mirror of
https://github.com/greggman/twgl.js.git
synced 2025-12-08 19:26:07 +00:00
202 lines
7.8 KiB
HTML
202 lines
7.8 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf8">
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<title>twgl.js - webgl cube</title>
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<style>
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body {
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margin: 0;
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font-family: monospace;
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}
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canvas {
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display: block;
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width: 100vw;
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height: 100vh;
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}
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#b {
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position: absolute;
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top: 10px;
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width: 100%;
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text-align: center;
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z-index: 2;
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}
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</style>
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</head>
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<body>
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<canvas id="c"></canvas>
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<div id="b"><a href="http://twgljs.org">twgl.js</a> - webgl-cube</div>
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</body>
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<script id="vs" type="notjs">
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uniform mat4 u_worldViewProjection;
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uniform vec3 u_lightWorldPos;
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uniform mat4 u_world;
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uniform mat4 u_viewInverse;
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uniform mat4 u_worldInverseTranspose;
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attribute vec4 a_position;
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attribute vec3 a_normal;
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attribute vec2 a_texcoord;
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varying vec4 v_position;
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varying vec2 v_texCoord;
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varying vec3 v_normal;
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varying vec3 v_surfaceToLight;
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varying vec3 v_surfaceToView;
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void main() {
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v_texCoord = a_texcoord;
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v_position = (u_worldViewProjection * a_position);
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v_normal = (u_worldInverseTranspose * vec4(a_normal, 0)).xyz;
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v_surfaceToLight = u_lightWorldPos - (u_world * a_position).xyz;
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v_surfaceToView = (u_viewInverse[3] - (u_world * a_position)).xyz;
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gl_Position = v_position;
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}
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</script>
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<script id="fs" type="notjs">
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precision mediump float;
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varying vec4 v_position;
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varying vec2 v_texCoord;
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varying vec3 v_normal;
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varying vec3 v_surfaceToLight;
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varying vec3 v_surfaceToView;
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uniform vec4 u_lightColor;
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uniform vec4 u_ambient;
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uniform sampler2D u_diffuse;
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uniform vec4 u_specular;
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uniform float u_shininess;
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uniform float u_specularFactor;
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vec4 lit(float l ,float h, float m) {
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return vec4(1.0,
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max(l, 0.0),
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(l > 0.0) ? pow(max(0.0, h), m) : 0.0,
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1.0);
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}
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void main() {
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vec4 diffuseColor = texture2D(u_diffuse, v_texCoord);
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vec3 a_normal = normalize(v_normal);
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vec3 surfaceToLight = normalize(v_surfaceToLight);
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vec3 surfaceToView = normalize(v_surfaceToView);
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vec3 halfVector = normalize(surfaceToLight + surfaceToView);
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vec4 litR = lit(dot(a_normal, surfaceToLight),
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dot(a_normal, halfVector), u_shininess);
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vec4 outColor = vec4((
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u_lightColor * (diffuseColor * litR.y + diffuseColor * u_ambient +
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u_specular * litR.z * u_specularFactor)).rgb,
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diffuseColor.a);
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gl_FragColor = outColor;
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}
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</script>
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<script src="../dist/4.x/twgl-full.min.js"></script>
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<script>
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"use strict";
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twgl.setDefaults({attribPrefix: "a_"});
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const m4 = twgl.m4;
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const gl = document.querySelector("#c").getContext("webgl");
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const program = twgl.createProgramFromScripts(gl, ["vs", "fs"]);
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const u_lightWorldPosLoc = gl.getUniformLocation(program, "u_lightWorldPos");
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const u_lightColorLoc = gl.getUniformLocation(program, "u_lightColor");
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const u_ambientLoc = gl.getUniformLocation(program, "u_ambient");
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const u_specularLoc = gl.getUniformLocation(program, "u_specular");
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const u_shininessLoc = gl.getUniformLocation(program, "u_shininess");
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const u_specularFactorLoc = gl.getUniformLocation(program, "u_specularFactor");
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const u_diffuseLoc = gl.getUniformLocation(program, "u_diffuse");
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const u_worldLoc = gl.getUniformLocation(program, "u_world");
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const u_worldInverseTransposeLoc = gl.getUniformLocation(program, "u_worldInverseTranspose");
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const u_worldViewProjectionLoc = gl.getUniformLocation(program, "u_worldViewProjection");
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const u_viewInverseLoc = gl.getUniformLocation(program, "u_viewInverse");
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const positionLoc = gl.getAttribLocation(program, "a_position");
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const normalLoc = gl.getAttribLocation(program, "a_normal");
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const texcoordLoc = gl.getAttribLocation(program, "a_texcoord");
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const 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, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1];
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const normals = [1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1];
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const texcoords = [1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1];
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const indices = [0, 1, 2, 0, 2, 3, 4, 5, 6, 4, 6, 7, 8, 9, 10, 8, 10, 11, 12, 13, 14, 12, 14, 15, 16, 17, 18, 16, 18, 19, 20, 21, 22, 20, 22, 23];
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const positionBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
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gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(positions), gl.STATIC_DRAW);
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const normalBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, normalBuffer);
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gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(normals), gl.STATIC_DRAW);
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const texcoordBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ARRAY_BUFFER, texcoordBuffer);
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gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(texcoords), gl.STATIC_DRAW);
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const indicesBuffer = gl.createBuffer();
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indicesBuffer);
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gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(indices), gl.STATIC_DRAW);
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const tex = gl.createTexture();
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gl.bindTexture(gl.TEXTURE_2D, tex);
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gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 2, 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array([
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255, 255, 255, 255,
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192, 192, 192, 255,
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192, 192, 192, 255,
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255, 255, 255, 255,
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]));
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
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gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
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function render(time) {
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time *= 0.001;
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twgl.resizeCanvasToDisplaySize(gl.canvas);
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gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
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gl.enable(gl.DEPTH_TEST);
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gl.enable(gl.CULL_FACE);
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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const projection = m4.perspective(30 * Math.PI / 180, gl.canvas.clientWidth / gl.canvas.clientHeight, 0.5, 10);
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const eye = [1, 4, -6];
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const target = [0, 0, 0];
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const up = [0, 1, 0];
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const camera = m4.lookAt(eye, target, up);
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const view = m4.inverse(camera);
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const viewProjection = m4.multiply(projection, view);
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const world = m4.rotationY(time);
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gl.useProgram(program);
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gl.uniform3fv(u_lightWorldPosLoc, [1, 8, -10]);
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gl.uniform4fv(u_lightColorLoc, [1, 0.8, 0.8, 1]);
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gl.uniform4fv(u_ambientLoc, [0, 0, 0, 1]);
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gl.uniform4fv(u_specularLoc, [1, 1, 1, 1]);
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gl.uniform1f(u_shininessLoc, 50);
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gl.uniform1f(u_specularFactorLoc, 1);
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gl.uniform1i(u_diffuseLoc, 0);
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gl.uniformMatrix4fv(u_viewInverseLoc, false, camera);
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gl.uniformMatrix4fv(u_worldLoc, false, world);
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gl.uniformMatrix4fv(u_worldInverseTransposeLoc, false, m4.transpose(m4.inverse(world)));
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gl.uniformMatrix4fv(u_worldViewProjectionLoc, false, m4.multiply(viewProjection, world));
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gl.activeTexture(gl.TEXTURE0);
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gl.bindTexture(gl.TEXTURE_2D, tex);
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gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
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gl.vertexAttribPointer(positionLoc, 3, gl.FLOAT, false, 0, 0);
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gl.enableVertexAttribArray(positionLoc);
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gl.bindBuffer(gl.ARRAY_BUFFER, normalBuffer);
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gl.vertexAttribPointer(normalLoc, 3, gl.FLOAT, false, 0, 0);
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gl.enableVertexAttribArray(normalLoc);
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gl.bindBuffer(gl.ARRAY_BUFFER, texcoordBuffer);
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gl.vertexAttribPointer(texcoordLoc, 2, gl.FLOAT, false, 0, 0);
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gl.enableVertexAttribArray(texcoordLoc);
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gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indicesBuffer);
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gl.drawElements(gl.TRIANGLES, 6 * 6, gl.UNSIGNED_SHORT, 0);
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requestAnimationFrame(render);
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}
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requestAnimationFrame(render);
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</script>
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</html>
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