mirror of
https://github.com/greggman/twgl.js.git
synced 2025-12-08 19:26:07 +00:00
129 lines
3.7 KiB
HTML
129 lines
3.7 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<head>
|
|
<meta charset="utf8">
|
|
<!--
|
|
|
|
@license twgl.js Copyright (c) 2015, Gregg Tavares All Rights Reserved.
|
|
Available via the MIT license.
|
|
see: http://github.com/greggman/twgl.js for details
|
|
|
|
-->
|
|
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
|
|
<meta property="og:title" content="TWGL.js - mat4-attribute" />
|
|
<meta property="og:type" content="website" />
|
|
<meta property="og:image" content="http://twgljs.org/examples/screenshots/mat4-attribute.png" />
|
|
<meta property="og:description" content="TWGL.js - mat4-attribute" />
|
|
<meta property="og:url" content="http://twgljs.org" />
|
|
|
|
<meta name="twitter:card" content="summary_large_image">
|
|
<meta name="twitter:site" content="@greggman">
|
|
<meta name="twitter:creator" content="@greggman">
|
|
<meta name="twitter:domain" content="twgljs.org">
|
|
<meta name="twitter:title" content="TWGL.js - mat4-attribute">
|
|
<meta name="twitter:url" content="http://twgljs.org/examples/mat4-attribute.html">
|
|
<meta name="twitter:description" content="TWGL.js - mat4-attribute">
|
|
<meta name="twitter:image:src" content="http://twgljs.org/examples/screenshots/mat4-attribute.png">
|
|
|
|
<link href="/resources/images/twgljs-icon.png" rel="shortcut icon" type="image/png">
|
|
|
|
<title>twgl.js - mat4-attribute</title>
|
|
<style>
|
|
* {
|
|
box-sizing: border-box;
|
|
-moz-box-sizing: border-box;
|
|
}
|
|
html, body {
|
|
margin: 0;
|
|
font-family: monospace;
|
|
height: 100%;
|
|
}
|
|
canvas {
|
|
display: block;
|
|
width: 100%;
|
|
height: 100%;
|
|
}
|
|
#b {
|
|
position: absolute;
|
|
top: 10px;
|
|
width: 100%;
|
|
text-align: center;
|
|
z-index: 2;
|
|
}
|
|
</style>
|
|
</head>
|
|
<body>
|
|
<canvas id="c"></canvas>
|
|
<div id="b"><a href="http://twgljs.org">twgl.js</a> - mat4-attribute</div>
|
|
</body>
|
|
<script id="vs" type="notjs">
|
|
attribute mat4 a_matrix;
|
|
attribute vec4 a_color;
|
|
|
|
uniform mat4 u_matrix;
|
|
varying vec4 v_color;
|
|
|
|
void main() {
|
|
gl_PointSize = 10.0;
|
|
gl_Position = u_matrix * a_matrix * vec4(0, 0, 0, 1);
|
|
v_color = a_color;
|
|
}
|
|
</script>
|
|
<script id="fs" type="notjs">
|
|
precision mediump float;
|
|
|
|
varying vec4 v_color;
|
|
|
|
void main() {
|
|
gl_FragColor = v_color;
|
|
}
|
|
</script>
|
|
<script type="module">
|
|
import * as twgl from '../dist/7.x/twgl-full.module.js';
|
|
twgl.setDefaults({attribPrefix: "a_"});
|
|
const m4 = twgl.m4;
|
|
const gl = document.querySelector("#c").getContext("webgl");
|
|
const programInfo = twgl.createProgramInfo(gl, ["vs", "fs"]);
|
|
|
|
function r(min, max) {
|
|
if (max === undefined) {
|
|
max = min;
|
|
min = 0;
|
|
}
|
|
return Math.random() * (max - min) + min;
|
|
}
|
|
|
|
const numPoints = 1000;
|
|
const matrices = [];
|
|
const colors = [];
|
|
for (let ii = 0; ii < numPoints; ++ii) {
|
|
matrices.push.apply(matrices, m4.translation([r(-.7, .7), r(-.7, .7), r(-.7, .7)]));
|
|
colors.push(r(1), r(1), r(1), 1);
|
|
}
|
|
|
|
// matrix gets applyied to 4 consecutive attributes
|
|
const bufferInfo = twgl.createBufferInfoFromArrays(gl, {
|
|
matrix: { numComponents: 16, data: matrices },
|
|
color: colors,
|
|
});
|
|
|
|
function render(time) {
|
|
time *= 0.001;
|
|
|
|
twgl.resizeCanvasToDisplaySize(gl.canvas);
|
|
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
|
|
|
|
gl.useProgram(programInfo.program);
|
|
twgl.setBuffersAndAttributes(gl, programInfo, bufferInfo);
|
|
twgl.setUniforms(programInfo, {
|
|
u_matrix: m4.rotateZ(m4.rotateY(m4.rotationX(time), time * 0.37), time * 0.13),
|
|
});
|
|
twgl.drawBufferInfo(gl, bufferInfo, gl.POINTS);
|
|
|
|
requestAnimationFrame(render);
|
|
}
|
|
requestAnimationFrame(render);
|
|
</script>
|
|
</html>
|
|
|