/** Floats per rectangle instance (posX, posY, sizeW, sizeH, r, g, b, a, shape). */
export declare const RECT_FLOATS_PER_INSTANCE = 9;
/** Bytes per rectangle instance. */
export declare const RECT_BYTES_PER_INSTANCE: number;
export declare class RectPipeline {
    readonly pipeline: GPURenderPipeline;
    readonly bindGroupLayout: GPUBindGroupLayout;
    private device;
    private instanceBuffer;
    private instanceCapacity;
    private instanceData;
    private instanceCount;
    private constructor();
    /** Create the pipeline with its shader module and bind group layout. */
    static create(device: GPUDevice, format: GPUTextureFormat, _uniformBuffer: GPUBuffer): RectPipeline;
    /** Reset instance count for a new frame. */
    reset(): void;
    /** Push a filled rectangle instance. */
    pushRect(x: number, y: number, w: number, h: number, r: number, g: number, b: number, a: number): void;
    /** Push a filled circle instance (rendered as quad with SDF circle in fragment shader). */
    pushCircle(cx: number, cy: number, radius: number, r: number, g: number, b: number, a: number): void;
    /** Upload instance data to GPU and return the count for draw call. */
    flush(uniformBuffer: GPUBuffer): {
        bindGroup: GPUBindGroup;
        vertexCount: number;
        instanceCount: number;
    } | null;
    /** Release GPU resources. */
    destroy(): void;
    private _pushInstance;
    /** Grow the instance buffer and staging array if needed. */
    private _ensureCapacity;
}