import type { GpuBuffer, GpuContext, GpuTexture } from "./types.js";
export interface ReadTextureOptions extends Pick<GPUTexelCopyTextureInfo, "mipLevel"> {
    /** Region origin. Defaults to 0. */
    x?: number;
    /** Region origin. Defaults to 0. */
    y?: number;
    /** Region size. Defaults to the mip level's width. */
    width?: number;
    /** Region size. Defaults to the mip level's height. */
    height?: number;
    /** Array layer or cube face to read from. */
    layer?: number;
}
/**
 * Asynchronously read pixels back from a texture (eg. for picking). The source
 * needs a `usage` including COPY_SRC. Compressed formats read back as their raw
 * block bytes, the region rounded out to whole blocks.
 *
 * ```js
 * const [r, g, b, a] = await gpu.readTexture(ctx, pickingTexture, {
 *   x,
 *   y,
 *   width: 1,
 *   height: 1,
 * });
 * ```
 */
export declare function readTexture(ctx: GpuContext, source: GpuTexture, options?: ReadTextureOptions): Promise<Uint8Array>;
/**
 * Asynchronously read a buffer back to the CPU.
 *
 * ```js
 * const data = new Float32Array(await gpu.readBuffer(ctx, particleBuffer));
 * ```
 */
export declare function readBuffer(ctx: GpuContext, source: GpuBuffer, byteOffset?: number, byteLength?: number): Promise<ArrayBuffer>;
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