/// <reference types="@webgpu/types" />
import { HasReactive } from "@reactively/decorate";
import { Cache, ComposableShader, ValueOrFn, Vec2 } from "thimbleberry";
import { HistogramModule } from "../binop/HistogramModule.js";
import { ComponentName, LoadComponent } from "../util/GenerateLoadTexel.js";
export interface TextureToHistogramsParams {
    device: GPUDevice;
    /**
     * Source data to be bucketed in a histogram
     *
     * A function returning the source buffer will be executed lazily,
     * and reexecuted if the function's `@reactively` source values change.
     */
    source: ValueOrFn<GPUTexture>;
    /**
     * range of values
     *
     * A function returning the source buffer will be executed lazily,
     * and reexecuted if the function's `@reactively` source values change.
     */
    minMaxBuffer: ValueOrFn<GPUBuffer>;
    /** {@inheritDoc TextureToHistograms#histogramOps} */
    histogramOps: HistogramModule;
    /** {@inheritDoc TextureToHistograms#blockSize} */
    blockSize?: Vec2;
    /** {@inheritDoc TextureToHistograms#forceWorkgroupSize} */
    forceWorkgroupSize?: Vec2;
    /** {@inheritDoc TextureToHistograms#sourceComponent} */
    sourceComponent?: ComponentName | LoadComponent;
    /** cache for GPUComputePipeline */
    pipelineCache?: <T extends object>() => Cache<T>;
    /** {@inheritDoc TextureToHistograms#bucketSums} */
    bucketSums?: boolean;
    /** {@inheritDoc TextureToHistograms#saturateMax} */
    saturateMax?: boolean;
    /** {@inheritDoc TextureToHistograms#label} */
    label?: string;
}
/** calc histograms from gpu texture
 * Each workgroup thread reads a blockSize group of elements to one histogram,
 * and each dispatch reduces the workgroup histograms to one histogram.
 * The result is a buffer of histograms, one per dispatched workgroup.
 * (The resulting histogram buffer should be reduced to one histogram via ReduceBuffer)
 */
export declare class TextureToHistograms extends HasReactive implements ComposableShader {
    /** Source texture to be counted in a histogram */
    source: GPUTexture;
    /** range of values to consider in histogram */
    minMaxBuffer: GPUBuffer;
    /** macros to customize wgsl shader for size of data and size of histogram */
    histogramOps: HistogramModule;
    /** select or synthesize a component (e.g. r,g,b,a) from the source texture */
    sourceComponent: ComponentName | LoadComponent;
    /** calculate sums for each bucket */
    bucketSums: boolean;
    /** include values > max range in last bucket */
    saturateMax: boolean;
    /** Debug label attached to gpu objects for error reporting */
    label?: string;
    /** number of elements to reduce in each invocation (4) */
    blockSize: Vec2;
    /** Override to set compute workgroup size e.g. for testing. */
    forceWorkgroupSize: Vec2;
    private device;
    private pipelineCache?;
    private usageContext;
    constructor(params: TextureToHistogramsParams);
    commands(commandEncoder: GPUCommandEncoder): void;
    destroy(): void;
    /** histogram bucket counts */
    get histogramsResult(): GPUBuffer;
    /** histogram bucket sums */
    get sumsResult(): GPUBuffer;
    /** number of elements in the result buffer */
    get resultElems(): number;
    get debugBuffer(): GPUBuffer;
    private get registry();
    private pipeline;
    private get uniformBuffer();
    private get dispatchSize();
    private get workgroupSize();
    private bindGroup;
}