@itwin/core-frontend/lib/cjs/internal/render/webgl/BatchState.d.ts

iTwin.js frontend components

/** @packageDocumentation
 * @module WebGL
 */
import { Id64String } from "@itwin/core-bentley";
import { ModelFeature } from "@itwin/core-common";
import { IModelConnection } from "../../../IModelConnection";
import { BranchStack } from "./BranchStack";
import { Batch } from "./Graphic";
/**
 * Assigns a transient, unique 32-bit integer ID to each Batch in a RenderCommands.
 * A batch ID of 0 means "no batch".
 * The first batch gets batch ID of 1.
 * The next batch gets the previous batch's ID plus the number of features in the previous batch's feature table
 * (or 1, if empty feature table).
 * The IDs are set temporarily as members on the Batch objects and reset to 0 immediately after rendering.
 * The currentBatch member identifies the batch containing primitives currently being drawn.
 * The combination of the current batch's ID (passed as uniform to shader) and the index of a given Feature within
 * its batch's FeatureTable (stored in vertex table) produce a unique ID for every feature rendered during a frame.
 * During rendering, the feature IDs are written to the "feature ID" color attachment.
 * The batch IDs remain valid during a call to Target.readPixels() so that they can be used to extract
 * Features from the Batch's FeatureTables.
 * @internal
 */
export declare class BatchState {
    private readonly _stack;
    private _batches;
    private _curBatch?;
    constructor(stack: BranchStack);
    get currentBatch(): Batch | undefined;
    get currentBatchId(): number;
    get currentBatchIModel(): IModelConnection | undefined;
    get isEmpty(): boolean;
    push(batch: Batch, allowAdd: boolean): void;
    pop(): void;
    reset(): void;
    private static readonly _scratchElementIdPair;
    getElementId(featureId: number): Id64String;
    getFeature(featureId: number, result: ModelFeature): ModelFeature | undefined;
    get numFeatureIds(): number;
    get numBatches(): number;
    findBatchId(featureId: number): number;
    get nextBatchId(): number;
    private getBatchId;
    private indexOf;
    find(featureId: number): Batch | undefined;
}
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