import type { WebGLContextManager } from "./context-manager";
type GL = WebGL2RenderingContext | WebGLRenderingContext;
export interface Instancing {
    setDivisor(location: number, divisor: number): void;
    drawArraysInstanced(mode: number, first: number, count: number, instances: number): void;
}
/**
 * Return an Instancing helper for the given GL context. On WebGL2, native
 * `vertexAttribDivisor`/`drawArraysInstanced` are used; on WebGL1 the
 * ANGLE_instanced_arrays extension is looked up and cached by caller.
 * Negative attribute locations (optimized-out attributes) are tolerated by
 * `setDivisor` and ignored.
 */
export declare function getInstancing(glManager: WebGLContextManager): Instancing;
/**
 * Allocate the static `[0, 1, 2, 3]` line-strip corner buffer used by
 * every instanced line/wick glyph: each corner index is multiplied by
 * `LINE_WIDTH_PX` in the shader to expand a 2-vertex segment into a
 * `TRIANGLE_STRIP` quad. Identical contents across all callers; one
 * helper avoids the four-way `createBuffer` / `bufferData` boilerplate.
 */
export declare function createLineCornerBuffer(gl: GL): WebGLBuffer;
/**
 * Allocate the static `[(0,0), (1,0), (0,1), (1,1)]` quad-strip corner
 * buffer used by instanced rect glyphs (candlestick body). Used as a
 * `vec2 a_corner` attribute that the shader scales by per-instance
 * width/height to expand into a `TRIANGLE_STRIP` rect.
 */
export declare function createQuadCornerBuffer(gl: GL): WebGLBuffer;
/**
 * Bind a per-instance float attribute from a named buffer in the buffer
 * pool. Returns `true` when the bind happened, `false` when the buffer
 * has not yet been allocated (caller should skip the draw rather than
 * paint zero data). No-op return `true` when `attr` is negative
 * (optimized-out attribute — drawing the rest is still valid).
 *
 * Render-path uses `peek`, never `getOrCreate`: the latter recreates
 * with zero-initialized contents when `_totalCapacity` has grown past
 * the current buffer, which would wipe the previous draw's vertex
 * data and leave `drawArraysInstanced` to render zeros. See
 * {@link BufferPool#peek} for the full rationale.
 */
export declare function bindInstancedFloatAttr(glManager: WebGLContextManager, instancing: Instancing, attr: number, name: string, components: number): boolean;
export {};