/**
 * MaterialSystem.ts
 *
 * PBR material management: shader binding, uniform management,
 * render state, and instanced variants.
 *
 * @module rendering
 */
export type BlendMode = 'opaque' | 'alpha' | 'additive' | 'multiply';
export type CullMode = 'none' | 'front' | 'back';
export type UniformType = 'float' | 'vec2' | 'vec3' | 'vec4' | 'mat4' | 'int' | 'sampler2D';
export interface UniformDef {
    name: string;
    type: UniformType;
    value: number | number[] | string;
}
export interface Material {
    id: string;
    name: string;
    shaderId: string;
    uniforms: Map<string, UniformDef>;
    blendMode: BlendMode;
    cullMode: CullMode;
    depthWrite: boolean;
    depthTest: boolean;
    renderOrder: number;
    doubleSided: boolean;
    albedo: [number, number, number, number];
    metallic: number;
    roughness: number;
    emissive: [number, number, number];
    normalScale: number;
}
export declare class MaterialSystem {
    private materials;
    private shaders;
    registerShader(id: string, vertexSrc: string, fragmentSrc: string): void;
    getShader(id: string): {
        vertexSrc: string;
        fragmentSrc: string;
    } | undefined;
    createMaterial(id: string, name: string, shaderId: string): Material;
    getMaterial(id: string): Material | undefined;
    removeMaterial(id: string): void;
    getMaterialCount(): number;
    setUniform(materialId: string, name: string, type: UniformType, value: number | number[] | string): void;
    getUniform(materialId: string, name: string): UniformDef | undefined;
    setPBR(materialId: string, props: Partial<Pick<Material, 'albedo' | 'metallic' | 'roughness' | 'emissive' | 'normalScale'>>): void;
    setBlendMode(materialId: string, mode: BlendMode): void;
    setCullMode(materialId: string, mode: CullMode): void;
    getSortedMaterials(): Material[];
    cloneMaterial(sourceId: string, newId: string, newName: string): Material | null;
}
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