playcanvas/build/playcanvas/src/platform/graphics/dynamic-buffer.js

PlayCanvas WebGL game engine

import { BindGroupFormat, BindUniformBufferFormat } from './bind-group-format.js';
import { BindGroup } from './bind-group.js';
import { UNIFORM_BUFFER_DEFAULT_SLOT_NAME, SHADERSTAGE_VERTEX, SHADERSTAGE_FRAGMENT } from './constants.js';

class DynamicBuffer {
		constructor(device){
				this.bindGroupCache = new Map();
				this.device = device;
				this.bindGroupFormat = new BindGroupFormat(this.device, [
						new BindUniformBufferFormat(UNIFORM_BUFFER_DEFAULT_SLOT_NAME, SHADERSTAGE_VERTEX | SHADERSTAGE_FRAGMENT)
				]);
		}
		getBindGroup(ub) {
				const ubSize = ub.format.byteSize;
				let bindGroup = this.bindGroupCache.get(ubSize);
				if (!bindGroup) {
						bindGroup = new BindGroup(this.device, this.bindGroupFormat, ub);
						bindGroup.update();
						this.bindGroupCache.set(ubSize, bindGroup);
				}
				return bindGroup;
		}
}

export { DynamicBuffer };