56 lines
1.8 KiB
TypeScript
56 lines
1.8 KiB
TypeScript
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import type {StructArray} from '../util/struct_array';
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import type {TriangleIndexArray, LineIndexArray, LineStripIndexArray} from '../data/index_array_type';
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import type {Context} from '../gl/context';
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/**
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* @internal
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* an index buffer class
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*/
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export class IndexBuffer {
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context: Context;
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buffer: WebGLBuffer;
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dynamicDraw: boolean;
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constructor(context: Context, array: TriangleIndexArray | LineIndexArray | LineStripIndexArray, dynamicDraw?: boolean) {
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this.context = context;
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const gl = context.gl;
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this.buffer = gl.createBuffer();
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this.dynamicDraw = Boolean(dynamicDraw);
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// The bound index buffer is part of vertex array object state. We don't want to
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// modify whatever VAO happens to be currently bound, so make sure the default
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// vertex array provided by the context is bound instead.
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this.context.unbindVAO();
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context.bindElementBuffer.set(this.buffer);
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gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, array.arrayBuffer, this.dynamicDraw ? gl.DYNAMIC_DRAW : gl.STATIC_DRAW);
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if (!this.dynamicDraw) {
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array.freeBufferAfterUpload();
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}
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}
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bind() {
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this.context.bindElementBuffer.set(this.buffer);
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}
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updateData(array: StructArray) {
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const gl = this.context.gl;
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if (!this.dynamicDraw) throw new Error('Attempted to update data while not in dynamic mode.');
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// The right VAO will get this buffer re-bound later in VertexArrayObject.bind
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// See https://github.com/mapbox/mapbox-gl-js/issues/5620
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this.context.unbindVAO();
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this.bind();
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gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, array.arrayBuffer);
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}
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destroy() {
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const gl = this.context.gl;
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if (this.buffer) {
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gl.deleteBuffer(this.buffer);
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delete this.buffer;
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}
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}
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}
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