Simply prototype 2D games using an easy, minimal interface that lets you draw simple primitives and images on the screen, easily handle mouse and keyboard events, and play sounds.

Install the Go programming language. After clicking the download link you will be referred to the installation instructions for your specific operating system.

Install Git and make it available in the PATH so the Go tool can use it.

For Linux and macOS, you need a C compiler installed. On Windows this is not necessary.

The prototype framework supports multiple targets:

• Uses Direct3D 9
• No additional dependencies needed

• Uses OpenGL via GLFW
• Install required packages (example for Ubuntu/Debian):

  sudo apt install libx11-dev libxrandr-dev libgl1-mesa-dev libxcursor-dev libxinerama-dev libxi-dev

To build and run a WASM version of your game, you can use the drawsm tool. Install it with

go install github.com/gonutz/prototype/cmd/drawsm@latest

It allows you to run your game locally from within your project directory with

drawsm run

or build it into the project directory with

drawsm build

For a description of all library functions, see the package doc page. Most functionality is in the Window interface, and documented via code comments.

package main
import (
	"math"
	"github.com/gonutz/prototype/draw"
)
func main() {
	draw.RunWindow("Title", 640, 480, update)
}
func update(window draw.Window) {
	w, h := window.Size()
	centerX, centerY := w/2, h/2
	mouseX, mouseY := window.MousePosition()
	mouseInCircle := math.Hypot(float64(mouseX-centerX), float64(mouseY-centerY)) < 20
	color := draw.DarkRed
	if mouseInCircle {
		color = draw.Red
	}
	window.FillEllipse(centerX-20, centerY-20, 40, 40, color)
	window.DrawEllipse(centerX-20, centerY-20, 40, 40, draw.White)
	if mouseInCircle {
		window.DrawScaledText("Close!", centerX-40, centerY+25, 1.6, draw.Green)
	}
	for _, click := range window.Clicks() {
		dx, dy := click.X-centerX, click.Y-centerY
		if dx*dx+dy*dy <= 20*20 {
			window.Close()
		}
	}
}

This example displays a window with a round button in the middle to close it. It demonstrates basic drawing and event handling.