/**
 * TSL accessor nodes for Text and BatchedText components.
 * These nodes provide access to text-specific data in shader nodes.
 *
 * These nodes work in both vertex and fragment shaders, similar to
 * Three.js's instanceIndex and vertexIndex. In vertex shaders, they
 * read directly from attributes. In fragment shaders, they automatically
 * use varyings to pass the interpolated values.
 *
 * Raw text-node helpers are internal unless an explicit experimental entry point exports them.
 *
 * @module TextNodes
 */
import type { TSLFloatNode, TSLVec2Node, TSLVec3Node, TSLVec4Node } from '../types/tsl.js';
/**
 * Letter ID as a normalized float (0-1) representing the position
 * of the current glyph within the text. First letter is 0, last letter is 1.
 *
 * Works in both vertex shaders (positionNode) and fragment shaders (colorNode).
 * For BatchedText, this is the letter position within each individual text member.
 *
 * @example
 * import * as THREE from 'three';
 * import { BatchedText, Text } from 'three-blocks/experimental/runtime-sdf-text';
 * import { textDrawId } from 'three-blocks/experimental/runtime-sdf-text';
 * import { uniformArray } from 'three/tsl';
 *
 * const batch = new BatchedText(2, 20);
 * const first = new Text();
 * first.text = 'FIRST';
 * batch.addText(first);
 * const second = new Text();
 * second.text = 'SECOND';
 * batch.addText(second);
 *
 * const colors = uniformArray([
 *   new THREE.Vector3(0.1, 0.4, 1),
 *   new THREE.Vector3(1, 0.2, 0.4),
 * ], 'vec3');
 * batch.material.colorNode = colors.element(textDrawId);
 */
export declare const textLetterId: TSLFloatNode;
/**
 * Draw/member ID as a float. For single Text instances, this is always 0.
 * For BatchedText, this is the index of the text member within the batch.
 *
 * Works in both vertex shaders (positionNode) and fragment shaders (colorNode).
 *
 * This implementation-level API is intentionally internal and has no public package import.
 */
export declare const textDrawId: TSLFloatNode;
/**
 * Glyph UV coordinates as a vec2. These are the UV coordinates
 * within the current glyph's bounding box (0-1 range within the glyph).
 *
 * This implementation-level API is intentionally internal and has no public package import.
 */
export declare const textGlyphUV: TSLVec2Node;
/**
 * Glyph dimensions as a vec2 (width, height) in local units.
 *
 * This implementation-level API is intentionally internal and has no public package import.
 */
export declare const textGlyphDimensions: TSLVec2Node;
/**
 * UV coordinates across the entire text block (0-1 range).
 * This is useful for effects that span the whole text.
 *
 * This implementation-level API is intentionally internal and has no public package import.
 */
export declare const textUV: TSLVec2Node;
/**
 * NDC (Normalized Device Coordinates) position.
 * Only available in screen-space text mode.
 *
 * This implementation-level API is intentionally internal and has no public package import.
 */
export declare const textNdc: TSLVec3Node;
/**
 * Texture channel (0-3) used for the current glyph in the SDF atlas.
 * This is primarily for internal use by the SDF rendering.
 *
 * @type {Node<float>}
 * @category Text
 * @private
 */
export declare const textTextureChannel: TSLFloatNode;
/**
 * Texture UV bounds as a vec4 (startU, startV, endU, endV).
 * This is primarily for internal use by the SDF rendering.
 *
 * @type {Node<vec4>}
 * @category Text
 * @private
 */
export declare const textTextureUVBounds: TSLVec4Node;