Misc bug fixes and improvements

lib/cyberarm_engine.rb

@@ -66,6 +66,6 @@ require_relative "cyberarm_engine/model/material"
 require_relative "cyberarm_engine/model/model_object"
 require_relative "cyberarm_engine/model/parser"
 require_relative "cyberarm_engine/model/parsers/wavefront_parser"
-require_relative "cyberarm_engine/model/parsers/collada_parser" if defined?(Nokogiri)
+require_relative "cyberarm_engine/model/parsers/collada_parser" if RUBY_ENGINE != "mruby" && defined?(Nokogiri)
 
 require_relative "cyberarm_engine/builtin/intro_state"

lib/cyberarm_engine/builtin/intro_state.rb

@@ -18,7 +18,7 @@ module CyberarmEngine
 
       @gosu_logo = generate_proxy("Gosu",     "Game Library",         0xff_111111)
       @ruby_logo = generate_proxy("Ruby",     "Programming Language", 0xff_880000)
-      @opengl_logo = generate_proxy("OpenGL", "Graphics API",         0xff_5586a4) if defined?(OpenGL)
+      @opengl_logo = generate_proxy("OpenGL", "Graphics API",         0xff_5586a4) if RUBY_ENGINE != "mruby" && defined?(OpenGL)
 
       base_time = Gosu.milliseconds
 

lib/cyberarm_engine/common.rb

@@ -52,7 +52,7 @@ module CyberarmEngine
     end
 
     def lighten(color, amount = 25)
-      if defined?(color.alpha)
+      if color.respond_to?(:alpha)
         Gosu::Color.rgba(color.red + amount, color.green + amount, color.blue + amount, color.alpha)
       else
         Gosu::Color.rgb(color.red + amount, color.green + amount, color.blue + amount)
@@ -60,7 +60,7 @@ module CyberarmEngine
     end
 
     def darken(color, amount = 25)
-      if defined?(color.alpha)
+      if color.respond_to?(:alpha)
         Gosu::Color.rgba(color.red - amount, color.green - amount, color.blue - amount, color.alpha)
       else
         Gosu::Color.rgb(color.red - amount, color.green - amount, color.blue - amount)

lib/cyberarm_engine/console.rb

@@ -103,7 +103,7 @@ module CyberarmEngine
 
     def button_down(id)
       case id
-      when Gosu::KbEnter, Gosu::KbReturn
+      when Gosu::KB_ENTER, Gosu::KB_RETURN
         return unless @text_input.text.length.positive?
 
         @history.text += "\n<c=999999>> #{@text_input.text}</c>"
@@ -113,12 +113,12 @@ module CyberarmEngine
         handle_command
         @text_input.text = ""
 
-      when Gosu::KbUp
+      when Gosu::KB_UP
         @command_history_index -= 1
         @command_history_index = 0 if @command_history_index.negative?
         @text_input.text = @command_history[@command_history_index]
 
-      when Gosu::KbDown
+      when Gosu::KB_DOWN
         @command_history_index += 1
         if @command_history_index > @command_history.size - 1
           @text_input.text = "" unless @command_history_index > @command_history.size
@@ -127,7 +127,7 @@ module CyberarmEngine
           @text_input.text = @command_history[@command_history_index]
         end
 
-      when Gosu::KbTab
+      when Gosu::KB_TAB
         split = @text_input.text.split(" ")
 
         if !@text_input.text.end_with?(" ") && split.size == 1
@@ -142,7 +142,7 @@ module CyberarmEngine
           cmd.autocomplete(self)
         end
 
-      when Gosu::KbBacktick
+      when Gosu::KB_BACKTICK
         # Remove backtick character from input
         @text_input.text = if @text_input.text.size > 1
                              @text_input.text[0..@text_input.text.size - 2]
@@ -151,7 +151,7 @@ module CyberarmEngine
                            end
 
       # Copy
-      when Gosu::KbC
+      when Gosu::KB_C
         if control_down? && shift_down?
           @memory = @text_input.text[caret_start..caret_end - 1] if caret_start != caret_end
           p @memory
@@ -160,7 +160,7 @@ module CyberarmEngine
         end
 
       # Paste
-      when Gosu::KbV
+      when Gosu::KB_V
         if control_down? && shift_down?
           string = @text_input.text.chars.insert(caret_pos, @memory).join
           _caret_pos = caret_pos
@@ -170,7 +170,7 @@ module CyberarmEngine
         end
 
       # Cut
-      when Gosu::KbX
+      when Gosu::KB_X
         if control_down? && shift_down?
           @memory = @text_input.text[caret_start..caret_end - 1] if caret_start != caret_end
           string  = @text_input.text.chars
@@ -182,7 +182,7 @@ module CyberarmEngine
         end
 
       # Delete word to left of caret
-      when Gosu::KbW
+      when Gosu::KB_W
         if control_down?
           split = @text_input.text.split(" ")
           split.delete(split.last)
@@ -190,7 +190,7 @@ module CyberarmEngine
         end
 
       # Clear history
-      when Gosu::KbL
+      when Gosu::KB_L
         @history.text = "" if control_down?
       end
     end

lib/cyberarm_engine/game_object.rb

@@ -42,7 +42,7 @@ module CyberarmEngine
         @radius = if options[:radius]
                     options[:radius]
                   else
-                    defined?(@image.width) ? ((@image.width + @image.height) / 4) * scale : 1
+                    @image.respond_to?(:width) ? ((@image.width + @image.height) / 4) * scale : 1
                   end
       end
     end

lib/cyberarm_engine/model.rb

@@ -50,7 +50,8 @@ module CyberarmEngine
       @objects.each { |o| @vertex_count += o.vertices.size }
 
       start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_millisecond)
-      # build_collision_tree
+      build_collision_tree
+      puts "    Building mesh collision tree took #{((Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_millisecond) - start_time) / 1000.0).round(2)} seconds"
     end
 
     def parse(parser)
@@ -177,7 +178,7 @@ module CyberarmEngine
     end
 
     def build_collision_tree
-      @aabb_tree = AABBTree.new
+      @aabb_tree = IMICFPS::AABBTree.new
 
       @faces.each do |face|
         box = BoundingBox.new

lib/cyberarm_engine/opengl/renderer/renderer.rb

@@ -8,8 +8,19 @@ module CyberarmEngine
     end
 
     def draw(camera, lights, entities)
+      Stats.frame.start_timing(:opengl_renderer)
+
+      Stats.frame.start_timing(:opengl_model_renderer)
       @opengl_renderer.render(camera, lights, entities)
-      @bounding_box_renderer.render(entities) if @show_bounding_boxes
+      Stats.frame.end_timing(:opengl_model_renderer)
+
+      if @show_bounding_boxes
+        Stats.frame.start_timing(:opengl_boundingbox_renderer)
+        @bounding_box_renderer.render(entities)
+        Stats.frame.end_timing(:opengl_boundingbox_renderer)
+      end
+
+      Stats.frame.end_timing(:opengl_renderer)
     end
 
     def canvas_size_changed

lib/cyberarm_engine/stats.rb

@@ -1,20 +1,191 @@
 module CyberarmEngine
   class Stats
-    @@hash = {
-      gui_recalculations_last_frame: 0
-    }
+    @frames = []
+    @frame_index = -1
+    @max_frame_history = 1024
 
-    def self.get(key)
-      @@hash.dig(key)
+    def self.new_frame
+      if @frames.size < @max_frame_history
+        @frames << Frame.new
+      else
+        @frames[@frame_index] = Frame.new
+      end
     end
 
-    def self.increment(key, n)
-      @@hash[key] += n
+    def self.frame
+      @frames[@frame_index]
     end
 
-    def self.clear
-      @@hash.each do |key, _value|
-        @@hash[key] = 0
+    def self.end_frame
+      frame&.complete
+
+      @frame_index += 1
+      @frame_index %= @max_frame_history
+    end
+
+    def self.frames
+      if @frames.size < @max_frame_history
+        @frames
+      else
+        @frames.rotate(@frame_index - (@max_frame_history - (@frames.size - 1)))
+      end
+    end
+
+    def self.frame_index
+      @frame_index
+    end
+
+    def self.max_frame_history
+      @max_frame_history
+    end
+
+    class Frame
+      Timing = Struct.new(:start_time, :end_time, :duration)
+
+      attr_reader :frame_timing, :counters, :timings, :multitimings
+      def initialize
+        @frame_timing = Timing.new(Gosu.milliseconds, -1, -1)
+        @attempted_multitiming = false
+
+        @counters = {
+          gui_recalculations: 0
+        }
+
+        @timings = {}
+        @multitimings = {}
+      end
+
+      def increment(key, number = 1)
+        @counters[key] ||= 0
+        @counters[key] += number
+      end
+
+      def start_timing(key)
+        raise "key must be a symbol!" unless key.is_a?(Symbol)
+        if @timings[key]
+          # FIXME: Make it not spammy...
+          # warn "Only one timing per key per frame. (Timing for #{key.inspect} already exists!)"
+          @attempted_multitiming = true
+          @multitimings[key] = true
+
+          return
+        end
+
+        @timings[key] = Timing.new(Gosu.milliseconds, -1, -1)
+      end
+
+      def end_timing(key)
+        timing = @timings[key]
+
+        # FIXME: Make it not spammy...
+        # warn "Timing #{key.inspect} already ended!" if timing.end_time != -1
+
+        timing.end_time = Gosu.milliseconds
+        timing.duration = timing.end_time - timing.start_time
+      end
+
+      def complete
+        @frame_timing.end_time = Gosu.milliseconds
+        @frame_timing.duration = @frame_timing.end_time - @frame_timing.start_time
+
+        # Lock data structures
+        @frame_timing.freeze
+        @counters.freeze
+        @timings.freeze
+        @multitimings.freeze
+      end
+
+      def complete?
+        @frame_timing.duration != -1
+      end
+
+      def attempted_multitiming?
+        @attempted_multitiming
+      end
+    end
+
+    class StatsPlotter
+      attr_reader :position
+
+      def initialize(x, y, z = Float::INFINITY, width = 128, height = 128)
+        @position = Vector.new(x, y, z)
+        @width = width
+        @height = height
+
+        @padding = 2
+        @text_size = 16
+
+        @max_timing_label = CyberarmEngine::Text.new("", x: x + @padding + 1, y: y + @padding, z: z, size: @text_size, border: true)
+        @avg_timing_label = CyberarmEngine::Text.new("", x: x + @padding + 1, y: y + @padding + @height / 2 - @text_size / 2, z: z, size: @text_size, border: true)
+        @min_timing_label = CyberarmEngine::Text.new("", x: x + @padding + 1, y: y + @height - (@text_size + @padding / 2), z: z, size: @text_size, border: true)
+
+        @timings_label = CyberarmEngine::Text.new("", x: x + @padding + @width + @padding, y: y + @padding, z: z, size: @text_size, border: true)
+
+        @frame_stats = []
+        @graphs = {
+          frame_timings: []
+        }
+      end
+
+      def calculate_graphs
+        calculate_frame_timings_graph
+      end
+
+      def calculate_frame_timings_graph
+        @graphs[:frame_timings].clear
+
+        samples = @width - @padding
+        nodes = Array.new(samples.ceil) { [] }
+
+        slice = 0
+        @frame_stats.each_slice((CyberarmEngine::Stats.max_frame_history / samples.to_f).ceil) do |bucket|
+          bucket.each do |frame|
+            nodes[slice] << frame.frame_timing.duration
+          end
+
+          slice += 1
+        end
+
+        nodes.each_with_index do |cluster, i|
+          break if cluster.empty?
+
+          @graphs[:frame_timings] << CyberarmEngine::Vector.new(@position.x + @padding + 1 * i, (@position.y + @height - @padding) - cluster.max)
+        end
+      end
+
+      def draw
+        @frame_stats = CyberarmEngine::Stats.frames.select(&:complete?)
+        return if @frame_stats.empty?
+
+        calculate_graphs
+
+        @max_timing_label.text = "Max: #{@frame_stats.map { |f| f.frame_timing.duration }.max.to_s.rjust(3, " ")}ms"
+        @avg_timing_label.text = "Avg: #{(@frame_stats.map { |f| f.frame_timing.duration }.sum / @frame_stats.size).to_s.rjust(3, " ")}ms"
+        @min_timing_label.text = "Min: #{@frame_stats.map { |f| f.frame_timing.duration }.min.to_s.rjust(3, " ")}ms"
+
+        Gosu.draw_rect(@position.x, @position.y, @width, @height, 0xaa_222222, @position.z)
+        Gosu.draw_rect(@position.x + @padding, @position.y + @padding, @width - @padding * 2, @height - @padding * 2, 0xaa_222222, @position.z)
+
+        draw_graphs
+
+        @max_timing_label.draw
+        @avg_timing_label.draw
+        @min_timing_label.draw
+
+        # TODO: Make this optional
+        draw_timings
+      end
+
+      def draw_graphs
+        Gosu.draw_path(@graphs[:frame_timings], Gosu::Color::WHITE, Float::INFINITY)
+      end
+
+      def draw_timings
+        frame = @frame_stats.last
+
+        @timings_label.text = "#{frame.attempted_multitiming? ? "<c=d00>Attempted Multitiming!\nTimings may be inaccurate for:\n#{frame.multitimings.map { |m, _| m}.join("\n") }</c>\n\n" : ''}#{frame.timings.map { |t, v| "#{t}: #{v.duration}ms" }.join("\n")}"
+        Gosu.draw_rect(@timings_label.x - @padding, @timings_label.y - @padding, @timings_label.width + @padding * 2, @timings_label.height + @padding * 2, 0xdd_222222, @position.z)
+        @timings_label.draw
       end
     end
   end

lib/cyberarm_engine/text.rb

@@ -81,6 +81,7 @@ module CyberarmEngine
         @size = size
         @font = font_name
 
+        invalidate_cache!
         @textobject = check_cache(size, font_name)
       end
     end
@@ -149,6 +150,8 @@ module CyberarmEngine
     end
 
     def markup_width(text = @text)
+      text = text.to_s
+
       spacing = 0
       spacing += @border_size if @border
       spacing += @shadow_size if @shadow

lib/cyberarm_engine/ui/element.rb

@@ -196,7 +196,7 @@ module CyberarmEngine
     end
 
     def enter(_sender)
-      @focus = false unless window.button_down?(Gosu::MsLeft)
+      @focus = false unless Gosu.button_down?(Gosu::MS_LEFT)
 
       if !@enabled
         update_styles(:disabled)
@@ -316,7 +316,8 @@ module CyberarmEngine
     end
 
     def debug_draw
-      return if defined?(GUI_DEBUG_ONLY_ELEMENT) && self.class == GUI_DEBUG_ONLY_ELEMENT
+      # FIXME
+      return# if const_defined?(GUI_DEBUG_ONLY_ELEMENT) && self.class == GUI_DEBUG_ONLY_ELEMENT
 
       Gosu.draw_line(
         x, y, @debug_color,
@@ -461,15 +462,13 @@ module CyberarmEngine
       if @parent && @style.fill &&
          (dimension == :width && @parent.is_a?(Flow) ||
           dimension == :height && @parent.is_a?(Stack))
-        return space_available_width - noncontent_width if dimension == :width && @parent.is_a?(Flow)
-        return space_available_height - noncontent_height if dimension == :height && @parent.is_a?(Stack)
-
-      # Handle min_width/height and max_width/height
-      else
-        return @style.send(:"min_#{dimension}") if @style.send(:"min_#{dimension}") && new_size.to_f < @style.send(:"min_#{dimension}")
-        return @style.send(:"max_#{dimension}") if @style.send(:"max_#{dimension}") && new_size.to_f > @style.send(:"max_#{dimension}")
+        new_size = space_available_width - noncontent_width if dimension == :width && @parent.is_a?(Flow)
+        new_size = space_available_height - noncontent_height if dimension == :height && @parent.is_a?(Stack)
       end
 
+      return @style.send(:"min_#{dimension}") if @style.send(:"min_#{dimension}") && new_size.to_f < @style.send(:"min_#{dimension}")
+      return @style.send(:"max_#{dimension}") if @style.send(:"max_#{dimension}") && new_size.to_f > @style.send(:"max_#{dimension}")
+
       new_size
     end
 

lib/cyberarm_engine/ui/elements/container.rb

@@ -118,7 +118,7 @@ module CyberarmEngine
 
         return unless visible?
 
-        Stats.increment(:gui_recalculations_last_frame, 1)
+        Stats.frame.increment(:gui_recalculations)
 
         stylize
 
@@ -176,7 +176,7 @@ module CyberarmEngine
           child.recalculate
           child.reposition # TODO: Implement top,bottom,left,center, and right positioning
 
-          Stats.increment(:gui_recalculations_last_frame, 1)
+          Stats.frame.increment(:gui_recalculations)
 
           child.element_visible = child.x >= @x - child.width && child.x <= @x + width &&
                                   child.y >= @y - child.height && child.y <= @y + height
@@ -186,6 +186,9 @@ module CyberarmEngine
 
         update_background
 
+        # Fixes resized container scrolled past bottom
+        self.scroll_top = -@scroll_position.y
+
         root.gui_state.request_repaint if @width != old_width || @height != old_height
       end
 

lib/cyberarm_engine/ui/elements/slider.rb

@@ -33,7 +33,8 @@ module CyberarmEngine
         end
       end
 
-      attr_reader :range, :step_size, :value
+      attr_reader :step_size, :value
+      attr_accessor :range, :step_size
 
       def initialize(options = {}, block = nil)
         super(options, block)
@@ -76,7 +77,7 @@ module CyberarmEngine
       def update
         super
 
-        @tip = value.to_s
+        @tip = format("%.2f", value.to_f)
         @handle.tip = @tip
       end
 
@@ -87,7 +88,7 @@ module CyberarmEngine
       end
 
       def handle_dragged_to(x, _y)
-        @ratio = ((x - @handle.width / 2) - @x) / (content_width - @handle.outer_width)
+        @ratio = ((x - @handle.width / 2.0) - @x) / (content_width - @handle.outer_width.to_f)
 
         self.value = @ratio.clamp(0.0, 1.0) * (@range.max - @range.min) + @range.min
       end

lib/cyberarm_engine/ui/elements/text_block.rb

@@ -18,6 +18,15 @@ module CyberarmEngine
         @raw_text = text
       end
 
+      def update
+        super
+
+        if @text.textobject.name != safe_style_fetch(:font)
+          set_font
+          root.gui_state.request_recalculate
+        end
+      end
+
       def render
         # Gosu.clip_to is too expensive to always use so check if we actually need it.
         if @text.width > width || @text.height > height
@@ -156,7 +165,7 @@ module CyberarmEngine
       end
 
       def line_width(text)
-        (@text.textobject.markup_width(text) + noncontent_width)
+        (@text.textobject.markup_width(text.to_s) + noncontent_width)
       end
 
       def value

lib/cyberarm_engine/ui/gui_state.rb

@@ -63,7 +63,8 @@ module CyberarmEngine
         @tip.draw
       end
 
-      if defined?(GUI_DEBUG)
+      # FIXME
+      if false# defined?(GUI_DEBUG)
         Gosu.flush
 
         @root_container.debug_draw
@@ -78,16 +79,23 @@ module CyberarmEngine
 
     def update
       if @pending_recalculate_request
+        Stats.frame.start_timing(:gui_recalculate)
         @root_container.recalculate
         @root_container.recalculate
         @root_container.recalculate
 
         @pending_recalculate_request = false
+
+        Stats.frame.end_timing(:gui_recalculate)
       end
 
+      Stats.frame.start_timing(:gui_element_recalculate_requests)
+
       @pending_element_recalculate_requests.each(&:recalculate)
       @pending_element_recalculate_requests.clear
 
+      Stats.frame.end_timing(:gui_element_recalculate_requests)
+
       if @pending_focus_request
         @pending_focus_request = false
 
@@ -121,9 +129,9 @@ module CyberarmEngine
       @mouse_over.publish(:leave) if @mouse_over && new_mouse_over != @mouse_over
       @mouse_over = new_mouse_over
 
-      redirect_holding_mouse_button(:left) if @mouse_over && Gosu.button_down?(Gosu::MsLeft)
-      redirect_holding_mouse_button(:middle) if @mouse_over && Gosu.button_down?(Gosu::MsMiddle)
-      redirect_holding_mouse_button(:right) if @mouse_over && Gosu.button_down?(Gosu::MsRight)
+      redirect_holding_mouse_button(:left) if @mouse_over && Gosu.button_down?(Gosu::MS_LEFT)
+      redirect_holding_mouse_button(:middle) if @mouse_over && Gosu.button_down?(Gosu::MS_MIDDLE)
+      redirect_holding_mouse_button(:right) if @mouse_over && Gosu.button_down?(Gosu::MS_RIGHT)
 
       if Vector.new(window.mouse_x, window.mouse_y) == @last_mouse_pos
         if @mouse_over && (Gosu.milliseconds - @mouse_moved_at) > tool_tip_delay
@@ -151,13 +159,13 @@ module CyberarmEngine
       super
 
       case id
-      when Gosu::MsLeft
+      when Gosu::MS_LEFT
         redirect_mouse_button(:left)
-      when Gosu::MsMiddle
+      when Gosu::MS_MIDDLE
         redirect_mouse_button(:middle)
-      when Gosu::MsRight
+      when Gosu::MS_RIGHT
         redirect_mouse_button(:right)
-      when Gosu::KbF5
+      when Gosu::KB_F5
         request_recalculate
       end
 
@@ -168,15 +176,15 @@ module CyberarmEngine
       super
 
       case id
-      when Gosu::MsLeft
+      when Gosu::MS_LEFT
         redirect_released_mouse_button(:left)
-      when Gosu::MsMiddle
+      when Gosu::MS_MIDDLE
         redirect_released_mouse_button(:middle)
-      when Gosu::MsRight
+      when Gosu::MS_RIGHT
         redirect_released_mouse_button(:right)
-      when Gosu::MsWheelUp
+      when Gosu::MS_WHEEL_UP
         redirect_mouse_wheel(:up)
-      when Gosu::MsWheelDown
+      when Gosu::MS_WHEEL_DOWN
         redirect_mouse_wheel(:down)
       end
 
@@ -276,6 +284,8 @@ module CyberarmEngine
     def hide_menu
       return unless @menu
 
+      request_repaint
+
       @hid_menu_for = @menu.parent
       @menu = nil
     end

lib/cyberarm_engine/ui/style.rb

@@ -20,7 +20,8 @@ module CyberarmEngine
     attr_reader :hash
 
     def initialize(hash = {})
-      h = Marshal.load(Marshal.dump(hash))
+      h = hash
+      # h = Marshal.load(Marshal.dump(hash))
 
       h[:default] = {}
 

lib/cyberarm_engine/vector.rb

@@ -95,39 +95,58 @@ module CyberarmEngine
       Vector.new(@x, @y)
     end
 
-    # Performs math operation, excluding {weight}
-    private def operator(function, other)
-      if other.is_a?(Numeric)
-        Vector.new(
-          @x.send(:"#{function}", other),
-          @y.send(:"#{function}", other),
-          @z.send(:"#{function}", other)
-        )
-      else
-        Vector.new(
-          @x.send(:"#{function}", other.x),
-          @y.send(:"#{function}", other.y),
-          @z.send(:"#{function}", other.z)
-        )
-      end
-    end
-
     # Adds Vector and Numeric or Vector and Vector, excluding {weight}
     # @return [CyberarmEngine::Vector]
     def +(other)
-      operator("+", other)
+      if other.is_a?(Numeric)
+        Vector.new(
+          @x + other,
+          @y + other,
+          @z + other
+        )
+      else
+        Vector.new(
+          @x + other.x,
+          @y + other.y,
+          @z + other.z
+        )
+      end
     end
 
     # Subtracts Vector and Numeric or Vector and Vector, excluding {weight}
     # @return [CyberarmEngine::Vector]
     def -(other)
-      operator("-", other)
+      if other.is_a?(Numeric)
+        Vector.new(
+          @x - other,
+          @y - other,
+          @z - other
+        )
+      else
+        Vector.new(
+          @x - other.x,
+          @y - other.y,
+          @z - other.z
+        )
+      end
     end
 
     # Multiplies Vector and Numeric or Vector and Vector, excluding {weight}
     # @return [CyberarmEngine::Vector]
     def *(other)
-      operator("*", other)
+      if other.is_a?(Numeric)
+        Vector.new(
+          @x * other,
+          @y * other,
+          @z * other
+        )
+      else
+        Vector.new(
+          @x * other.x,
+          @y * other.y,
+          @z * other.z
+        )
+      end
     end
 
     def multiply_transform(transform)

lib/cyberarm_engine/window.rb

@@ -6,16 +6,16 @@ module CyberarmEngine
     SAMPLES = {}
     SONGS = {}
 
-    attr_accessor :show_cursor
+    attr_accessor :show_cursor, :show_stats_plotter
     attr_writer :exit_on_opengl_error
-    attr_reader :last_frame_time, :states
+    attr_reader :last_frame_time, :delta_time, :states
 
     def self.now
       Gosu.milliseconds
     end
 
     def self.dt
-      instance.last_frame_time / 1000.0
+      instance.dt
     end
 
     def self.instance=(window)
@@ -31,32 +31,57 @@ module CyberarmEngine
     def initialize(width: 800, height: 600, fullscreen: false, update_interval: 1000.0 / 60, resizable: false, borderless: false)
       @show_cursor = false
       @has_focus = false
+      @show_stats_plotter = false
 
       super(width, height, fullscreen: fullscreen, update_interval: update_interval, resizable: resizable, borderless: borderless)
       Window.instance = self
 
       @last_frame_time = Gosu.milliseconds - 1
       @current_frame_time = Gosu.milliseconds
-      self.caption = "CyberarmEngine #{CyberarmEngine::VERSION} #{Gosu.language}"
+      @delta_time = @last_frame_time
+      self.caption = "CyberarmEngine #{CyberarmEngine::VERSION} #{Gosu.user_languages.join(', ')}"
 
       @states = []
       @exit_on_opengl_error = false
       preload_default_shaders if respond_to?(:preload_default_shaders)
+      @stats_plotter = Stats::StatsPlotter.new(2, 28) # FIXME: Make positioning easy
 
-      setup if defined?(setup)
+      setup
+    end
+
+    def setup
     end
 
     def draw
+      Stats.frame.start_timing(:draw)
+
       current_state&.draw
+      Stats.frame.start_timing(:engine_stats_renderer)
+      @stats_plotter&.draw if @show_stats_plotter
+      Stats.frame.end_timing(:engine_stats_renderer)
+
+      Stats.frame.end_timing(:draw)
+      Stats.frame.start_timing(:interframe_sleep)
     end
 
     def update
-      Stats.clear
+      # Gosu calls update() then (optionally) draw(),
+      # so always end last frame and start next frame when update() is called.
+      Stats.frame&.end_timing(:interframe_sleep)
+      Stats.end_frame
 
-      current_state&.update
+      Stats.new_frame
+
+      @delta_time = (Gosu.milliseconds - @current_frame_time) * 0.001
 
       @last_frame_time = Gosu.milliseconds - @current_frame_time
       @current_frame_time = Gosu.milliseconds
+
+      Stats.frame.start_timing(:update)
+      current_state&.update
+      Stats.frame.end_timing(:update)
+
+      Stats.frame.start_timing(:interframe_sleep) unless needs_redraw?
     end
 
     def needs_cursor?
@@ -120,7 +145,7 @@ module CyberarmEngine
     def push_state(klass, options = {})
       options = { setup: true }.merge(options)
 
-      if klass.instance_of?(klass.class) && defined?(klass.options)
+      if klass.instance_of?(klass.class) && klass.respond_to?(:options)
         @states << klass
         klass.setup if options[:setup]
         klass.post_setup if options[:setup]
@@ -133,6 +158,8 @@ module CyberarmEngine
     end
 
     private def child_of?(input, klass)
+      return false unless input
+
       input.ancestors.detect { |c| c == klass }
     end
 

mrbgem.rake

@@ -0,0 +1,29 @@
+MRuby::Gem::Specification.new("mruby-cyberarm_engine") do |spec|
+  spec.license = "MIT"
+  spec.authors = "cyberarm"
+  spec.summary = " Yet another framework for building games with Gosu"
+
+  lib_rbfiles = []
+  # Dir.glob("#{File.expand_path("..", __FILE__)}/lib/**/*.rb").reject do |f|
+    # File.basename(f.downcase, ".rb") == "cyberarm_engine" ||
+    # File.basename(f.downcase, ".rb") == "opengl" ||
+    # f.downcase.include?("/opengl/")
+  # end.reverse!
+
+  local_path = File.expand_path("..", __FILE__)
+  File.read("#{local_path}/lib/cyberarm_engine.rb").each_line do |line|
+    line = line.strip
+
+    next unless line.start_with?("require_relative")
+
+    file = line.split("require_relative").last.strip.gsub("\"", "")
+
+    next if file.include?(" if ")
+
+    lib_rbfiles << "#{local_path}/lib/#{file}.rb"
+  end
+
+  pp lib_rbfiles
+
+  spec.rbfiles = lib_rbfiles
+end