export interface GPUTextureHandle {
    texture: GPUTexture;
    view: GPUTextureView;
    sampler: GPUSampler;
}
/** Returns a cached 1x1 white texture (avoids needing separate pipeline variants). */
export declare function getWhiteFallbackTexture(device: GPUDevice): GPUTextureHandle;
/** Create a GPU texture from raw RGBA pixel data with auto-generated mipmaps.
 *  @param srgb If true (default), uses rgba8unorm-srgb so sRGB-encoded images
 *              are correctly decoded to linear on GPU read. Pass false for
 *              linear data textures (normal maps, metallic-roughness maps). */
export declare function createTextureFromRGBA(device: GPUDevice, data: Uint8Array, width: number, height: number, srgb?: boolean): GPUTextureHandle;
/** Returns a cached 1x1 flat normal texture (127,127,255,255 = tangent-space up). */
export declare function getFlatNormalFallback(device: GPUDevice): GPUTextureHandle;
/** Returns a cached 1x1 white metallic-roughness fallback (uniform values override). */
export declare function getDefaultMetallicRoughnessFallback(device: GPUDevice): GPUTextureHandle;
/** Decode an image blob to RGBA pixel data using createImageBitmap. */
export declare function decodeImageToRGBA(blob: Blob): Promise<{
    data: Uint8Array;
    width: number;
    height: number;
}>;
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