Entity Component System - a different approach to game and app development
0 likes742 views
The document discusses the Entity Component System (ECS) as an alternative approach to game and application development, contrasting it with Object-Oriented Programming (OOP) and Functional Programming (FP). It highlights the advantages of ECS in managing state and complex interactions through components and systems, emphasizing principles like single responsibility and testability. The document also references notable figures and resources in the field, encouraging further exploration of ECS implementations.
![public class AreaCalculator
{
public double Area(Rectangle[] shapes)
{
double area = 0;
foreach (var shape in shapes)
{
area += shape.Width*shape.Height;
}
return area;
}
}](https://image.slidesharecdn.com/ecsmaximzaks-181001123546/85/Entity-Component-System-a-different-approach-to-game-and-app-development-5-320.jpg)
![public double Area(object[] shapes)
{
double area = 0;
foreach (var shape in shapes)
{
if (shape is Rectangle)
{
Rectangle rectangle = (Rectangle) shape;
area += rectangle.Width*rectangle.Height;
}
else
{
Circle circle = (Circle)shape;
area += circle.Radius * circle.Radius * Math.PI;
}
}
return area;
}](https://image.slidesharecdn.com/ecsmaximzaks-181001123546/85/Entity-Component-System-a-different-approach-to-game-and-app-development-6-320.jpg)
![public double Area(Shape[] shapes)
{
double area = 0;
foreach (var shape in shapes)
{
area += shape.Area();
}
return area;
}](https://image.slidesharecdn.com/ecsmaximzaks-181001123546/85/Entity-Component-System-a-different-approach-to-game-and-app-development-9-320.jpg)
![data Shape = Circle Float | Rectangle Float Float
area :: Shape -> Float
area (Circle r) = pi * r * r
area (Rectangle width height) = width * height
sum $ map area [(Circle 5), (Rectangle 2 3), (Circle 7)]](https://image.slidesharecdn.com/ecsmaximzaks-181001123546/85/Entity-Component-System-a-different-approach-to-game-and-app-development-15-320.jpg)
Entity Component System - a different approach to game and app development
- 1. Entity Component System - a different approach to game / application development Maxim Zaks @iceX33
- 2. Object Oriented Programming SOLID Principals
- 4. public class Rectangle { public double Width { get; set; } public double Height { get; set; } }
- 5. public class AreaCalculator { public double Area(Rectangle[] shapes) { double area = 0; foreach (var shape in shapes) { area += shape.Width*shape.Height; } return area; } }
- 6. public double Area(object[] shapes) { double area = 0; foreach (var shape in shapes) { if (shape is Rectangle) { Rectangle rectangle = (Rectangle) shape; area += rectangle.Width*rectangle.Height; } else { Circle circle = (Circle)shape; area += circle.Radius * circle.Radius * Math.PI; } } return area; }
- 7. public abstract class Shape { public abstract double Area(); }
- 8. public class Rectangle : Shape { public double Width { get; set; } public double Height { get; set; } public override double Area() { return Width*Height; } } public class Circle : Shape { public double Radius { get; set; } public override double Area() { return Radius*Radius*Math.PI; } }
- 9. public double Area(Shape[] shapes) { double area = 0; foreach (var shape in shapes) { area += shape.Area(); } return area; }
- 11. Wassily Kandinsky: Komposition VIII, 1923. Öl auf Leinwand
- 14. rectangleArea :: Float -> Float -> Float rectangleArea a b = a * b
- 15. data Shape = Circle Float | Rectangle Float Float area :: Shape -> Float area (Circle r) = pi * r * r area (Rectangle width height) = width * height sum $ map area [(Circle 5), (Rectangle 2 3), (Circle 7)]
- 16. FP -> Function Composition
- 19. struct RadiusComponent { float value; } struct HeightComponent { float value; } struct WidthComponent { float value; } struct AreaComponent { float value; }
- 20. Compute Circle Area System • get all entities which have RadiusComponent • set computed AreaComponent on this entity
- 22. Compute Rectangle Area System • get all entities which have WidthComponent and HeightComponent • set computed AreaComponent on entity
- 24. Compute Sum of Areas System • get all entities which have AreaComponent • compute a sum of values • do something with it
- 25. Systems query for data / get data injected
- 26. Systems don't return They change sate, or perform side effects
- 28. Systems don't care about the whole picture
- 30. Elephant and the blind men https://en.wikipedia.org/wiki/Blindmenandanelephant
- 31. Interactive vs. pure computation
- 32. Systems are executed periodically
- 33. How to implement an early exit?
- 34. Define better query • get all entities which have RadiusComponent and don't have AreaComponent
- 35. What happens when value is changed by outside interaction?
- 36. Solutions • Introduce special components for outside interactions • Use an ECS which supports reactive systems
- 37. What is a reactive system?
- 38. Component events • Added • Removed • Replaced
- 40. ECS vs. FP • ECS is built for interactive computations • mutation is ok • side effects are ok
- 41. ECS vs. OOP
- 42. Data driven vs. Abstraction
- 43. Clean architecture • SOLID in regards to ECS
- 49. Lets talk about testability
- 50. Lets talk about debug-ability
- 51. Lets talk about performance
- 53. If you want to know more • Have a look at work Unity3D does https://unity3d.com/unity/ features/job-system-ECS • Mike Acton @ CppCon 2014 https://www.youtube.com/watch? v=rX0ItVEVjHc • Catherine West @ Rust Conf 2018 https://www.youtube.com/ watch?v=aKLntZcp27M • ECS Lab Discord Server https://discord.gg/eCpyZSg
- 54. Thank you! Maxim Zaks @iceX33 Questions?