import type { GPUTextureHandle } from './texture.js';
import type { ShaderType } from './material-asset.js';
export interface MaterialParams {
    albedo?: [number, number, number, number];
    metallic?: number;
    roughness?: number;
    albedoTexture?: GPUTextureHandle;
    emissive?: [number, number, number];
    emissiveIntensity?: number;
    normalTexture?: GPUTextureHandle;
    metallicRoughnessTexture?: GPUTextureHandle;
    splatSharpness?: number;
    /** Fragments with alpha below this value are discarded. 0 = no cutoff. */
    alphaCutoff?: number;
    texTilingX?: number;
    texTilingY?: number;
}
export interface Material {
    albedo: Float32Array;
    metallic: number;
    roughness: number;
    emissive: Float32Array;
    emissiveIntensity: number;
    /** Terrain splat sharpness exponent (1 = linear, higher = sharper). Default 1. */
    splatSharpness: number;
    /** Fragments with alpha below this value are discarded. 0 = no cutoff. */
    alphaCutoff: number;
    texTilingX: number;
    texTilingY: number;
    dirty: boolean;
    uniformBuffer: GPUBuffer | null;
    bindGroup: GPUBindGroup | null;
    albedoTexture: GPUTextureHandle | null;
    normalTexture: GPUTextureHandle | null;
    metallicRoughnessTexture: GPUTextureHandle | null;
    textureVersion: number;
    /** Shader type for this material. Default 'pbr'. */
    shaderType: ShaderType;
    /** Path to custom .wgsl fragment shader (when shaderType === 'custom'). */
    customShaderPath: string | null;
    /** GPU buffer for custom shader uniforms. */
    customUniformBuffer: GPUBuffer | null;
    /** CPU-side data for custom shader uniforms. */
    customUniformData: Float32Array | null;
    /** Texture handles keyed by @texture name. */
    customTextures: Map<string, GPUTextureHandle>;
    /** Whether custom uniform data needs upload. */
    customDirty: boolean;
}
/**
 * Bytes: vec4 albedo(16) + f32 metallic(4) + f32 roughness(4) + 8B pad
 *      + vec4 emissive(16: rgb + intensity in w)
 *      + vec2 texTiling(8) + 8B pad = 64
 */
export declare const MATERIAL_UNIFORM_SIZE = 64;
export declare function createMaterial(params?: MaterialParams): Material;
/**
 * Write material uniforms into a Float32Array for GPU upload.
 * Layout: [albedo(4), metallic, roughness, splatSharpness, alphaCutoff,
 *          emissive.rgb(3), emissiveIntensity, texTilingX, texTilingY, pad, pad]
 */
export declare function writeMaterialUniforms(out: Float32Array, mat: Material): void;
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