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main.js
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main.js
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/*! MTW-CANVAS-DISKS: MAIN.JS
*
* Author: sitdisch
* Source: https://sitdisch.github.io/#mythemeway
* License: MIT
* Copyright: © 2021 sitdisch
*
* FRAGMENT SHADER IS BASED ON:
*
* Shadertoy: CoordSys - intersection
*
* Original Author: Inigo Quilez
* Source: https://www.shadertoy.com/view/lsfGDB
* License: MIT
* Copyright: © 2013 Inigo Quilez
* Changes: made
*/
"use strict";
import { createProgramInfo, createBufferInfoFromArrays, resizeCanvasToDisplaySize, setBuffersAndAttributes, setUniforms, drawBufferInfo } from 'twgl.js';
import { GLSLX_SOURCE_FRAGMENT_SHADER, GLSLX_SOURCE_VERTEX_SHADER, GLSLX_NAME_I_TIME, GLSLX_NAME_I_RESOLUTION, GLSLX_NAME_POSITION } from './shaders.glslx.min.js';
(() => {
const gl = document.getElementById("header-canvas").getContext("webgl");
resizeCanvasToDisplaySize(gl.canvas);
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
// FIX: adding "\n" is a workaround for twgl.js error:'no element with id:...'
const vs = "\n"+GLSLX_SOURCE_VERTEX_SHADER;
const fs = "\n#ifdef GL_FRAGMENT_PRECISION_HIGH\nprecision highp float;\n#else\nprecision mediump float;\n#endif\n"+GLSLX_SOURCE_FRAGMENT_SHADER;
const programInfo = createProgramInfo(gl, [vs, fs]);
gl.useProgram(programInfo.program);
const arrays = {
[GLSLX_NAME_POSITION]: [-1, -1, 0, 1, -1, 0, -1, 1, 0, -1, 1, 0, 1, -1, 0, 1, 1, 0],
};
const bufferInfo = createBufferInfoFromArrays(gl, arrays);
setBuffersAndAttributes(gl, programInfo, bufferInfo);
const uniforms = {
[GLSLX_NAME_I_RESOLUTION]: [gl.canvas.width, gl.canvas.height, 1],
[GLSLX_NAME_I_TIME]: 0,
};
const randomStart = Math.floor(Math.random() * 100);
function render() {
uniforms[GLSLX_NAME_I_TIME] = randomStart + performance.now() / 4500;
setUniforms(programInfo, uniforms);
drawBufferInfo(gl, bufferInfo);
};
const canvasOvershadow = document.getElementById("header-canvas-overshadow");
const headerEnd = document.getElementById("header-end").offsetTop;
var overshadow = true;
window.setInterval(() => {
if ( headerEnd > window.pageYOffset ) {
requestAnimationFrame(render);
if ( overshadow ) {
canvasOvershadow.style.display="none";
overshadow = false;
}
} else if ( !(overshadow) ) {
canvasOvershadow.style.display="inline";
overshadow = true;
}
}, 100);
})();