380 lines
9.1 KiB
TypeScript
380 lines
9.1 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} from './buffers';
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import {initShaderProgram} from './shaders';
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import {changeFragmentShader} from './changeshader';
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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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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 aVertexColor;
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attribute vec4 aVertexNormal;
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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 vColor;
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varying highp vec4 vNormal;
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varying highp vec3 vPosition;
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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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vColor = aVertexColor;
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vNormal = umodelMatrix * aVertexNormal;
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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 vColor;
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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(-500., 1000., 500.) - vPosition);
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float diffuse = max(dot(vNormal.xyz, n), 0.);
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float specular = pow(
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max(dot(
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reflect(n, 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(100.), vec3(3.)), 3.);
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float texture = (tmp.x + tmp.y + tmp.z) / 9.;
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if (abs(vNormal.x) + abs(vNormal.y) + abs(vNormal.z) > 0.01) {
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gl_FragColor = vec4((texture * diffuse * 0.9) + (texture * vec3(0.1)) + (specular * vec3(1.)), 1.0);
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} else {
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gl_FragColor = vec4((texture * vec3(1.)), 1.0);
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}
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}`;
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const fsSource2 = `
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precision highp float;
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varying highp vec4 vColor;
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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(-500., 1000., 500.) - vPosition);
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float diffuse = max(dot(vNormal.xyz, n), 0.);
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float specular = pow(
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max(dot(
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reflect(n, 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(100.), vec3(3.)), 3.);
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vec3 texture = vec3(tmp.x / 3., tmp.y / 3., tmp.z / 3.);
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if (abs(vNormal.x) + abs(vNormal.y) + abs(vNormal.z) > 0.01) {
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gl_FragColor = vec4((texture * diffuse * 0.9) + (texture * vec3(0.1)) + (specular * vec3(1.)), 1.0);
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} else {
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gl_FragColor = vec4((texture * vec3(1.)), 1.0);
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}
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}`;
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/* eslint-enable */
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fetch('/static/objs/teapot_normals.obj').then((response) => {
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return response.text();
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}).then((data: any) => {
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let distance: any = $('#input1').val();
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distance = parseFloat(distance);
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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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console.log(uvs);
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let [shaderProgram, fragmentShader]: any = initShaderProgram(gl,
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vsSource,
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fsSource);
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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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vertexColor: gl.getAttribLocation(shaderProgram,
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'aVertexColor'),
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vertexNormal: gl.getAttribLocation(shaderProgram,
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'aVertexNormal'),
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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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},
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};
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const buffers = initBuffers(gl, positions, indices, normals);
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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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indices.length,
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distance);
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requestAnimationFrame(render);
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}
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$(function() {
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$('#input1').on('keypress', function(event: any) {
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if (event.which === 13) {
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event.preventDefault();
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$('#button3').click();
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}
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});
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$('#button1').on('click', function() {
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[programInfo, fragmentShader] = changeFragmentShader(gl,
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shaderProgram, fragmentShader, fsSource, vsSource);
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});
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$('#button2').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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$('#button3').on('click', function() {
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distance = $('#input1').val();
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distance = parseFloat(distance);
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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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/**
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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} distance distance of camera
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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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distance: number) {
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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 = 45 * 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 = 150.0;
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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(
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viewMatrix,
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viewMatrix,
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[Math.cos(squareRotation) * 5, Math.sin(squareRotation) * 5, 0]);
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mat4.translate(
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viewMatrix,
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viewMatrix,
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[0.0, 0.0, -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.position);
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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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// 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.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 positions from the position
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// buffer into the vertexPosition attribute.
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{
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const numComponents = 4;
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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.color);
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gl.vertexAttribPointer(
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programInfo.attribLocations.vertexColor,
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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.vertexColor);
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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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{
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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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