fizzicks/fizzicks.html at master · lexmart/fizzicks · GitHub

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<!DOCTYPE html>

<style>
body {
	padding: 0;
	margin: 0;
	overflow: hidden;
}
.container {
	position:relative;
}
#text {
	position:absolute;
	left:0px;
	top:0px;
	z-index:999;
}
</style>

<div class="container">
	<canvas id="main"></canvas>
	<canvas id="text"></canvas>
</div>

<script id="line-vs" type="x-shader/x-vertex">

attribute vec2 pos;

uniform mat4 projFromWorld;
uniform mat4 worldFromLocal;

void main(void) {
  	gl_Position = projFromWorld*worldFromLocal*vec4(pos, 0.0, 1.0);
}

</script>

<script id="line-fs" type="x-shader/x-fragment">

void main(void) {
  gl_FragColor = vec4(1.0, 1.0, 1.0, 1.0);
}

</script>

<script>
	var canvas = document.querySelector("#main")
	var textCanvas = document.querySelector("#text")

	canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
	textCanvas.width = window.innerWidth;
    textCanvas.height = window.innerHeight;

	var gl = canvas.getContext("webgl") || canvas.getContext("experimental-webgl")
	var ctx = textCanvas.getContext("2d");

	var vs = gl.createShader(gl.VERTEX_SHADER)
	gl.shaderSource(vs, document.querySelector("#line-vs").textContent)
	gl.compileShader(vs)
	if(!gl.getShaderParameter(vs, gl.COMPILE_STATUS)) throw new Error(gl.getShaderInfoLog(vs))

	var fs = gl.createShader(gl.FRAGMENT_SHADER)
	gl.shaderSource(fs, document.querySelector("#line-fs").textContent)
	gl.compileShader(fs)
	if(!gl.getShaderParameter(fs, gl.COMPILE_STATUS)) throw new Error(gl.getShaderInfoLog(fs))

	var program = gl.createProgram()
	gl.attachShader(program, vs)
	gl.attachShader(program, fs)
	gl.linkProgram(program)
	if(!gl.getProgramParameter(program, gl.LINK_STATUS)) throw new Error(gl.getProgramInfoLog(program))
	gl.useProgram(program)

	var camP = {
		x: 0,
		y: 0
	}
	var w = canvas.width
	var h = canvas.height
	var ppm = canvas.width/25
	var projFromWorld = new Float32Array([
		ppm/w, 	0.0, 	0.0, 	0.0,
		0.0, 	ppm/h, 	0.0, 	0.0,
		0.0, 	0.0, 	1.0, 	0.0,
		-ppm*camP.x/w, 	-ppm*camP.y/h, 	0.0, 	1.0
	])
	var projFromWorldLoc = gl.getUniformLocation(program, "projFromWorld")
	var worldFromLocalLoc = gl.getUniformLocation(program, "worldFromLocal")
	gl.uniformMatrix4fv(projFromWorldLoc, false, projFromWorld)

	var worldFromLocal = new Float32Array([
		1.0, 	0.0, 	0.0, 	0.0,
		0.0, 	1.0, 	0.0, 	0.0,
		0.0, 	0.0, 	1.0, 	0.0,
		0.0, 	0.0, 	0.0, 	1.0
	])


	var lineBuffer = gl.createBuffer()
	gl.bindBuffer(gl.ARRAY_BUFFER, lineBuffer)
	gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
		-0.5,	-0.5,	0.5,	-0.5,
		0.5,	-0.5,	0.5, 	0.5,
		0.5, 	0.5, 	-0.5,	0.5,
		-0.5, 	0.5, 	-0.5,	-0.5
	]), gl.STATIC_DRAW);

	var pos = gl.getAttribLocation(program, "pos")
	gl.enableVertexAttribArray(pos)
	gl.vertexAttribPointer(pos, 2, gl.FLOAT, false, 0, 0)

	function drawBox(x, y, boxw, boxh, xx, xy, yx, yy) {
		worldFromLocal[0] = boxw*xx
		worldFromLocal[1] = boxw*xy
		worldFromLocal[4] = -boxh*yx
		worldFromLocal[5] = -boxh*yy
		worldFromLocal[12] = x;
		worldFromLocal[13] = y;
		gl.uniformMatrix4fv(worldFromLocalLoc, false, worldFromLocal)
		gl.drawArrays(gl.LINES, 0, 8)
	}

	async function init() {
		var t = 0.0;

		var env = {}
		env.drawBox = drawBox
		env.cosf = Math.cos
		env.sinf = Math.sin
		env.sqrtf = Math.sqrtf


		//const {instance} = await WebAssembly.instantiateStreaming(
			//fetch("./fizzicks.wasm"), { env: env}
		//)

		var dt = 1.0/60.0

		async function wa() {
			const response = await(fetch('/fizzicks.wasm'))
			const buffer = await response.arrayBuffer()
			const obj = await WebAssembly.instantiate(buffer, { env: env })

			addEventListener('mousedown', (event) => { obj.instance.exports.keydown() });
			addEventListener('keydown', (event) => {
				if(event.keyCode == 32) {
					console.log("party time")
					obj.instance.exports.setPartyTime(1.0)
				}
			})

			setInterval(() => {
				gl.clearColor(0, 0, 0, 1)
				gl.clear(gl.COLOR_BUFFER_BIT)
				obj.instance.exports.fizzicks(dt)
				ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
				ctx.fillStyle = 'white';
				ctx.font = "40px Arial";
				ctx.fillText('github.com/lexmart/fizzicks', 50, 50)
				ctx.font = "20px Arial";
				ctx.fillText('Left click to shoot', 50, 80)
				ctx.fillText('Click space to party', 50, 110)
			}, dt);
		}

		wa()
	}

	init();

</script>