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streaming_native_canvas.html
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streaming_native_canvas.html
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<html>
<head>
<script type="text/javascript" src="glmatrix.js"></script>
<script type="text/javascript" src="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;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
varying vec2 vTextureCoord;
void main(void) {
gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
vTextureCoord = aTextureCoord;
}
</script>
<script>
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");
}
var diffTexture;
function initTexture() {
diffTexture = gl.createTexture();
diffTexture.image = new Image();
}
var mvMatrix = mat4.create();
var mvMatrixStack = [];
var pMatrix = mat4.create();
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 cubeVertexPositionBuffer;
var cubeVertexTextureCoordBuffer;
var cubeVertexIndexBuffer;
function initBuffers() {
cubeVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
vertices = [
// Front face
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
// Back face
-1.0, -1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
// Top face
-1.0, 1.0, -1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
// Bottom face
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, 1.0,
// Right face
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
// Left face
-1.0, -1.0, -1.0,
-1.0, -1.0, 1.0,
-1.0, 1.0, 1.0,
-1.0, 1.0, -1.0,
];
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
cubeVertexPositionBuffer.itemSize = 3;
cubeVertexPositionBuffer.numItems = 24;
cubeVertexTextureCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer);
var textureCoords = [
// Front face
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
// Back face
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,
// Top face
0.0, 1.0,
0.0, 0.0,
1.0, 0.0,
1.0, 1.0,
// Bottom face
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,
1.0, 0.0,
// Right face
1.0, 0.0,
1.0, 1.0,
0.0, 1.0,
0.0, 0.0,
// Left face
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);
cubeVertexTextureCoordBuffer.itemSize = 2;
cubeVertexTextureCoordBuffer.numItems = 24;
cubeVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
var cubeVertexIndices = [
0, 1, 2, 0, 2, 3, // Front face
4, 5, 6, 4, 6, 7, // Back face
8, 9, 10, 8, 10, 11, // Top face
12, 13, 14, 12, 14, 15, // Bottom face
16, 17, 18, 16, 18, 19, // Right face
20, 21, 22, 20, 22, 23 // Left face
];
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cubeVertexIndices), gl.STATIC_DRAW);
cubeVertexIndexBuffer.itemSize = 1;
cubeVertexIndexBuffer.numItems = 36;
}
var xRot = 0;
var yRot = 0;
var zRot = 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, 0.1, 100.0, pMatrix);
mat4.identity(mvMatrix);
mat4.translate(mvMatrix, [0.0, 0.0, -2.0]);
mat4.rotate(mvMatrix, degToRad(xRot), [1, 0, 0]);
mat4.rotate(mvMatrix, degToRad(yRot), [0, 1, 0]);
mat4.rotate(mvMatrix, degToRad(zRot), [0, 0, 1]);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, cubeVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertexTextureCoordBuffer);
gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, cubeVertexTextureCoordBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, diffTexture);
gl.uniform1i(shaderProgram.samplerUniform, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeVertexIndexBuffer);
setMatrixUniforms();
gl.drawElements(gl.TRIANGLES, cubeVertexIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
}
var lastTime = 0;
function animate() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
passedTime = passedTime + elapsed;
xRot += (90 * elapsed) / 100000.0;
yRot += (90 * elapsed) / 100000.0;
zRot += (90 * elapsed) / 100000.0;
}
lastTime = timeNow;
}
function tick() {
requestAnimFrame(tick);
uploadTextur();
drawScene();
animate();
}
function uploadTextur() {
if(uploadTextureData) {
if(uploadTextureData.length>0) {
gl.bindTexture(gl.TEXTURE_2D, diffTexture);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texSubImage2D (gl.TEXTURE_2D, 0, 0, uploadTextureDataOffsetY, 2048, 32, gl.RGBA, gl.UNSIGNED_BYTE, uploadTextureData.subarray(0, 262144));
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.bindTexture(gl.TEXTURE_2D, null);
uploadTextureData = uploadTextureData.subarray(262144,uploadTextureData.length);
uploadTextureDataOffsetY = uploadTextureDataOffsetY - 32;
}
}
}
function webGLStart() {
var canvas = document.getElementById("canvas");
initGL(canvas);
initShaders();
initBuffers();
initTexture();
gl.clearColor(0.9, 0.9, 0.9, 1.0);
gl.enable(gl.DEPTH_TEST);
startDownload();
tick();
}
var src = "uv_2k.jpg";
var xhr = new XMLHttpRequest();
var worker;
var workerbusy = false;
var passedTime = 1001;
var uploadTextureData;
var uploadTextureDataOffsetX = 0;
var uploadTextureDataOffsetY = 0;
function startDownload() {
uploadTextureData = new Uint8Array(2048*2048*4);
for (var i=0;i<2048*2048*4;++i) {
uploadTextureData[i] = 0;
}
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.bindTexture(gl.TEXTURE_2D, diffTexture);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D (gl.TEXTURE_2D, 0, gl.RGBA, 2048, 2048, 0, gl.RGBA, gl.UNSIGNED_BYTE, uploadTextureData);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.bindTexture(gl.TEXTURE_2D, null);
diffTexture.uploaded = true;
uploadTextureData = null;
xhr.addEventListener("progress", updateProgress, false);
xhr.addEventListener("load", bindTexture, false);
xhr.overrideMimeType('text/plain; charset=x-user-defined');
xhr.open('GET', src);
xhr.send();
}
function updateProgress(e) {
if(workerbusy === false && passedTime >= 2500) {
passedTime = 0;
var t = (xhr.mozResponseArrayBuffer || xhr.mozResponse || xhr.responseArrayBuffer || xhr.response);
if(uploadTextureData != null) {
console.log(uploadTextureData.length);
}
//texture applied? if then start new worker
if(uploadTextureData == null || uploadTextureData.length == 0) {
workerbusy = true;
diffTexture.image.onload = function() {
var canvas2d = document.getElementById('canvas2d');
canvas2d.width = 2048;
canvas2d.height = 2048;
var ctx2d = canvas2d.getContext('2d');
ctx2d.drawImage(diffTexture.image, 0, 0);
var canvaspixelarray = ctx2d.getImageData(0, 0, 2048, 2048).data;
uploadTextureData = new Uint8Array(canvaspixelarray.length);
for (var i=0;i<canvaspixelarray.length;++i) {
uploadTextureData[i] = canvaspixelarray[i];
}
uploadTextureData = uploadTextureData;
uploadTextureDataOffsetY = 2048-32;
workerbusy = false;
};
diffTexture.image.src = "data:image/jpeg;base64," + base64Encode(t);
}
}
}
function bindTexture(e) {
var t = (xhr.mozResponseArrayBuffer || xhr.mozResponse || xhr.responseArrayBuffer || xhr.response);
diffTexture.image.onload = function() {
var canvas2d = document.getElementById('canvas2d');
canvas2d.width = 2048;
canvas2d.height = 2048;
var ctx2d = canvas2d.getContext('2d');
ctx2d.drawImage(diffTexture.image, 0, 0);
var canvaspixelarray = ctx2d.getImageData(0, 0, 2048, 2048).data;
uploadTextureData = new Uint8Array(canvaspixelarray.length);
for (var i=0;i<canvaspixelarray.length;++i) {
uploadTextureData[i] = canvaspixelarray[i];
}
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.bindTexture(gl.TEXTURE_2D, diffTexture);
gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, false);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
if(!diffTexture.uploaded) {
gl.texImage2D (gl.TEXTURE_2D, 0, gl.RGBA, 2048, 2048, 0, gl.RGBA, gl.UNSIGNED_BYTE, uploadTextureData);
diffTexture.uploaded = true;
} else {
uploadTextureData = uploadTextureData;
uploadTextureDataOffsetY = 2048-32;
}
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
gl.bindTexture(gl.TEXTURE_2D, null);
};
diffTexture.image.src = "data:image/jpeg;base64," + base64Encode(t);
}
// This encoding function is from Philippe Tenenhaus's example at http://www.philten.com/us-xmlhttprequest-image/
// mentioned in http://blogs.adobe.com/webplatform/2012/01/13/html5-image-progress-events/
function base64Encode(inputStr) {
var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
var outputStr = "";
var i = 0;
while (i < inputStr.length) {
//all three "& 0xff" added below are there to fix a known bug
//with bytes returned by xhr.responseText
var byte1 = inputStr.charCodeAt(i++) & 0xff;
var byte2 = inputStr.charCodeAt(i++) & 0xff;
var byte3 = inputStr.charCodeAt(i++) & 0xff;
var enc1 = byte1 >> 2;
var enc2 = ((byte1 & 3) << 4) | (byte2 >> 4);
var enc3, enc4;
if (isNaN(byte2)) {
enc3 = enc4 = 64;
} else {
enc3 = ((byte2 & 15) << 2) | (byte3 >> 6);
if (isNaN(byte3)) {
enc4 = 64;
} else {
enc4 = byte3 & 63;
}
}
outputStr += b64.charAt(enc1) + b64.charAt(enc2) + b64.charAt(enc3) + b64.charAt(enc4);
}
return outputStr;
}
</script>
</head>
<body onload="webGLStart();">
<div>
<canvas id="canvas" width="1024" height="1024"></canvas>
</div>
<div>
<canvas id="canvas2d" width="1024" height="1024"></canvas>
</div>
</body>
</html>