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OESVertexArrayObject.js
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OESVertexArrayObject.js
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(function() {
"use strict";
var glErrorShadow = { };
function error(msg) {
if (window.console && window.console.error) {
window.console.error(msg);
}
}
function log(msg) {
if (window.console && window.console.log) {
window.console.log(msg);
}
}
function synthesizeGLError(err, opt_msg) {
glErrorShadow[err] = true;
if (opt_msg !== undefined) {
error(opt_msg)
}
}
function wrapGLError(gl) {
var f = gl.getError;
gl.getError = function() {
var err;
do {
err = f.apply(gl);
if (err != gl.NO_ERROR) {
glErrorShadow[err] = true;
}
} while (err != gl.NO_ERROR);
for (var err in glErrorShadow) {
if (glErrorShadow[err]) {
delete glErrorShadow[err];
return parseInt(err);
}
}
return gl.NO_ERROR;
};
}
var WebGLVertexArrayObjectOES = function WebGLVertexArrayObjectOES(ext) {
var gl = ext.gl;
this.ext = ext;
this.isAlive = true;
this.hasBeenBound = false;
this.elementArrayBuffer = null;
this.attribs = new Array(ext.maxVertexAttribs);
for (var n = 0; n < this.attribs.length; n++) {
var attrib = new WebGLVertexArrayObjectOES.VertexAttrib(gl);
this.attribs[n] = attrib;
}
this.maxAttrib = 0;
};
WebGLVertexArrayObjectOES.VertexAttrib = function VertexAttrib(gl) {
this.enabled = false;
this.buffer = null;
this.size = 4;
this.type = gl.FLOAT;
this.normalized = false;
this.stride = 16;
this.offset = 0;
this.cached = "";
this.recache();
};
WebGLVertexArrayObjectOES.VertexAttrib.prototype.recache = function recache() {
this.cached = [this.size, this.type, this.normalized, this.stride, this.offset].join(":");
};
var OESVertexArrayObject = function OESVertexArrayObject(gl) {
var self = this;
this.gl = gl;
wrapGLError(gl);
var original = this.original = {
getParameter: gl.getParameter,
enableVertexAttribArray: gl.enableVertexAttribArray,
disableVertexAttribArray: gl.disableVertexAttribArray,
bindBuffer: gl.bindBuffer,
getVertexAttrib: gl.getVertexAttrib,
vertexAttribPointer: gl.vertexAttribPointer
};
gl.getParameter = function getParameter(pname) {
if (pname == self.VERTEX_ARRAY_BINDING_OES) {
if (self.currentVertexArrayObject == self.defaultVertexArrayObject) {
return null;
} else {
return self.currentVertexArrayObject;
}
}
return original.getParameter.apply(this, arguments);
};
gl.enableVertexAttribArray = function enableVertexAttribArray(index) {
var vao = self.currentVertexArrayObject;
vao.maxAttrib = Math.max(vao.maxAttrib, index);
var attrib = vao.attribs[index];
attrib.enabled = true;
return original.enableVertexAttribArray.apply(this, arguments);
};
gl.disableVertexAttribArray = function disableVertexAttribArray(index) {
var vao = self.currentVertexArrayObject;
vao.maxAttrib = Math.max(vao.maxAttrib, index);
var attrib = vao.attribs[index];
attrib.enabled = false;
return original.disableVertexAttribArray.apply(this, arguments);
};
gl.bindBuffer = function bindBuffer(target, buffer) {
switch (target) {
case gl.ARRAY_BUFFER:
self.currentArrayBuffer = buffer;
break;
case gl.ELEMENT_ARRAY_BUFFER:
self.currentVertexArrayObject.elementArrayBuffer = buffer;
break;
}
return original.bindBuffer.apply(this, arguments);
};
gl.getVertexAttrib = function getVertexAttrib(index, pname) {
var vao = self.currentVertexArrayObject;
var attrib = vao.attribs[index];
switch (pname) {
case gl.VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
return attrib.buffer;
case gl.VERTEX_ATTRIB_ARRAY_ENABLED:
return attrib.enabled;
case gl.VERTEX_ATTRIB_ARRAY_SIZE:
return attrib.size;
case gl.VERTEX_ATTRIB_ARRAY_STRIDE:
return attrib.stride;
case gl.VERTEX_ATTRIB_ARRAY_TYPE:
return attrib.type;
case gl.VERTEX_ATTRIB_ARRAY_NORMALIZED:
return attrib.normalized;
default:
return original.getVertexAttrib.apply(this, arguments);
}
};
gl.vertexAttribPointer = function vertexAttribPointer(indx, size, type, normalized, stride, offset) {
var vao = self.currentVertexArrayObject;
vao.maxAttrib = Math.max(vao.maxAttrib, indx);
var attrib = vao.attribs[indx];
attrib.buffer = self.currentArrayBuffer;
attrib.size = size;
attrib.type = type;
attrib.normalized = normalized;
attrib.stride = stride;
attrib.offset = offset;
attrib.recache();
return original.vertexAttribPointer.apply(this, arguments);
};
if (gl.instrumentExtension) {
gl.instrumentExtension(this, "OES_vertex_array_object");
}
gl.canvas.addEventListener('webglcontextrestored', function() {
log("OESVertexArrayObject emulation library context restored");
self.reset_();
}, true);
this.reset_();
};
OESVertexArrayObject.prototype.VERTEX_ARRAY_BINDING_OES = 0x85B5;
OESVertexArrayObject.prototype.reset_ = function reset_() {
var contextWasLost = this.vertexArrayObjects !== undefined;
if (contextWasLost) {
for (var ii = 0; ii < this.vertexArrayObjects.length; ++ii) {
this.vertexArrayObjects.isAlive = false;
}
}
this.maxVertexAttribs = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
this.defaultVertexArrayObject = new WebGLVertexArrayObjectOES(this);
this.currentVertexArrayObject = null;
this.currentArrayBuffer = null;
this.vertexArrayObjects = [this.defaultVertexArrayObject];
this.bindVertexArrayOES(null);
};
OESVertexArrayObject.prototype.createVertexArrayOES = function createVertexArrayOES() {
var arrayObject = new WebGLVertexArrayObjectOES(this);
this.vertexArrayObjects.push(arrayObject);
return arrayObject;
};
OESVertexArrayObject.prototype.deleteVertexArrayOES = function deleteVertexArrayOES(arrayObject) {
arrayObject.isAlive = false;
this.vertexArrayObjects.splice(this.vertexArrayObjects.indexOf(arrayObject), 1);
if (this.currentVertexArrayObject == arrayObject) {
this.bindVertexArrayOES(null);
}
};
OESVertexArrayObject.prototype.isVertexArrayOES = function isVertexArrayOES(arrayObject) {
if (arrayObject && arrayObject instanceof WebGLVertexArrayObjectOES) {
if (arrayObject.hasBeenBound && arrayObject.ext == this) {
return true;
}
}
return false;
};
OESVertexArrayObject.prototype.bindVertexArrayOES = function bindVertexArrayOES(arrayObject) {
var gl = this.gl;
if (arrayObject && !arrayObject.isAlive) {
synthesizeGLError(gl.INVALID_OPERATION, "bindVertexArrayOES: attempt to bind deleted arrayObject");
return;
}
var original = this.original;
var oldVAO = this.currentVertexArrayObject;
this.currentVertexArrayObject = arrayObject || this.defaultVertexArrayObject;
this.currentVertexArrayObject.hasBeenBound = true;
var newVAO = this.currentVertexArrayObject;
if (oldVAO == newVAO) {
return;
}
if (!oldVAO || newVAO.elementArrayBuffer != oldVAO.elementArrayBuffer) {
original.bindBuffer.call(gl, gl.ELEMENT_ARRAY_BUFFER, newVAO.elementArrayBuffer);
}
var currentBinding = this.currentArrayBuffer;
var maxAttrib = Math.max(oldVAO ? oldVAO.maxAttrib : 0, newVAO.maxAttrib);
for (var n = 0; n <= maxAttrib; n++) {
var attrib = newVAO.attribs[n];
var oldAttrib = oldVAO ? oldVAO.attribs[n] : null;
if (!oldVAO || attrib.enabled != oldAttrib.enabled) {
if (attrib.enabled) {
original.enableVertexAttribArray.call(gl, n);
} else {
original.disableVertexAttribArray.call(gl, n);
}
}
if (attrib.enabled) {
var bufferChanged = false;
if (!oldVAO || attrib.buffer != oldAttrib.buffer) {
if (currentBinding != attrib.buffer) {
original.bindBuffer.call(gl, gl.ARRAY_BUFFER, attrib.buffer);
currentBinding = attrib.buffer;
}
bufferChanged = true;
}
if (bufferChanged || attrib.cached != oldAttrib.cached) {
original.vertexAttribPointer.call(gl, n, attrib.size, attrib.type, attrib.normalized, attrib.stride, attrib.offset);
}
}
}
if (this.currentArrayBuffer != currentBinding) {
original.bindBuffer.call(gl, gl.ARRAY_BUFFER, this.currentArrayBuffer);
}
};
// You MUST call this BEFORE adding event listeners for 'webglcontextrestored'
window.setupVertexArrayObject = function(gl) {
// Ignore if already installed (or the browser provides the extension)
// FIXME: when all stable browsers support getSupportedExtensions
// and getExtension, remove the workarounds below.
if (gl.getSupportedExtensions) {
var exts = gl.getSupportedExtensions();
if (exts.indexOf("OES_vertex_array_object") != -1) {
return;
}
} else if (gl.getExtension) {
var vao = gl.getExtension("OES_vertex_array_object");
if (vao) {
return;
}
}
if (gl.getSupportedExtensions) {
var original_getSupportedExtensions = gl.getSupportedExtensions;
gl.getSupportedExtensions = function getSupportedExtensions() {
var list = original_getSupportedExtensions.call(this) || [];
list.push("OES_vertex_array_object");
return list;
};
}
var original_getExtension = gl.getExtension;
gl.getExtension = function getExtension(name) {
if (name == "OES_vertex_array_object") {
if (!gl.__OESVertexArrayObject) {
gl.__OESVertexArrayObject = new OESVertexArrayObject(gl);
}
return gl.__OESVertexArrayObject;
}
if (original_getExtension) {
return original_getExtension.call(this, name);
} else {
return null;
}
};
};
}());