540 lines
13 KiB
TypeScript
540 lines
13 KiB
TypeScript
// @ts-ignore
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import mat4 from 'gl-mat4';
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// @ts-ignore
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import {convert} from './objparser';
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import $ from 'jquery';
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import {initBuffers, deleteBuffers} from './buffers';
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import {initShaderProgram} from './shaders';
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import {changeFragmentShader} from './changeshader';
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import {loadTexture} from './texture';
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let squareRotation = 0.0;
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main();
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/**
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* The program purpose is encapsulated in a main function
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*/
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async function main() {
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const canvas: any = document.querySelector('#glCanvas')!;
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const gl = canvas.getContext('webgl');
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if (gl == null) {
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canvas.parentNode.removeChild(canvas);
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document.getElementById('root')!.insertAdjacentHTML('beforeend',
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`<p>Unable to initialize WebGL. Your browser or machine may not
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support it.</p>`);
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}
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/* eslint-disable */
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const vsSource = `
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attribute vec4 aVertexPosition;
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attribute vec4 aVertexNormal;
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attribute vec2 aTextureCoord;
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uniform mat4 uProjectionMatrix;
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uniform mat4 uviewMatrix;
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uniform mat4 umodelMatrix;
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varying highp vec4 vNormal;
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varying highp vec3 vPosition;
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varying highp vec2 vTextureCoord;
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void main()
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{
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gl_Position = uProjectionMatrix *
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uviewMatrix *
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umodelMatrix *
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aVertexPosition;
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vPosition = vec3(aVertexPosition);
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vNormal = umodelMatrix * aVertexNormal;
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vTextureCoord = aTextureCoord;
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}
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`;
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const fsSource = `
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precision highp float;
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varying highp vec4 vNormal;
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varying highp vec3 vPosition;
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vec3 extremize(vec3 v, float n) {
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if (v.x > n / 2.)
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v.x = n;
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else
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v.x = 0.;
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if (v.y > n / 2.)
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v.y = n;
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else
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v.y = 0.;
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if (v.z > n / 2.)
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v.z = n;
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else
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v.z = 0.;
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return v;
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}
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void main() {
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vec3 n = normalize(vec3(-50000., 100000., 50000.) - vPosition);
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float diffuse = max(dot(normalize(vNormal.xyz), n), 0.);
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float specular = pow(
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max(dot(
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reflect(n, normalize(vNormal.xyz)),
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normalize(vec3(0., 0., -50.) - vPosition)),
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0.), 10.);
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vec3 tmp = extremize(mod(vPosition.xyz + vec3(1000.), vec3(2.)), 2.);
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float texture = (tmp.x + tmp.y + tmp.z) / 6.;
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gl_FragColor = vec4((texture * diffuse * 0.8) + (texture * vec3(0.2)) + (specular * vec3(1.)), 1.0);
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}`;
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const fsSource2 = `
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precision highp float;
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varying highp vec4 vNormal;
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varying highp vec3 vPosition;
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vec3 extremize(vec3 v, float n) {
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if (v.x > n / 2.)
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v.x = n;
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else
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v.x = 0.;
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if (v.y > n / 2.)
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v.y = n;
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else
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v.y = 0.;
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if (v.z > n / 2.)
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v.z = n;
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else
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v.z = 0.;
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return v;
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}
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void main() {
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vec3 n = normalize(vec3(-50000., 100000., 50000.) - vPosition);
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float diffuse = max(dot(normalize(vNormal.xyz), n), 0.);
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float specular = pow(
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max(dot(
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reflect(n, normalize(vNormal.xyz)),
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normalize(vec3(0., 0., -50.) - vPosition)),
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0.), 10.);
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vec3 texture = extremize(mod(vPosition.xyz + vec3(1000.), vec3(2.)), 2.) / vec3(2);
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gl_FragColor = vec4((texture * diffuse * 0.8) + (texture * vec3(0.2)) + (specular * vec3(1.)), 1.0);
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}`;
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const fsSource3 = `
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precision highp float;
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varying highp vec4 vNormal;
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varying highp vec3 vPosition;
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vec3 extremize(vec3 v, float n) {
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if (v.x > n / 2.)
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v.x = n;
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else
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v.x = 0.;
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if (v.y > n / 2.)
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v.y = n;
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else
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v.y = 0.;
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if (v.z > n / 2.)
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v.z = n;
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else
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v.z = 0.;
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return v;
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}
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void main() {
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vec3 n = normalize(vec3(-50000., 100000., 50000.) - vPosition);
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float diffuse = max(dot(normalize(vNormal.xyz), n), 0.);
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float specular = pow(
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max(dot(
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reflect(n, normalize(vNormal.xyz)),
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normalize(vec3(0., 0., -50.) - vPosition)),
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0.), 10.);
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vec3 texture = extremize(mod(vPosition.xyz + vec3(1000.), vec3(2.)), 2.) / vec3(2);
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gl_FragColor = vec4((diffuse * 0.8) + (vec3(0.2)) + (specular * vec3(1.)), 1.0);
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}`;
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const fsSource4 = `
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precision highp float;
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varying highp vec2 vTextureCoord;
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varying highp vec4 vNormal;
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varying highp vec3 vPosition;
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uniform sampler2D uSampler;
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void main() {
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highp vec4 texelColor = texture2D(uSampler, vTextureCoord);
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vec3 n = normalize(vec3(-50000., 100000., 50000.) - vPosition);
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float diffuse = max(dot(normalize(vNormal.xyz), n), 0.);
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float specular = pow(
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max(dot(
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reflect(n, normalize(vNormal.xyz)),
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normalize(vec3(0., 0., -50.) - vPosition)),
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0.), 10.);
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gl_FragColor = vec4((texelColor.xyz * diffuse * 0.8) + (texelColor.xyz * vec3(0.2)) + (specular * vec3(1.)), 1.0);
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}`;
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/* eslint-enable */
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/**
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* Fetch an obj file
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* @param {string} url the url to fetch the object from
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* @return {string} the raw data of the obj file
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*/
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async function getObj(url: string) {
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const response = await fetch(url);
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const data = await response.text();
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return data;
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}
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const data = await getObj('/static/objs/fox.obj');
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const params: any = {
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distance: $('#distance').val(),
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circleSize: $('#circlesize').val(),
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fov: $('#fov').val(),
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avg: {
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x: 0,
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y: 0,
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z: 0,
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},
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};
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const [
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positions,
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normals,
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uvs,
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indices,
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] = convert(data);
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let x = 0;
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let y = 0;
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let z = 0;
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for (let i = 0; i < positions.length; i++) {
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if (i % 3 == 0) {
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x += positions[i];
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} else if (i % 3 == 1) {
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y += positions[i];
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} else {
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z += positions[i];
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}
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}
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params.avg.x = x / (positions.length / 3);
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params.avg.y = y / (positions.length / 3);
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params.avg.z = z / (positions.length / 3);
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let length = indices.length;
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let [shaderProgram, fragmentShader]: any = initShaderProgram(gl,
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vsSource,
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fsSource4);
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let programInfo: any = {
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program: shaderProgram,
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attribLocations: {
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vertexPosition: gl.getAttribLocation(shaderProgram,
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'aVertexPosition'),
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vertexNormal: gl.getAttribLocation(shaderProgram,
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'aVertexNormal'),
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textureCoord: gl.getAttribLocation(shaderProgram,
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'aTextureCoord'),
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},
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uniformLocations: {
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projectionMatrix: gl.getUniformLocation(
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shaderProgram, 'uProjectionMatrix'),
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viewMatrix: gl.getUniformLocation(
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shaderProgram, 'uviewMatrix'),
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modelMatrix: gl.getUniformLocation(
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shaderProgram, 'umodelMatrix'),
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uSampler: gl.getUniformLocation(
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shaderProgram, 'uSampler'),
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},
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};
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let texture = loadTexture(gl, '/static/textures/fox.png');
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let buffers = initBuffers(gl, positions, indices, normals, uvs);
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let then = 0;
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let changed = false;
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/**
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* Draws the scene repeatedly
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* @param {number} now the current time
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*/
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function render(now: any) {
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now *= 0.001;
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const deltaTime = now - then;
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if (now >= 1 && changed == false) {
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changed = true;
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}
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then = now;
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drawScene(gl,
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programInfo,
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buffers,
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deltaTime,
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length,
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params,
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texture);
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requestAnimationFrame(render);
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}
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/**
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* Pushes a new obj file to the gl buffer
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* @param {string} data the obj file to push
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*/
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function updateObj(data: string) {
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const [
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positions,
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normals,
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uvs,
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indices,
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] = convert(data);
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length = indices.length;
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let x = 0;
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let y = 0;
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let z = 0;
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for (let i = 0; i < positions.length; i++) {
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if (i % 3 == 0) {
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x += positions[i];
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} else if (i % 3 == 1) {
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y += positions[i];
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} else {
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z += positions[i];
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}
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}
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params.avg.x = x / (positions.length / 3);
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params.avg.y = y / (positions.length / 3);
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params.avg.z = z / (positions.length / 3);
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deleteBuffers(gl, buffers);
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buffers = initBuffers(gl, positions, indices, normals, uvs);
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}
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$(function() {
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$('#distance').on('input', function() {
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const distance: any = $('#distance').val();
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params.distance = parseFloat(distance);
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});
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$('#circlesize').on('input', function() {
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const circleSize: any = $('#circlesize').val();
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params.circleSize = parseFloat(circleSize);
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});
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$('#fov').on('input', function() {
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const fov: any = $('#fov').val();
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params.fov = parseFloat(fov);
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});
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$('#s_blackandwhite').on('click', function() {
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[programInfo, fragmentShader] = changeFragmentShader(gl,
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shaderProgram, fragmentShader, fsSource, vsSource);
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});
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$('#s_color').on('click', function() {
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[programInfo, fragmentShader] = changeFragmentShader(gl,
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shaderProgram, fragmentShader, fsSource2, vsSource);
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});
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$('#s_flat').on('click', function() {
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[programInfo, fragmentShader] = changeFragmentShader(gl,
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shaderProgram, fragmentShader, fsSource3, vsSource);
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});
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$('#s_texture').on('click', function() {
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[programInfo, fragmentShader] = changeFragmentShader(gl,
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shaderProgram, fragmentShader, fsSource4, vsSource);
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});
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$('#o_sphere').on('click', async function() {
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const data = await getObj('/static/objs/sphere.obj');
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updateObj(data);
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});
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$('#o_teapot').on('click', async function() {
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const data = await getObj('/static/objs/teapot.obj');
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updateObj(data);
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});
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$('#o_fox').on('click', async function() {
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const data = await getObj('/static/objs/fox.obj');
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updateObj(data);
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});
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$('#t_wall').on('click', async function() {
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texture = loadTexture(gl, '/static/textures/wall.png');
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});
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$('#t_ice').on('click', async function() {
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texture = loadTexture(gl, '/static/textures/ice.png');
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});
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$('#t_noise').on('click', async function() {
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texture = loadTexture(gl, '/static/textures/noise.png');
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});
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$('#t_fox').on('click', async function() {
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texture = loadTexture(gl, '/static/textures/fox.png');
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});
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});
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requestAnimationFrame(render);
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}
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/**
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* Draw a webgl scene
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* @param {any} gl the WebGL context
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* @param {any} programInfo WebGL program information
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* @param {any} buffers the buffers to draw
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* @param {number} deltaTime the difference in time since last call
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* @param {number} length the index buffer length
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* @param {number} params various parameterss
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* @param {any} texture the texture to load
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*/
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function drawScene(gl: any,
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programInfo: any,
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buffers: any,
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deltaTime: number,
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length: number,
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params: any,
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texture: any) {
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gl.clearColor(0.0, 0.0, 0.0, 1.0);
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gl.clearDepth(1.0);
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gl.enable(gl.DEPTH_TEST);
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gl.depthFunc(gl.LEQUAL);
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// Clear the canvas before we start drawing on it.
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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// Create a perspective matrix, a special matrix that is
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// used to simulate the distortion of perspective in a camera.
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// Our field of view is 45 degrees, with a width/height
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// ratio that matches the display size of the canvas
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// and we only want to see objects between 0.1 units
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// and 100 units away from the camera.
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const fieldOfView = params.fov * Math.PI / 180;
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const aspect = gl.canvas.clientWidth / gl.canvas.clientHeight;
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const zNear = 0.1;
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const zFar = 1000.0;
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const projectionMatrix = mat4.create();
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// note: glmatrix.js always has the first argument
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// as the destination to receive the result.
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mat4.perspective(
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projectionMatrix,
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fieldOfView,
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aspect,
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zNear,
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zFar);
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const modelMatrix = mat4.create();
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mat4.rotate(modelMatrix,
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modelMatrix,
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squareRotation,
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[
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0,
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1,
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0,
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]);
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// Set the drawing position to the "identity" point, which is
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// the center of the scene.
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const viewMatrix = mat4.create();
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mat4.translate(viewMatrix,
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viewMatrix,
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[
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-params.avg.x,
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-params.avg.y,
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-params.avg.z,
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]);
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mat4.translate(
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viewMatrix,
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viewMatrix, [
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Math.cos(squareRotation) * params.circleSize,
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Math.sin(squareRotation) * params.circleSize,
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0,
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]);
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mat4.translate(
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viewMatrix,
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viewMatrix,
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[0.0, 0.0, -params.distance]);
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// Tell WebGL how to pull out the positions from the position
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// buffer into the vertexPosition attribute.
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{
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const numComponents = 3;
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const type = gl.FLOAT;
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const normalize = false;
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const stride = 0;
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const offset = 0;
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gl.bindBuffer(gl.ARRAY_BUFFER, buffers.positions);
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gl.vertexAttribPointer(
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programInfo.attribLocations.vertexPosition,
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numComponents,
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type,
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normalize,
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stride,
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offset);
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gl.enableVertexAttribArray(
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programInfo.attribLocations.vertexPosition);
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}
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{
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const numComponents = 3;
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const type = gl.FLOAT;
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const normalize = false;
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const stride = 0;
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const offset = 0;
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gl.bindBuffer(gl.ARRAY_BUFFER, buffers.normals);
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gl.vertexAttribPointer(
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programInfo.attribLocations.vertexNormal,
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numComponents,
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type,
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normalize,
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stride,
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offset);
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gl.enableVertexAttribArray(
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programInfo.attribLocations.vertexNormal);
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}
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// tell webgl how to pull out the texture coordinates from buffer
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{
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const num = 2; // every coordinate composed of 2 values
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const type = gl.FLOAT; // the data in the buffer is 32 bit float
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const normalize = false; // don't normalize
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const stride = 0; // how many bytes to get from one set to the next
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const offset = 0; // how many bytes inside the buffer to start from
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gl.bindBuffer(gl.ARRAY_BUFFER, buffers.uvs);
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gl.vertexAttribPointer(programInfo.attribLocations.textureCoord,
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num,
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type,
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normalize,
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stride,
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offset);
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gl.enableVertexAttribArray(programInfo.attribLocations.textureCoord);
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}
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// Tell WebGL which indices to use to index the vertices
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffers.indices);
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// Tell WebGL to use our program when drawing
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gl.useProgram(programInfo.program);
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// Set the shader uniforms
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gl.uniformMatrix4fv(
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programInfo.uniformLocations.projectionMatrix,
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false,
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projectionMatrix);
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gl.uniformMatrix4fv(
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programInfo.uniformLocations.viewMatrix,
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false,
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viewMatrix);
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gl.uniformMatrix4fv(
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programInfo.uniformLocations.modelMatrix,
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false,
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modelMatrix);
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// Tell WebGL we want to affect texture unit 0
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gl.activeTexture(gl.TEXTURE0);
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// Bind the texture to texture unit 0
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gl.bindTexture(gl.TEXTURE_2D, texture);
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// Tell the shader we bound the texture to texture unit 0
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gl.uniform1i(programInfo.uniformLocations.uSampler, 0);
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{
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const vertexCount = length;
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const type = gl.UNSIGNED_SHORT;
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const offset = 0;
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gl.drawElements(gl.TRIANGLES, vertexCount, type, offset);
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}
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squareRotation += deltaTime;
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}
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