/**
 * gpu-verify — the render-verification gate for the native render path (D.083, task 2h3s).
 *
 * The pre-mortem's irreducible risk: WebGPU can't be unit-tested in Node, and a Node-green
 * suite "passing" while rendering nothing is the green-on-black trap (W.667/W.684). This is
 * the gate that closes it: render a real frame to an offscreen texture on a LIVE GPUDevice
 * and read the pixels BACK — an actual pixel, not a mock. Callers MUST gate on a live device
 * (e.g. gpu-setup's GPU_LIVE); on a mock/no-GPU host the render test skips, never false-passes.
 *
 * Zero foreign-engine deps (no three.js) — straight WebGPU + WGSL. The Inc-2 GPU backend
 * verifies its real .holo scene render through this same readback path.
 */
export interface PixelGrid {
    width: number;
    height: number;
    /** RGBA bytes, row-major, length = width*height*4. */
    data: Uint8Array;
}
/** Read one RGBA pixel as a 4-tuple. */
export declare function pixelAt(grid: PixelGrid, x: number, y: number): [number, number, number, number];
/**
 * Render a single solid-color full-viewport triangle to an offscreen rgba8unorm texture and
 * read the pixels back. The minimal proof that the native WebGPU render→readback path works
 * end-to-end on a real device. `size` defaults to 64 so bytesPerRow = 64*4 = 256 (the required
 * copyTextureToBuffer alignment) with no padding math.
 *
 * @param device  a LIVE GPUDevice (mock devices will not produce real pixels — gate on GPU_LIVE).
 * @param color   RGBA in 0..1.
 */
export declare function renderSolidColor(device: GPUDevice, color?: [number, number, number, number], size?: number): Promise<PixelGrid>;
//# sourceMappingURL=gpu-verify.d.ts.map