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exhibition_booth.html
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exhibition_booth.html
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<html>
<title>Exhibition Booth</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<style>
body {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
color: grey;
overflow: hidden;
width: auto;
height: auto;
}
canvas {
border: 0;
width: 100%;
height: 100%;
position: absolute;
display: block;
}
#title {
position: absolute;
left: 50%;
transform: translateX(-50%);
top: 5%;
}
a {
text-decoration: none;
color: blue;
}
/*
.progress-bar {
height: 24px;
width: 30%;
border: 1px solid black;
padding: 2px;
margin: 0 auto;
top: 45%;
left: 35%;
z-index: 9;
position: absolute;
text-align: center;
line-height: 60px;
}
.progress-fill {
background-color: gray;
height: 100%;
} */
</style>
<body>
<!--
<div>temporary mobile console area:<div id="tmpConsole"></div>
</div>-->
<div id="title">Exhibition Booth</div>
<!--
<div class="progress-bar">
<div class="progress-fill" style="width: 50%;"></div>
loading...
</div>
-->
<canvas id="canvas"></canvas>
<script id="vertex-shader-3d" type="x-shader/x-vertex">
uniform mat4 u_worldViewProjection;
attribute vec4 a_position;
attribute vec2 a_texcoord;
varying vec2 v_texCoord;
void main() {
v_texCoord = a_texcoord;
gl_Position = u_worldViewProjection * a_position;
}
</script>
<script id="fragment-shader-3d" type="x-shader/x-fragment">
precision highp float;
varying vec2 v_texCoord;
uniform sampler2D u_diffuse;
void main() {
vec4 diffuseColor = texture2D(u_diffuse, v_texCoord);
gl_FragColor = diffuseColor;
//gl_FragColor = vec4(1.0, 0.8, 0.0, 1.0);
}
</script>
<script id="pick-vertex-shader-3d" type="x-shader/x-vertex">
uniform mat4 u_worldViewProjection;
attribute vec4 a_position;
void main() {
gl_Position = u_worldViewProjection * a_position;
}
</script>
<script id="pick-fragment-shader-3d" type="x-shader/x-fragment">
precision lowp float;
uniform vec4 u_id;
void main() {
gl_FragColor = u_id;
//gl_FragColor = vec4(1.0, 0.8, 0.0, 1.0);
}
</script>
<script src="./webgl-utils.js"></script>
<script src="https://webglfundamentals.org/webgl/resources/m4.js"></script>
<script>
"use strict";
function main() {
//const tmpConsole = document.getElementById("tmpConsole");
let x1 = 0, x2 = 0, y1 = 0, y2 = 0, delta0, delta1;
//内容区
const loader = document.getElementsByClassName("progress-bar")[0];
const title = document.getElementById("title");
//const subtitles = ["<a href='./gallery-subscene-v2.html'>前往自动观赏模式</a>", "《秋光里的穿行》", "《通往仙境的道路》", "《西湖落日飞车》", "《镀金的西湖》", "《人在画中游》", "《西湖可以是任何一个湖》"];
//tmp
function createBtns(i) {
const button = document.createElement("button");
button.innerText = picNum - i;
button.id = picNum - i;
button.addEventListener('click', tweenRotate, false);
//btn.appendChild(button);
}
//互动区
const up = [0, 1, 0];
let aspect = window.innerWidth / window.innerHeight;
let id = -1, viewMatrix = [];
let cameraPosition = [0, 0, 40], target = [0, 0, -1000];
//let cameraPosition=[-55*aspect,5*aspect,-130], target=[-50,0,-1000];
//let newCamPosStart = [0, 0, 10], newTargetPosStart=[100,0,-1000];
//类似打牌效果：
let newCamPosStart = [0, 20, 80], newTargetPosStart = [0, 0, -1];
let camMov = [0, 0, 0], targetMov = [0, 0, 0];
let tweenCount = 30;
let radius = 15;
let isTweenReady = false, isTweening = false;
//gl初始化
var canvas = document.querySelector("#canvas");
var gl = canvas.getContext("webgl");
if (!gl) {
return;
}
//controllers区
//let isMouseDown = false;
//贴图区
const picNum = 3;
let loaded = 0;
let isLoaded = false;
let textures = [];
let objects = [];
function loadImage(url, callback) {
var image = new Image();
image.src = url;
image.onload = callback;
return image;
}
var images = [];
function loadImages(urls, callback) {
//var images = [];
var imagesToLoad = urls.length;
// Called each time an image finished
// loading.
var onImageLoad = function () {
--imagesToLoad;
// If all the images are loaded call the callback.
if (imagesToLoad === 0) {
callback(images);
loader.style.display = 'none';
}
};
for (var ii = 0; ii < imagesToLoad; ++ii) {
var image = loadImage(urls[ii], onImageLoad);
images.push(image);
}
}
gl.enable(gl.DEPTH_TEST);
const targetTexture = gl.createTexture();
/* 加入depth buffer（1/3） */
const depthBuffer = gl.createRenderbuffer();
const fb = gl.createFramebuffer();
var arrays = {
position: { numComponents: 3, data: [-15.835, -10, 0, 15.835, -10, 0, -15.835, 10, 0, 15.835, 10, 0], },
texcoord: { numComponents: 2, data: [0, 1, 1, 1, 0, 0, 1, 0], },
indices: { numComponents: 3, data: [0, 1, 2, 1, 2, 3], },
};
var bufferInfo = webglUtils.createBufferInfoFromArrays(gl, arrays);
var programInfo = webglUtils.createProgramInfo(gl, ["vertex-shader-3d", "fragment-shader-3d"]);
var pickProgramInfo = webglUtils.createProgramInfo(gl, ["pick-vertex-shader-3d", "pick-fragment-shader-3d"]);
function degToRad(d) {
return d * Math.PI / 180;
}
var fieldOfViewRadians = degToRad(60);
var uniformsThatAreComputedForEachObject = {
u_worldViewProjection: m4.identity(),
};
var pickUniforms = {
u_worldViewProjection: m4.identity(),
};
function drawScene() {
resizeCanvasToDisplaySize(canvas);
aspect = gl.canvas.clientWidth / gl.canvas.clientHeight;
//需要一个viewMatrix
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
// Tell WebGL how to convert from clip space to pixels
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
gl.clearColor(0.9, 0.9, 0.9, 1.0);
// Clear the canvas AND the depth buffer.
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
var projectionMatrix = m4.perspective(fieldOfViewRadians, aspect, 1, 2000);
var viewProjectionMatrix = m4.multiply(projectionMatrix, viewMatrix);
gl.useProgram(programInfo.program);
// Setup all the needed buffers and attributes.
webglUtils.setBuffersAndAttributes(gl, programInfo, bufferInfo);
objects.forEach(function (object) {
var worldMatrix = m4.xRotation(0);
worldMatrix = m4.yRotate(worldMatrix, object.yRotation);
worldMatrix = m4.translate(worldMatrix, object.xTranslation, object.yTranslation, object.zTranslation);
m4.multiply(viewProjectionMatrix, worldMatrix, uniformsThatAreComputedForEachObject.u_worldViewProjection);
webglUtils.setUniforms(programInfo, uniformsThatAreComputedForEachObject);
webglUtils.setUniforms(programInfo, object.materialUniforms);
gl.drawElements(gl.TRIANGLES, bufferInfo.numElements, gl.UNSIGNED_SHORT, 0);
});
if (isTweening) {
requestAnimationFrame(tween);
}
//console.log('drawScene');
}
function renderPicking(e) {
resizeCanvasToDisplaySize(canvas);
aspect = gl.canvas.clientWidth / gl.canvas.clientHeight;
//render picking
//创建frame buffer
gl.bindTexture(gl.TEXTURE_2D, targetTexture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.canvas.width * 2, gl.canvas.height * 2, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
// 加入depth buffer（2/3）
gl.bindRenderbuffer(gl.RENDERBUFFER, depthBuffer);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, gl.canvas.width * 2, gl.canvas.height * 2);
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, targetTexture, 0);
// 加入depth buffer（3/3）
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, depthBuffer);
gl.bindTexture(gl.TEXTURE_2D, targetTexture);
// gl.disable(gl.BLEND);
// 创建mouse event对frustum matrix的转换通讯
const near = 1, far = 2000;
const top = Math.tan(degToRad(60) * 0.5) * near;
const bottom = -top;
const left = aspect * bottom;
const right = aspect * top;
const width = Math.abs(right - left);
const height = Math.abs(top - bottom);
const rect = canvas.getBoundingClientRect();
const pixelX = (e.clientX - rect.left) * gl.canvas.width / gl.canvas.clientWidth;
const pixelY = gl.canvas.height - (e.clientY - rect.top) * gl.canvas.height / gl.canvas.clientHeight - 1;
const subLeft = left + pixelX * width / gl.canvas.width;
const subBottom = bottom + pixelY * height / gl.canvas.height;
const subWidth = width / gl.canvas.width;
const subHeight = height / gl.canvas.height;
// Tell WebGL how to convert from clip space to pixels
gl.viewport(0, 0, 1, 1);
// Clear the canvas AND the depth buffer.
gl.clear(gl.COLOR_BUFFER_BIT); //| gl.DEPTH_BUFFER_BIT
var projectionMatrix = m4.frustum(subLeft, subLeft + subWidth, subBottom, subBottom + subHeight, near, far);
var viewProjectionMatrix = m4.multiply(projectionMatrix, viewMatrix);
gl.useProgram(pickProgramInfo.program);
webglUtils.setBuffersAndAttributes(gl, pickProgramInfo, bufferInfo);
webglUtils.setUniforms(pickProgramInfo, pickUniforms);
objects.forEach(function (object) {
var worldMatrix = m4.xRotation(0);
worldMatrix = m4.yRotate(worldMatrix, object.yRotation);
worldMatrix = m4.translate(worldMatrix, object.xTranslation, object.yTranslation, object.zTranslation);
// Multiply the matrices.
m4.multiply(viewProjectionMatrix, worldMatrix, pickUniforms.u_worldViewProjection);
// Set the uniforms we just computed
webglUtils.setUniforms(pickProgramInfo, pickUniforms);
webglUtils.setUniforms(pickProgramInfo, object.pickIDUniform);
gl.drawElements(gl.TRIANGLES, bufferInfo.numElements, gl.UNSIGNED_SHORT, 0);
});
//阅读物体id
const pixels = new Uint8Array(4);
gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, pixels);
id = pixels[0];
if (id == 255) { id = 0 }
//console.log(id);
}
function camPos() {
if (id < 0) {
var cameraMatrix = m4.lookAt(cameraPosition, target, up, m4.identity());
viewMatrix = m4.inverse(cameraMatrix);
} else if (id == 0) {
cameraPosition = [0, 0, 0];
target = [0, 0, -1000];
}
else {
/*
cameraPosition = [(1*id-15)*aspect, id*aspect, -20*id-20];
target = [(1*id+5)*aspect, id*aspect, -1000];
*/
cameraPosition = [(-12 * (id - 1) + 2) * aspect, (id - 1) * aspect, -20 * (id - 1) - 28];
//target = [(-12*(id-1)+5)*aspect,(id-1)*aspect,-1000];
}
}
function tweenRotate(e) {
if (!isTweening) {
id = e.target.id;
camPos();
tween();
// title.innerHTML = subtitles[id];
}
}
function tween() {
if (tweenCount > 0) {
if (!isTweenReady) {
prepareTween();
}
isTweening = true;
tweenCount -= 1;
newCamPosStart[0] += camMov[0];
newCamPosStart[1] += camMov[1];
newCamPosStart[2] += camMov[2];
newTargetPosStart[0] += targetMov[0];
newTargetPosStart[1] += targetMov[1];
newTargetPosStart[2] += targetMov[2];
var cameraMatrix = m4.lookAt(newCamPosStart, newTargetPosStart, up, m4.identity());
viewMatrix = m4.inverse(cameraMatrix);
requestAnimationFrame(drawScene);
} else {
isTweenReady = false;
isTweening = false;
//这里考虑清空并初始化初始值和差值，以准备重新开始prepareTween
newCamPosStart = cameraPosition;
newTargetPosStart = target;
tweenCount = 10;
}
}
function prepareTween() {
const newCamPosEnd = cameraPosition;
const newTargetPosEnd = target;
camMov[0] = (newCamPosEnd[0] - newCamPosStart[0]) / tweenCount;
camMov[1] = (newCamPosEnd[1] - newCamPosStart[1]) / tweenCount;
camMov[2] = (newCamPosEnd[2] - newCamPosStart[2]) / tweenCount;
targetMov[0] = (newTargetPosEnd[0] - newTargetPosStart[0]) / tweenCount;
targetMov[1] = (newTargetPosEnd[1] - newTargetPosStart[1]) / tweenCount;
targetMov[2] = (newTargetPosEnd[2] - newTargetPosStart[2]) / tweenCount;
isTweenReady = true;
}
function resizeCanvasToDisplaySize(canvas, multiplier) {
multiplier = multiplier || 2;
const width = canvas.clientWidth * multiplier | 0;
const height = canvas.clientHeight * multiplier | 0;
if (canvas.width !== width || canvas.height !== height) {
canvas.width = width;
canvas.height = height;
aspect = width / height;
return true;
}
return false;
//drawScene();
}
function init() {
camPos();
drawScene();
//tween();
loadImages([
"./nrh/3.jpeg",
"./nrh/2.jpeg",
"./nrh/1.jpeg",
], () => {
for (var ii = 0; ii < picNum; ++ii) {
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
// Set the parameters so we can render any size image.
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
// Upload the image into the texture.
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, images[ii]);
// add the texture to the array of textures.
textures.push(texture);
}
const object1 = {
yRotation: -Math.PI / 2,
xTranslation: 0,
yTranslation: 0,
zTranslation: -15.835,
materialUniforms: {
u_diffuse: textures[0],
},
pickIDUniform: {
u_id: [(0 + 1) / 255, 0, 0, 1],
}
}
const object2 = {
yRotation: 0,
xTranslation: 0,
yTranslation: 0,
zTranslation: -15.835,
materialUniforms: {
u_diffuse: textures[1],
},
pickIDUniform: {
u_id: [(1 + 1) / 255, 0, 0, 1],
}
}
const object3 = {
yRotation: Math.PI / 2,
xTranslation: 0,
yTranslation: 0,
zTranslation: -15.835,
materialUniforms: {
u_diffuse: textures[2],
},
pickIDUniform: {
u_id: [(2 + 1) / 255, 0, 0, 1],
}
}
objects.push(object1, object2, object3);
/*
for (var ii = 0; ii < picNum; ++ii) {
objects.push({
yRotation: 0,
xTranslation: (12*ii+5)*aspect,
yTranslation: ii*aspect,
zTranslation: -20*ii - 50,
materialUniforms: {
u_diffuse: textures[ii],
},
pickIDUniform: {
u_id: [(ii+1)/255, 0,0,1],
}
});
}*/
tween();
});
}
function pick(e) {
if (!isTweening) {
//console.log('pick');
renderPicking(e);
//camPos();
//tween();
//title.innerHTML = subtitles[id];
}
}
init();
function onMouseWheel(e) {
//console.log(e.deltaY);
cameraPosition[0] = 0;
cameraPosition[1] = 0;
radius += e.deltaY;
radius = Math.min(60, Math.max(1, radius));
//console.log(radius);
cameraPosition[2] = radius;
target = [0, 0, 0];
var cameraMatrix = m4.lookAt(cameraPosition, target, up, m4.identity());
viewMatrix = m4.inverse(cameraMatrix);
drawScene();
}
function onMouseDown(e) {
//isMouseDown = true;
canvas.addEventListener('mousemove', onMouseMove, false);
x1 = e.clientX, y1 = e.clientY;
}
let rad = 0;
function onMouseMove(e) {
target = [0, 0, 0];
x2 = e.clientX, y2 = e.clientY;
rad -= (x2 - x1) / 50;
cameraPosition[0] = radius * Math.cos(rad);
cameraPosition[2] = radius * Math.sin(rad);
//console.log(cameraPosition);
var cameraMatrix = m4.lookAt(cameraPosition, target, up, m4.identity());
viewMatrix = m4.inverse(cameraMatrix);
drawScene();
x1 = x2;
y1 = y2;
}
function onMouseUp() {
x1 = 0;
x2 = 0;
y1 = 0;
y2 = 0;
//isMouseDown = false;
canvas.removeEventListener('mousemove', onMouseMove, false);
}
function touchstart(e) {
switch (e.targetTouches.length) {
case 1:
x1 = e.pageX;
break;
default:
const deltaX = e.targetTouches[0].pageX - e.targetTouches[1].pageX;
const deltaY = e.targetTouches[0].pageY - e.targetTouches[1].pageY;
delta0 = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
//tmpConsole.innerText = delta0;
break;
}
window.addEventListener('touchmove', touchmove, false);
window.addEventListener('touchend', touchend, false);
}
function touchmove(e) {
e.preventDefault();
switch (e.targetTouches.length) {
case 1:
target = [0, 0, 0];
x2 = e.pageX, y2 = e.pageY;
rad -= (x2 - x1) / 50;
cameraPosition[0] = radius * Math.cos(rad);
cameraPosition[2] = radius * Math.sin(rad);
//console.log(cameraPosition);
var cameraMatrix = m4.lookAt(cameraPosition, target, up, m4.identity());
viewMatrix = m4.inverse(cameraMatrix);
drawScene();
x1 = x2;
y1 = y2;
break;
default:
const deltaX = e.targetTouches[0].pageX - e.targetTouches[1].pageX;
const deltaY = e.targetTouches[0].pageY - e.targetTouches[1].pageY;
if (!delta0) {
delta0 = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
} else {
delta1 = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
cameraPosition[0] = 0;
cameraPosition[1] = 0;
radius -= (delta1 - delta0);
radius = Math.min(60, Math.max(1, radius));
//tmpConsole.innerText = radius;
cameraPosition[2] = radius;
target = [0, 0, 0];
var cameraMatrix = m4.lookAt(cameraPosition, target, up, m4.identity());
viewMatrix = m4.inverse(cameraMatrix);
drawScene();
delta0 = delta1;
}
break;
}
}
function touchend() {
x1 = 0;
x2 = 0;
y1 = 0;
y2 = 0;
window.removeEventListener('touchmove', touchmove, false);
window.removeEventListener('touchend', touchend, false);
}
//canvas.addEventListener('click', pick, false);
window.addEventListener('resize', drawScene, false);
//canvas.addEventListener('mousemove', renderPicking, false);
//window.addEventListener('load', init, false);
canvas.addEventListener('mousedown', onMouseDown, false);
canvas.addEventListener('mouseup', onMouseUp, false);
canvas.addEventListener('wheel', onMouseWheel, { passive: false });
window.addEventListener('touchstart', touchstart, false);
document.addEventListener('gesturestart', function (event) { event.preventDefault() }, false);
}
main();
</script>
</body>
</html>