Babylon.js/Babylon/Particles/babylon.particleSystem.js

var BABYLON;
(function (BABYLON) {
    var randomNumber = function (min, max) {
        if (min == max) {
            return (min);
        }

        var random = Math.random();

        return ((random * (max - min)) + min);
    };

    var ParticleSystem = (function () {
        function ParticleSystem(name, capacity, scene) {
            var _this = this;
            this.name = name;
            this.renderingGroupId = 0;
            this.emitter = null;
            this.emitRate = 10;
            this.manualEmitCount = -1;
            this.updateSpeed = 0.01;
            this.targetStopDuration = 0;
            this.disposeOnStop = false;
            this.minEmitPower = 1;
            this.maxEmitPower = 1;
            this.minLifeTime = 1;
            this.maxLifeTime = 1;
            this.minSize = 1;
            this.maxSize = 1;
            this.minAngularSpeed = 0;
            this.maxAngularSpeed = 0;
            this.blendMode = BABYLON.ParticleSystem.BLENDMODE_ONEONE;
            this.forceDepthWrite = false;
            this.gravity = BABYLON.Vector3.Zero();
            this.direction1 = new BABYLON.Vector3(0, 1.0, 0);
            this.direction2 = new BABYLON.Vector3(0, 1.0, 0);
            this.minEmitBox = new BABYLON.Vector3(-0.5, -0.5, -0.5);
            this.maxEmitBox = new BABYLON.Vector3(0.5, 0.5, 0.5);
            this.color1 = new BABYLON.Color4(1.0, 1.0, 1.0, 1.0);
            this.color2 = new BABYLON.Color4(1.0, 1.0, 1.0, 1.0);
            this.colorDead = new BABYLON.Color4(0, 0, 0, 1.0);
            this.textureMask = new BABYLON.Color4(1.0, 1.0, 1.0, 1.0);
            this.particles = new Array();
            this._vertexDeclaration = [3, 4, 4];
            this._vertexStrideSize = 11 * 4;
            this._stockParticles = new Array();
            this._newPartsExcess = 0;
            this._scaledColorStep = new BABYLON.Color4(0, 0, 0, 0);
            this._colorDiff = new BABYLON.Color4(0, 0, 0, 0);
            this._scaledDirection = BABYLON.Vector3.Zero();
            this._scaledGravity = BABYLON.Vector3.Zero();
            this._currentRenderId = -1;
            this._started = false;
            this._stopped = false;
            this._actualFrame = 0;
            this.id = name;
            this._capacity = capacity;

            this._scene = scene;

            scene.particleSystems.push(this);

            // VBO
            this._vertexBuffer = scene.getEngine().createDynamicVertexBuffer(capacity * this._vertexStrideSize * 4);

            var indices = [];
            var index = 0;
            for (var count = 0; count < capacity; count++) {
                indices.push(index);
                indices.push(index + 1);
                indices.push(index + 2);
                indices.push(index);
                indices.push(index + 2);
                indices.push(index + 3);
                index += 4;
            }

            this._indexBuffer = scene.getEngine().createIndexBuffer(indices);

            this._vertices = new Float32Array(capacity * this._vertexStrideSize);

            // Default behaviors
            this.startDirectionFunction = function (emitPower, worldMatrix, directionToUpdate) {
                var randX = randomNumber(_this.direction1.x, _this.direction2.x);
                var randY = randomNumber(_this.direction1.y, _this.direction2.y);
                var randZ = randomNumber(_this.direction1.z, _this.direction2.z);

                BABYLON.Vector3.TransformNormalFromFloatsToRef(randX * emitPower, randY * emitPower, randZ * emitPower, worldMatrix, directionToUpdate);
            };

            this.startPositionFunction = function (worldMatrix, positionToUpdate) {
                var randX = randomNumber(_this.minEmitBox.x, _this.maxEmitBox.x);
                var randY = randomNumber(_this.minEmitBox.y, _this.maxEmitBox.y);
                var randZ = randomNumber(_this.minEmitBox.z, _this.maxEmitBox.z);

                BABYLON.Vector3.TransformCoordinatesFromFloatsToRef(randX, randY, randZ, worldMatrix, positionToUpdate);
            };
        }
        ParticleSystem.prototype.getCapacity = function () {
            return this._capacity;
        };

        ParticleSystem.prototype.isAlive = function () {
            return this._alive;
        };

        ParticleSystem.prototype.isStarted = function () {
            return this._started;
        };

        ParticleSystem.prototype.start = function () {
            this._started = true;
            this._stopped = false;
            this._actualFrame = 0;
        };

        ParticleSystem.prototype.stop = function () {
            this._stopped = true;
        };

        ParticleSystem.prototype._appendParticleVertex = function (index, particle, offsetX, offsetY) {
            var offset = index * 11;
            this._vertices[offset] = particle.position.x;
            this._vertices[offset + 1] = particle.position.y;
            this._vertices[offset + 2] = particle.position.z;
            this._vertices[offset + 3] = particle.color.r;
            this._vertices[offset + 4] = particle.color.g;
            this._vertices[offset + 5] = particle.color.b;
            this._vertices[offset + 6] = particle.color.a;
            this._vertices[offset + 7] = particle.angle;
            this._vertices[offset + 8] = particle.size;
            this._vertices[offset + 9] = offsetX;
            this._vertices[offset + 10] = offsetY;
        };

        ParticleSystem.prototype._update = function (newParticles) {
            // Update current
            this._alive = this.particles.length > 0;
            for (var index = 0; index < this.particles.length; index++) {
                var particle = this.particles[index];
                particle.age += this._scaledUpdateSpeed;

                if (particle.age >= particle.lifeTime) {
                    this._stockParticles.push(this.particles.splice(index, 1)[0]);
                    index--;
                    continue;
                } else {
                    particle.colorStep.scaleToRef(this._scaledUpdateSpeed, this._scaledColorStep);
                    particle.color.addInPlace(this._scaledColorStep);

                    if (particle.color.a < 0)
                        particle.color.a = 0;

                    particle.direction.scaleToRef(this._scaledUpdateSpeed, this._scaledDirection);
                    particle.position.addInPlace(this._scaledDirection);

                    particle.angle += particle.angularSpeed * this._scaledUpdateSpeed;

                    this.gravity.scaleToRef(this._scaledUpdateSpeed, this._scaledGravity);
                    particle.direction.addInPlace(this._scaledGravity);
                }
            }

            // Add new ones
            var worldMatrix;

            if (this.emitter.position) {
                worldMatrix = this.emitter.getWorldMatrix();
            } else {
                worldMatrix = BABYLON.Matrix.Translation(this.emitter.x, this.emitter.y, this.emitter.z);
            }

            for (index = 0; index < newParticles; index++) {
                if (this.particles.length == this._capacity) {
                    break;
                }

                if (this._stockParticles.length !== 0) {
                    particle = this._stockParticles.pop();
                    particle.age = 0;
                } else {
                    particle = new BABYLON.Particle();
                }
                this.particles.push(particle);

                var emitPower = randomNumber(this.minEmitPower, this.maxEmitPower);

                this.startDirectionFunction(emitPower, worldMatrix, particle.direction);

                particle.lifeTime = randomNumber(this.minLifeTime, this.maxLifeTime);

                particle.size = randomNumber(this.minSize, this.maxSize);
                particle.angularSpeed = randomNumber(this.minAngularSpeed, this.maxAngularSpeed);

                this.startPositionFunction(worldMatrix, particle.position);

                var step = randomNumber(0, 1.0);

                BABYLON.Color4.LerpToRef(this.color1, this.color2, step, particle.color);

                this.colorDead.subtractToRef(particle.color, this._colorDiff);
                this._colorDiff.scaleToRef(1.0 / particle.lifeTime, particle.colorStep);
            }
        };

        ParticleSystem.prototype._getEffect = function () {
            var defines = [];

            if (this._scene.clipPlane) {
                defines.push("#define CLIPPLANE");
            }

            // Effect
            var join = defines.join("\n");
            if (this._cachedDefines != join) {
                this._cachedDefines = join;
                this._effect = this._scene.getEngine().createEffect("particles", ["position", "color", "options"], ["invView", "view", "projection", "vClipPlane", "textureMask"], ["diffuseSampler"], join);
            }

            return this._effect;
        };

        ParticleSystem.prototype.animate = function () {
            if (!this._started)
                return;

            var effect = this._getEffect();

            // Check
            if (!this.emitter || !effect.isReady() || !this.particleTexture || !this.particleTexture.isReady())
                return;

            if (this._currentRenderId === this._scene.getRenderId()) {
                return;
            }

            this._currentRenderId = this._scene.getRenderId();

            this._scaledUpdateSpeed = this.updateSpeed * this._scene.getAnimationRatio();

            // determine the number of particles we need to create
            var emitCout;

            if (this.manualEmitCount > -1) {
                emitCout = this.manualEmitCount;
                this.manualEmitCount = 0;
            } else {
                emitCout = this.emitRate;
            }

            var newParticles = ((emitCout * this._scaledUpdateSpeed) >> 0);
            this._newPartsExcess += emitCout * this._scaledUpdateSpeed - newParticles;

            if (this._newPartsExcess > 1.0) {
                newParticles += this._newPartsExcess >> 0;
                this._newPartsExcess -= this._newPartsExcess >> 0;
            }

            this._alive = false;

            if (!this._stopped) {
                this._actualFrame += this._scaledUpdateSpeed;

                if (this.targetStopDuration && this._actualFrame >= this.targetStopDuration)
                    this.stop();
            } else {
                newParticles = 0;
            }

            this._update(newParticles);

            // Stopped?
            if (this._stopped) {
                if (!this._alive) {
                    this._started = false;
                    if (this.disposeOnStop) {
                        this._scene._toBeDisposed.push(this);
                    }
                }
            }

            // Update VBO
            var offset = 0;
            for (var index = 0; index < this.particles.length; index++) {
                var particle = this.particles[index];

                this._appendParticleVertex(offset++, particle, 0, 0);
                this._appendParticleVertex(offset++, particle, 1, 0);
                this._appendParticleVertex(offset++, particle, 1, 1);
                this._appendParticleVertex(offset++, particle, 0, 1);
            }
            var engine = this._scene.getEngine();
            engine.updateDynamicVertexBuffer(this._vertexBuffer, this._vertices, this.particles.length * this._vertexStrideSize);
        };

        ParticleSystem.prototype.render = function () {
            var effect = this._getEffect();

            // Check
            if (!this.emitter || !effect.isReady() || !this.particleTexture || !this.particleTexture.isReady() || !this.particles.length)
                return 0;

            var engine = this._scene.getEngine();

            // Render
            engine.enableEffect(effect);

            var viewMatrix = this._scene.getViewMatrix();
            effect.setTexture("diffuseSampler", this.particleTexture);
            effect.setMatrix("view", viewMatrix);
            effect.setMatrix("projection", this._scene.getProjectionMatrix());
            effect.setFloat4("textureMask", this.textureMask.r, this.textureMask.g, this.textureMask.b, this.textureMask.a);

            if (this._scene.clipPlane) {
                var clipPlane = this._scene.clipPlane;
                var invView = viewMatrix.clone();
                invView.invert();
                effect.setMatrix("invView", invView);
                effect.setFloat4("vClipPlane", clipPlane.normal.x, clipPlane.normal.y, clipPlane.normal.z, clipPlane.d);
            }

            // VBOs
            engine.bindBuffers(this._vertexBuffer, this._indexBuffer, this._vertexDeclaration, this._vertexStrideSize, effect);

            // Draw order
            if (this.blendMode === BABYLON.ParticleSystem.BLENDMODE_ONEONE) {
                engine.setAlphaMode(BABYLON.Engine.ALPHA_ADD);
            } else {
                engine.setAlphaMode(BABYLON.Engine.ALPHA_COMBINE);
            }

            if (this.forceDepthWrite) {
                engine.setDepthWrite(true);
            }

            engine.draw(true, 0, this.particles.length * 6);
            engine.setAlphaMode(BABYLON.Engine.ALPHA_DISABLE);

            return this.particles.length;
        };

        ParticleSystem.prototype.dispose = function () {
            if (this._vertexBuffer) {
                this._scene.getEngine()._releaseBuffer(this._vertexBuffer);
                this._vertexBuffer = null;
            }

            if (this._indexBuffer) {
                this._scene.getEngine()._releaseBuffer(this._indexBuffer);
                this._indexBuffer = null;
            }

            if (this.particleTexture) {
                this.particleTexture.dispose();
                this.particleTexture = null;
            }

            // Remove from scene
            var index = this._scene.particleSystems.indexOf(this);
            this._scene.particleSystems.splice(index, 1);

            // Callback
            if (this.onDispose) {
                this.onDispose();
            }
        };

        // Clone
        ParticleSystem.prototype.clone = function (name, newEmitter) {
            var result = new BABYLON.ParticleSystem(name, this._capacity, this._scene);

            BABYLON.Tools.DeepCopy(this, result, ["particles"], ["_vertexDeclaration", "_vertexStrideSize"]);

            if (newEmitter === undefined) {
                newEmitter = this.emitter;
            }

            result.emitter = newEmitter;
            if (this.particleTexture) {
                result.particleTexture = new BABYLON.Texture(this.particleTexture.url, this._scene);
            }

            result.start();

            return result;
        };
        ParticleSystem.BLENDMODE_ONEONE = 0;
        ParticleSystem.BLENDMODE_STANDARD = 1;
        return ParticleSystem;
    })();
    BABYLON.ParticleSystem = ParticleSystem;
})(BABYLON || (BABYLON = {}));
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