molstar
Version:
A comprehensive macromolecular library.
65 lines (64 loc) • 2.39 kB
JavaScript
/**
* Copyright (c) 2018-2021 mol* contributors, licensed under MIT, See LICENSE file for more info.
*
* @author Alexander Rose <alexander.rose@weirdbyte.de>
*/
import { idFactory } from '../../mol-util/id-factory';
var getNextVertexArrayId = idFactory();
function getVertexArray(extensions) {
var vertexArrayObject = extensions.vertexArrayObject;
if (!vertexArrayObject) {
throw new Error('VertexArrayObject not supported');
}
var vertexArray = vertexArrayObject.createVertexArray();
if (!vertexArray) {
throw new Error('Could not create WebGL vertex array');
}
return vertexArray;
}
function getVertexArrayObject(extensions) {
var vertexArrayObject = extensions.vertexArrayObject;
if (vertexArrayObject === null) {
throw new Error('VertexArrayObject not supported');
}
return vertexArrayObject;
}
export function createVertexArray(gl, extensions, program, attributeBuffers, elementsBuffer) {
var id = getNextVertexArrayId();
var vertexArray = getVertexArray(extensions);
var vertexArrayObject = getVertexArrayObject(extensions);
function update() {
vertexArrayObject.bindVertexArray(vertexArray);
if (elementsBuffer)
elementsBuffer.bind();
program.bindAttributes(attributeBuffers);
vertexArrayObject.bindVertexArray(null);
}
update();
var destroyed = false;
return {
id: id,
bind: function () {
vertexArrayObject.bindVertexArray(vertexArray);
},
update: update,
reset: function () {
vertexArray = getVertexArray(extensions);
vertexArrayObject = getVertexArrayObject(extensions);
update();
},
destroy: function () {
if (destroyed)
return;
if (elementsBuffer) {
// workaround for ANGLE/Chromium bug
// - https://bugs.chromium.org/p/angleproject/issues/detail?id=6599
// - https://bugs.chromium.org/p/chromium/issues/detail?id=1272238
vertexArrayObject.bindVertexArray(vertexArray);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
}
vertexArrayObject.deleteVertexArray(vertexArray);
destroyed = true;
}
};
}