import { ShaderProgramOptions } from '../resources';
/**
 * A shader code snippet
 *
 * @public
 */
export declare type ShaderChunk = string;
/**
 * A map of shader code snippets
 *
 * @public
 */
export interface ShaderChunkSet<T = void> {
    [key: string]: ShaderChunk;
}
/**
 * A map of `#define` statements for a shader
 *
 * @public
 * @remarks
 * - Use `true` values to indicate a simple define statement: `#define KEY`
 * - Use `false`, `null`, `undefined` to indicate absence of a define statement
 * - Use other values to indicate a define statement with value: `#define KEY VALUE`
 *
 * Example:
 * ```
 * const defines: ShaderDefines = { foo: true, bar: null, baz: 1234 }
 * ```
 *
 * will be interpreted as
 * ```
 * #define foo
 * #define baz 1234
 * ```
 */
export interface ShaderDefines {
    [key: string]: any;
}
/**
 * Combines a set of shader chunks into a single shader source file
 *
 * @public
 * @param base - The initial chunk to process
 * @param chunks - A map of available shader chunks to include
 * @param defines - A map of shader defines to include
 */
export declare function assembleShader(base: string, chunks: ShaderChunkSet[], defines?: ShaderDefines): string;
/**
 * Combines a set of shader chunks into `vertexShader` and `fragmentShader` source files
 *
 * @public
 * @param base - The initial chunk to process
 * @param chunks - A map of available shader chunks to include
 * @param defines - A map of shader defines to include
 */
export declare function assembleProgram(base: string, chunks: ShaderChunkSet[], defines?: ShaderDefines): ShaderProgramOptions;
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