"use strict";
var __defProp = Object.defineProperty;
var __defNormalProp = (obj, key, value) => key in obj ? __defProp(obj, key, { enumerable: true, configurable: true, writable: true, value }) : obj[key] = value;
var __publicField = (obj, key, value) => {
  __defNormalProp(obj, typeof key !== "symbol" ? key + "" : key, value);
  return value;
};
Object.defineProperty(exports, Symbol.toStringTag, { value: "Module" });
const THREE = require("three");
var _mipmapMaterial = /* @__PURE__ */ _getMipmapMaterial();
var _mesh = /* @__PURE__ */ new THREE.Mesh(/* @__PURE__ */ new THREE.PlaneGeometry(2, 2), _mipmapMaterial);
var _flatCamera = /* @__PURE__ */ new THREE.OrthographicCamera(0, 1, 0, 1, 0, 1);
var _tempTarget = null;
class RoughnessMipmapper {
  constructor(renderer) {
    __publicField(this, "generateMipmaps", function(material) {
      if ("roughnessMap" in material === false)
        return;
      var { roughnessMap, normalMap } = material;
      if (roughnessMap === null || normalMap === null || !roughnessMap.generateMipmaps || material.userData.roughnessUpdated) {
        return;
      }
      material.userData.roughnessUpdated = true;
      var width = Math.max(roughnessMap.image.width, normalMap.image.width);
      var height = Math.max(roughnessMap.image.height, normalMap.image.height);
      if (!THREE.MathUtils.isPowerOfTwo(width) || !THREE.MathUtils.isPowerOfTwo(height))
        return;
      var oldTarget = this._renderer.getRenderTarget();
      var autoClear = this._renderer.autoClear;
      this._renderer.autoClear = false;
      if (_tempTarget === null || _tempTarget.width !== width || _tempTarget.height !== height) {
        if (_tempTarget !== null)
          _tempTarget.dispose();
        _tempTarget = new THREE.WebGLRenderTarget(width, height, {
          depthBuffer: false
        });
        _tempTarget.scissorTest = true;
      }
      if (width !== roughnessMap.image.width || height !== roughnessMap.image.height) {
        var params = {
          wrapS: roughnessMap.wrapS,
          wrapT: roughnessMap.wrapT,
          magFilter: roughnessMap.magFilter,
          minFilter: roughnessMap.minFilter,
          depthBuffer: false
        };
        var newRoughnessTarget = new THREE.WebGLRenderTarget(width, height, params);
        newRoughnessTarget.texture.generateMipmaps = true;
        this._renderer.setRenderTarget(newRoughnessTarget);
        material.roughnessMap = newRoughnessTarget.texture;
        if (material.metalnessMap == roughnessMap)
          material.metalnessMap = material.roughnessMap;
        if (material.aoMap == roughnessMap)
          material.aoMap = material.roughnessMap;
      }
      _mipmapMaterial.uniforms.roughnessMap.value = roughnessMap;
      _mipmapMaterial.uniforms.normalMap.value = normalMap;
      var position = new THREE.Vector2(0, 0);
      var texelSize = _mipmapMaterial.uniforms.texelSize.value;
      for (let mip = 0; width >= 1 && height >= 1; ++mip, width /= 2, height /= 2) {
        texelSize.set(1 / width, 1 / height);
        if (mip == 0)
          texelSize.set(0, 0);
        _tempTarget.viewport.set(position.x, position.y, width, height);
        _tempTarget.scissor.set(position.x, position.y, width, height);
        this._renderer.setRenderTarget(_tempTarget);
        this._renderer.render(_mesh, _flatCamera);
        this._renderer.copyFramebufferToTexture(position, material.roughnessMap, mip);
        _mipmapMaterial.uniforms.roughnessMap.value = material.roughnessMap;
      }
      if (roughnessMap !== material.roughnessMap)
        roughnessMap.dispose();
      this._renderer.setRenderTarget(oldTarget);
      this._renderer.autoClear = autoClear;
    });
    __publicField(this, "dispose", function() {
      _mipmapMaterial.dispose();
      _mesh.geometry.dispose();
      if (_tempTarget != null)
        _tempTarget.dispose();
    });
    this._renderer = renderer;
    this._renderer.compile(_mesh, _flatCamera);
  }
}
function _getMipmapMaterial() {
  var shaderMaterial = new THREE.RawShaderMaterial({
    uniforms: {
      roughnessMap: { value: null },
      normalMap: { value: null },
      texelSize: { value: new THREE.Vector2(1, 1) }
    },
    vertexShader: (
      /* glsl */
      `
			precision mediump float;
			precision mediump int;

			attribute vec3 position;
			attribute vec2 uv;

			varying vec2 vUv;

			void main() {

				vUv = uv;

				gl_Position = vec4( position, 1.0 );

			}
		`
    ),
    fragmentShader: (
      /* glsl */
      `
			precision mediump float;
			precision mediump int;

			varying vec2 vUv;

			uniform sampler2D roughnessMap;
			uniform sampler2D normalMap;
			uniform vec2 texelSize;

			#define ENVMAP_TYPE_CUBE_UV

			vec4 envMapTexelToLinear( vec4 a ) { return a; }

			#include <cube_uv_reflection_fragment>

			float roughnessToVariance( float roughness ) {

				float variance = 0.0;

				if ( roughness >= r1 ) {

					variance = ( r0 - roughness ) * ( v1 - v0 ) / ( r0 - r1 ) + v0;

				} else if ( roughness >= r4 ) {

					variance = ( r1 - roughness ) * ( v4 - v1 ) / ( r1 - r4 ) + v1;

				} else if ( roughness >= r5 ) {

					variance = ( r4 - roughness ) * ( v5 - v4 ) / ( r4 - r5 ) + v4;

				} else {

					float roughness2 = roughness * roughness;

					variance = 1.79 * roughness2 * roughness2;

				}

				return variance;

			}

			float varianceToRoughness( float variance ) {

				float roughness = 0.0;

				if ( variance >= v1 ) {

					roughness = ( v0 - variance ) * ( r1 - r0 ) / ( v0 - v1 ) + r0;

				} else if ( variance >= v4 ) {

					roughness = ( v1 - variance ) * ( r4 - r1 ) / ( v1 - v4 ) + r1;

				} else if ( variance >= v5 ) {

					roughness = ( v4 - variance ) * ( r5 - r4 ) / ( v4 - v5 ) + r4;

				} else {

					roughness = pow( 0.559 * variance, 0.25 ); // 0.559 = 1.0 / 1.79

				}

				return roughness;

			}

			void main() {

				gl_FragColor = texture2D( roughnessMap, vUv, - 1.0 );

				if ( texelSize.x == 0.0 ) return;

				float roughness = gl_FragColor.g;

				float variance = roughnessToVariance( roughness );

				vec3 avgNormal;

				for ( float x = - 1.0; x < 2.0; x += 2.0 ) {

					for ( float y = - 1.0; y < 2.0; y += 2.0 ) {

						vec2 uv = vUv + vec2( x, y ) * 0.25 * texelSize;

						avgNormal += normalize( texture2D( normalMap, uv, - 1.0 ).xyz - 0.5 );

					}

				}

				variance += 1.0 - 0.25 * length( avgNormal );

				gl_FragColor.g = varianceToRoughness( variance );

			}
		`
    ),
    blending: THREE.NoBlending,
    depthTest: false,
    depthWrite: false
  });
  shaderMaterial.type = "RoughnessMipmapper";
  return shaderMaterial;
}
exports.RoughnessMipmapper = RoughnessMipmapper;
//# sourceMappingURL=RoughnessMipmapper.cjs.map