Babylon.js/materialsLibrary/src/shadowOnly/babylon.shadowOnlyMaterial.ts

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

module BABYLON {
    class ShadowOnlyMaterialDefines extends MaterialDefines {
        public CLIPPLANE = false;
        public POINTSIZE = false;
        public FOG = false;
        public NORMAL = false;
        public NUM_BONE_INFLUENCERS = 0;
        public BonesPerMesh = 0;
        public INSTANCES = false;

        constructor() {
            super();
            this.rebuild();
        }
    }

    export class ShadowOnlyMaterial extends Material {
        @serialize()

        private _worldViewProjectionMatrix = Matrix.Zero();
        private _scaledDiffuse = new Color3();
        private _renderId: number;

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

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

            this._cachedDefines.BonesPerMesh = -1;
        }

        public needAlphaBlending(): boolean {
            return true;
        }

        public needAlphaTesting(): boolean {
            return false;
        }

        public getAlphaTestTexture(): BaseTexture {
            return null;
        }

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

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

            return false;
        }

        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;

            this._defines.reset();

            // Effect
            if (scene.clipPlane) {
                this._defines.CLIPPLANE = 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) {
                needNormals = MaterialHelper.PrepareDefinesForLights(scene, mesh, this._defines, false, 1);
            }

            // Attribs
            if (mesh) {
                if (needNormals && mesh.isVerticesDataPresent(VertexBuffer.NormalKind)) {
                    this._defines.NORMAL = 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.FOG) {
                    fallbacks.addFallback(1, "FOG");
                }

                MaterialHelper.HandleFallbacksForShadows(this._defines, fallbacks, 1);
                
                if (this._defines.NUM_BONE_INFLUENCERS > 0) {
                    fallbacks.addCPUSkinningFallback(0, mesh);
                }

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

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

                MaterialHelper.PrepareAttributesForBones(attribs, mesh, this._defines, fallbacks);
                MaterialHelper.PrepareAttributesForInstances(attribs, this._defines);

                var shaderName = "shadowOnly";
                var join = this._defines.toString();
                var uniforms = ["world", "view", "viewProjection", "vEyePosition", "vLightsType",
                                "vFogInfos", "vFogColor", "pointSize",
                                "mBones",
                                "vClipPlane", "depthValues"
                ];
                var samplers = [];
                    
                MaterialHelper.PrepareUniformsAndSamplersList(uniforms, samplers, this._defines, 1);
                
                this._effect = scene.getEngine().createEffect(shaderName,
                    attribs, uniforms, samplers,
                    join, fallbacks, this.onCompiled, this.onError, {maxSimultaneousLights: 1});
            }
            if (!this._effect.isReady()) {
                return false;
            }

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

            return true;
        }

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

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

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

            // Bones
            MaterialHelper.BindBonesParameters(mesh, this._effect);

            if (scene.getCachedMaterial() !== this) {
                // Clip plane
                MaterialHelper.BindClipPlane(this._effect, scene);

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

                this._effect.setVector3("vEyePosition", scene._mirroredCameraPosition ? scene._mirroredCameraPosition : scene.activeCamera.position);                
            }

            // Lights
            if (scene.lightsEnabled) {
                MaterialHelper.BindLights(scene, mesh, this._effect, this._defines, 1);          
            }

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

            // Fog
            MaterialHelper.BindFogParameters(scene, mesh, this._effect);

            this._afterBind(mesh);
        }

        public clone(name: string): ShadowOnlyMaterial {
            return SerializationHelper.Clone<ShadowOnlyMaterial>(() => new ShadowOnlyMaterial(name, this.getScene()), this);
        }
        
        public serialize(): any {
            var serializationObject = SerializationHelper.Serialize(this);
            serializationObject.customType = "BABYLON.ShadowOnlyMaterial";
            return serializationObject;
        }

        // Statics
        public static Parse(source: any, scene: Scene, rootUrl: string): ShadowOnlyMaterial {
            return SerializationHelper.Parse(() => new ShadowOnlyMaterial(source.name, scene), source, scene, rootUrl);
        }
    }
}