import { SAMPLER_TYPES, TYPES, MIPMAP_MODES, WRAP_MODES, SCALE_MODES } from "@pixi/constants";
import { ExtensionType, extensions } from "@pixi/extensions";
import { removeItems } from "@pixi/utils";
import { BaseTexture } from "./BaseTexture.mjs";
import { GLTexture } from "./GLTexture.mjs";
import { mapInternalFormatToSamplerType } from "./utils/mapInternalFormatToSamplerType.mjs";
import { mapTypeAndFormatToInternalFormat } from "./utils/mapTypeAndFormatToInternalFormat.mjs";
class TextureSystem {
  /**
   * @param renderer - The renderer this system works for.
   */
  constructor(renderer) {
    this.renderer = renderer, this.boundTextures = [], this.currentLocation = -1, this.managedTextures = [], this._unknownBoundTextures = !1, this.unknownTexture = new BaseTexture(), this.hasIntegerTextures = !1;
  }
  /** Sets up the renderer context and necessary buffers. */
  contextChange() {
    const gl = this.gl = this.renderer.gl;
    this.CONTEXT_UID = this.renderer.CONTEXT_UID, this.webGLVersion = this.renderer.context.webGLVersion, this.internalFormats = mapTypeAndFormatToInternalFormat(gl), this.samplerTypes = mapInternalFormatToSamplerType(gl);
    const maxTextures = gl.getParameter(gl.MAX_TEXTURE_IMAGE_UNITS);
    this.boundTextures.length = maxTextures;
    for (let i = 0; i < maxTextures; i++)
      this.boundTextures[i] = null;
    this.emptyTextures = {};
    const emptyTexture2D = new GLTexture(gl.createTexture());
    gl.bindTexture(gl.TEXTURE_2D, emptyTexture2D.texture), gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(4)), this.emptyTextures[gl.TEXTURE_2D] = emptyTexture2D, this.emptyTextures[gl.TEXTURE_CUBE_MAP] = new GLTexture(gl.createTexture()), gl.bindTexture(gl.TEXTURE_CUBE_MAP, this.emptyTextures[gl.TEXTURE_CUBE_MAP].texture);
    for (let i = 0; i < 6; i++)
      gl.texImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
    gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MAG_FILTER, gl.LINEAR), gl.texParameteri(gl.TEXTURE_CUBE_MAP, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
    for (let i = 0; i < this.boundTextures.length; i++)
      this.bind(null, i);
  }
  /**
   * Bind a texture to a specific location
   *
   * If you want to unbind something, please use `unbind(texture)` instead of `bind(null, textureLocation)`
   * @param texture - Texture to bind
   * @param [location=0] - Location to bind at
   */
  bind(texture, location = 0) {
    const { gl } = this;
    if (texture = texture?.castToBaseTexture(), texture?.valid && !texture.parentTextureArray) {
      texture.touched = this.renderer.textureGC.count;
      const glTexture = texture._glTextures[this.CONTEXT_UID] || this.initTexture(texture);
      this.boundTextures[location] !== texture && (this.currentLocation !== location && (this.currentLocation = location, gl.activeTexture(gl.TEXTURE0 + location)), gl.bindTexture(texture.target, glTexture.texture)), glTexture.dirtyId !== texture.dirtyId ? (this.currentLocation !== location && (this.currentLocation = location, gl.activeTexture(gl.TEXTURE0 + location)), this.updateTexture(texture)) : glTexture.dirtyStyleId !== texture.dirtyStyleId && this.updateTextureStyle(texture), this.boundTextures[location] = texture;
    } else
      this.currentLocation !== location && (this.currentLocation = location, gl.activeTexture(gl.TEXTURE0 + location)), gl.bindTexture(gl.TEXTURE_2D, this.emptyTextures[gl.TEXTURE_2D].texture), this.boundTextures[location] = null;
  }
  /** Resets texture location and bound textures Actual `bind(null, i)` calls will be performed at next `unbind()` call */
  reset() {
    this._unknownBoundTextures = !0, this.hasIntegerTextures = !1, this.currentLocation = -1;
    for (let i = 0; i < this.boundTextures.length; i++)
      this.boundTextures[i] = this.unknownTexture;
  }
  /**
   * Unbind a texture.
   * @param texture - Texture to bind
   */
  unbind(texture) {
    const { gl, boundTextures } = this;
    if (this._unknownBoundTextures) {
      this._unknownBoundTextures = !1;
      for (let i = 0; i < boundTextures.length; i++)
        boundTextures[i] === this.unknownTexture && this.bind(null, i);
    }
    for (let i = 0; i < boundTextures.length; i++)
      boundTextures[i] === texture && (this.currentLocation !== i && (gl.activeTexture(gl.TEXTURE0 + i), this.currentLocation = i), gl.bindTexture(texture.target, this.emptyTextures[texture.target].texture), boundTextures[i] = null);
  }
  /**
   * Ensures that current boundTextures all have FLOAT sampler type,
   * see {@link PIXI.SAMPLER_TYPES} for explanation.
   * @param maxTextures - number of locations to check
   */
  ensureSamplerType(maxTextures) {
    const { boundTextures, hasIntegerTextures, CONTEXT_UID } = this;
    if (hasIntegerTextures)
      for (let i = maxTextures - 1; i >= 0; --i) {
        const tex = boundTextures[i];
        tex && tex._glTextures[CONTEXT_UID].samplerType !== SAMPLER_TYPES.FLOAT && this.renderer.texture.unbind(tex);
      }
  }
  /**
   * Initialize a texture
   * @private
   * @param texture - Texture to initialize
   */
  initTexture(texture) {
    const glTexture = new GLTexture(this.gl.createTexture());
    return glTexture.dirtyId = -1, texture._glTextures[this.CONTEXT_UID] = glTexture, this.managedTextures.push(texture), texture.on("dispose", this.destroyTexture, this), glTexture;
  }
  initTextureType(texture, glTexture) {
    glTexture.internalFormat = this.internalFormats[texture.type]?.[texture.format] ?? texture.format, glTexture.samplerType = this.samplerTypes[glTexture.internalFormat] ?? SAMPLER_TYPES.FLOAT, this.webGLVersion === 2 && texture.type === TYPES.HALF_FLOAT ? glTexture.type = this.gl.HALF_FLOAT : glTexture.type = texture.type;
  }
  /**
   * Update a texture
   * @private
   * @param {PIXI.BaseTexture} texture - Texture to initialize
   */
  updateTexture(texture) {
    const glTexture = texture._glTextures[this.CONTEXT_UID];
    if (!glTexture)
      return;
    const renderer = this.renderer;
    if (this.initTextureType(texture, glTexture), texture.resource?.upload(renderer, texture, glTexture))
      glTexture.samplerType !== SAMPLER_TYPES.FLOAT && (this.hasIntegerTextures = !0);
    else {
      const width = texture.realWidth, height = texture.realHeight, gl = renderer.gl;
      (glTexture.width !== width || glTexture.height !== height || glTexture.dirtyId < 0) && (glTexture.width = width, glTexture.height = height, gl.texImage2D(
        texture.target,
        0,
        glTexture.internalFormat,
        width,
        height,
        0,
        texture.format,
        glTexture.type,
        null
      ));
    }
    texture.dirtyStyleId !== glTexture.dirtyStyleId && this.updateTextureStyle(texture), glTexture.dirtyId = texture.dirtyId;
  }
  /**
   * Deletes the texture from WebGL
   * @private
   * @param texture - the texture to destroy
   * @param [skipRemove=false] - Whether to skip removing the texture from the TextureManager.
   */
  destroyTexture(texture, skipRemove) {
    const { gl } = this;
    if (texture = texture.castToBaseTexture(), texture._glTextures[this.CONTEXT_UID] && (this.unbind(texture), gl.deleteTexture(texture._glTextures[this.CONTEXT_UID].texture), texture.off("dispose", this.destroyTexture, this), delete texture._glTextures[this.CONTEXT_UID], !skipRemove)) {
      const i = this.managedTextures.indexOf(texture);
      i !== -1 && removeItems(this.managedTextures, i, 1);
    }
  }
  /**
   * Update texture style such as mipmap flag
   * @private
   * @param {PIXI.BaseTexture} texture - Texture to update
   */
  updateTextureStyle(texture) {
    const glTexture = texture._glTextures[this.CONTEXT_UID];
    glTexture && ((texture.mipmap === MIPMAP_MODES.POW2 || this.webGLVersion !== 2) && !texture.isPowerOfTwo ? glTexture.mipmap = !1 : glTexture.mipmap = texture.mipmap >= 1, this.webGLVersion !== 2 && !texture.isPowerOfTwo ? glTexture.wrapMode = WRAP_MODES.CLAMP : glTexture.wrapMode = texture.wrapMode, texture.resource?.style(this.renderer, texture, glTexture) || this.setStyle(texture, glTexture), glTexture.dirtyStyleId = texture.dirtyStyleId);
  }
  /**
   * Set style for texture
   * @private
   * @param texture - Texture to update
   * @param glTexture
   */
  setStyle(texture, glTexture) {
    const gl = this.gl;
    if (glTexture.mipmap && texture.mipmap !== MIPMAP_MODES.ON_MANUAL && gl.generateMipmap(texture.target), gl.texParameteri(texture.target, gl.TEXTURE_WRAP_S, glTexture.wrapMode), gl.texParameteri(texture.target, gl.TEXTURE_WRAP_T, glTexture.wrapMode), glTexture.mipmap) {
      gl.texParameteri(texture.target, gl.TEXTURE_MIN_FILTER, texture.scaleMode === SCALE_MODES.LINEAR ? gl.LINEAR_MIPMAP_LINEAR : gl.NEAREST_MIPMAP_NEAREST);
      const anisotropicExt = this.renderer.context.extensions.anisotropicFiltering;
      if (anisotropicExt && texture.anisotropicLevel > 0 && texture.scaleMode === SCALE_MODES.LINEAR) {
        const level = Math.min(texture.anisotropicLevel, gl.getParameter(anisotropicExt.MAX_TEXTURE_MAX_ANISOTROPY_EXT));
        gl.texParameterf(texture.target, anisotropicExt.TEXTURE_MAX_ANISOTROPY_EXT, level);
      }
    } else
      gl.texParameteri(texture.target, gl.TEXTURE_MIN_FILTER, texture.scaleMode === SCALE_MODES.LINEAR ? gl.LINEAR : gl.NEAREST);
    gl.texParameteri(texture.target, gl.TEXTURE_MAG_FILTER, texture.scaleMode === SCALE_MODES.LINEAR ? gl.LINEAR : gl.NEAREST);
  }
  destroy() {
    this.renderer = null;
  }
}
TextureSystem.extension = {
  type: ExtensionType.RendererSystem,
  name: "texture"
};
extensions.add(TextureSystem);
export {
  TextureSystem
};
//# sourceMappingURL=TextureSystem.mjs.map