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gldemo.html
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gldemo.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<script src="math32.js"></script>
<script src="shadercompiler.js"></script>
<script src="imageloader.js"></script>
<script src="sounds.js"></script>
<script src="canvasmanager.js"></script>
<script src="dynamicvao.js"></script>
<script src="scene.js"></script>
<script src="engine.js"></script>
</head>
<body>
<h1>David Bowie Fanfiction: WebGL</h1>
<div id="canvas-container" style="height:80vh; width:100%"></div>
<script id="shader-background-v" type="x-shader/x-vertex">
attribute vec2 vertex;
varying vec2 world_coord;
uniform mat3 inverse_view;
void main() {
gl_Position = vec4(vertex,0.0,1.0);
world_coord = (inverse_view * vec3(vertex,1.0)).xy;
}
</script>
<script id="shader-background-f" type="x-shader/x-fragment">
precision highp float;
varying vec2 world_coord;
uniform float t;
void main() {
float x = dot(world_coord,vec2(0.7,0.3));
float y = dot(world_coord,vec2(0.71,1.3));
float z = dot(world_coord,vec2(-31.0,41.0));
gl_FragColor = vec4(0.8+sin(t*2.0+y)*0.1, 0.8+sin(t*4.0+z)*0.025, 0.8+sin(t+x)*0.3, 1.0);
}
</script>
<script>
/*
* A custom render pass that uses the custom shaders
*/
class BackgroundPass extends RenderPass {
constructor(gl,scene,program) {
super(gl,program);
this.vao = new SimpleVAO(gl,program,scene.square_vao);
this.inverse_view_loc = gl.getUniformLocation(program,"inverse_view");
this.t_loc = gl.getUniformLocation(program,"t");
this.inverse_view = new Mat();
this.t = 0;
}
update(scene,dt) {
Mat.Inv(this.inverse_view,scene.view);
this.t += dt;
}
draw(gl) {
gl.useProgram(this.program);
gl.uniformMatrix3fv(this.inverse_view_loc,false,this.inverse_view.a);
gl.uniform1f(this.t_loc,this.t);
this.vao.draw(gl);
}
}
class DemoEngine extends Engine {
setup() {
// Background pass
this.backgroundpass = new BackgroundPass(this.gl,
this.scene,
this.sc.programs.get('background')
);
this.scene.addPass(this.backgroundpass,1.0);
// Make some sprites
/*this.sprites = new Set();
for (const [name,tex_frame] of this.il.model_frames) {
const s = new Sprite(this,name);
s.angle = Math.PI * 2 * Math.random();
s.scale = 0.5 + 0.5*Math.random();
s.pos = new Vec(Math.random()*2-1, Math.random()*2-1);
s.mirror = Math.random() > 0.5;
}*/
new Robot(this);
}
update(dt) {
super.update(dt);
this.scene.view.a[0] = 1/this.cm.aspectRatio;
}
}
class Robot extends Sprite {
constructor(engine) {
super(engine,"BlueBot/bluebot1.png");
this.frames = [
"BlueBot/bluebot1.png",
"BlueBot/bluebot2.png",
"BlueBot/bluebot3.png",
"BlueBot/bluebot4.png",
"BlueBot/bluebot3.png",
"BlueBot/bluebot2.png",
];
this.frame = 0;
this.frame_age = 0;
this.engine.cm.canvas.addEventListener('click',
(e) => {
const mouse_pos = new Vec(this.engine.cm.mouse_x,this.engine.cm.mouse_y);
const velocity = this.engine.mouse_pos.sub(this.pos).normeq().muleq(3);
new Wave(this.engine,this.pos,velocity);
}
);
}
tick(dt) {
let moving = false;
if (this.engine.cm.isPressed("KeyA")) {
this.pos.addeq(new Vec(-0.1,0.0));
this.mirror = false;
moving = true;
}
if (this.engine.cm.isPressed("KeyD")) {
this.pos.addeq(new Vec(0.1,0.0));
this.mirror = true;
moving = true;
}
this.setImage(this.frames[this.frame]);
this.frame_age += dt;
if ((moving || this.frame !== 0) && this.frame_age > 0.1) {
this.frame = (this.frame + 1) % this.frames.length;
this.frame_age = 0;
}
}
}
class Wave extends Sprite {
constructor(engine,pos,vel) {
super(engine,"BlueBot/bluebot1.png");
this.pos.eq(pos);
this.vel = vel;
this.frames = [
"OrangeWave/1.png",
"OrangeWave/2.png",
"OrangeWave/3.png",
"OrangeWave/4.png",
"OrangeWave/3.png",
"OrangeWave/2.png",
];
this.angle = Math.atan2(vel.a[0],vel.a[1]);
this.frame = 0;
this.frame_age = 0;
}
tick(dt) {
if (this.pos.a[1]>1){
this.vel.a[1] = -this.vel.a[1];
}
if (this.pos.a[1]<-1){
this.vel.a[1] = -this.vel.a[1];
}//handles y array
if (this.pos.a[0]>1){
this.vel.a[0] = -this.vel.a[0];
}
if (this.pos.a[0]<-1){
this.vel.a[0] = -this.vel.a[0];
}//handles x array
this.pos.addeq(this.vel.mul(dt));
this.setImage(this.frames[this.frame]);
this.frame_age += dt;
if (this.frame_age > 0.1) {
this.frame = (this.frame + 1) % this.frames.length;
this.frame_age = 0;
}
}
}
const engine = new DemoEngine(
canvas_container = document.getElementById("canvas-container"),
shader_programs = {
background:['shader-background-v','shader-background-f']
},
images = {
spritesheet:'images/hoverbots.png'
},
frames = {
spritesheet:'images/hoverbots.json'
},
music = {
"negentropy": "sound/Chad_Crouch_-_Negentropy.mp3"
},
sfx = {
"hit": "sound/hit.mp3"
},
);
console.log(engine);
</script>
</div>
</body>
</html>