@thi.ng/shader-ast-stdlib/noise/fbm.d.ts

Function collection for modular GPGPU / shader programming with @thi.ng/shader-ast

/**
 * Higher order function to compute 3D texture-based FBM noise for given number
 * of octaves and decay factor (default: 1/octaves). Returns a 2-arg shader
 * function, taking a sampler3D and vec3 position and which returns summed noise
 * value as vec4.
 *
 * @remarks
 * Not compatible with WebGL 1.0 (texture type not natively supported).
 *
 * The texture should be configured to use linear filtering and texture repeat
 * mode.
 *
 * Using thi.ng/webgl (for example), the 3D noise texture can be initialized as
 * follows:
 *
 * @example
 * ```ts
 * import { repeatedly } from "@thi.ng/transducers";
 * import {
 *   defTexture,
 *   TextureFilter, TextureFormat, TextureRepeat, TextureTarget
 * } from "@thi.ng/webgl";
 *
 * // (GL context creation omitted here)
 *
 * const noiseTex = defTexture(gl, {
 *   width: 32,
 *   height: 32,
 *   depth: 32,
 *   target: TextureTarget.TEXTURE_3D,
 *   format: TextureFormat.RGB,
 *   filter: TextureFilter.LINEAR,
 *   wrap: TextureRepeat.REPEAT,
 *   image: new Uint8Array(
 *     repeatedly(() => Math.random() * 255.5, 32 * 32 * 32 * 3)
 *   )
 * });
 * ```
 *
 * @param octaves
 * @param decay
 */
export declare const fbmNoiseVec34: (octaves: number, decay?: number) => import("@thi.ng/shader-ast").TaggedFn2<"sampler3D", "vec3", "vec4">;
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