From 6a2996ceae968029be26ed7ebae8785dcfe877d2 Mon Sep 17 00:00:00 2001
From: realtradam <mr.malczewski@gmail.com>
Date: Fri, 14 May 2021 05:48:50 -0400
Subject: added ECS system

---
 app/ECS/base_component.rb               | 17 +++++++++
 app/ECS/component_manager.rb            | 20 +++++++++++
 app/ECS/components/00_test_component.rb | 16 +++++++++
 app/ECS/components/01_based.rb          | 16 +++++++++
 app/ECS/entity_manager.rb               | 61 +++++++++++++++++++++++++++++++++
 app/ECS/system_manager.rb               |  6 ++++
 app/ECS/systems/00_movement.rb          | 22 ++++++++++++
 app/ECS/systems/01_flying.rb            | 17 +++++++++
 app/ECS/test.rb                         | 18 ++++++++++
 sprites/non-free                        |  2 +-
 10 files changed, 194 insertions(+), 1 deletion(-)
 create mode 100644 app/ECS/base_component.rb
 create mode 100644 app/ECS/component_manager.rb
 create mode 100644 app/ECS/components/00_test_component.rb
 create mode 100644 app/ECS/components/01_based.rb
 create mode 100644 app/ECS/entity_manager.rb
 create mode 100644 app/ECS/system_manager.rb
 create mode 100644 app/ECS/systems/00_movement.rb
 create mode 100644 app/ECS/systems/01_flying.rb
 create mode 100644 app/ECS/test.rb

diff --git a/app/ECS/base_component.rb b/app/ECS/base_component.rb
new file mode 100644
index 0000000..a40ef52
--- /dev/null
+++ b/app/ECS/base_component.rb
@@ -0,0 +1,17 @@
+class ECS
+  class BaseComponent
+    class <<self
+      def data
+        @data ||= {}
+      end
+
+      def add(entity_id, **args)
+        data[entity_id] = new(**args)
+      end
+
+      def delete(entity_id)
+        data.delete entity_id
+      end
+    end
+  end
+end
diff --git a/app/ECS/component_manager.rb b/app/ECS/component_manager.rb
new file mode 100644
index 0000000..e64bc21
--- /dev/null
+++ b/app/ECS/component_manager.rb
@@ -0,0 +1,20 @@
+require_relative './base_component'
+Dir[File.join(__dir__, 'components', '*.rb')].sort.each { |file| require file }
+
+class ECS
+  class Components
+    class <<self
+      def entity_destroyed(entity_id)
+        constants.each do |component|
+          component.delete(entity_id) unless (component.id & ECS::Entity.signatures[entity_id]).zero?
+        end
+      end
+
+      def entity_created(entity_id)
+        constants.each do |component|
+          const_get(component.to_s).add(entity_id) unless (const_get(component.to_s).id & ECS::Entity.signatures[entity_id]).zero?
+        end
+      end
+    end
+  end
+end
diff --git a/app/ECS/components/00_test_component.rb b/app/ECS/components/00_test_component.rb
new file mode 100644
index 0000000..0906fc8
--- /dev/null
+++ b/app/ECS/components/00_test_component.rb
@@ -0,0 +1,16 @@
+class ECS
+  class Components
+    class TestComponent < ECS::BaseComponent
+      def self.id
+        @id = '0001'.to_i(2)
+      end
+
+      attr_accessor :x, :y
+
+      def initialize(x: 0, y: 0)
+        @x = x
+        @y = y
+      end
+    end
+  end
+end
diff --git a/app/ECS/components/01_based.rb b/app/ECS/components/01_based.rb
new file mode 100644
index 0000000..fe564ca
--- /dev/null
+++ b/app/ECS/components/01_based.rb
@@ -0,0 +1,16 @@
+class ECS
+  class Components
+    class Based < ECS::BaseComponent
+      def self.id
+        @id = '0010'.to_i(2)
+      end
+
+      attr_accessor :x, :y
+
+      def initialize(x: 0, y:0)
+        @x = x
+        @y = y
+      end
+    end
+  end
+end
diff --git a/app/ECS/entity_manager.rb b/app/ECS/entity_manager.rb
new file mode 100644
index 0000000..06f73cd
--- /dev/null
+++ b/app/ECS/entity_manager.rb
@@ -0,0 +1,61 @@
+class ECS
+  class Entity
+    attr_accessor :id
+
+    def initialize(signature = 0)
+      @id = ECS::Entity.generate_new_id
+      self.class.all.push self
+      self.class.signatures.push signature
+      ECS::Components.entity_created(@id)
+    end
+
+    class <<self
+      # All entities that exist
+      def all
+        @all ||= []
+      end
+
+      def id_queue
+        @id_queue ||= []
+      end
+
+      def generate_new_id
+        if id_queue.empty?
+          all.size
+        else
+          id_queue.shift
+        end
+      end
+
+      # What components a given entity uses
+      def signatures
+        @signatures ||= []
+      end
+
+      def destroy_entity(entity_id)
+        if all[entity_id].nil?
+          puts 'Entity can not be destroyed, id out of bounds'
+        elsif entity_id < all.size - 1
+          ECS::Components.constants.each do |constant|
+            unless (signatures[entity_id] & ECS::Components::const_get(constant).id).zero?
+              ECS::Components::const_get(constant).delete(entity_id)
+            end
+          end
+          all[entity_id] = nil
+          signatures[entity_id] = nil
+          id_queue.push entity_id
+        elsif entity_id == all.size - 1
+          ECS::Components.constants.each do |constant|
+            unless (signatures[entity_id] & ECS::Components::const_get(constant).id).zero?
+              ECS::Components::const_get(constant).delete(entity_id)
+            end
+          end
+          all.pop
+          signatures.pop
+        else
+          puts 'Unknown error with destroy_entity, entity not destroyed'
+        end
+      end
+    end
+  end
+end
diff --git a/app/ECS/system_manager.rb b/app/ECS/system_manager.rb
new file mode 100644
index 0000000..53aa46b
--- /dev/null
+++ b/app/ECS/system_manager.rb
@@ -0,0 +1,6 @@
+Dir[File.join(__dir__, 'systems', '*.rb')].sort.each { |file| require file }
+
+class ECS
+  class Systems
+  end
+end
diff --git a/app/ECS/systems/00_movement.rb b/app/ECS/systems/00_movement.rb
new file mode 100644
index 0000000..ced0343
--- /dev/null
+++ b/app/ECS/systems/00_movement.rb
@@ -0,0 +1,22 @@
+class ECS
+  class Systems
+    class Movement
+      def self.run
+        ECS::Components::TestComponent.data.each do |key, data|
+          puts "Entity ID: #{key}"
+          unless (ECS::Components::Based.id - ECS::Entity.signatures[key]).zero?
+            unless (ECS::Components::Based.id & ECS::Entity.signatures[key]).zero?
+              puts "Based Data: "
+              puts "eks: #{ECS::Components::Based.data[key].x += 2}"
+              puts "why: #{ECS::Components::Based.data[key].y += 2}"
+            end
+          end
+          puts "Movement:"
+          puts "x: #{data.x += 1}"
+          puts "y: #{data.y += 1}"
+          puts "---"
+        end
+      end
+    end
+  end
+end
diff --git a/app/ECS/systems/01_flying.rb b/app/ECS/systems/01_flying.rb
new file mode 100644
index 0000000..493e999
--- /dev/null
+++ b/app/ECS/systems/01_flying.rb
@@ -0,0 +1,17 @@
+class ECS
+  class Systems
+    class Based
+      def self.run
+        ECS::Components::Based.data.each do |key, data|
+          if ECS::Components::Based.id == ECS::Entity.signatures[key]
+            puts "Entity ID: #{key}"
+            puts "ONLY Based Data: "
+            puts "eks: #{ECS::Components::Based.data[key].x += 3}"
+            puts "why: #{ECS::Components::Based.data[key].y += 3}"
+            puts "---"
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/app/ECS/test.rb b/app/ECS/test.rb
new file mode 100644
index 0000000..2ab5be1
--- /dev/null
+++ b/app/ECS/test.rb
@@ -0,0 +1,18 @@
+require_relative './entity_manager.rb'
+require_relative './component_manager.rb'
+require_relative './system_manager.rb'
+
+move = '0001'.to_i(2)
+base = '0010'.to_i(2)
+both = '0011'.to_i(2)
+ECS::Entity.new(move)
+ECS::Entity.new(base)
+ECS::Entity.new(both)
+
+3.times do
+  ECS::Systems.constants.each do |constant|
+    puts "|----#{constant.to_s.upcase}----|"
+    ECS::Systems::const_get(constant).run
+  end
+  #ECS::Entity.destroy_entity(ECS::Entity.all.last.id) unless ECS::Entity.all.empty?
+end
diff --git a/sprites/non-free b/sprites/non-free
index c267467..93a45d7 160000
--- a/sprites/non-free
+++ b/sprites/non-free
@@ -1 +1 @@
-Subproject commit c267467bc90f06bc770962a5000c02680daa8f91
+Subproject commit 93a45d7807376400c7d6a46f2516df2b1ea33346
-- 
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