/// <reference path="../../../dist/preview release/babylon.d.ts"/>

module BABYLON {
    var maxSimultaneousLights = 4;

    class PBRMaterialDefines extends MaterialDefines {
        public DIFFUSE = false;
        public AMBIENT = false;
        public OPACITY = false;
        public OPACITYRGB = false;
        public REFLECTION = false;
        public EMISSIVE = false;
        public SPECULAR = false;
        public BUMP = false;
        public SPECULAROVERALPHA = false;
        public CLIPPLANE = false;
        public ALPHATEST = false;
        public ALPHAFROMDIFFUSE = false;
        public POINTSIZE = false;
        public FOG = false;
        public LIGHT0 = false;
        public LIGHT1 = false;
        public LIGHT2 = false;
        public LIGHT3 = false;
        public SPOTLIGHT0 = false;
        public SPOTLIGHT1 = false;
        public SPOTLIGHT2 = false;
        public SPOTLIGHT3 = false;
        public HEMILIGHT0 = false;
        public HEMILIGHT1 = false;
        public HEMILIGHT2 = false;
        public HEMILIGHT3 = false;
        public POINTLIGHT0 = false;
        public POINTLIGHT1 = false;
        public POINTLIGHT2 = false;
        public POINTLIGHT3 = false;
        public DIRLIGHT0 = false;
        public DIRLIGHT1 = false;
        public DIRLIGHT2 = false;
        public DIRLIGHT3 = false;
        public SPECULARTERM = false;
        public SHADOW0 = false;
        public SHADOW1 = false;
        public SHADOW2 = false;
        public SHADOW3 = false;
        public SHADOWS = false;
        public SHADOWVSM0 = false;
        public SHADOWVSM1 = false;
        public SHADOWVSM2 = false;
        public SHADOWVSM3 = false;
        public SHADOWPCF0 = false;
        public SHADOWPCF1 = false;
        public SHADOWPCF2 = false;
        public SHADOWPCF3 = false;
        public DIFFUSEFRESNEL = false;
        public OPACITYFRESNEL = false;
        public REFLECTIONFRESNEL = false;
        public EMISSIVEFRESNEL = false;
        public FRESNEL = false;
        public NORMAL = false;
        public UV1 = false;
        public UV2 = false;
        public VERTEXCOLOR = false;
        public VERTEXALPHA = false;
        public NUM_BONE_INFLUENCERS = 0;
        public BonesPerMesh = 0;
        public INSTANCES = false;
        public GLOSSINESS = false;
        public ROUGHNESS = false;
        public EMISSIVEASILLUMINATION = false;
        public LINKEMISSIVEWITHDIFFUSE = false;
        public REFLECTIONFRESNELFROMSPECULAR = false;
        public LIGHTMAP = false;
        public USELIGHTMAPASSHADOWMAP = false;
        public REFLECTIONMAP_3D = false;
        public REFLECTIONMAP_SPHERICAL = false;
        public REFLECTIONMAP_PLANAR = false;
        public REFLECTIONMAP_CUBIC = false;
        public REFLECTIONMAP_PROJECTION = false;
        public REFLECTIONMAP_SKYBOX = false;
        public REFLECTIONMAP_EXPLICIT = false;
        public REFLECTIONMAP_EQUIRECTANGULAR = false;
        public INVERTCUBICMAP = false;

        constructor() {
            super();
            this._keys = Object.keys(this);
        }
    }

    export class PBRMaterial extends BABYLON.Material {

        public directIntensity: number = 1.0;
        public emissiveIntensity: number = 1.0;
        public environmentIntensity: number = 1.0;
        public _lightingInfos: Vector4 = new Vector4(this.directIntensity, this.emissiveIntensity, this.environmentIntensity, 0.0);

        public shadowIntensity: number = 1.0;
        public shadeIntensity: number = 1.0;
        private _shadowInfos: Vector4 = new Vector4(this.shadowIntensity, this.shadeIntensity, 0.0, 0.0);

        public cameraExposure: number = 1.0;
        public cameraContrast: number = 1.0;
        private _cameraInfos: Vector4 = new Vector4(1.0, 1.0, 0.0, 0.0);

        public overloadedAmbientIntensity: number = 0.0;
        public overloadedDiffuseIntensity: number = 0.0;
        public overloadedSpecularIntensity: number = 0.0;
        public overloadedEmissiveIntensity: number = 0.0;
        private _overloadedIntensity: Vector4 = new Vector4(this.overloadedAmbientIntensity, this.overloadedDiffuseIntensity, this.overloadedSpecularIntensity, this.overloadedEmissiveIntensity);
        public overloadedAmbient: Color3 = BABYLON.Color3.White();
        public overloadedDiffuse: Color3 = BABYLON.Color3.White();
        public overloadedSpecular: Color3 = BABYLON.Color3.White();
        public overloadedEmissive: Color3 = BABYLON.Color3.White();

        public overloadedSmoothness: number = 0.0;
        public overloadedSmoothnessIntensity: number = 0.0;
        private _overloadedSmoothness: Vector3 = new Vector3(this.overloadedSmoothness, this.overloadedSmoothnessIntensity, 0.0);
       
        public disableBumpMap: boolean = false;

        public diffuseTexture: BaseTexture;
        public ambientTexture: BaseTexture;
        public opacityTexture: BaseTexture;
        public reflectionTexture: BaseTexture;
        public emissiveTexture: BaseTexture;
        public specularTexture: BaseTexture;
        public bumpTexture: BaseTexture;
        public lightmapTexture: BaseTexture;

        public ambientColor = new Color3(0, 0, 0);
        public diffuseColor = new Color3(1, 1, 1);
        public specularColor = new Color3(1, 1, 1);
        public specularPower = 64;
        public emissiveColor = new Color3(0, 0, 0);
        public useAlphaFromDiffuseTexture = false;
        public useEmissiveAsIllumination = false;
        public linkEmissiveWithDiffuse = false;
        public useReflectionFresnelFromSpecular = false;
        public useSpecularOverAlpha = true;
        public disableLighting = false;

        public roughness = 0;

        public useLightmapAsShadowmap = false;

        public diffuseFresnelParameters: FresnelParameters;
        public opacityFresnelParameters: FresnelParameters;
        public reflectionFresnelParameters: FresnelParameters;
        public emissiveFresnelParameters: FresnelParameters;

        public useGlossinessFromSpecularMapAlpha = false;

        private _renderTargets = new SmartArray<RenderTargetTexture>(16);
        private _worldViewProjectionMatrix = Matrix.Zero();
        private _globalAmbientColor = new Color3(0, 0, 0);
        private _tempColor = new Color3();

        private _renderId: number;

        private _defines = new PBRMaterialDefines();
        private _cachedDefines = new PBRMaterialDefines();

        constructor(name: string, scene: Scene) {
            super(name, scene);

            this._cachedDefines.BonesPerMesh = -1;

            this.getRenderTargetTextures = (): SmartArray<RenderTargetTexture> => {
                this._renderTargets.reset();

                if (this.reflectionTexture && this.reflectionTexture.isRenderTarget) {
                    this._renderTargets.push(this.reflectionTexture);
                }

                return this._renderTargets;
            }
        }

        public needAlphaBlending(): boolean {
            return (this.alpha < 1.0) || (this.opacityTexture != null) || this._shouldUseAlphaFromDiffuseTexture() || this.opacityFresnelParameters && this.opacityFresnelParameters.isEnabled;
        }

        public needAlphaTesting(): boolean {
            return this.diffuseTexture != null && this.diffuseTexture.hasAlpha;
        }

        private _shouldUseAlphaFromDiffuseTexture(): boolean {
            return this.diffuseTexture != null && this.diffuseTexture.hasAlpha && this.useAlphaFromDiffuseTexture;
        }

        public getAlphaTestTexture(): BaseTexture {
            return this.diffuseTexture;
        }

        private _checkCache(scene: Scene, mesh?: AbstractMesh, useInstances?: boolean): boolean {
            if (!mesh) {
                return true;
            }

            if (this._defines.INSTANCES !== useInstances) {
                return false;
            }

            if (mesh._materialDefines && mesh._materialDefines.isEqual(this._defines)) {
                return true;
            }

            return false;
        }

        public static PrepareDefinesForLights(scene: Scene, mesh: AbstractMesh, defines: MaterialDefines): boolean {
            var lightIndex = 0;
            var needNormals = false;
            for (var index = 0; index < scene.lights.length; index++) {
                var light = scene.lights[index];

                if (!light.isEnabled()) {
                    continue;
                }

                // Excluded check
                if (light._excludedMeshesIds.length > 0) {
                    for (var excludedIndex = 0; excludedIndex < light._excludedMeshesIds.length; excludedIndex++) {
                        var excludedMesh = scene.getMeshByID(light._excludedMeshesIds[excludedIndex]);

                        if (excludedMesh) {
                            light.excludedMeshes.push(excludedMesh);
                        }
                    }

                    light._excludedMeshesIds = [];
                }

                // Included check
                if (light._includedOnlyMeshesIds.length > 0) {
                    for (var includedOnlyIndex = 0; includedOnlyIndex < light._includedOnlyMeshesIds.length; includedOnlyIndex++) {
                        var includedOnlyMesh = scene.getMeshByID(light._includedOnlyMeshesIds[includedOnlyIndex]);

                        if (includedOnlyMesh) {
                            light.includedOnlyMeshes.push(includedOnlyMesh);
                        }
                    }

                    light._includedOnlyMeshesIds = [];
                }

                if (!light.canAffectMesh(mesh)) {
                    continue;
                }
                needNormals = true;
                defines["LIGHT" + lightIndex] = true;

                var type;
                if (light instanceof SpotLight) {
                    type = "SPOTLIGHT" + lightIndex;
                } else if (light instanceof HemisphericLight) {
                    type = "HEMILIGHT" + lightIndex;
                } else if (light instanceof PointLight) {
                    type = "POINTLIGHT" + lightIndex;
                } else {
                    type = "DIRLIGHT" + lightIndex;
                }

                defines[type] = true;

                // Specular
                if (!light.specular.equalsFloats(0, 0, 0)) {
                    defines["SPECULARTERM"] = true;
                }

                // Shadows
                if (scene.shadowsEnabled) {
                    var shadowGenerator = light.getShadowGenerator();
                    if (mesh && mesh.receiveShadows && shadowGenerator) {
                        defines["SHADOW" + lightIndex] = true;

                        defines["SHADOWS"] = true;

                        if (shadowGenerator.useVarianceShadowMap || shadowGenerator.useBlurVarianceShadowMap) {
                            defines["SHADOWVSM" + lightIndex] = true;
                        }

                        if (shadowGenerator.usePoissonSampling) {
                            defines["SHADOWPCF" + lightIndex] = true;
                        }
                    }
                }

                lightIndex++;
                if (lightIndex === maxSimultaneousLights)
                    break;
            }

            return needNormals;
        }

        private static _scaledDiffuse = new Color3();
        private static _scaledSpecular = new Color3();
        private static _scaledEmissive = new Color3();

        public static BindLights(scene: Scene, mesh: AbstractMesh, effect: Effect, defines: MaterialDefines) {
            var lightIndex = 0;
            for (var index = 0; index < scene.lights.length; index++) {
                var light = scene.lights[index];

                if (!light.isEnabled()) {
                    continue;
                }

                if (!light.canAffectMesh(mesh)) {
                    continue;
                }

                if (light instanceof PointLight) {
                    // Point Light
                    light.transferToEffect(effect, "vLightData" + lightIndex);
                } else if (light instanceof DirectionalLight) {
                    // Directional Light
                    light.transferToEffect(effect, "vLightData" + lightIndex);
                } else if (light instanceof SpotLight) {
                    // Spot Light
                    light.transferToEffect(effect, "vLightData" + lightIndex, "vLightDirection" + lightIndex);
                } else if (light instanceof HemisphericLight) {
                    // Hemispheric Light
                    light.transferToEffect(effect, "vLightData" + lightIndex, "vLightGround" + lightIndex);
                }

                // GAMMA CORRECTION.
                light.diffuse.toLinearSpaceToRef(PBRMaterial._scaledDiffuse);
                PBRMaterial._scaledDiffuse.scaleToRef(light.intensity, PBRMaterial._scaledDiffuse);

                light.diffuse.scaleToRef(light.intensity, PBRMaterial._scaledDiffuse);
                effect.setColor4("vLightDiffuse" + lightIndex, PBRMaterial._scaledDiffuse, light.range);
                if (defines["SPECULARTERM"]) {
                    light.specular.toLinearSpaceToRef(PBRMaterial._scaledSpecular);
                    PBRMaterial._scaledSpecular.scaleToRef(light.intensity, PBRMaterial._scaledSpecular);
                    effect.setColor3("vLightSpecular" + lightIndex, PBRMaterial._scaledSpecular);
                }

                // Shadows
                if (scene.shadowsEnabled) {
                    var shadowGenerator = light.getShadowGenerator();
                    if (mesh.receiveShadows && shadowGenerator) {
                        if (!(<any>light).needCube()) {
                            effect.setMatrix("lightMatrix" + lightIndex, shadowGenerator.getTransformMatrix());
                        }
                        effect.setTexture("shadowSampler" + lightIndex, shadowGenerator.getShadowMapForRendering());
                        effect.setFloat3("shadowsInfo" + lightIndex, shadowGenerator.getDarkness(), shadowGenerator.getShadowMap().getSize().width, shadowGenerator.bias);
                    }
                }

                lightIndex++;

                if (lightIndex === maxSimultaneousLights)
                    break;
            }
        }

        public isReady(mesh?: AbstractMesh, useInstances?: boolean): boolean {

            if (this.checkReadyOnlyOnce) {
                if (this._wasPreviouslyReady) {
                    return true;
                }
            }

            var scene = this.getScene();
            
            if (!this.checkReadyOnEveryCall) {
                if (this._renderId === scene.getRenderId()) {
                    if (this._checkCache(scene, mesh, useInstances)) {
                        return true;
                    }
                }
            }

            var engine = scene.getEngine();
            var needNormals = false;
            var needUVs = false;

            this._defines.reset();

            // Textures
            if (scene.texturesEnabled) {
                if (this.diffuseTexture && StandardMaterial.DiffuseTextureEnabled) {
                    if (!this.diffuseTexture.isReady()) {
                        return false;
                    } else {
                        needUVs = true;
                        this._defines.DIFFUSE = true;
                    }
                }

                if (this.ambientTexture && StandardMaterial.AmbientTextureEnabled) {
                    if (!this.ambientTexture.isReady()) {
                        return false;
                    } else {
                        needUVs = true;
                        this._defines.AMBIENT = true;
                    }
                }

                if (this.opacityTexture && StandardMaterial.OpacityTextureEnabled) {
                    if (!this.opacityTexture.isReady()) {
                        return false;
                    } else {
                        needUVs = true;
                        this._defines.OPACITY = true;

                        if (this.opacityTexture.getAlphaFromRGB) {
                            this._defines.OPACITYRGB = true;
                        }
                    }
                }

                if (this.reflectionTexture && StandardMaterial.ReflectionTextureEnabled) {
                    if (!this.reflectionTexture.isReady()) {
                        return false;
                    } else {
                        needNormals = true;
                        this._defines.REFLECTION = true;

                        if (this.roughness > 0) {
                            this._defines.ROUGHNESS = true;
                        }

                        if (this.reflectionTexture.coordinatesMode === Texture.INVCUBIC_MODE) {
                            this._defines.INVERTCUBICMAP = true;
                        }

                        this._defines.REFLECTIONMAP_3D = this.reflectionTexture.isCube;

                        switch (this.reflectionTexture.coordinatesMode) {
                            case Texture.CUBIC_MODE:
                            case Texture.INVCUBIC_MODE:
                                this._defines.REFLECTIONMAP_CUBIC = true;
                                break;
                            case Texture.EXPLICIT_MODE:
                                this._defines.REFLECTIONMAP_EXPLICIT = true;
                                break;
                            case Texture.PLANAR_MODE:
                                this._defines.REFLECTIONMAP_PLANAR = true;
                                break;
                            case Texture.PROJECTION_MODE:
                                this._defines.REFLECTIONMAP_PROJECTION = true;
                                break;
                            case Texture.SKYBOX_MODE:
                                this._defines.REFLECTIONMAP_SKYBOX = true;
                                break;
                            case Texture.SPHERICAL_MODE:
                                this._defines.REFLECTIONMAP_SPHERICAL = true;
                                break;
                            case Texture.EQUIRECTANGULAR_MODE:
                                this._defines.REFLECTIONMAP_EQUIRECTANGULAR = true;
                                break;
                        }
                    }
                }

                if (this.lightmapTexture && StandardMaterial.LightmapEnabled) {
                    if (!this.lightmapTexture.isReady()) {
                        return false;
                    } else {
                        needUVs = true;
                        this._defines.LIGHTMAP = true;
                        this._defines.USELIGHTMAPASSHADOWMAP = this.useLightmapAsShadowmap;
                    }
                }

                if (this.emissiveTexture && StandardMaterial.EmissiveTextureEnabled) {
                    if (!this.emissiveTexture.isReady()) {
                        return false;
                    } else {
                        needUVs = true;
                        this._defines.EMISSIVE = true;
                    }
                }

                if (this.specularTexture && StandardMaterial.SpecularTextureEnabled) {
                    if (!this.specularTexture.isReady()) {
                        return false;
                    } else {
                        needUVs = true;
                        this._defines.SPECULAR = true;
                        this._defines.GLOSSINESS = this.useGlossinessFromSpecularMapAlpha;
                    }
                }
            }

            if (scene.getEngine().getCaps().standardDerivatives && this.bumpTexture && StandardMaterial.BumpTextureEnabled && !this.disableBumpMap) {
                if (!this.bumpTexture.isReady()) {
                    return false;
                } else {
                    needUVs = true;
                    this._defines.BUMP = true;
                }
            }

            // Effect
            if (scene.clipPlane) {
                this._defines.CLIPPLANE = true;
            }

            if (engine.getAlphaTesting()) {
                this._defines.ALPHATEST = true;
            }

            if (this._shouldUseAlphaFromDiffuseTexture()) {
                this._defines.ALPHAFROMDIFFUSE = true;
            }

            if (this.useEmissiveAsIllumination) {
                this._defines.EMISSIVEASILLUMINATION = true;
            }

            if (this.linkEmissiveWithDiffuse) {
                this._defines.LINKEMISSIVEWITHDIFFUSE = true;
            }

            if (this.useReflectionFresnelFromSpecular) {
                this._defines.REFLECTIONFRESNELFROMSPECULAR = true;
            }

            // Point size
            if (this.pointsCloud || scene.forcePointsCloud) {
                this._defines.POINTSIZE = true;
            }

            // Fog
            if (scene.fogEnabled && mesh && mesh.applyFog && scene.fogMode !== Scene.FOGMODE_NONE && this.fogEnabled) {
                this._defines.FOG = true;
            }

            if (scene.lightsEnabled && !this.disableLighting) {
                needNormals = PBRMaterial.PrepareDefinesForLights(scene, mesh, this._defines);
            }

            if (StandardMaterial.FresnelEnabled) {
                // Fresnel
                if (this.diffuseFresnelParameters && this.diffuseFresnelParameters.isEnabled ||
                    this.opacityFresnelParameters && this.opacityFresnelParameters.isEnabled ||
                    this.emissiveFresnelParameters && this.emissiveFresnelParameters.isEnabled ||
                    this.reflectionFresnelParameters && this.reflectionFresnelParameters.isEnabled) {

                    if (this.diffuseFresnelParameters && this.diffuseFresnelParameters.isEnabled) {
                        this._defines.DIFFUSEFRESNEL = true;
                    }

                    if (this.opacityFresnelParameters && this.opacityFresnelParameters.isEnabled) {
                        this._defines.OPACITYFRESNEL = true;
                    }

                    if (this.reflectionFresnelParameters && this.reflectionFresnelParameters.isEnabled) {
                        this._defines.REFLECTIONFRESNEL = true;
                    }

                    if (this.emissiveFresnelParameters && this.emissiveFresnelParameters.isEnabled) {
                        this._defines.EMISSIVEFRESNEL = true;
                    }

                    needNormals = true;
                    this._defines.FRESNEL = true;
                }
            }

            if (this._defines.SPECULARTERM && this.useSpecularOverAlpha) {
                this._defines.SPECULAROVERALPHA = true;
            }

            // Attribs
            if (mesh) {
                if (needNormals && mesh.isVerticesDataPresent(VertexBuffer.NormalKind)) {
                    this._defines.NORMAL = true;
                }
                if (needUVs) {
                    if (mesh.isVerticesDataPresent(VertexBuffer.UVKind)) {
                        this._defines.UV1 = true;
                    }
                    if (mesh.isVerticesDataPresent(VertexBuffer.UV2Kind)) {
                        this._defines.UV2 = true;
                    }
                }
                if (mesh.useVertexColors && mesh.isVerticesDataPresent(VertexBuffer.ColorKind)) {
                    this._defines.VERTEXCOLOR = true;

                    if (mesh.hasVertexAlpha) {
                        this._defines.VERTEXALPHA = true;
                    }
                }
                if (mesh.useBones && mesh.computeBonesUsingShaders) {
                    this._defines.NUM_BONE_INFLUENCERS = mesh.numBoneInfluencers;
                    this._defines.BonesPerMesh = (mesh.skeleton.bones.length + 1);
                }

                // Instances
                if (useInstances) {
                    this._defines.INSTANCES = true;
                }
            }

            // Get correct effect      
            if (!this._defines.isEqual(this._cachedDefines)) {
                this._defines.cloneTo(this._cachedDefines);

                scene.resetCachedMaterial();

                // Fallbacks
                var fallbacks = new EffectFallbacks();
                if (this._defines.REFLECTION) {
                    fallbacks.addFallback(0, "REFLECTION");
                }

                if (this._defines.SPECULAR) {
                    fallbacks.addFallback(0, "SPECULAR");
                }

                if (this._defines.BUMP) {
                    fallbacks.addFallback(0, "BUMP");
                }

                if (this._defines.SPECULAROVERALPHA) {
                    fallbacks.addFallback(0, "SPECULAROVERALPHA");
                }

                if (this._defines.FOG) {
                    fallbacks.addFallback(1, "FOG");
                }

                for (let lightIndex = 0; lightIndex < maxSimultaneousLights; lightIndex++) {
                    if (!this._defines["LIGHT" + lightIndex]) {
                        continue;
                    }

                    if (lightIndex > 0) {
                        fallbacks.addFallback(lightIndex, "LIGHT" + lightIndex);
                    }

                    if (this._defines["SHADOW" + lightIndex]) {
                        fallbacks.addFallback(0, "SHADOW" + lightIndex);
                    }

                    if (this._defines["SHADOWPCF" + lightIndex]) {
                        fallbacks.addFallback(0, "SHADOWPCF" + lightIndex);
                    }

                    if (this._defines["SHADOWVSM" + lightIndex]) {
                        fallbacks.addFallback(0, "SHADOWVSM" + lightIndex);
                    }
                }

                if (this._defines.SPECULARTERM) {
                    fallbacks.addFallback(0, "SPECULARTERM");
                }

                if (this._defines.DIFFUSEFRESNEL) {
                    fallbacks.addFallback(1, "DIFFUSEFRESNEL");
                }

                if (this._defines.OPACITYFRESNEL) {
                    fallbacks.addFallback(2, "OPACITYFRESNEL");
                }

                if (this._defines.REFLECTIONFRESNEL) {
                    fallbacks.addFallback(3, "REFLECTIONFRESNEL");
                }

                if (this._defines.EMISSIVEFRESNEL) {
                    fallbacks.addFallback(4, "EMISSIVEFRESNEL");
                }

                if (this._defines.FRESNEL) {
                    fallbacks.addFallback(4, "FRESNEL");
                }

                if (this._defines.NUM_BONE_INFLUENCERS > 0){
                    fallbacks.addCPUSkinningFallback(0, mesh);    
                }

                //Attributes
                var attribs = [VertexBuffer.PositionKind];

                if (this._defines.NORMAL) {
                    attribs.push(VertexBuffer.NormalKind);
                }

                if (this._defines.UV1) {
                    attribs.push(VertexBuffer.UVKind);
                }

                if (this._defines.UV2) {
                    attribs.push(VertexBuffer.UV2Kind);
                }

                if (this._defines.VERTEXCOLOR) {
                    attribs.push(VertexBuffer.ColorKind);
                }
                
                if (this._defines.NUM_BONE_INFLUENCERS > 0) {
                    attribs.push(VertexBuffer.MatricesIndicesKind);
                    attribs.push(VertexBuffer.MatricesWeightsKind);
                    if (this._defines.NUM_BONE_INFLUENCERS > 4) {
                        attribs.push(VertexBuffer.MatricesIndicesExtraKind);
                        attribs.push(VertexBuffer.MatricesWeightsExtraKind);
                    }
                }

                if (this._defines.INSTANCES) {
                    attribs.push("world0");
                    attribs.push("world1");
                    attribs.push("world2");
                    attribs.push("world3");
                }

                // Legacy browser patch
                var shaderName = "pbr";
                if (!scene.getEngine().getCaps().standardDerivatives) {
                    shaderName = "legacypbr";
                }
                var join = this._defines.toString();
                this._effect = scene.getEngine().createEffect(shaderName,
                    attribs,
                    ["world", "view", "viewProjection", "vEyePosition", "vLightsType", "vAmbientColor", "vDiffuseColor", "vSpecularColor", "vEmissiveColor",
                        "vLightData0", "vLightDiffuse0", "vLightSpecular0", "vLightDirection0", "vLightGround0", "lightMatrix0",
                        "vLightData1", "vLightDiffuse1", "vLightSpecular1", "vLightDirection1", "vLightGround1", "lightMatrix1",
                        "vLightData2", "vLightDiffuse2", "vLightSpecular2", "vLightDirection2", "vLightGround2", "lightMatrix2",
                        "vLightData3", "vLightDiffuse3", "vLightSpecular3", "vLightDirection3", "vLightGround3", "lightMatrix3",
                        "vFogInfos", "vFogColor", "pointSize",
                        "vDiffuseInfos", "vAmbientInfos", "vOpacityInfos", "vReflectionInfos", "vEmissiveInfos", "vSpecularInfos", "vBumpInfos", "vLightmapInfos",
                        "mBones",
                        "vClipPlane", "diffuseMatrix", "ambientMatrix", "opacityMatrix", "reflectionMatrix", "emissiveMatrix", "specularMatrix", "bumpMatrix", "lightmapMatrix",
                        "shadowsInfo0", "shadowsInfo1", "shadowsInfo2", "shadowsInfo3",
                        "diffuseLeftColor", "diffuseRightColor", "opacityParts", "reflectionLeftColor", "reflectionRightColor", "emissiveLeftColor", "emissiveRightColor",
                        "roughness",
                        "vPBRLightingIntensity", "vPBRShadowIntensity", "vPBROverloadedIntensity", "vPBRCameraInfos", "vPBROverloadedDiffuse", "vPBROverloadedSpecular", "vPBROverloadedEmissive", "vPBROverloadedSmoothness"
                    ],
                    ["diffuseSampler", "ambientSampler", "opacitySampler", "reflectionCubeSampler", "reflection2DSampler", "emissiveSampler", "specularSampler", "bumpSampler", "lightmapSampler",
                        "shadowSampler0", "shadowSampler1", "shadowSampler2", "shadowSampler3"
                    ],
                    join, fallbacks, this.onCompiled, this.onError);
            }
            if (!this._effect.isReady()) {
                return false;
            }

            this._renderId = scene.getRenderId();
            this._wasPreviouslyReady = true;

            if (mesh) {
                if (!mesh._materialDefines) {
                    mesh._materialDefines = new PBRMaterialDefines();
                }

                this._defines.cloneTo(mesh._materialDefines);
            }

            return true;
        }


        public unbind(): void {
            if (this.reflectionTexture && this.reflectionTexture.isRenderTarget) {
                this._effect.setTexture("reflection2DSampler", null);
            }

            super.unbind();
        }

        public bindOnlyWorldMatrix(world: Matrix): void {
            this._effect.setMatrix("world", world);
        }

        private _myScene: BABYLON.Scene = null;
        private _myShadowGenerator: BABYLON.ShadowGenerator = null;

        public bind(world: Matrix, mesh?: Mesh): void {
            this._myScene = this.getScene();

            // Matrices        
            this.bindOnlyWorldMatrix(world);
            this._effect.setMatrix("viewProjection", this._myScene.getTransformMatrix());

            // Bones
            if (mesh && mesh.useBones && mesh.computeBonesUsingShaders) {
                this._effect.setMatrices("mBones", mesh.skeleton.getTransformMatrices());
            }

            if (this._myScene.getCachedMaterial() !== (<BABYLON.Material>this)) {

                if (StandardMaterial.FresnelEnabled) {
                    // Fresnel
                    if (this.diffuseFresnelParameters && this.diffuseFresnelParameters.isEnabled) {
                        this._effect.setColor4("diffuseLeftColor", this.diffuseFresnelParameters.leftColor, this.diffuseFresnelParameters.power);
                        this._effect.setColor4("diffuseRightColor", this.diffuseFresnelParameters.rightColor, this.diffuseFresnelParameters.bias);
                    }

                    if (this.opacityFresnelParameters && this.opacityFresnelParameters.isEnabled) {
                        this._effect.setColor4("opacityParts", new Color3(this.opacityFresnelParameters.leftColor.toLuminance(), this.opacityFresnelParameters.rightColor.toLuminance(), this.opacityFresnelParameters.bias), this.opacityFresnelParameters.power);
                    }

                    if (this.reflectionFresnelParameters && this.reflectionFresnelParameters.isEnabled) {
                        this._effect.setColor4("reflectionLeftColor", this.reflectionFresnelParameters.leftColor, this.reflectionFresnelParameters.power);
                        this._effect.setColor4("reflectionRightColor", this.reflectionFresnelParameters.rightColor, this.reflectionFresnelParameters.bias);
                    }

                    if (this.emissiveFresnelParameters && this.emissiveFresnelParameters.isEnabled) {
                        this._effect.setColor4("emissiveLeftColor", this.emissiveFresnelParameters.leftColor, this.emissiveFresnelParameters.power);
                        this._effect.setColor4("emissiveRightColor", this.emissiveFresnelParameters.rightColor, this.emissiveFresnelParameters.bias);
                    }
                }

                // Textures        
                if (this.diffuseTexture && StandardMaterial.DiffuseTextureEnabled) {
                    this._effect.setTexture("diffuseSampler", this.diffuseTexture);

                    this._effect.setFloat2("vDiffuseInfos", this.diffuseTexture.coordinatesIndex, this.diffuseTexture.level);
                    this._effect.setMatrix("diffuseMatrix", this.diffuseTexture.getTextureMatrix());
                }

                if (this.ambientTexture && StandardMaterial.AmbientTextureEnabled) {
                    this._effect.setTexture("ambientSampler", this.ambientTexture);

                    this._effect.setFloat2("vAmbientInfos", this.ambientTexture.coordinatesIndex, this.ambientTexture.level);
                    this._effect.setMatrix("ambientMatrix", this.ambientTexture.getTextureMatrix());
                }

                if (this.opacityTexture && StandardMaterial.OpacityTextureEnabled) {
                    this._effect.setTexture("opacitySampler", this.opacityTexture);

                    this._effect.setFloat2("vOpacityInfos", this.opacityTexture.coordinatesIndex, this.opacityTexture.level);
                    this._effect.setMatrix("opacityMatrix", this.opacityTexture.getTextureMatrix());
                }

                if (this.reflectionTexture && StandardMaterial.ReflectionTextureEnabled) {
                    if (this.reflectionTexture.isCube) {
                        this._effect.setTexture("reflectionCubeSampler", this.reflectionTexture);
                    } else {
                        this._effect.setTexture("reflection2DSampler", this.reflectionTexture);
                    }

                    this._effect.setMatrix("reflectionMatrix", this.reflectionTexture.getReflectionTextureMatrix());
                    this._effect.setFloat2("vReflectionInfos", this.reflectionTexture.level, this.roughness);
                }

                if (this.emissiveTexture && StandardMaterial.EmissiveTextureEnabled) {
                    this._effect.setTexture("emissiveSampler", this.emissiveTexture);

                    this._effect.setFloat2("vEmissiveInfos", this.emissiveTexture.coordinatesIndex, this.emissiveTexture.level);
                    this._effect.setMatrix("emissiveMatrix", this.emissiveTexture.getTextureMatrix());
                }

                if (this.lightmapTexture && StandardMaterial.LightmapEnabled) {
                    this._effect.setTexture("lightmapSampler", this.lightmapTexture);

                    this._effect.setFloat2("vLightmapInfos", this.lightmapTexture.coordinatesIndex, this.lightmapTexture.level);
                    this._effect.setMatrix("lightmapMatrix", this.lightmapTexture.getTextureMatrix());
                }

                if (this.specularTexture && StandardMaterial.SpecularTextureEnabled) {
                    this._effect.setTexture("specularSampler", this.specularTexture);

                    this._effect.setFloat2("vSpecularInfos", this.specularTexture.coordinatesIndex, this.specularTexture.level);
                    this._effect.setMatrix("specularMatrix", this.specularTexture.getTextureMatrix());
                }

                if (this.bumpTexture && this._myScene.getEngine().getCaps().standardDerivatives && StandardMaterial.BumpTextureEnabled && !this.disableBumpMap) {
                    this._effect.setTexture("bumpSampler", this.bumpTexture);

                    this._effect.setFloat2("vBumpInfos", this.bumpTexture.coordinatesIndex, 1.0 / this.bumpTexture.level);
                    this._effect.setMatrix("bumpMatrix", this.bumpTexture.getTextureMatrix());
                }

                // Clip plane
                if (this._myScene.clipPlane) {
                    this._effect.setFloat4("vClipPlane", this._myScene.clipPlane.normal.x,
                        this._myScene.clipPlane.normal.y,
                        this._myScene.clipPlane.normal.z,
                        this._myScene.clipPlane.d);
                }

                // Point size
                if (this.pointsCloud) {
                    this._effect.setFloat("pointSize", this.pointSize);
                }

                // Colors
                this._myScene.ambientColor.multiplyToRef(this.ambientColor, this._globalAmbientColor);
                
                // GAMMA CORRECTION.
                this.specularColor.toLinearSpaceToRef(PBRMaterial._scaledSpecular);

                this._effect.setVector3("vEyePosition", this._myScene._mirroredCameraPosition ? this._myScene._mirroredCameraPosition : this._myScene.activeCamera.position);
                this._effect.setColor3("vAmbientColor", this._globalAmbientColor);

                if (this._defines.SPECULARTERM) {
                    this._effect.setColor4("vSpecularColor", PBRMaterial._scaledSpecular, this.specularPower);
                }

                // GAMMA CORRECTION.
                this.emissiveColor.toLinearSpaceToRef(PBRMaterial._scaledEmissive); 
                this._effect.setColor3("vEmissiveColor", PBRMaterial._scaledEmissive);
            }

            // GAMMA CORRECTION.
            this.diffuseColor.toLinearSpaceToRef(PBRMaterial._scaledDiffuse);
            this._effect.setColor4("vDiffuseColor", PBRMaterial._scaledDiffuse, this.alpha * mesh.visibility);

            // Lights
            if (this._myScene.lightsEnabled && !this.disableLighting) {
                PBRMaterial.BindLights(this._myScene, mesh, this._effect, this._defines);
            }

            // View
            if (this._myScene.fogEnabled && mesh.applyFog && this._myScene.fogMode !== Scene.FOGMODE_NONE || this.reflectionTexture) {
                this._effect.setMatrix("view", this._myScene.getViewMatrix());
            }

            // Fog
            if (this._myScene.fogEnabled && mesh.applyFog && this._myScene.fogMode !== Scene.FOGMODE_NONE) {
                this._effect.setFloat4("vFogInfos", this._myScene.fogMode, this._myScene.fogStart, this._myScene.fogEnd, this._myScene.fogDensity);
                this._effect.setColor3("vFogColor", this._myScene.fogColor);
            }
            

            this._lightingInfos.x = this.directIntensity;
            this._lightingInfos.y = this.emissiveIntensity;
            this._lightingInfos.z = this.environmentIntensity;
            this._effect.setVector4("vPBRLightingIntensity", this._lightingInfos);

            this._shadowInfos.x = this.shadowIntensity;
            this._shadowInfos.y = this.shadeIntensity;
            this._effect.setVector4("vPBRShadowIntensity", this._shadowInfos);

            this._cameraInfos.x = this.cameraExposure;
            this._cameraInfos.y = this.cameraContrast;
            this._effect.setVector4("vPBRCameraInfos", this._cameraInfos);

            this._overloadedIntensity.x = this.overloadedAmbientIntensity;
            this._overloadedIntensity.y = this.overloadedDiffuseIntensity;
            this._overloadedIntensity.z = this.overloadedSpecularIntensity;
            this._overloadedIntensity.w = this.overloadedEmissiveIntensity;
            this._effect.setVector4("vPBROverloadedIntensity", this._overloadedIntensity);

            this.overloadedAmbient.toLinearSpaceToRef(this._tempColor);
            this._effect.setColor3("vPBROverloadedAmbient", this._tempColor);
            this.overloadedDiffuse.toLinearSpaceToRef(this._tempColor);
            this._effect.setColor3("vPBROverloadedDiffuse", this._tempColor);
            this.overloadedSpecular.toLinearSpaceToRef(this._tempColor);
            this._effect.setColor3("vPBROverloadedSpecular", this._tempColor);
            this.overloadedEmissive.toLinearSpaceToRef(this._tempColor);
            this._effect.setColor3("vPBROverloadedEmissive", this._tempColor);

            this._overloadedSmoothness.x = this.overloadedSmoothness;
            this._overloadedSmoothness.y = this.overloadedSmoothnessIntensity;
            this._effect.setVector3("vPBROverloadedSmoothness", this._overloadedSmoothness);

            super.bind(world, mesh);

            this._myScene = null;
        }

        public getAnimatables(): IAnimatable[] {
            var results = [];

            if (this.diffuseTexture && this.diffuseTexture.animations && this.diffuseTexture.animations.length > 0) {
                results.push(this.diffuseTexture);
            }

            if (this.ambientTexture && this.ambientTexture.animations && this.ambientTexture.animations.length > 0) {
                results.push(this.ambientTexture);
            }

            if (this.opacityTexture && this.opacityTexture.animations && this.opacityTexture.animations.length > 0) {
                results.push(this.opacityTexture);
            }

            if (this.reflectionTexture && this.reflectionTexture.animations && this.reflectionTexture.animations.length > 0) {
                results.push(this.reflectionTexture);
            }

            if (this.emissiveTexture && this.emissiveTexture.animations && this.emissiveTexture.animations.length > 0) {
                results.push(this.emissiveTexture);
            }

            if (this.specularTexture && this.specularTexture.animations && this.specularTexture.animations.length > 0) {
                results.push(this.specularTexture);
            }

            if (this.bumpTexture && this.bumpTexture.animations && this.bumpTexture.animations.length > 0) {
                results.push(this.bumpTexture);
            }

            return results;
        }

        public dispose(forceDisposeEffect?: boolean): void {
            if (this.diffuseTexture) {
                this.diffuseTexture.dispose();
            }

            if (this.ambientTexture) {
                this.ambientTexture.dispose();
            }

            if (this.opacityTexture) {
                this.opacityTexture.dispose();
            }

            if (this.reflectionTexture) {
                this.reflectionTexture.dispose();
            }

            if (this.emissiveTexture) {
                this.emissiveTexture.dispose();
            }

            if (this.specularTexture) {
                this.specularTexture.dispose();
            }

            if (this.bumpTexture) {
                this.bumpTexture.dispose();
            }

            super.dispose(forceDisposeEffect);
        }

        public clone(name: string): PBRMaterial {
            var newPBRMaterial = new PBRMaterial(name, this.getScene());

            // Base material
            this.copyTo(newPBRMaterial);

            // PBR material
            if (this.diffuseTexture && this.diffuseTexture.clone) {
                newPBRMaterial.diffuseTexture = this.diffuseTexture.clone();
            }
            if (this.ambientTexture && this.ambientTexture.clone) {
                newPBRMaterial.ambientTexture = this.ambientTexture.clone();
            }
            if (this.opacityTexture && this.opacityTexture.clone) {
                newPBRMaterial.opacityTexture = this.opacityTexture.clone();
            }
            if (this.reflectionTexture && this.reflectionTexture.clone) {
                newPBRMaterial.reflectionTexture = this.reflectionTexture.clone();
            }
            if (this.emissiveTexture && this.emissiveTexture.clone) {
                newPBRMaterial.emissiveTexture = this.emissiveTexture.clone();
            }
            if (this.specularTexture && this.specularTexture.clone) {
                newPBRMaterial.specularTexture = this.specularTexture.clone();
            }
            if (this.bumpTexture && this.bumpTexture.clone) {
                newPBRMaterial.bumpTexture = this.bumpTexture.clone();
            }
            if (this.lightmapTexture && this.lightmapTexture.clone) {
                newPBRMaterial.lightmapTexture = this.lightmapTexture.clone();
                newPBRMaterial.useLightmapAsShadowmap = this.useLightmapAsShadowmap;
            }

            newPBRMaterial.ambientColor = this.ambientColor.clone();
            newPBRMaterial.diffuseColor = this.diffuseColor.clone();
            newPBRMaterial.specularColor = this.specularColor.clone();
            newPBRMaterial.specularPower = this.specularPower;
            newPBRMaterial.emissiveColor = this.emissiveColor.clone();
            newPBRMaterial.useAlphaFromDiffuseTexture = this.useAlphaFromDiffuseTexture;
            newPBRMaterial.useEmissiveAsIllumination = this.useEmissiveAsIllumination;
            newPBRMaterial.useGlossinessFromSpecularMapAlpha = this.useGlossinessFromSpecularMapAlpha;
            newPBRMaterial.useReflectionFresnelFromSpecular = this.useReflectionFresnelFromSpecular;
            newPBRMaterial.useSpecularOverAlpha = this.useSpecularOverAlpha;
            newPBRMaterial.roughness = this.roughness;

            newPBRMaterial.diffuseFresnelParameters = this.diffuseFresnelParameters.clone();
            newPBRMaterial.emissiveFresnelParameters = this.emissiveFresnelParameters.clone();
            newPBRMaterial.reflectionFresnelParameters = this.reflectionFresnelParameters.clone();
            newPBRMaterial.opacityFresnelParameters = this.opacityFresnelParameters.clone();
            
            newPBRMaterial.directIntensity = this.directIntensity;
            newPBRMaterial.emissiveIntensity = this.emissiveIntensity;
            newPBRMaterial.environmentIntensity = this.environmentIntensity;
    
            newPBRMaterial.shadowIntensity = this.shadowIntensity;
            newPBRMaterial.shadeIntensity = this.shadeIntensity;
    
            newPBRMaterial.cameraExposure = this.cameraExposure;
            newPBRMaterial.cameraContrast = this.cameraContrast;
    
            newPBRMaterial.overloadedAmbientIntensity = this.overloadedAmbientIntensity;
            newPBRMaterial.overloadedDiffuseIntensity = this.overloadedDiffuseIntensity;
            newPBRMaterial.overloadedSpecularIntensity = this.overloadedSpecularIntensity;
            newPBRMaterial.overloadedEmissiveIntensity = this.overloadedEmissiveIntensity;
            newPBRMaterial.overloadedAmbient = this.overloadedAmbient.clone();
            newPBRMaterial.overloadedDiffuse = this.overloadedDiffuse.clone();
            newPBRMaterial.overloadedSpecular = this.overloadedSpecular.clone();
            newPBRMaterial.overloadedEmissive = this.overloadedEmissive.clone();
    
            newPBRMaterial.overloadedSmoothness = this.overloadedSmoothness;
            newPBRMaterial.overloadedSmoothnessIntensity = this.overloadedSmoothnessIntensity;
        
            newPBRMaterial.disableBumpMap = this.disableBumpMap;

            return newPBRMaterial;
        }
    }
} 


/* jshint ignore:end */