import { type ProcessApproachEnum } from '../definitions/ProcessApproach';
/**
 * Global engine state object that holds various runtime configuration and state information.
 * This object contains engine-wide settings that affect rendering behavior and performance.
 */
export declare class EngineState {
    /**
     * The current process approach being used for rendering operations.
     * Determines whether to use WebGL2 uniform approach, data texture approach, WebGPU, or none.
     */
    currentProcessApproach: ProcessApproachEnum;
    /**
     * The aspect ratio of the current viewport (width / height).
     * Used for camera projection calculations and responsive rendering.
     * @default 0
     */
    viewportAspectRatio: number;
    /**
     * Flag indicating whether WebGPU render bundle mode is enabled.
     * Render bundles can improve performance by pre-recording rendering commands.
     * @default false
     */
    webgpuRenderBundleMode: boolean;
    /**
     * Total size in bytes of GPU shader data storage, excluding morph target data.
     * Used for memory management and optimization of GPU resource allocation.
     * @default 0
     */
    totalSizeOfGPUShaderDataStorageExceptMorphData: number;
    xrPoseWebGPU?: XRViewerPose;
    xrGpuBinding?: any;
    xrProjectionLayerWebGPU?: XRLayer;
}