<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>14_镜面高光和载入JSON模型</title>
<script type="text/javascript" src="Oak3D_v_0_5.js"></script>
<script id="per-fragment-lighting-fs" type="x-shader/x-fragment">
precision mediump float;
varying vec2 vTextureCoord;
varying vec3 vTransformedNormal;
varying vec4 vPosition;
uniform float uMaterialShininess;
uniform bool uShowSpecularHighlights;
uniform bool uUseLighting;
uniform bool uUseTextures;
uniform vec3 uAmbientColor;
uniform vec3 uPointLightingLocation;
uniform vec3 uPointLightingSpecularColor;
uniform vec3 uPointLightingDiffuseColor;
uniform sampler2D uSampler;
void main(void) {
vec3 lightWeighting;
if (!uUseLighting) {
lightWeighting = vec3(1.0, 1.0, 1.0);
} else {
vec3 lightDirection = normalize(uPointLightingLocation - vPosition.xyz);
vec3 normal = normalize(vTransformedNormal);
float specularLightWeighting = 0.0;
if (uShowSpecularHighlights) {
vec3 eyeDirection = normalize(-vPosition.xyz);
vec3 reflectionDirection = reflect(-lightDirection, normal);
specularLightWeighting = pow(max(dot(reflectionDirection, eyeDirection), 0.0), uMaterialShininess);
}
float diffuseLightWeighting = max(dot(normal, lightDirection), 0.0);
lightWeighting = uAmbientColor
+ uPointLightingSpecularColor * specularLightWeighting
+ uPointLightingDiffuseColor * diffuseLightWeighting;
}
vec4 fragmentColor;
if (uUseTextures) {
fragmentColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));
} else {
fragmentColor = vec4(1.0, 1.0, 1.0, 1.0);
}
gl_FragColor = vec4(fragmentColor.rgb * lightWeighting, fragmentColor.a);
}
</script>
<script id="per-fragment-lighting-vs" type="x-shader/x-vertex">
attribute vec3 aVertexPosition;
attribute vec3 aVertexNormal;
attribute vec2 aTextureCoord;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
uniform mat4 uNMatrix;
varying vec2 vTextureCoord;
varying vec3 vTransformedNormal;
varying vec4 vPosition;
void main(void) {
vPosition = uMVMatrix * vec4(aVertexPosition, 1.0);
gl_Position = uPMatrix * vPosition;
vTextureCoord = aTextureCoord;
vTransformedNormal = (uNMatrix * vec4(aVertexNormal , 1.0)).xyz;
}
</script>
<script type="text/javascript">
var gl;
function initGL(canvas) {
try {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
} catch (e) {
}
if (!gl) {
alert("Could not initialise WebGL, sorry :-(");
}
}
function getShader(gl, id) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
var shaderProgram;
function initShaders() {
var fragmentShader = getShader(gl, "per-fragment-lighting-fs");
var vertexShader = getShader(gl, "per-fragment-lighting-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
shaderProgram.vertexNormalAttribute = gl.getAttribLocation(shaderProgram, "aVertexNormal");
gl.enableVertexAttribArray(shaderProgram.vertexNormalAttribute);
shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.nMatrixUniform = gl.getUniformLocation(shaderProgram, "uNMatrix");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
shaderProgram.materialShininessUniform = gl.getUniformLocation(shaderProgram, "uMaterialShininess");
shaderProgram.showSpecularHighlightsUniform = gl.getUniformLocation(shaderProgram, "uShowSpecularHighlights");
shaderProgram.useTexturesUniform = gl.getUniformLocation(shaderProgram, "uUseTextures");
shaderProgram.useLightingUniform = gl.getUniformLocation(shaderProgram, "uUseLighting");
shaderProgram.ambientColorUniform = gl.getUniformLocation(shaderProgram, "uAmbientColor");
shaderProgram.pointLightingLocationUniform = gl.getUniformLocation(shaderProgram, "uPointLightingLocation");
shaderProgram.pointLightingSpecularColorUniform = gl.getUniformLocation(shaderProgram, "uPointLightingSpecularColor");
shaderProgram.pointLightingDiffuseColorUniform = gl.getUniformLocation(shaderProgram, "uPointLightingDiffuseColor");
}
function handleLoadedTexture(texture) {
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.image);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST);
gl.generateMipmap(gl.TEXTURE_2D);
gl.bindTexture(gl.TEXTURE_2D, null);
}
var earthTexture;
var galvanizedTexture;
function initTextures() {
earthTexture = gl.createTexture();
earthTexture.image = new Image();
earthTexture.image.onload = function () {
handleLoadedTexture(earthTexture)
}
earthTexture.image.src = "earth.jpg";
galvanizedTexture = gl.createTexture();
galvanizedTexture.image = new Image();
galvanizedTexture.image.onload = function () {
handleLoadedTexture(galvanizedTexture)
}
galvanizedTexture.image.src = "arroway_de_metal_structure_06_d100_flat.jpg";
}
var mvMatrix;
var mvMatrixStack = [];
var pMatrix;
function mvPushMatrix() {
var copy = new okMat4();
mvMatrix.clone(copy);
mvMatrixStack.push(copy);
}
function mvPopMatrix() {
if (mvMatrixStack.length == 0) {
throw "Invalid popMatrix!";
}
mvMatrix = mvMatrixStack.pop();
}
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix.toArray());
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix.toArray());
var normalMatrix = mvMatrix.inverse().transpose();
gl.uniformMatrix4fv(shaderProgram.nMatrixUniform, false, normalMatrix.toArray());
}
function degToRad(degrees) {
return degrees * Math.PI / 180;
}
var teapotVertexPositionBuffer;
var teapotVertexNormalBuffer;
var teapotVertexTextureCoordBuffer;
var teapotVertexIndexBuffer;
function handleLoadedTeapot(teapotData) {
teapotVertexNormalBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexNormalBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(teapotData.vertexNormals), gl.STATIC_DRAW);
teapotVertexNormalBuffer.itemSize = 3;
teapotVertexNormalBuffer.numItems = teapotData.vertexNormals.length / 3;
teapotVertexTextureCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexTextureCoordBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(teapotData.vertexTextureCoords), gl.STATIC_DRAW);
teapotVertexTextureCoordBuffer.itemSize = 2;
teapotVertexTextureCoordBuffer.numItems = teapotData.vertexTextureCoords.length / 2;
teapotVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexPositionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(teapotData.vertexPositions), gl.STATIC_DRAW);
teapotVertexPositionBuffer.itemSize = 3;
teapotVertexPositionBuffer.numItems = teapotData.vertexPositions.length / 3;
teapotVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, teapotVertexIndexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(teapotData.indices), gl.STATIC_DRAW);
teapotVertexIndexBuffer.itemSize = 1;
teapotVertexIndexBuffer.numItems = teapotData.indices.length;
document.getElementById("loadingtext").textContent = "";
}
function loadTeapot() {
var request = new XMLHttpRequest();
request.open("GET", "Teapot.json");
request.onreadystatechange = function () {
if (request.readyState == 4) {
handleLoadedTeapot(JSON.parse(request.responseText));
}
}
request.send();
}
var teapotAngle = 180;
function drawScene() {
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
if (teapotVertexPositionBuffer == null || teapotVertexNormalBuffer == null || teapotVertexTextureCoordBuffer == null || teapotVertexIndexBuffer == null) {
return;
}
pMatrix = okMat4Proj(45, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0);
var specularHighlights = document.getElementById("specular").checked;
gl.uniform1i(shaderProgram.showSpecularHighlightsUniform, specularHighlights);
var lighting = document.getElementById("lighting").checked;
gl.uniform1i(shaderProgram.useLightingUniform, lighting);
if (lighting) {
gl.uniform3f(
shaderProgram.ambientColorUniform,
parseFloat(document.getElementById("ambientR").value),
parseFloat(document.getElementById("ambientG").value),
parseFloat(document.getElementById("ambientB").value)
);
gl.uniform3f(
shaderProgram.pointLightingLocationUniform,
parseFloat(document.getElementById("lightPositionX").value),
parseFloat(document.getElementById("lightPositionY").value),
parseFloat(document.getElementById("lightPositionZ").value)
);
gl.uniform3f(
shaderProgram.pointLightingSpecularColorUniform,
parseFloat(document.getElementById("specularR").value),
parseFloat(document.getElementById("specularG").value),
parseFloat(document.getElementById("specularB").value)
);
gl.uniform3f(
shaderProgram.pointLightingDiffuseColorUniform,
parseFloat(document.getElementById("diffuseR").value),
parseFloat(document.getElementById("diffuseG").value),
parseFloat(document.getElementById("diffuseB").value)
);
}
var texture = document.getElementById("texture").value;
gl.uniform1i(shaderProgram.useTexturesUniform, texture != "none");
mvMatrix = okMat4Trans(0, 0, -40);
mvMatrix.rot(OAK.SPACE_LOCAL, 23.4, 1, 0, -1, true);
mvMatrix.rotY(OAK.SPACE_LOCAL, teapotAngle, true);
gl.activeTexture(gl.TEXTURE0);
if (texture == "earth") {
gl.bindTexture(gl.TEXTURE_2D, earthTexture);
} else if (texture == "galvanized") {
gl.bindTexture(gl.TEXTURE_2D, galvanizedTexture);
}
gl.uniform1i(shaderProgram.samplerUniform, 0);
gl.uniform1f(shaderProgram.materialShininessUniform, parseFloat(document.getElementById("shininess").value));
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, teapotVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexTextureCoordBuffer);
gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, teapotVertexTextureCoordBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, teapotVertexNormalBuffer);
gl.vertexAttribPointer(shaderProgram.vertexNormalAttribute, teapotVertexNormalBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, teapotVertexIndexBuffer);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, teapotVertexIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
}
var lastTime = 0;
function animate() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
teapotAngle += 0.05 * elapsed;
}
lastTime = timeNow;
}
function tick() {
okRequestAnimationFrame(tick);
drawScene();
animate();
}
function webGLStart() {
var canvas = document.getElementById("lesson14-canvas");
initGL(canvas);
initShaders();
initTextures();
loadTeapot();
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.enable(gl.DEPTH_TEST);
tick();
}
</script>
<style type="text/css">
#loadingtext {
position: absolute;
top: 250px;
left: 150px;
font-size: 2em;
color: white;
}
</style>
</head>
<body onload="webGLStart();">
<canvas id="lesson14-canvas" style="border: none;" width="500" height="500"></canvas>
<div id="loadingtext">Loading world...</div>
<br />
<input type="checkbox" id="specular" checked />启用镜面高光<br />
<input type="checkbox" id="lighting" checked />启用光照<br />
纹理：
<select id="texture">
<option value="none">不使用纹理</option>
<option selected value="galvanized">电镀金属</option>
<option value="earth">地球</option>
</select>
<br />
<h2>材质：</h2>
<table style="border: 0; padding: 10px;">
<tr>
<td><b>光泽度：</b>
<td><input type="text" id="shininess" value="32.0" />
</tr>
</table>
<h2>点光源：</h2>
<table style="border: 0; padding: 10px;">
<tr>
<td><b>位置：</b>
<td>X: <input type="text" id="lightPositionX" value="-10.0" />
<td>Y: <input type="text" id="lightPositionY" value="4.0" />
<td>Z: <input type="text" id="lightPositionZ" value="-20.0" />
</tr>
<tr>
<td><b>镜面反射颜色：</b>
<td>R: <input type="text" id="specularR" value="0.8" />
<td>G: <input type="text" id="specularG" value="0.8" />
<td>B: <input type="text" id="specularB" value="0.8" />
</tr>
<tr>
<td><b>漫反射颜色：</b>
<td>R: <input type="text" id="diffuseR" value="0.8" />
<td>G: <input type="text" id="diffuseG" value="0.8" />
<td>B: <input type="text" id="diffuseB" value="0.8" />
</tr>
</table>
<h2>环境光：</h2>
<table style="border: 0; padding: 10px;">
<tr>
<td><b>颜色：</b>
<td>R: <input type="text" id="ambientR" value="0.2" />
<td>G: <input type="text" id="ambientG" value="0.2" />
<td>B: <input type="text" id="ambientB" value="0.2" />
</tr>
</table>
</body>
</html>
14、镜面高光和载入JSON模型
创建日期：2024-06-21
更新日期：2025-01-12
简介
一个来自三线小城市的程序员开发经验总结。