export interface RgbColor {
    r: number;
    g: number;
    b: number;
}
export declare function clampOpacity(value: number): number;
export declare function compileShader(gl: WebGLRenderingContext | WebGL2RenderingContext, type: number, source: string): WebGLShader | null;
/**
 * Links a program and releases both shaders (they stay attached to the program).
 * Returns null on any failure — the caller decides whether to fall back.
 */
export declare function linkProgram(gl: WebGLRenderingContext | WebGL2RenderingContext, vertex: WebGLShader, fragment: WebGLShader): WebGLProgram | null;
export declare function parseCssColor(value: string, fallback: RgbColor): RgbColor;
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