import { type InitializationData, type SmartFilter } from "../smartFilter.js";
/**
 * The render target generator is responsible for creating and assigning render targets to ShaderBlocks.
 */
export declare class RenderTargetGenerator {
    private _optimize;
    private _renderTargetPool;
    private _textureOptionsHashCache;
    private _numTargetsCreated;
    /**
     * Creates a new render target generator.
     * @param optimize - If true, the render target generator will try to reuse render targets as much as possible.
     */
    constructor(optimize?: boolean);
    /**
     * Returns the number of render targets created by the process
     */
    get numTargetsCreated(): number;
    /**
     * Sets the output textures for the ShaderBlocks of the smart filter.
     * @param smartFilter - The smart filter to generate the render targets for.
     * @param initializationData - The initialization data to use.
     */
    setOutputTextures(smartFilter: SmartFilter, initializationData: InitializationData): void;
    private _findAvailableTexture;
    private _getTexture;
    private _releaseTexture;
    /**
     * Creates an offscreen texture to hold on the result of the block rendering.
     * @param runtime - The current runtime we create the texture for
     * @param smartFilter - The smart filter the texture is created for
     * @param textureOptions - The options to use to create the texture
     * @returns The render target texture
     */
    private _createTexture;
    /**
     * Gets a textureOptionsHash for a block, using a cache to avoid recomputing it.
     * @param block - The block to get the texture options hash for
     * @returns The texture options hash for the block
     */
    private _getTextureOptionsHash;
}
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