[0].y)
+
+			lerp(vx0, vx1, fy) * @amplitude.to_f
+		end
+	end
+
+
+	@storage = Array(Octave).new
+	def initialize
+	end
+	def initialize(a, f)
+		add_octave a, f
+	end
+
+	def add_octave(a, f)
+		@storage << Octave.new a, f
+	end
+
+	def get(x, y)
+		@storage.reduce 0 { |a, e| a + e.get(x, y) }
+	end
+end
+