import { GraphicsDevice } from 'playcanvas';
import { type RenderCamera } from './camera';
import { DataTable } from '../data-table';
/**
 * Max gaussians per GPU dispatch. Bounds per-render input/projection
 * buffer sizes and the granularity of the depth-ordered chunked path.
 *
 * Each chunk dispatches its own project + rasterize-accumulate.
 * Running state persists across chunks; saturated pixels (T < 1e-4)
 * short-circuit on subsequent chunks via the rasterize shader's T
 * early-out.
 */
declare const CHUNK_CAP = 200000;
interface BackgroundRGBA {
    r: number;
    g: number;
    b: number;
    a: number;
}
/**
 * Render a splat scene to an RGBA byte buffer.
 *
 * Whole-image pipeline:
 *
 *   1. Linear frustum cull — one pass over all splats, testing each
 *      centre against the camera frustum in camera-space. No BVH or
 *      per-splat AABB precomputation.
 *   2. Sort visible splats globally by camera-space z (front-to-back).
 *   3. Split image into a grid of sub-frames (each ≤ MAX_SUB_FRAME_TILES
 *      in either dimension) and render each independently. The rasterizer
 *      retains its per-sub-frame running state; the project shader's
 *      group-AABB cull skips splats outside the current sub-frame. The
 *      CPU depth sort is global, so depth ordering is consistent across
 *      sub-frames and there are no boundary seams.
 *
 * Per-chunk (GPU tile-bin pipeline, fully GPU-resident): project (writes
 * per-splat tile coverage) → prefix-sum (writes emitOffsets + totalPairs)
 * → emit-pairs → prepare-indirect → radix sortIndirect (key + value:
 * tile keys sorted, splat indices reordered) → init-tile-offsets →
 * find-boundaries (atomicMin) → rasterize each tile's slice in depth
 * order. No per-chunk CPU readbacks.
 *
 * @param device - PlayCanvas WebGPU graphics device.
 * @param dataTable - Gaussian splat data in PlayCanvas-identity space.
 * @param camera - Camera parameters.
 * @param background - RGBA background composited under residual transmittance.
 * @returns RGBA byte array of length `camera.width × camera.height × 4`.
 */
declare const renderRasterPass: (device: GraphicsDevice, dataTable: DataTable, camera: RenderCamera, background: BackgroundRGBA) => Promise<Uint8Array>;
export { renderRasterPass, CHUNK_CAP };