import Check from '../Core/Check.js';
import ComponentDatatype from '../Core/ComponentDatatype.js';
import defaultValue from '../Core/defaultValue.js';
import defined from '../Core/defined.js';
import defineProperties from '../Core/defineProperties.js';
import destroyObject from '../Core/destroyObject.js';
import DeveloperError from '../Core/DeveloperError.js';
import Geometry from '../Core/Geometry.js';
import IndexDatatype from '../Core/IndexDatatype.js';
import CesiumMath from '../Core/Math.js';
import RuntimeError from '../Core/RuntimeError.js';
import Buffer from './Buffer.js';
import BufferUsage from './BufferUsage.js';
import ContextLimits from './ContextLimits.js';
function addAttribute(attributes, attribute, index, context) {
var hasVertexBuffer = defined(attribute.vertexBuffer);
var hasValue = defined(attribute.value);
var componentsPerAttribute = attribute.value ? attribute.value.length : attribute.componentsPerAttribute;
//>>includeStart('debug', pragmas.debug);
if (!hasVertexBuffer && !hasValue) {
throw new DeveloperError('attribute must have a vertexBuffer or a value.');
}
if (hasVertexBuffer && hasValue) {
throw new DeveloperError('attribute cannot have both a vertexBuffer and a value. It must have either a vertexBuffer property defining per-vertex data or a value property defining data for all vertices.');
}
if ((componentsPerAttribute !== 1) &&
(componentsPerAttribute !== 2) &&
(componentsPerAttribute !== 3) &&
(componentsPerAttribute !== 4)) {
if (hasValue) {
throw new DeveloperError('attribute.value.length must be in the range [1, 4].');
}
throw new DeveloperError('attribute.componentsPerAttribute must be in the range [1, 4].');
}
if (defined(attribute.componentDatatype) && !ComponentDatatype.validate(attribute.componentDatatype)) {
throw new DeveloperError('attribute must have a valid componentDatatype or not specify it.');
}
if (defined(attribute.strideInBytes) && (attribute.strideInBytes > 255)) {
// WebGL limit. Not in GL ES.
throw new DeveloperError('attribute must have a strideInBytes less than or equal to 255 or not specify it.');
}
if (defined(attribute.instanceDivisor) && (attribute.instanceDivisor > 0) && !context.instancedArrays) {
throw new DeveloperError('instanced arrays is not supported');
}
if (defined(attribute.instanceDivisor) && (attribute.instanceDivisor < 0)) {
throw new DeveloperError('attribute must have an instanceDivisor greater than or equal to zero');
}
if (defined(attribute.instanceDivisor) && hasValue) {
throw new DeveloperError('attribute cannot have have an instanceDivisor if it is not backed by a buffer');
}
if (defined(attribute.instanceDivisor) && (attribute.instanceDivisor > 0) && (attribute.index === 0)) {
throw new DeveloperError('attribute zero cannot have an instanceDivisor greater than 0');
}
//>>includeEnd('debug');
// Shallow copy the attribute; we do not want to copy the vertex buffer.
var attr = {
index : defaultValue(attribute.index, index),
enabled : defaultValue(attribute.enabled, true),
vertexBuffer : attribute.vertexBuffer,
value : hasValue ? attribute.value.slice(0) : undefined,
componentsPerAttribute : componentsPerAttribute,
componentDatatype : defaultValue(attribute.componentDatatype, ComponentDatatype.FLOAT),
normalize : defaultValue(attribute.normalize, false),
offsetInBytes : defaultValue(attribute.offsetInBytes, 0),
strideInBytes : defaultValue(attribute.strideInBytes, 0),
instanceDivisor : defaultValue(attribute.instanceDivisor, 0)
};
if (hasVertexBuffer) {
// Common case: vertex buffer for per-vertex data
attr.vertexAttrib = function(gl) {
var index = this.index;
gl.bindBuffer(gl.ARRAY_BUFFER, this.vertexBuffer._getBuffer());
gl.vertexAttribPointer(index, this.componentsPerAttribute, this.componentDatatype, this.normalize, this.strideInBytes, this.offsetInBytes);
gl.enableVertexAttribArray(index);
if (this.instanceDivisor > 0) {
context.glVertexAttribDivisor(index, this.instanceDivisor);
context._vertexAttribDivisors[index] = this.instanceDivisor;
context._previousDrawInstanced = true;
}
};
attr.disableVertexAttribArray = function(gl) {
gl.disableVertexAttribArray(this.index);
if (this.instanceDivisor > 0) {
context.glVertexAttribDivisor(index, 0);
}
};
} else {
// Less common case: value array for the same data for each vertex
switch (attr.componentsPerAttribute) {
case 1:
attr.vertexAttrib = function(gl) {
gl.vertexAttrib1fv(this.index, this.value);
};
break;
case 2:
attr.vertexAttrib = function(gl) {
gl.vertexAttrib2fv(this.index, this.value);
};
break;
case 3:
attr.vertexAttrib = function(gl) {
gl.vertexAttrib3fv(this.index, this.value);
};
break;
case 4:
attr.vertexAttrib = function(gl) {
gl.vertexAttrib4fv(this.index, this.value);
};
break;
}
attr.disableVertexAttribArray = function(gl) {
};
}
attributes.push(attr);
}
function bind(gl, attributes, indexBuffer) {
for ( var i = 0; i < attributes.length; ++i) {
var attribute = attributes[i];
if (attribute.enabled) {
attribute.vertexAttrib(gl);
}
}
if (defined(indexBuffer)) {
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer._getBuffer());
}
}
/**
* Creates a vertex array, which defines the attributes making up a vertex, and contains an optional index buffer
* to select vertices for rendering. Attributes are defined using object literals as shown in Example 1 below.
*
* @param {Object} options Object with the following properties:
* @param {Context} options.context The context in which the VertexArray gets created.
* @param {Object[]} options.attributes An array of attributes.
* @param {IndexBuffer} [options.indexBuffer] An optional index buffer.
*
* @returns {VertexArray} The vertex array, ready for use with drawing.
*
* @exception {DeveloperError} Attribute must have a vertexBuffer.
* @exception {DeveloperError} Attribute must have a componentsPerAttribute.
* @exception {DeveloperError} Attribute must have a valid componentDatatype or not specify it.
* @exception {DeveloperError} Attribute must have a strideInBytes less than or equal to 255 or not specify it.
* @exception {DeveloperError} Index n is used by more than one attribute.
*
*
* @example
* // Example 1. Create a vertex array with vertices made up of three floating point
* // values, e.g., a position, from a single vertex buffer. No index buffer is used.
* var positionBuffer = Buffer.createVertexBuffer({
* context : context,
* sizeInBytes : 12,
* usage : BufferUsage.STATIC_DRAW
* });
* var attributes = [
* {
* index : 0,
* enabled : true,
* vertexBuffer : positionBuffer,
* componentsPerAttribute : 3,
* componentDatatype : ComponentDatatype.FLOAT,
* normalize : false,
* offsetInBytes : 0,
* strideInBytes : 0 // tightly packed
* instanceDivisor : 0 // not instanced
* }
* ];
* var va = new VertexArray({
* context : context,
* attributes : attributes
* });
*
* @example
* // Example 2. Create a vertex array with vertices from two different vertex buffers.
* // Each vertex has a three-component position and three-component normal.
* var positionBuffer = Buffer.createVertexBuffer({
* context : context,
* sizeInBytes : 12,
* usage : BufferUsage.STATIC_DRAW
* });
* var normalBuffer = Buffer.createVertexBuffer({
* context : context,
* sizeInBytes : 12,
* usage : BufferUsage.STATIC_DRAW
* });
* var attributes = [
* {
* index : 0,
* vertexBuffer : positionBuffer,
* componentsPerAttribute : 3,
* componentDatatype : ComponentDatatype.FLOAT
* },
* {
* index : 1,
* vertexBuffer : normalBuffer,
* componentsPerAttribute : 3,
* componentDatatype : ComponentDatatype.FLOAT
* }
* ];
* var va = new VertexArray({
* context : context,
* attributes : attributes
* });
*
* @example
* // Example 3. Creates the same vertex layout as Example 2 using a single
* // vertex buffer, instead of two.
* var buffer = Buffer.createVertexBuffer({
* context : context,
* sizeInBytes : 24,
* usage : BufferUsage.STATIC_DRAW
* });
* var attributes = [
* {
* vertexBuffer : buffer,
* componentsPerAttribute : 3,
* componentDatatype : ComponentDatatype.FLOAT,
* offsetInBytes : 0,
* strideInBytes : 24
* },
* {
* vertexBuffer : buffer,
* componentsPerAttribute : 3,
* componentDatatype : ComponentDatatype.FLOAT,
* normalize : true,
* offsetInBytes : 12,
* strideInBytes : 24
* }
* ];
* var va = new VertexArray({
* context : context,
* attributes : attributes
* });
*
* @see Buffer#createVertexBuffer
* @see Buffer#createIndexBuffer
* @see Context#draw
*
* @private
*/
function VertexArray(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
//>>includeStart('debug', pragmas.debug);
Check.defined('options.context', options.context);
Check.defined('options.attributes', options.attributes);
//>>includeEnd('debug');
var context = options.context;
var gl = context._gl;
var attributes = options.attributes;
var indexBuffer = options.indexBuffer;
var i;
var vaAttributes = [];
var numberOfVertices = 1; // if every attribute is backed by a single value
var hasInstancedAttributes = false;
var hasConstantAttributes = false;
var length = attributes.length;
for (i = 0; i < length; ++i) {
addAttribute(vaAttributes, attributes[i], i, context);
}
length = vaAttributes.length;
for (i = 0; i < length; ++i) {
var attribute = vaAttributes[i];
if (defined(attribute.vertexBuffer) && (attribute.instanceDivisor === 0)) {
// This assumes that each vertex buffer in the vertex array has the same number of vertices.
var bytes = attribute.strideInBytes || (attribute.componentsPerAttribute * ComponentDatatype.getSizeInBytes(attribute.componentDatatype));
numberOfVertices = attribute.vertexBuffer.sizeInBytes / bytes;
break;
}
}
for (i = 0; i < length; ++i) {
if (vaAttributes[i].instanceDivisor > 0) {
hasInstancedAttributes = true;
}
if (defined(vaAttributes[i].value)) {
hasConstantAttributes = true;
}
}
//>>includeStart('debug', pragmas.debug);
// Verify all attribute names are unique
var uniqueIndices = {};
for (i = 0; i < length; ++i) {
var index = vaAttributes[i].index;
if (uniqueIndices[index]) {
throw new DeveloperError('Index ' + index + ' is used by more than one attribute.');
}
uniqueIndices[index] = true;
}
//>>includeEnd('debug');
var vao;
// Setup VAO if supported
if (context.vertexArrayObject) {
vao = context.glCreateVertexArray();
context.glBindVertexArray(vao);
bind(gl, vaAttributes, indexBuffer);
context.glBindVertexArray(null);
}
this._numberOfVertices = numberOfVertices;
this._hasInstancedAttributes = hasInstancedAttributes;
this._hasConstantAttributes = hasConstantAttributes;
this._context = context;
this._gl = gl;
this._vao = vao;
this._attributes = vaAttributes;
this._indexBuffer = indexBuffer;
}
function computeNumberOfVertices(attribute) {
return attribute.values.length / attribute.componentsPerAttribute;
}
function computeAttributeSizeInBytes(attribute) {
return ComponentDatatype.getSizeInBytes(attribute.componentDatatype) * attribute.componentsPerAttribute;
}
function interleaveAttributes(attributes) {
var j;
var name;
var attribute;
// Extract attribute names.
var names = [];
for (name in attributes) {
// Attribute needs to have per-vertex values; not a constant value for all vertices.
if (attributes.hasOwnProperty(name) &&
defined(attributes[name]) &&
defined(attributes[name].values)) {
names.push(name);
if (attributes[name].componentDatatype === ComponentDatatype.DOUBLE) {
attributes[name].componentDatatype = ComponentDatatype.FLOAT;
attributes[name].values = ComponentDatatype.createTypedArray(ComponentDatatype.FLOAT, attributes[name].values);
}
}
}
// Validation. Compute number of vertices.
var numberOfVertices;
var namesLength = names.length;
if (namesLength > 0) {
numberOfVertices = computeNumberOfVertices(attributes[names[0]]);
for (j = 1; j < namesLength; ++j) {
var currentNumberOfVertices = computeNumberOfVertices(attributes[names[j]]);
if (currentNumberOfVertices !== numberOfVertices) {
throw new RuntimeError(
'Each attribute list must have the same number of vertices. ' +
'Attribute ' + names[j] + ' has a different number of vertices ' +
'(' + currentNumberOfVertices.toString() + ')' +
' than attribute ' + names[0] +
' (' + numberOfVertices.toString() + ').');
}
}
}
// Sort attributes by the size of their components. From left to right, a vertex stores floats, shorts, and then bytes.
names.sort(function(left, right) {
return ComponentDatatype.getSizeInBytes(attributes[right].componentDatatype) - ComponentDatatype.getSizeInBytes(attributes[left].componentDatatype);
});
// Compute sizes and strides.
var vertexSizeInBytes = 0;
var offsetsInBytes = {};
for (j = 0; j < namesLength; ++j) {
name = names[j];
attribute = attributes[name];
offsetsInBytes[name] = vertexSizeInBytes;
vertexSizeInBytes += computeAttributeSizeInBytes(attribute);
}
if (vertexSizeInBytes > 0) {
// Pad each vertex to be a multiple of the largest component datatype so each
// attribute can be addressed using typed arrays.
var maxComponentSizeInBytes = ComponentDatatype.getSizeInBytes(attributes[names[0]].componentDatatype); // Sorted large to small
var remainder = vertexSizeInBytes % maxComponentSizeInBytes;
if (remainder !== 0) {
vertexSizeInBytes += (maxComponentSizeInBytes - remainder);
}
// Total vertex buffer size in bytes, including per-vertex padding.
var vertexBufferSizeInBytes = numberOfVertices * vertexSizeInBytes;
// Create array for interleaved vertices. Each attribute has a different view (pointer) into the array.
var buffer = new ArrayBuffer(vertexBufferSizeInBytes);
var views = {};
for (j = 0; j < namesLength; ++j) {
name = names[j];
var sizeInBytes = ComponentDatatype.getSizeInBytes(attributes[name].componentDatatype);
views[name] = {
pointer : ComponentDatatype.createTypedArray(attributes[name].componentDatatype, buffer),
index : offsetsInBytes[name] / sizeInBytes, // Offset in ComponentType
strideInComponentType : vertexSizeInBytes / sizeInBytes
};
}
// Copy attributes into one interleaved array.
// PERFORMANCE_IDEA: Can we optimize these loops?
for (j = 0; j < numberOfVertices; ++j) {
for ( var n = 0; n < namesLength; ++n) {
name = names[n];
attribute = attributes[name];
var values = attribute.values;
var view = views[name];
var pointer = view.pointer;
var numberOfComponents = attribute.componentsPerAttribute;
for ( var k = 0; k < numberOfComponents; ++k) {
pointer[view.index + k] = values[(j * numberOfComponents) + k];
}
view.index += view.strideInComponentType;
}
}
return {
buffer : buffer,
offsetsInBytes : offsetsInBytes,
vertexSizeInBytes : vertexSizeInBytes
};
}
// No attributes to interleave.
return undefined;
}
/**
* Creates a vertex array from a geometry. A geometry contains vertex attributes and optional index data
* in system memory, whereas a vertex array contains vertex buffers and an optional index buffer in WebGL
* memory for use with rendering.
*
* The geometry argument should use the standard layout like the geometry returned by {@link BoxGeometry}.
*
* options can have four properties:
*
* geometry: The source geometry containing data used to create the vertex array.attributeLocations: An object that maps geometry attribute names to vertex shader attribute locations.bufferUsage: The expected usage pattern of the vertex array's buffers. On some WebGL implementations, this can significantly affect performance. See {@link BufferUsage}. Default: BufferUsage.DYNAMIC_DRAW.interleave: Determines if all attributes are interleaved in a single vertex buffer or if each attribute is stored in a separate vertex buffer. Default: false.
*
* If options is not specified or the geometry contains no data, the returned vertex array is empty.
*
* @param {Object} options An object defining the geometry, attribute indices, buffer usage, and vertex layout used to create the vertex array.
*
* @exception {RuntimeError} Each attribute list must have the same number of vertices.
* @exception {DeveloperError} The geometry must have zero or one index lists.
* @exception {DeveloperError} Index n is used by more than one attribute.
*
*
* @example
* // Example 1. Creates a vertex array for rendering a box. The default dynamic draw
* // usage is used for the created vertex and index buffer. The attributes are not
* // interleaved by default.
* var geometry = new BoxGeometry();
* var va = VertexArray.fromGeometry({
* context : context,
* geometry : geometry,
* attributeLocations : GeometryPipeline.createAttributeLocations(geometry),
* });
*
* @example
* // Example 2. Creates a vertex array with interleaved attributes in a
* // single vertex buffer. The vertex and index buffer have static draw usage.
* var va = VertexArray.fromGeometry({
* context : context,
* geometry : geometry,
* attributeLocations : GeometryPipeline.createAttributeLocations(geometry),
* bufferUsage : BufferUsage.STATIC_DRAW,
* interleave : true
* });
*
* @example
* // Example 3. When the caller destroys the vertex array, it also destroys the
* // attached vertex buffer(s) and index buffer.
* va = va.destroy();
*
* @see Buffer#createVertexBuffer
* @see Buffer#createIndexBuffer
* @see GeometryPipeline.createAttributeLocations
* @see ShaderProgram
*/
VertexArray.fromGeometry = function(options) {
options = defaultValue(options, defaultValue.EMPTY_OBJECT);
//>>includeStart('debug', pragmas.debug);
Check.defined('options.context', options.context);
//>>includeEnd('debug');
var context = options.context;
var geometry = defaultValue(options.geometry, defaultValue.EMPTY_OBJECT);
var bufferUsage = defaultValue(options.bufferUsage, BufferUsage.DYNAMIC_DRAW);
var attributeLocations = defaultValue(options.attributeLocations, defaultValue.EMPTY_OBJECT);
var interleave = defaultValue(options.interleave, false);
var createdVAAttributes = options.vertexArrayAttributes;
var name;
var attribute;
var vertexBuffer;
var vaAttributes = (defined(createdVAAttributes)) ? createdVAAttributes : [];
var attributes = geometry.attributes;
if (interleave) {
// Use a single vertex buffer with interleaved vertices.
var interleavedAttributes = interleaveAttributes(attributes);
if (defined(interleavedAttributes)) {
vertexBuffer = Buffer.createVertexBuffer({
context : context,
typedArray : interleavedAttributes.buffer,
usage : bufferUsage
});
var offsetsInBytes = interleavedAttributes.offsetsInBytes;
var strideInBytes = interleavedAttributes.vertexSizeInBytes;
for (name in attributes) {
if (attributes.hasOwnProperty(name) && defined(attributes[name])) {
attribute = attributes[name];
if (defined(attribute.values)) {
// Common case: per-vertex attributes
vaAttributes.push({
index : attributeLocations[name],
vertexBuffer : vertexBuffer,
componentDatatype : attribute.componentDatatype,
componentsPerAttribute : attribute.componentsPerAttribute,
normalize : attribute.normalize,
offsetInBytes : offsetsInBytes[name],
strideInBytes : strideInBytes
});
} else {
// Constant attribute for all vertices
vaAttributes.push({
index : attributeLocations[name],
value : attribute.value,
componentDatatype : attribute.componentDatatype,
normalize : attribute.normalize
});
}
}
}
}
} else {
// One vertex buffer per attribute.
for (name in attributes) {
if (attributes.hasOwnProperty(name) && defined(attributes[name])) {
attribute = attributes[name];
var componentDatatype = attribute.componentDatatype;
if (componentDatatype === ComponentDatatype.DOUBLE) {
componentDatatype = ComponentDatatype.FLOAT;
}
vertexBuffer = undefined;
if (defined(attribute.values)) {
vertexBuffer = Buffer.createVertexBuffer({
context : context,
typedArray : ComponentDatatype.createTypedArray(componentDatatype, attribute.values),
usage : bufferUsage
});
}
vaAttributes.push({
index : attributeLocations[name],
vertexBuffer : vertexBuffer,
value : attribute.value,
componentDatatype : componentDatatype,
componentsPerAttribute : attribute.componentsPerAttribute,
normalize : attribute.normalize
});
}
}
}
var indexBuffer;
var indices = geometry.indices;
if (defined(indices)) {
if ((Geometry.computeNumberOfVertices(geometry) >= CesiumMath.SIXTY_FOUR_KILOBYTES) && context.elementIndexUint) {
indexBuffer = Buffer.createIndexBuffer({
context : context,
typedArray : new Uint32Array(indices),
usage : bufferUsage,
indexDatatype : IndexDatatype.UNSIGNED_INT
});
} else{
indexBuffer = Buffer.createIndexBuffer({
context : context,
typedArray : new Uint16Array(indices),
usage : bufferUsage,
indexDatatype : IndexDatatype.UNSIGNED_SHORT
});
}
}
return new VertexArray({
context : context,
attributes : vaAttributes,
indexBuffer : indexBuffer
});
};
defineProperties(VertexArray.prototype, {
numberOfAttributes : {
get : function() {
return this._attributes.length;
}
},
numberOfVertices : {
get : function() {
return this._numberOfVertices;
}
},
indexBuffer : {
get : function() {
return this._indexBuffer;
}
}
});
/**
* index is the location in the array of attributes, not the index property of an attribute.
*/
VertexArray.prototype.getAttribute = function(index) {
//>>includeStart('debug', pragmas.debug);
Check.defined('index', index);
//>>includeEnd('debug');
return this._attributes[index];
};
// Workaround for ANGLE, where the attribute divisor seems to be part of the global state instead
// of the VAO state. This function is called when the vao is bound, and should be removed
// once the ANGLE issue is resolved. Setting the divisor should normally happen in vertexAttrib and
// disableVertexAttribArray.
function setVertexAttribDivisor(vertexArray) {
var context = vertexArray._context;
var hasInstancedAttributes = vertexArray._hasInstancedAttributes;
if (!hasInstancedAttributes && !context._previousDrawInstanced) {
return;
}
context._previousDrawInstanced = hasInstancedAttributes;
var divisors = context._vertexAttribDivisors;
var attributes = vertexArray._attributes;
var maxAttributes = ContextLimits.maximumVertexAttributes;
var i;
if (hasInstancedAttributes) {
var length = attributes.length;
for (i = 0; i < length; ++i) {
var attribute = attributes[i];
if (attribute.enabled) {
var divisor = attribute.instanceDivisor;
var index = attribute.index;
if (divisor !== divisors[index]) {
context.glVertexAttribDivisor(index, divisor);
divisors[index] = divisor;
}
}
}
} else {
for (i = 0; i < maxAttributes; ++i) {
if (divisors[i] > 0) {
context.glVertexAttribDivisor(i, 0);
divisors[i] = 0;
}
}
}
}
// Vertex attributes backed by a constant value go through vertexAttrib[1234]f[v]
// which is part of context state rather than VAO state.
function setConstantAttributes(vertexArray, gl) {
var attributes = vertexArray._attributes;
var length = attributes.length;
for (var i = 0; i < length; ++i) {
var attribute = attributes[i];
if (attribute.enabled && defined(attribute.value)) {
attribute.vertexAttrib(gl);
}
}
}
VertexArray.prototype._bind = function() {
if (defined(this._vao)) {
this._context.glBindVertexArray(this._vao);
if (this._context.instancedArrays) {
setVertexAttribDivisor(this);
}
if (this._hasConstantAttributes) {
setConstantAttributes(this, this._gl);
}
} else {
bind(this._gl, this._attributes, this._indexBuffer);
}
};
VertexArray.prototype._unBind = function() {
if (defined(this._vao)) {
this._context.glBindVertexArray(null);
} else {
var attributes = this._attributes;
var gl = this._gl;
for ( var i = 0; i < attributes.length; ++i) {
var attribute = attributes[i];
if (attribute.enabled) {
attribute.disableVertexAttribArray(gl);
}
}
if (this._indexBuffer) {
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
}
}
};
VertexArray.prototype.isDestroyed = function() {
return false;
};
VertexArray.prototype.destroy = function() {
var attributes = this._attributes;
for ( var i = 0; i < attributes.length; ++i) {
var vertexBuffer = attributes[i].vertexBuffer;
if (defined(vertexBuffer) && !vertexBuffer.isDestroyed() && vertexBuffer.vertexArrayDestroyable) {
vertexBuffer.destroy();
}
}
var indexBuffer = this._indexBuffer;
if (defined(indexBuffer) && !indexBuffer.isDestroyed() && indexBuffer.vertexArrayDestroyable) {
indexBuffer.destroy();
}
if (defined(this._vao)) {
this._context.glDeleteVertexArray(this._vao);
}
return destroyObject(this);
};
export default VertexArray;