import {
  WebGLRenderer,
  WebGLRenderTarget,
  Texture,
  DataTexture,
  Material,
  ShaderMaterial,
  Wrapping,
  TextureFilter,
  TextureDataType,
  IUniform,
} from 'three'

export interface Variable {
  name: string
  initialValueTexture: Texture
  material: ShaderMaterial
  dependencies: Variable[]
  renderTargets: WebGLRenderTarget[]
  wrapS: number
  wrapT: number
  minFilter: number
  magFilter: number
}

export class GPUComputationRenderer {
  constructor(sizeX: number, sizeY: number, renderer: WebGLRenderer)

  setDataType(type: TextureDataType): void

  addVariable(variableName: string, computeFragmentShader: string, initialValueTexture: Texture): Variable
  setVariableDependencies(variable: Variable, dependencies: Variable[] | null): void

  init(): string | null
  compute(): void

  getCurrentRenderTarget(variable: Variable): WebGLRenderTarget
  getAlternateRenderTarget(variable: Variable): WebGLRenderTarget
  addResolutionDefine(materialShader: ShaderMaterial): void
  createShaderMaterial(computeFragmentShader: string, uniforms?: { [uniform: string]: IUniform }): ShaderMaterial
  createRenderTarget(
    sizeXTexture: number,
    sizeYTexture: number,
    wrapS: Wrapping,
    wrapT: number,
    minFilter: TextureFilter,
    magFilter: TextureFilter,
  ): WebGLRenderTarget
  createTexture(): DataTexture
  renderTexture(input: Texture, output: Texture): void
  doRenderTarget(material: Material, output: WebGLRenderTarget): void
  dispose(): void
}