kiln

Kiln is a highly opinionated 2D game engine. Some of these opinions are good. The main goal of this is rapid prototyping of game ideas with minimal friction, without reliance on closed-source solutions (e.g. Unity3D) while also enabling the build and distribution of games without reliance on antiquated technology (e.g. Stencyl's reliance on Flash).

Goals

Short-term

OpenGL rendering
Windows, Linux, and Mac support (via JVM)
Minimal or no global state
Understandable syntax
Use functional programming where appropriate
Design with testability in mind

Long-term

Native targets
3D support
iOS and Android support

Non-goals

Efficiency at the cost of ease of use
Strict adherence to functional programming paradigms
100% code coverage

Why Kotlin?

Static typing
Simple syntax
Lambdas and other functional programming niceties
Implicit null checking by default
Runs on the JVM, which runs everywhere
Evolving support for native and JavaScript targets
No semicolons

Target syntax

This is an evolving target, but the hope is that something like the below would work.

class Game: KilnGame {
  val sprite = KilnSprite(16, 16)

  fun update() {
    sprite.position.x += 1
    sprite.position.y += 1

    if (sprite.position.x > screen.bounds.x) {
      sprite.position.x = 0
    }

    if (sprite.position.y > screen.bounds.y) {
      sprite.position.y = 0
    }
  }
}

fun main() {
  val game = Game(640, 480)
  game.start()
}

steverichey/kiln