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- <html>
- <head>
- <title>3D Plane Map</title>
- <meta http-equiv="content-type" content="text/html; charset=utf-8">
- <style type="text/css">
- html, body, #canvas-main {
- width: 100%;
- height: 100%;
- margin: 0px;
- }
- </style>
- <script type="text/javascript" src="scripts/glMatrix.js"></script>
- <script type="text/javascript" src="scripts/webgl-utils.js"></script>
- <script id="shader-fs" type="x-shader/x-fragment">
- precision mediump float;
- varying vec2 vTextureCoord;
- uniform sampler2D uSampler;
- void main(void) {
- gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));
- }
- </script>
- <script id="shader-vs" type="x-shader/x-vertex">
- attribute vec3 aVertexPosition;
- attribute vec2 aTextureCoord;
- varying vec2 vTextureCoord;
- uniform mat4 uMVMatrix;
- uniform mat4 uPMatrix;
- void main(void) {
- gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
- vTextureCoord = aTextureCoord;
- }
- </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, "shader-fs");
- var vertexShader = getShader(gl, "shader-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.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
- gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);
- shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
- shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
- shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
- }
- function handleLoadedTexture(texture) {
- gl.bindTexture(gl.TEXTURE_2D, texture);
- gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
- 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.NEAREST);
- gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
- gl.bindTexture(gl.TEXTURE_2D, null);
- }
- var myTexture;
- function initTexture() {
- myTexture = gl.createTexture();
- myTexture.image = new Image();
- myTexture.image.onload = function () {
- handleLoadedTexture(myTexture)
- }
- myTexture.image.src = "moscow.jpg";
- }
- var mvMatrix = mat4.create();
- var pMatrix = mat4.create();
- var mvMatrixStack = [];
- function mvPushMatrix() {
- var copy = mat4.create();
- mat4.set(mvMatrix, copy);
- mvMatrixStack.push(copy);
- }
- function mvPopMatrix() {
- if (mvMatrixStack.length == 0) {
- throw "Invalid popMatrix!";
- }
- mvMatrix = mvMatrixStack.pop();
- }
- function setMatrixUniforms() {
- gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, pMatrix);
- gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, mvMatrix);
- }
- function degToRad(degrees) {
- return degrees * Math.PI / 180;
- }
- var squareVertexPositionBuffer;
- var squareVertexTextureCoordBuffer;
- var squareVertexIndexBuffer;
- function initBuffers() {
- squareVertexPositionBuffer = gl.createBuffer();
- gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);
- vertices = [
- 1.0, 1.0, 0.0,
- -1.0, 1.0, 0.0,
- 1.0, -1.0, 0.0,
- -1.0, -1.0, 0.0
- ];
- gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
- squareVertexPositionBuffer.itemSize = 3;
- squareVertexPositionBuffer.numItems = 4;
- squareVertexTextureCoordBuffer = gl.createBuffer();
- gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexTextureCoordBuffer);
- var textureCoords = [
- 0.0, 0.0,
- 1.0, 0.0,
- 1.0, 1.0,
- 0.0, 1.0,
- ];
- gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureCoords), gl.STATIC_DRAW);
- squareVertexTextureCoordBuffer.itemSize = 2;
- squareVertexTextureCoordBuffer.numItems = 4;
- }
- var rSquare = 0;
- function drawScene() {
- gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
- gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
- mat4.perspective(45, gl.viewportWidth / gl.viewportHeight / 3, 0.1, 100.0, pMatrix);
- mat4.identity(mvMatrix);
- mat4.translate(mvMatrix, [0.0, 0.0, -5.0]);
- mvPushMatrix();
- mat4.rotate(mvMatrix, degToRad(rSquare), [1, 0, 0]);
- gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexPositionBuffer);
- gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, squareVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
- gl.bindBuffer(gl.ARRAY_BUFFER, squareVertexTextureCoordBuffer);
- gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, squareVertexTextureCoordBuffer.itemSize, gl.FLOAT, false, 0, 0);
- gl.activeTexture(gl.TEXTURE0);
- gl.bindTexture(gl.TEXTURE_2D, myTexture);
- gl.uniform1i(shaderProgram.samplerUniform, 0);
- setMatrixUniforms();
- gl.drawArrays(gl.TRIANGLE_STRIP, 0, squareVertexPositionBuffer.numItems);
- mvPopMatrix();
- }
- var lastTime = 0;
- function animate() {
- var timeNow = new Date().getTime();
- if (lastTime != 0) {
- var elapsed = timeNow - lastTime;
- rSquare += (75 * elapsed) / 1000.0;
- }
- lastTime = timeNow;
- }
- function tick() {
- requestAnimFrame(tick);
- drawScene();
- animate();
- }
- function webGLStart() {
- var canvas = document.getElementById("canvas-main");
- initGL(canvas);
- initShaders();
- initBuffers();
- initTexture();
- gl.clearColor(0.0, 0.0, 0.0, 1.0);
- gl.enable(gl.DEPTH_TEST);
- drawScene();
- tick();
- }
- </script>
- </head>
- <body onload="webGLStart();">
- <canvas id="canvas-main" style="border: none; width: 100%; height: 100%;"></canvas>
- </body>
- </html>
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