/**
 * Backend-neutral primitive topologies.
 *
 * Names how a stream of vertices is assembled into primitives, in the GPU
 * vocabulary rather than the GL one. Like {@link VertexFormat}, this lets a
 * draw be described without a live rendering context, and lets a backend read
 * the description directly instead of translating enums.
 *
 * This module holds no GL references, so a non-WebGL backend can import it
 * without pulling in the WebGL layer.
 */
/**
 * How vertices are assembled into primitives.
 *
 * Five of these are portable across backends. `"line-loop"` and
 * `"triangle-fan"` are **engine extensions** with no modern GPU-API
 * equivalent — they exist because the primitive batcher has always accepted
 * them, and a future backend will have to emulate them (a line loop is a line
 * strip plus a closing segment, which is already how the WebGL path draws it).
 * Prefer {@link PORTABLE_TOPOLOGIES} for anything that must survive a backend
 * change.
 */
export type Topology = "point-list" | "line-list" | "line-strip" | "line-loop" | "triangle-list" | "triangle-strip" | "triangle-fan";
/**
 * The topologies with a direct equivalent in modern GPU APIs.
 *
 * `"line-loop"` and `"triangle-fan"` are deliberately absent — see
 * {@link Topology}.
 */
export declare const PORTABLE_TOPOLOGIES: readonly ["point-list", "line-list", "line-strip", "triangle-list", "triangle-strip"];
/**
 * Whether a value is a supported topology name.
 * @param value - the value to test
 * @returns `true` when `value` names a topology
 */
export declare function isTopology(value: unknown): value is Topology;
/**
 * Whether a topology has a direct equivalent in modern GPU APIs.
 * @param topology - the topology to test
 * @returns `false` for the two engine extensions, which a non-WebGL backend must emulate
 */
export declare function isPortableTopology(topology: Topology): boolean;
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