Initial project import

node_modules/three-stdlib/utils/RoughnessMipmapper.js

@@ -0,0 +1,224 @@
+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;
+};
+import { MathUtils, WebGLRenderTarget, Vector2, Mesh, PlaneGeometry, OrthographicCamera, RawShaderMaterial, NoBlending } from "three";
+var _mipmapMaterial = /* @__PURE__ */ _getMipmapMaterial();
+var _mesh = /* @__PURE__ */ new Mesh(/* @__PURE__ */ new PlaneGeometry(2, 2), _mipmapMaterial);
+var _flatCamera = /* @__PURE__ */ new 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 (!MathUtils.isPowerOfTwo(width) || !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 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 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 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 RawShaderMaterial({
+    uniforms: {
+      roughnessMap: { value: null },
+      normalMap: { value: null },
+      texelSize: { value: new 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: NoBlending,
+    depthTest: false,
+    depthWrite: false
+  });
+  shaderMaterial.type = "RoughnessMipmapper";
+  return shaderMaterial;
+}
+export {
+  RoughnessMipmapper
+};
+//# sourceMappingURL=RoughnessMipmapper.js.map