import { CodeGenFn, ModuleRegistry } from "wgsl-linker";
/** code generator or template to create wgsl that load a value from vec4 */
export type LoadComponent = LoadTemplate | LoadCodeGen;
/** wgsl template for loading a value from a wgsl vec4 */
export interface LoadTemplate {
    kind: "template";
    wgsl: string;
}
/** code gen function to generate wgsl for loading a value from a wgsl vec4 */
export interface LoadCodeGen {
    kind: "function";
    fn: CodeGenFn;
}
export type ComponentName = "r" | "g" | "b" | "a";
/**
 * A function to generate wgsl to load a value from a texel.
 * @param component - the component to load from the texture e.g. "r" or "a"
 * @param outputParams - the number of elements in the output struct
 * The wgsl importer should pass two paramaters:
 *  . "output" defining the output type e.g. f32
 *  . "texelType" defining the type of the input texture (e.g. "f32").
 */
export declare function loadTexelCodeGen(component: ComponentName, outputParams?: number): LoadCodeGen;
/**
 * @return a function or template to generate wgsl to load a value from a texel
 *
 * @param texelComponent - the component name to load from the texture e.g. "r" or "a",
 *  (or an already defined generator function or wgsl template which is just passed through)
 */
export declare function texelLoader(texelComponent: ComponentName | LoadComponent): LoadComponent;
export declare function registerTexelLoader(texelComponent: ComponentName | LoadComponent, registry: ModuleRegistry): void;