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webgl.js
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window.onload = function () {
const gl = document.getElementById("canvas").getContext("webgl");
const m4 = twgl.m4;
const programInfo = twgl.createProgramInfo(gl, ["vs", "fs"]);
const programInfoScreen = twgl.createProgramInfo(gl, ["vsScreen", "fsScreen"]);
var geometry = {position:[],indices:{numComponents:2,data:[]},seed:{numComponents:4,data:[]}};
var cubeCount = 100;
var crossCount = 100;
var circleCount = 100;
var glassCount = 100;
var circleSegment = 16;
for (var index = 0; index < cubeCount; ++index) {
var indices = [0,1,1,3,3,2,2,0,4,5,5,7,7,6,6,4,0,4,1,5,2,6,3,7];
var rnd = [Math.random()*2-1,Math.random()*2-1,Math.random()*2-1];
var positions = [-1,-1,-1,1,-1,-1,-1,1,-1,1,1,-1,-1,-1,1,1,-1,1,-1,1,1,1,1,1];
for (var i = 0; i < positions.length; ++i) positions[i] *= .75;
for (var i = 0; i < indices.length; ++i) indices[i] += index*8;
var seed = []; for (var i = 0; i < 8; ++i) seed.push(rnd[0],rnd[1],rnd[2],index/(cubeCount-1));
geometry.position = geometry.position.concat(positions);
geometry.indices.data = geometry.indices.data.concat(indices);
geometry.seed.data = geometry.seed.data.concat(seed);
}
for (var index = 0; index < crossCount; ++index) {
var indices = [0,1,2,3,4,5];
var rnd = [Math.random()*2-1,Math.random()*2-1,Math.random()*2-1];
for (var i = 0; i < indices.length; ++i) indices[i] += cubeCount*8+index*6;
var seed = []; for (var i = 0; i < 6; ++i) seed.push(rnd[0],rnd[1],rnd[2],index/(crossCount-1));
geometry.position = geometry.position.concat([0,1,0,0,-1,0,1,0,0,-1,0,0,0,0,1,0,0,-1]);
geometry.indices.data = geometry.indices.data.concat(indices);
geometry.seed.data = geometry.seed.data.concat(seed);
}
for (var index = 0; index < circleCount; ++index) {
var indices = []; for (var i = 0; i < circleSegment; ++i) indices.push(i,(i+1)%circleSegment);
var rnd = [Math.random()*2-1,Math.random()*2-1,Math.random()*2-1];
for (var i = 0; i < indices.length; ++i) indices[i] += cubeCount*8+crossCount*6+index*circleSegment;
var seed = []; for (var i = 0; i < circleSegment; ++i) seed.push(rnd[0],rnd[1],rnd[2],index/(circleCount-1));
var positions = []; for (var i = 0; i < circleSegment; ++i) { var a=Math.PI*2*i/(circleSegment); positions.push(Math.cos(a), 0, Math.sin(a)); }
geometry.position = geometry.position.concat(positions);
geometry.indices.data = geometry.indices.data.concat(indices);
geometry.seed.data = geometry.seed.data.concat(seed);
}
var glassPositions = [0.022434,1.034322,0.369725,1.274269,0.818479,0.343764,0.217788,0.998567,0.264331,1.277470,0.806091,-0.211158,0.130684,1.017387,0.456790,1.163883,0.839821,0.482480,1.209406,-0.057186,0.067695,1.210905,-0.062987,-0.192141,1.172286,-0.544278,0.053184,1.146209,-0.887103,0.036436,1.175422,-0.525794,-0.177321,1.159415,-0.691772,0.266868,1.142818,-0.908468,0.271610,1.253900,0.552546,0.349583,1.084868,0.849338,0.275155,1.087386,0.843868,0.020675,0.267663,0.990989,0.315775,1.028363,0.860069,0.325271,0.220031,0.993145,0.009848,1.035702,0.851660,-0.035737,0.270846,0.983296,-0.045284,1.155316,-0.778556,-0.071931,1.147349,-0.843719,0.327511,1.163112,-0.654264,0.155922,1.142615,-0.921865,0.161759,1.153814,-0.759320,0.325664,1.162575,-0.688844,-0.125800,1.145010,-0.876879,0.301346,1.161194,-0.673650,0.214210,1.143766,-0.912920,0.099286,1.150019,-0.842341,-0.015515,1.166385,-0.617593,0.092922,1.142389,-0.919175,0.219583,1.156604,-0.725518,0.298034,1.150554,-0.801557,0.329910,-0.045190,1.045960,0.368881,-1.296983,1.259408,0.311697,-0.238641,1.077121,0.258633,-1.289013,1.249399,-0.243225,-0.154950,1.066546,0.453224,-1.188375,1.244658,0.453117,-0.010064,1.036966,0.220281,-0.006119,1.027432,-0.227192,-1.399862,0.388975,0.030677,-1.396130,0.384288,-0.229159,-1.459467,-0.095789,0.013395,-1.501306,-0.436947,-0.005304,-1.453252,-0.076426,-0.216976,-1.481246,-0.243490,0.226211,-1.507954,-0.459196,0.229718,-1.329761,0.994689,0.316002,-1.105722,1.226351,0.247810,-1.103753,1.220976,-0.006677,-0.289413,1.086865,0.308821,-1.050112,1.217785,0.299325,-0.236398,1.071699,0.004150,-1.051086,1.210808,-0.061786,-0.286229,1.079172,-0.052238,-1.486114,-0.328453,-0.113039,-1.500955,-0.394983,0.285981,-1.474739,-0.205692,0.115493,-1.507722,-0.472071,0.119806,-1.490552,-0.310968,0.284615,-1.474169,-0.238933,-0.166390,-1.504582,-0.427879,0.259631,-1.478119,-0.225231,0.173663,-1.505554,-0.462907,0.057391,-1.494917,-0.392177,-0.056993,-1.469155,-0.168928,0.052710,-1.508380,-0.469636,0.177637,-1.485926,-0.277209,0.257181,-1.495815,-0.353027,0.288620];
var glassIndices = [15,16,2,4,6,2,1,5,42,1,4,43,14,7,27,11,11,8,28,13,29,12,30,10,7,9,5,6,8,4,2,14,17,18,18,15,3,17,21,19,16,20,20,21,19,3,31,22,32,24,33,25,34,26,35,26,22,27,23,28,24,29,25,30,10,31,9,32,13,33,12,34,23,35,52,53,37,39,41,37,36,40,42,36,39,43,51,44,64,48,48,45,65,50,66,49,67,47,44,46,40,41,45,39,37,51,54,55,55,52,38,54,58,56,53,57,57,58,56,38,68,59,69,61,70,62,71,63,72,63,59,64,60,65,61,66,62,67,47,68,46,69,50,70,49,71,60,72];
for (var index = 0; index < glassCount; ++index) {
var indices = []; indices = indices.concat(glassIndices);
var rnd = [Math.random()*2-1,Math.random()*2-1,Math.random()*2-1];
for (var i = 0; i < indices.length; ++i) indices[i] += -1+cubeCount*8+crossCount*6+circleCount*circleSegment+index*72;
var seed = []; for (var i = 0; i < glassPositions.length; ++i) seed.push(rnd[0],rnd[1],rnd[2],index/(glassCount-1));
geometry.position = geometry.position.concat(glassPositions);
geometry.indices.data = geometry.indices.data.concat(indices);
geometry.seed.data = geometry.seed.data.concat(seed);
}
const bufferInfo = twgl.createBufferInfoFromArrays(gl, geometry);
const divergence = 0.2;
var projection = m4.perspective(50 * Math.PI / 180, gl.canvas.width/gl.canvas.height, 0.01, 100.0);
const cameraLeft = m4.lookAt([-divergence, 0, 10], [0, 0, 0], [0, 1, 0]);
const cameraRight = m4.lookAt([divergence, 0, 10], [0, 0, 0], [0, 1, 0]);
var viewProjectionLeft = m4.multiply(projection, m4.inverse(cameraLeft));
var viewProjectionRight = m4.multiply(projection, m4.inverse(cameraRight));
function createTexture(segments) {
var ctx = document.createElement('canvas').getContext('2d');
ctx.canvas.width = segments[0].width || 1024;
ctx.canvas.height = segments[0].height || 1024;
var font = segments[0].font;
segments.forEach(segment => {
var options = segment || {};
var fontSize = options.fontSize || 32;
options.font = options.font || font;
ctx.font = fontSize + 'px ' + options.font;
ctx.fillStyle = options.fillStyle || 'white';
ctx.textAlign = options.textAlign || 'center';
ctx.textBaseline = options.textBaseline || 'middle';
ctx.shadowColor = options.shadowColor || 'rgba(0,0,0,.5)';
ctx.shadowBlur = options.shadowBlur || 4;
var words = options.text.split('\n');
var line = '';
var anchor = options.anchor || [.5,.5];
var x = ctx.canvas.width * anchor[0];
var y = ctx.canvas.height * anchor[1];
x += options.offsetX || 0;
y += options.offsetY || 0;
y -= Math.max(0, words.length - 1) * fontSize / 2;
for (var n = 0; n < words.length; n++) {
line = words[n];
ctx.fillText(line, x, y);
y += fontSize;
}
})
return ctx.canvas;
}
var uniforms = {
time: 0,
resolution: [1,1],
viewProjection: 0,
color: [1,1,1,1],
texture: twgl.createTexture(gl, createTexture([{
text: 'cookie',
font: 'Arial',
fillStyle: '#ffffff',
width: 1024,
height: 1024,
fontSize: 50,
textAlign: 'center',
textBaseline: 'middle',
}])),
};
const planeBuffer = twgl.createBufferInfoFromArrays(gl, {
position: [-1, -1, 0, 1, -1, 0, -1, 1, 0, -1, 1, 0, 1, -1, 0, 1, 1, 0],
});
// uniforms.texture = twgl.createTexture(gl, createTexture([{
// text: 'cookie',
// font: 'Arial',
// fillStyle: '#ffffff',
// width: 1024,
// height: 1024,
// fontSize: 50,
// textAlign: 'center',
// textBaseline: 'middle',
// }]));
console.log(uniforms.texture)
function render(elapsed) {
elapsed /= 1000;
uniforms.time = elapsed;
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
gl.clearColor(0,0,0,1);
gl.clear(gl.COLOR_BUFFER_BIT|gl.DEPTH_BUFFER_BIT);
gl.useProgram(programInfo.program);
twgl.setBuffersAndAttributes(gl, programInfo, bufferInfo);
uniforms.color = [1,0,0,1];
uniforms.viewProjection = viewProjectionLeft;
twgl.setUniforms(programInfo, uniforms);
twgl.drawBufferInfo(gl, bufferInfo, gl.LINES);
uniforms.color = [0,1,1,1];
uniforms.viewProjection = viewProjectionRight;
twgl.setUniforms(programInfo, uniforms);
twgl.drawBufferInfo(gl, bufferInfo, gl.LINES);
requestAnimationFrame(render);
}
function onWindowResize() {
twgl.resizeCanvasToDisplaySize(gl.canvas);
uniforms.resolution = [gl.canvas.width, gl.canvas.height];
projection = m4.perspective(50 * Math.PI / 180, gl.canvas.width/gl.canvas.height, 0.01, 100.0);
viewProjectionLeft = m4.multiply(projection, m4.inverse(cameraLeft));
viewProjectionRight = m4.multiply(projection, m4.inverse(cameraRight));
}
onWindowResize();
window.addEventListener('resize', onWindowResize, false);
requestAnimationFrame(render);
}