| 1 |
- {"ast":null,"code":"import { FactorGradient, ColorGradient, GradientHelper } from \"../Misc/gradients.js\";\nimport { Observable } from \"../Misc/observable.js\";\nimport { Vector3, Matrix, TmpVectors } from \"../Maths/math.vector.js\";\nimport { Color4, TmpColors } from \"../Maths/math.color.js\";\nimport { Lerp } from \"../Maths/math.scalar.functions.js\";\nimport { VertexBuffer, Buffer } from \"../Buffers/buffer.js\";\nimport { BaseParticleSystem } from \"./baseParticleSystem.js\";\nimport { ParticleSystem } from \"./particleSystem.js\";\nimport { BoxParticleEmitter } from \"../Particles/EmitterTypes/boxParticleEmitter.js\";\nimport { ImageProcessingConfiguration } from \"../Materials/imageProcessingConfiguration.js\";\nimport { RawTexture } from \"../Materials/Textures/rawTexture.js\";\nimport { EngineStore } from \"../Engines/engineStore.js\";\nimport { CustomParticleEmitter } from \"./EmitterTypes/customParticleEmitter.js\";\nimport { AbstractEngine } from \"../Engines/abstractEngine.js\";\nimport { DrawWrapper } from \"../Materials/drawWrapper.js\";\nimport { GetClass } from \"../Misc/typeStore.js\";\nimport { addClipPlaneUniforms, bindClipPlane, prepareStringDefinesForClipPlanes } from \"../Materials/clipPlaneMaterialHelper.js\";\nimport { Scene } from \"../scene.js\";\nimport \"../Engines/Extensions/engine.transformFeedback.js\";\nimport \"../Shaders/gpuRenderParticles.fragment.js\";\nimport \"../Shaders/gpuRenderParticles.vertex.js\";\nimport { BindFogParameters, BindLogDepth } from \"../Materials/materialHelper.functions.js\";\nimport { CreateConeEmitter, CreateCylinderEmitter, CreateDirectedCylinderEmitter, CreateDirectedSphereEmitter, CreateDirectedConeEmitter, CreateHemisphericEmitter, CreatePointEmitter, CreateSphereEmitter } from \"./particleSystem.functions.js\";\n/**\n * This represents a GPU particle system in Babylon\n * This is the fastest particle system in Babylon as it uses the GPU to update the individual particle data\n * @see https://www.babylonjs-playground.com/#PU4WYI#4\n */\nexport class GPUParticleSystem extends BaseParticleSystem {\n /**\n * Gets a boolean indicating if the GPU particles can be rendered on current browser\n */\n static get IsSupported() {\n if (!EngineStore.LastCreatedEngine) {\n return false;\n }\n const caps = EngineStore.LastCreatedEngine.getCaps();\n return caps.supportTransformFeedbacks || caps.supportComputeShaders;\n }\n _createIndexBuffer() {\n this._linesIndexBufferUseInstancing = this._engine.createIndexBuffer(new Uint32Array([0, 1, 1, 3, 3, 2, 2, 0, 0, 3]), undefined, \"GPUParticleSystemLinesIndexBuffer\");\n }\n /**\n * Gets the maximum number of particles active at the same time.\n * @returns The max number of active particles.\n */\n getCapacity() {\n return this._capacity;\n }\n /**\n * Gets or set the number of active particles\n * The value cannot be greater than \"capacity\" (if it is, it will be limited to \"capacity\").\n */\n get maxActiveParticleCount() {\n return this._maxActiveParticleCount;\n }\n set maxActiveParticleCount(value) {\n this._maxActiveParticleCount = Math.min(value, this._capacity);\n }\n /**\n * Gets or set the number of active particles\n * @deprecated Please use maxActiveParticleCount instead.\n */\n get activeParticleCount() {\n return this.maxActiveParticleCount;\n }\n set activeParticleCount(value) {\n this.maxActiveParticleCount = value;\n }\n /**\n * Creates a Point Emitter for the particle system (emits directly from the emitter position)\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the box\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the box\n * @returns the emitter\n */\n createPointEmitter(direction1, direction2) {\n const particleEmitter = CreatePointEmitter(direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Hemisphere Emitter for the particle system (emits along the hemisphere radius)\n * @param radius The radius of the hemisphere to emit from\n * @param radiusRange The range of the hemisphere to emit from [0-1] 0 Surface Only, 1 Entire Radius\n * @returns the emitter\n */\n createHemisphericEmitter(radius = 1, radiusRange = 1) {\n const particleEmitter = CreateHemisphericEmitter(radius, radiusRange);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Sphere Emitter for the particle system (emits along the sphere radius)\n * @param radius The radius of the sphere to emit from\n * @param radiusRange The range of the sphere to emit from [0-1] 0 Surface Only, 1 Entire Radius\n * @returns the emitter\n */\n createSphereEmitter(radius = 1, radiusRange = 1) {\n const particleEmitter = CreateSphereEmitter(radius, radiusRange);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Directed Sphere Emitter for the particle system (emits between direction1 and direction2)\n * @param radius The radius of the sphere to emit from\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the sphere\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the sphere\n * @returns the emitter\n */\n createDirectedSphereEmitter(radius = 1, direction1 = new Vector3(0, 1.0, 0), direction2 = new Vector3(0, 1.0, 0)) {\n const particleEmitter = CreateDirectedSphereEmitter(radius, direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Cylinder Emitter for the particle system (emits from the cylinder to the particle position)\n * @param radius The radius of the emission cylinder\n * @param height The height of the emission cylinder\n * @param radiusRange The range of emission [0-1] 0 Surface only, 1 Entire Radius\n * @param directionRandomizer How much to randomize the particle direction [0-1]\n * @returns the emitter\n */\n createCylinderEmitter(radius = 1, height = 1, radiusRange = 1, directionRandomizer = 0) {\n const particleEmitter = CreateCylinderEmitter(radius, height, radiusRange, directionRandomizer);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Directed Cylinder Emitter for the particle system (emits between direction1 and direction2)\n * @param radius The radius of the cylinder to emit from\n * @param height The height of the emission cylinder\n * @param radiusRange the range of the emission cylinder [0-1] 0 Surface only, 1 Entire Radius (1 by default)\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the cylinder\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the cylinder\n * @returns the emitter\n */\n createDirectedCylinderEmitter(radius = 1, height = 1, radiusRange = 1, direction1 = new Vector3(0, 1.0, 0), direction2 = new Vector3(0, 1.0, 0)) {\n const particleEmitter = CreateDirectedCylinderEmitter(radius, height, radiusRange, direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Cone Emitter for the particle system (emits from the cone to the particle position)\n * @param radius The radius of the cone to emit from\n * @param angle The base angle of the cone\n * @returns the emitter\n */\n createConeEmitter(radius = 1, angle = Math.PI / 4) {\n const particleEmitter = CreateConeEmitter(radius, angle);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n createDirectedConeEmitter(radius = 1, angle = Math.PI / 4, direction1 = new Vector3(0, 1.0, 0), direction2 = new Vector3(0, 1.0, 0)) {\n const particleEmitter = CreateDirectedConeEmitter(radius, angle, direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Box Emitter for the particle system. (emits between direction1 and direction2 from withing the box defined by minEmitBox and maxEmitBox)\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the box\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the box\n * @param minEmitBox Particles are emitted from the box between minEmitBox and maxEmitBox\n * @param maxEmitBox Particles are emitted from the box between minEmitBox and maxEmitBox\n * @returns the emitter\n */\n createBoxEmitter(direction1, direction2, minEmitBox, maxEmitBox) {\n const particleEmitter = new BoxParticleEmitter();\n this.particleEmitterType = particleEmitter;\n this.direction1 = direction1;\n this.direction2 = direction2;\n this.minEmitBox = minEmitBox;\n this.maxEmitBox = maxEmitBox;\n return particleEmitter;\n }\n /**\n * Is this system ready to be used/rendered\n * @returns true if the system is ready\n */\n isReady() {\n if (!this.emitter || this._imageProcessingConfiguration && !this._imageProcessingConfiguration.isReady() || !this.particleTexture || !this.particleTexture.isReady() || this._rebuildingAfterContextLost) {\n return false;\n }\n if (this.blendMode !== ParticleSystem.BLENDMODE_MULTIPLYADD) {\n if (!this._getWrapper(this.blendMode).effect.isReady()) {\n return false;\n }\n } else {\n if (!this._getWrapper(ParticleSystem.BLENDMODE_MULTIPLY).effect.isReady()) {\n return false;\n }\n if (!this._getWrapper(ParticleSystem.BLENDMODE_ADD).effect.isReady()) {\n return false;\n }\n }\n if (!this._platform.isUpdateBufferCreated()) {\n this._recreateUpdateEffect();\n return false;\n }\n return this._platform.isUpdateBufferReady();\n }\n /**\n * Gets if the system has been started. (Note: this will still be true after stop is called)\n * @returns True if it has been started, otherwise false.\n */\n isStarted() {\n return this._started;\n }\n /**\n * Gets if the system has been stopped. (Note: rendering is still happening but the system is frozen)\n * @returns True if it has been stopped, otherwise false.\n */\n isStopped() {\n return this._stopped;\n }\n /**\n * Gets a boolean indicating that the system is stopping\n * @returns true if the system is currently stopping\n */\n isStopping() {\n return false; // Stop is immediate on GPU\n }\n /**\n * Gets the number of particles active at the same time.\n * @returns The number of active particles.\n */\n getActiveCount() {\n return this._currentActiveCount;\n }\n /**\n * Starts the particle system and begins to emit\n * @param delay defines the delay in milliseconds before starting the system (this.startDelay by default)\n */\n start(delay = this.startDelay) {\n if (!this.targetStopDuration && this._hasTargetStopDurationDependantGradient()) {\n // eslint-disable-next-line no-throw-literal\n throw \"Particle system started with a targetStopDuration dependant gradient (eg. startSizeGradients) but no targetStopDuration set\";\n }\n if (delay) {\n setTimeout(() => {\n this.start(0);\n }, delay);\n return;\n }\n this._started = true;\n this._stopped = false;\n this._preWarmDone = false;\n // Animations\n if (this.beginAnimationOnStart && this.animations && this.animations.length > 0 && this._scene) {\n this._scene.beginAnimation(this, this.beginAnimationFrom, this.beginAnimationTo, this.beginAnimationLoop);\n }\n }\n /**\n * Stops the particle system.\n */\n stop() {\n if (this._stopped) {\n return;\n }\n this.onStoppedObservable.notifyObservers(this);\n this._stopped = true;\n }\n /**\n * Remove all active particles\n */\n reset() {\n this._releaseBuffers();\n this._platform.releaseVertexBuffers();\n this._currentActiveCount = 0;\n this._targetIndex = 0;\n }\n /**\n * Returns the string \"GPUParticleSystem\"\n * @returns a string containing the class name\n */\n getClassName() {\n return \"GPUParticleSystem\";\n }\n /**\n * Gets the custom effect used to render the particles\n * @param blendMode Blend mode for which the effect should be retrieved\n * @returns The effect\n */\n getCustomEffect(blendMode = 0) {\n var _this$_customWrappers, _this$_customWrappers2;\n return (_this$_customWrappers = (_this$_customWrappers2 = this._customWrappers[blendMode]) === null || _this$_customWrappers2 === void 0 ? void 0 : _this$_customWrappers2.effect) !== null && _this$_customWrappers !== void 0 ? _this$_customWrappers : this._customWrappers[0].effect;\n }\n _getCustomDrawWrapper(blendMode = 0) {\n var _this$_customWrappers3;\n return (_this$_customWrappers3 = this._customWrappers[blendMode]) !== null && _this$_customWrappers3 !== void 0 ? _this$_customWrappers3 : this._customWrappers[0];\n }\n /**\n * Sets the custom effect used to render the particles\n * @param effect The effect to set\n * @param blendMode Blend mode for which the effect should be set\n */\n setCustomEffect(effect, blendMode = 0) {\n this._customWrappers[blendMode] = new DrawWrapper(this._engine);\n this._customWrappers[blendMode].effect = effect;\n }\n /**\n * Observable that will be called just before the particles are drawn\n */\n get onBeforeDrawParticlesObservable() {\n if (!this._onBeforeDrawParticlesObservable) {\n this._onBeforeDrawParticlesObservable = new Observable();\n }\n return this._onBeforeDrawParticlesObservable;\n }\n /**\n * Gets the name of the particle vertex shader\n */\n get vertexShaderName() {\n return \"gpuRenderParticles\";\n }\n /**\n * Gets the vertex buffers used by the particle system\n * Should be called after render() has been called for the current frame so that the buffers returned are the ones that have been updated\n * in the current frame (there's a ping-pong between two sets of buffers - for a given frame, one set is used as the source and the other as the destination)\n */\n get vertexBuffers() {\n // We return the other buffers than those corresponding to this._targetIndex because it is assumed vertexBuffers will be called in the current frame\n // after render() has been called, meaning that the buffers have already been swapped and this._targetIndex points to the buffers that will be updated\n // in the next frame (and which are the sources in this frame) and (this._targetIndex ^ 1) points to the buffers that have been updated this frame\n // (and that will be the source buffers in the next frame)\n return this._renderVertexBuffers[this._targetIndex ^ 1];\n }\n /**\n * Gets the index buffer used by the particle system (null for GPU particle systems)\n */\n get indexBuffer() {\n return null;\n }\n _removeGradientAndTexture(gradient, gradients, texture) {\n super._removeGradientAndTexture(gradient, gradients, texture);\n this._releaseBuffers();\n return this;\n }\n /**\n * Adds a new color gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param color1 defines the color to affect to the specified gradient\n * @returns the current particle system\n */\n addColorGradient(gradient, color1) {\n if (!this._colorGradients) {\n this._colorGradients = [];\n }\n const colorGradient = new ColorGradient(gradient, color1);\n this._colorGradients.push(colorGradient);\n this._refreshColorGradient(true);\n this._releaseBuffers();\n return this;\n }\n _refreshColorGradient(reorder = false) {\n if (this._colorGradients) {\n if (reorder) {\n this._colorGradients.sort((a, b) => {\n if (a.gradient < b.gradient) {\n return -1;\n } else if (a.gradient > b.gradient) {\n return 1;\n }\n return 0;\n });\n }\n if (this._colorGradientsTexture) {\n this._colorGradientsTexture.dispose();\n this._colorGradientsTexture = null;\n }\n }\n }\n /** Force the system to rebuild all gradients that need to be resync */\n forceRefreshGradients() {\n this._refreshColorGradient();\n this._refreshFactorGradient(this._sizeGradients, \"_sizeGradientsTexture\");\n this._refreshFactorGradient(this._angularSpeedGradients, \"_angularSpeedGradientsTexture\");\n this._refreshFactorGradient(this._velocityGradients, \"_velocityGradientsTexture\");\n this._refreshFactorGradient(this._limitVelocityGradients, \"_limitVelocityGradientsTexture\");\n this._refreshFactorGradient(this._dragGradients, \"_dragGradientsTexture\");\n this.reset();\n }\n /**\n * Remove a specific color gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeColorGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._colorGradients, this._colorGradientsTexture);\n this._colorGradientsTexture = null;\n return this;\n }\n /**\n * Resets the draw wrappers cache\n */\n resetDrawCache() {\n for (const blendMode in this._drawWrappers) {\n var _drawWrapper$drawCont;\n const drawWrapper = this._drawWrappers[blendMode];\n (_drawWrapper$drawCont = drawWrapper.drawContext) === null || _drawWrapper$drawCont === void 0 || _drawWrapper$drawCont.reset();\n }\n }\n _addFactorGradient(factorGradients, gradient, factor) {\n const valueGradient = new FactorGradient(gradient, factor);\n factorGradients.push(valueGradient);\n this._releaseBuffers();\n }\n /**\n * Adds a new size gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the size factor to affect to the specified gradient\n * @returns the current particle system\n */\n addSizeGradient(gradient, factor) {\n if (!this._sizeGradients) {\n this._sizeGradients = [];\n }\n this._addFactorGradient(this._sizeGradients, gradient, factor);\n this._refreshFactorGradient(this._sizeGradients, \"_sizeGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific size gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeSizeGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._sizeGradients, this._sizeGradientsTexture);\n this._sizeGradientsTexture = null;\n return this;\n }\n _refreshFactorGradient(factorGradients, textureName, reorder = false) {\n if (!factorGradients) {\n return;\n }\n if (reorder) {\n factorGradients.sort((a, b) => {\n if (a.gradient < b.gradient) {\n return -1;\n } else if (a.gradient > b.gradient) {\n return 1;\n }\n return 0;\n });\n }\n const that = this;\n if (that[textureName]) {\n that[textureName].dispose();\n that[textureName] = null;\n }\n }\n /**\n * Adds a new angular speed gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the angular speed to affect to the specified gradient\n * @returns the current particle system\n */\n addAngularSpeedGradient(gradient, factor) {\n if (!this._angularSpeedGradients) {\n this._angularSpeedGradients = [];\n }\n this._addFactorGradient(this._angularSpeedGradients, gradient, factor);\n this._refreshFactorGradient(this._angularSpeedGradients, \"_angularSpeedGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific angular speed gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeAngularSpeedGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._angularSpeedGradients, this._angularSpeedGradientsTexture);\n this._angularSpeedGradientsTexture = null;\n return this;\n }\n /**\n * Adds a new velocity gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the velocity to affect to the specified gradient\n * @returns the current particle system\n */\n addVelocityGradient(gradient, factor) {\n if (!this._velocityGradients) {\n this._velocityGradients = [];\n }\n this._addFactorGradient(this._velocityGradients, gradient, factor);\n this._refreshFactorGradient(this._velocityGradients, \"_velocityGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific velocity gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeVelocityGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._velocityGradients, this._velocityGradientsTexture);\n this._velocityGradientsTexture = null;\n return this;\n }\n /**\n * Adds a new limit velocity gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the limit velocity value to affect to the specified gradient\n * @returns the current particle system\n */\n addLimitVelocityGradient(gradient, factor) {\n if (!this._limitVelocityGradients) {\n this._limitVelocityGradients = [];\n }\n this._addFactorGradient(this._limitVelocityGradients, gradient, factor);\n this._refreshFactorGradient(this._limitVelocityGradients, \"_limitVelocityGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific limit velocity gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeLimitVelocityGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._limitVelocityGradients, this._limitVelocityGradientsTexture);\n this._limitVelocityGradientsTexture = null;\n return this;\n }\n /**\n * Adds a new drag gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the drag value to affect to the specified gradient\n * @returns the current particle system\n */\n addDragGradient(gradient, factor) {\n if (!this._dragGradients) {\n this._dragGradients = [];\n }\n this._addFactorGradient(this._dragGradients, gradient, factor);\n this._refreshFactorGradient(this._dragGradients, \"_dragGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific drag gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeDragGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._dragGradients, this._dragGradientsTexture);\n this._dragGradientsTexture = null;\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addEmitRateGradient() {\n // Do nothing as emit rate is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeEmitRateGradient() {\n // Do nothing as emit rate is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addStartSizeGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeStartSizeGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addColorRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeColorRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addAlphaRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeAlphaRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addRampGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeRampGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the list of ramp gradients\n */\n getRampGradients() {\n return null;\n }\n /**\n * Not supported by GPUParticleSystem\n * Gets or sets a boolean indicating that ramp gradients must be used\n * @see https://doc.babylonjs.com/features/featuresDeepDive/particles/particle_system/particle_system_intro#ramp-gradients\n */\n get useRampGradients() {\n //Not supported by GPUParticleSystem\n return false;\n }\n set useRampGradients(value) {\n //Not supported by GPUParticleSystem\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addLifeTimeGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeLifeTimeGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Instantiates a GPU particle system.\n * Particles are often small sprites used to simulate hard-to-reproduce phenomena like fire, smoke, water, or abstract visual effects like magic glitter and faery dust.\n * @param name The name of the particle system\n * @param options The options used to create the system\n * @param sceneOrEngine The scene the particle system belongs to or the engine to use if no scene\n * @param customEffect a custom effect used to change the way particles are rendered by default\n * @param isAnimationSheetEnabled Must be true if using a spritesheet to animate the particles texture\n */\n constructor(name, options, sceneOrEngine, customEffect = null, isAnimationSheetEnabled = false) {\n var _options;\n super(name);\n /**\n * The layer mask we are rendering the particles through.\n */\n this.layerMask = 0x0fffffff;\n this._accumulatedCount = 0;\n this._renderVertexBuffers = [];\n this._targetIndex = 0;\n this._currentRenderId = -1;\n this._currentRenderingCameraUniqueId = -1;\n this._started = false;\n this._stopped = false;\n this._timeDelta = 0;\n /** Indicates that the update of particles is done in the animate function (and not in render). Default: false */\n this.updateInAnimate = false;\n this._actualFrame = 0;\n this._rawTextureWidth = 256;\n this._rebuildingAfterContextLost = false;\n /**\n * An event triggered when the system is disposed.\n */\n this.onDisposeObservable = new Observable();\n /**\n * An event triggered when the system is stopped\n */\n this.onStoppedObservable = new Observable();\n /**\n * Forces the particle to write their depth information to the depth buffer. This can help preventing other draw calls\n * to override the particles.\n */\n this.forceDepthWrite = false;\n this._preWarmDone = false;\n /**\n * Specifies if the particles are updated in emitter local space or world space.\n */\n this.isLocal = false;\n /** Indicates that the particle system is GPU based */\n this.isGPU = true;\n /** @internal */\n this._onBeforeDrawParticlesObservable = null;\n if (!sceneOrEngine || sceneOrEngine.getClassName() === \"Scene\") {\n this._scene = sceneOrEngine || EngineStore.LastCreatedScene;\n this._engine = this._scene.getEngine();\n this.uniqueId = this._scene.getUniqueId();\n this._scene.particleSystems.push(this);\n } else {\n this._engine = sceneOrEngine;\n this.defaultProjectionMatrix = Matrix.PerspectiveFovLH(0.8, 1, 0.1, 100, this._engine.isNDCHalfZRange);\n }\n if (this._engine.getCaps().supportComputeShaders) {\n if (!GetClass(\"BABYLON.ComputeShaderParticleSystem\")) {\n throw new Error(\"The ComputeShaderParticleSystem class is not available! Make sure you have imported it.\");\n }\n this._platform = new (GetClass(\"BABYLON.ComputeShaderParticleSystem\"))(this, this._engine);\n } else {\n if (!GetClass(\"BABYLON.WebGL2ParticleSystem\")) {\n throw new Error(\"The WebGL2ParticleSystem class is not available! Make sure you have imported it.\");\n }\n this._platform = new (GetClass(\"BABYLON.WebGL2ParticleSystem\"))(this, this._engine);\n }\n this._customWrappers = {\n 0: new DrawWrapper(this._engine)\n };\n this._customWrappers[0].effect = customEffect;\n this._drawWrappers = {\n 0: new DrawWrapper(this._engine)\n };\n if (this._drawWrappers[0].drawContext) {\n this._drawWrappers[0].drawContext.useInstancing = true;\n }\n this._createIndexBuffer();\n // Setup the default processing configuration to the scene.\n this._attachImageProcessingConfiguration(null);\n options = (_options = options) !== null && _options !== void 0 ? _options : {};\n if (!options.randomTextureSize) {\n delete options.randomTextureSize;\n }\n const fullOptions = {\n capacity: 50000,\n randomTextureSize: this._engine.getCaps().maxTextureSize,\n ...options\n };\n const optionsAsNumber = options;\n if (isFinite(optionsAsNumber)) {\n fullOptions.capacity = optionsAsNumber;\n }\n this._capacity = fullOptions.capacity;\n this._maxActiveParticleCount = fullOptions.capacity;\n this._currentActiveCount = 0;\n this._isAnimationSheetEnabled = isAnimationSheetEnabled;\n this.particleEmitterType = new BoxParticleEmitter();\n // Random data\n const maxTextureSize = Math.min(this._engine.getCaps().maxTextureSize, fullOptions.randomTextureSize);\n let d = [];\n for (let i = 0; i < maxTextureSize; ++i) {\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n }\n this._randomTexture = new RawTexture(new Float32Array(d), maxTextureSize, 1, 5, sceneOrEngine, false, false, 1, 1);\n this._randomTexture.name = \"GPUParticleSystem_random1\";\n this._randomTexture.wrapU = 1;\n this._randomTexture.wrapV = 1;\n d = [];\n for (let i = 0; i < maxTextureSize; ++i) {\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n }\n this._randomTexture2 = new RawTexture(new Float32Array(d), maxTextureSize, 1, 5, sceneOrEngine, false, false, 1, 1);\n this._randomTexture2.name = \"GPUParticleSystem_random2\";\n this._randomTexture2.wrapU = 1;\n this._randomTexture2.wrapV = 1;\n this._randomTextureSize = maxTextureSize;\n }\n _reset() {\n this._releaseBuffers();\n }\n _createVertexBuffers(updateBuffer, renderBuffer, spriteSource) {\n const renderVertexBuffers = {};\n renderVertexBuffers[\"position\"] = renderBuffer.createVertexBuffer(\"position\", 0, 3, this._attributesStrideSize, true);\n let offset = 3;\n renderVertexBuffers[\"age\"] = renderBuffer.createVertexBuffer(\"age\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n renderVertexBuffers[\"size\"] = renderBuffer.createVertexBuffer(\"size\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n renderVertexBuffers[\"life\"] = renderBuffer.createVertexBuffer(\"life\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n offset += 4; // seed\n if (this.billboardMode === ParticleSystem.BILLBOARDMODE_STRETCHED) {\n renderVertexBuffers[\"direction\"] = renderBuffer.createVertexBuffer(\"direction\", offset, 3, this._attributesStrideSize, true);\n }\n offset += 3; // direction\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n if (this.particleEmitterType instanceof CustomParticleEmitter) {\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n }\n if (!this._colorGradientsTexture) {\n renderVertexBuffers[\"color\"] = renderBuffer.createVertexBuffer(\"color\", offset, 4, this._attributesStrideSize, true);\n offset += 4;\n }\n if (!this._isBillboardBased) {\n renderVertexBuffers[\"initialDirection\"] = renderBuffer.createVertexBuffer(\"initialDirection\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n }\n if (this.noiseTexture) {\n renderVertexBuffers[\"noiseCoordinates1\"] = renderBuffer.createVertexBuffer(\"noiseCoordinates1\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n renderVertexBuffers[\"noiseCoordinates2\"] = renderBuffer.createVertexBuffer(\"noiseCoordinates2\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n }\n renderVertexBuffers[\"angle\"] = renderBuffer.createVertexBuffer(\"angle\", offset, 1, this._attributesStrideSize, true);\n if (this._angularSpeedGradientsTexture) {\n offset++;\n } else {\n offset += 2;\n }\n if (this._isAnimationSheetEnabled) {\n renderVertexBuffers[\"cellIndex\"] = renderBuffer.createVertexBuffer(\"cellIndex\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n if (this.spriteRandomStartCell) {\n renderVertexBuffers[\"cellStartOffset\"] = renderBuffer.createVertexBuffer(\"cellStartOffset\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n }\n }\n renderVertexBuffers[\"offset\"] = spriteSource.createVertexBuffer(\"offset\", 0, 2);\n renderVertexBuffers[\"uv\"] = spriteSource.createVertexBuffer(\"uv\", 2, 2);\n this._renderVertexBuffers.push(renderVertexBuffers);\n this._platform.createVertexBuffers(updateBuffer, renderVertexBuffers);\n this.resetDrawCache();\n }\n _initialize(force = false) {\n if (this._buffer0 && !force) {\n return;\n }\n const engine = this._engine;\n const data = [];\n this._attributesStrideSize = 21;\n this._targetIndex = 0;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 1;\n }\n if (this.particleEmitterType instanceof CustomParticleEmitter) {\n this._attributesStrideSize += 3;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 1;\n }\n }\n if (!this.isBillboardBased) {\n this._attributesStrideSize += 3;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 1;\n }\n }\n if (this._colorGradientsTexture) {\n this._attributesStrideSize -= 4;\n }\n if (this._angularSpeedGradientsTexture) {\n this._attributesStrideSize -= 1;\n }\n if (this._isAnimationSheetEnabled) {\n this._attributesStrideSize += 1;\n if (this.spriteRandomStartCell) {\n this._attributesStrideSize += 1;\n }\n }\n if (this.noiseTexture) {\n this._attributesStrideSize += 6;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 2;\n }\n }\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 3 - (this._attributesStrideSize + 3 & 3); // round to multiple of 4\n }\n const usingCustomEmitter = this.particleEmitterType instanceof CustomParticleEmitter;\n const tmpVector = TmpVectors.Vector3[0];\n let offset = 0;\n for (let particleIndex = 0; particleIndex < this._capacity; particleIndex++) {\n // position\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n // Age\n data.push(0.0); // create the particle as a dead one to create a new one at start\n // Size\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n // life\n data.push(0.0);\n // Seed\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n // direction\n if (usingCustomEmitter) {\n this.particleEmitterType.particleDestinationGenerator(particleIndex, null, tmpVector);\n data.push(tmpVector.x);\n data.push(tmpVector.y);\n data.push(tmpVector.z);\n } else {\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n }\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy0\n }\n offset += 16; // position, age, size, life, seed, direction, dummy0\n if (usingCustomEmitter) {\n this.particleEmitterType.particlePositionGenerator(particleIndex, null, tmpVector);\n data.push(tmpVector.x);\n data.push(tmpVector.y);\n data.push(tmpVector.z);\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy1\n }\n offset += 4;\n }\n if (!this._colorGradientsTexture) {\n // color\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n offset += 4;\n }\n if (!this.isBillboardBased) {\n // initialDirection\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy2\n }\n offset += 4;\n }\n if (this.noiseTexture) {\n // Random coordinates for reading into noise texture\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy3\n }\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy4\n }\n offset += 8;\n }\n // angle\n data.push(0.0);\n offset += 1;\n if (!this._angularSpeedGradientsTexture) {\n data.push(0.0);\n offset += 1;\n }\n if (this._isAnimationSheetEnabled) {\n data.push(0.0);\n offset += 1;\n if (this.spriteRandomStartCell) {\n data.push(0.0);\n offset += 1;\n }\n }\n if (this._platform.alignDataInBuffer) {\n let numDummies = 3 - (offset + 3 & 3);\n offset += numDummies;\n while (numDummies-- > 0) {\n data.push(0.0);\n }\n }\n }\n // Sprite data\n const spriteData = new Float32Array([0.5, 0.5, 1, 1, -0.5, 0.5, 0, 1, 0.5, -0.5, 1, 0, -0.5, -0.5, 0, 0]);\n const bufferData1 = this._platform.createParticleBuffer(data);\n const bufferData2 = this._platform.createParticleBuffer(data);\n // Buffers\n this._buffer0 = new Buffer(engine, bufferData1, false, this._attributesStrideSize);\n this._buffer1 = new Buffer(engine, bufferData2, false, this._attributesStrideSize);\n this._spriteBuffer = new Buffer(engine, spriteData, false, 4);\n // Update & Render vertex buffers\n this._renderVertexBuffers = [];\n this._createVertexBuffers(this._buffer0, this._buffer1, this._spriteBuffer);\n this._createVertexBuffers(this._buffer1, this._buffer0, this._spriteBuffer);\n // Links\n this._sourceBuffer = this._buffer0;\n this._targetBuffer = this._buffer1;\n }\n /** @internal */\n _recreateUpdateEffect() {\n this._createColorGradientTexture();\n this._createSizeGradientTexture();\n this._createAngularSpeedGradientTexture();\n this._createVelocityGradientTexture();\n this._createLimitVelocityGradientTexture();\n this._createDragGradientTexture();\n let defines = this.particleEmitterType ? this.particleEmitterType.getEffectDefines() : \"\";\n if (this._isBillboardBased) {\n defines += \"\\n#define BILLBOARD\";\n }\n if (this._colorGradientsTexture) {\n defines += \"\\n#define COLORGRADIENTS\";\n }\n if (this._sizeGradientsTexture) {\n defines += \"\\n#define SIZEGRADIENTS\";\n }\n if (this._angularSpeedGradientsTexture) {\n defines += \"\\n#define ANGULARSPEEDGRADIENTS\";\n }\n if (this._velocityGradientsTexture) {\n defines += \"\\n#define VELOCITYGRADIENTS\";\n }\n if (this._limitVelocityGradientsTexture) {\n defines += \"\\n#define LIMITVELOCITYGRADIENTS\";\n }\n if (this._dragGradientsTexture) {\n defines += \"\\n#define DRAGGRADIENTS\";\n }\n if (this.isAnimationSheetEnabled) {\n defines += \"\\n#define ANIMATESHEET\";\n if (this.spriteRandomStartCell) {\n defines += \"\\n#define ANIMATESHEETRANDOMSTART\";\n }\n }\n if (this.noiseTexture) {\n defines += \"\\n#define NOISE\";\n }\n if (this.isLocal) {\n defines += \"\\n#define LOCAL\";\n }\n if (this._platform.isUpdateBufferCreated() && this._cachedUpdateDefines === defines) {\n return this._platform.isUpdateBufferReady();\n }\n this._cachedUpdateDefines = defines;\n this._updateBuffer = this._platform.createUpdateBuffer(defines);\n return this._platform.isUpdateBufferReady();\n }\n /**\n * @internal\n */\n _getWrapper(blendMode) {\n const customWrapper = this._getCustomDrawWrapper(blendMode);\n if (customWrapper !== null && customWrapper !== void 0 && customWrapper.effect) {\n return customWrapper;\n }\n const defines = [];\n this.fillDefines(defines, blendMode);\n // Effect\n let drawWrapper = this._drawWrappers[blendMode];\n if (!drawWrapper) {\n drawWrapper = new DrawWrapper(this._engine);\n if (drawWrapper.drawContext) {\n drawWrapper.drawContext.useInstancing = true;\n }\n this._drawWrappers[blendMode] = drawWrapper;\n }\n const join = defines.join(\"\\n\");\n if (drawWrapper.defines !== join) {\n const attributes = [];\n const uniforms = [];\n const samplers = [];\n this.fillUniformsAttributesAndSamplerNames(uniforms, attributes, samplers);\n drawWrapper.setEffect(this._engine.createEffect(\"gpuRenderParticles\", attributes, uniforms, samplers, join), join);\n }\n return drawWrapper;\n }\n /**\n * @internal\n */\n static _GetAttributeNamesOrOptions(hasColorGradients = false, isAnimationSheetEnabled = false, isBillboardBased = false, isBillboardStretched = false) {\n const attributeNamesOrOptions = [VertexBuffer.PositionKind, \"age\", \"life\", \"size\", \"angle\"];\n if (!hasColorGradients) {\n attributeNamesOrOptions.push(VertexBuffer.ColorKind);\n }\n if (isAnimationSheetEnabled) {\n attributeNamesOrOptions.push(\"cellIndex\");\n }\n if (!isBillboardBased) {\n attributeNamesOrOptions.push(\"initialDirection\");\n }\n if (isBillboardStretched) {\n attributeNamesOrOptions.push(\"direction\");\n }\n attributeNamesOrOptions.push(\"offset\", VertexBuffer.UVKind);\n return attributeNamesOrOptions;\n }\n /**\n * @internal\n */\n static _GetEffectCreationOptions(isAnimationSheetEnabled = false, useLogarithmicDepth = false, applyFog = false) {\n const effectCreationOption = [\"emitterWM\", \"worldOffset\", \"view\", \"projection\", \"colorDead\", \"invView\", \"translationPivot\", \"eyePosition\"];\n addClipPlaneUniforms(effectCreationOption);\n if (isAnimationSheetEnabled) {\n effectCreationOption.push(\"sheetInfos\");\n }\n if (useLogarithmicDepth) {\n effectCreationOption.push(\"logarithmicDepthConstant\");\n }\n if (applyFog) {\n effectCreationOption.push(\"vFogInfos\");\n effectCreationOption.push(\"vFogColor\");\n }\n return effectCreationOption;\n }\n /**\n * Fill the defines array according to the current settings of the particle system\n * @param defines Array to be updated\n * @param blendMode blend mode to take into account when updating the array\n * @param fillImageProcessing fills the image processing defines\n */\n fillDefines(defines, blendMode = 0, fillImageProcessing = true) {\n if (this._scene) {\n prepareStringDefinesForClipPlanes(this, this._scene, defines);\n if (this.applyFog && this._scene.fogEnabled && this._scene.fogMode !== Scene.FOGMODE_NONE) {\n defines.push(\"#define FOG\");\n }\n }\n if (blendMode === ParticleSystem.BLENDMODE_MULTIPLY) {\n defines.push(\"#define BLENDMULTIPLYMODE\");\n }\n if (this.isLocal) {\n defines.push(\"#define LOCAL\");\n }\n if (this.useLogarithmicDepth) {\n defines.push(\"#define LOGARITHMICDEPTH\");\n }\n if (this._isBillboardBased) {\n defines.push(\"#define BILLBOARD\");\n switch (this.billboardMode) {\n case ParticleSystem.BILLBOARDMODE_Y:\n defines.push(\"#define BILLBOARDY\");\n break;\n case ParticleSystem.BILLBOARDMODE_STRETCHED:\n defines.push(\"#define BILLBOARDSTRETCHED\");\n break;\n case ParticleSystem.BILLBOARDMODE_ALL:\n defines.push(\"#define BILLBOARDMODE_ALL\");\n break;\n default:\n break;\n }\n }\n if (this._colorGradientsTexture) {\n defines.push(\"#define COLORGRADIENTS\");\n }\n if (this.isAnimationSheetEnabled) {\n defines.push(\"#define ANIMATESHEET\");\n }\n if (fillImageProcessing && this._imageProcessingConfiguration) {\n this._imageProcessingConfiguration.prepareDefines(this._imageProcessingConfigurationDefines);\n defines.push(\"\" + this._imageProcessingConfigurationDefines.toString());\n }\n }\n /**\n * Fill the uniforms, attributes and samplers arrays according to the current settings of the particle system\n * @param uniforms Uniforms array to fill\n * @param attributes Attributes array to fill\n * @param samplers Samplers array to fill\n */\n fillUniformsAttributesAndSamplerNames(uniforms, attributes, samplers) {\n attributes.push(...GPUParticleSystem._GetAttributeNamesOrOptions(!!this._colorGradientsTexture, this._isAnimationSheetEnabled, this._isBillboardBased, this._isBillboardBased && this.billboardMode === ParticleSystem.BILLBOARDMODE_STRETCHED));\n uniforms.push(...GPUParticleSystem._GetEffectCreationOptions(this._isAnimationSheetEnabled, this.useLogarithmicDepth, this.applyFog));\n samplers.push(\"diffuseSampler\", \"colorGradientSampler\");\n if (this._imageProcessingConfiguration) {\n ImageProcessingConfiguration.PrepareUniforms(uniforms, this._imageProcessingConfigurationDefines);\n ImageProcessingConfiguration.PrepareSamplers(samplers, this._imageProcessingConfigurationDefines);\n }\n }\n /**\n * Animates the particle system for the current frame by emitting new particles and or animating the living ones.\n * @param preWarm defines if we are in the pre-warmimg phase\n */\n animate(preWarm = false) {\n var _this$_scene;\n this._timeDelta = this.updateSpeed * (preWarm ? this.preWarmStepOffset : ((_this$_scene = this._scene) === null || _this$_scene === void 0 ? void 0 : _this$_scene.getAnimationRatio()) || 1);\n this._actualFrame += this._timeDelta;\n if (!this._stopped) {\n if (this.targetStopDuration && this._actualFrame >= this.targetStopDuration) {\n this.stop();\n }\n }\n if (this.updateInAnimate) {\n this._update();\n }\n }\n _createFactorGradientTexture(factorGradients, textureName) {\n const texture = this[textureName];\n if (!factorGradients || !factorGradients.length || texture) {\n return;\n }\n const data = new Float32Array(this._rawTextureWidth);\n for (let x = 0; x < this._rawTextureWidth; x++) {\n const ratio = x / this._rawTextureWidth;\n GradientHelper.GetCurrentGradient(ratio, factorGradients, (currentGradient, nextGradient, scale) => {\n data[x] = Lerp(currentGradient.factor1, nextGradient.factor1, scale);\n });\n }\n this[textureName] = RawTexture.CreateRTexture(data, this._rawTextureWidth, 1, this._scene || this._engine, false, false, 1);\n this[textureName].name = textureName.substring(1);\n }\n _createSizeGradientTexture() {\n this._createFactorGradientTexture(this._sizeGradients, \"_sizeGradientsTexture\");\n }\n _createAngularSpeedGradientTexture() {\n this._createFactorGradientTexture(this._angularSpeedGradients, \"_angularSpeedGradientsTexture\");\n }\n _createVelocityGradientTexture() {\n this._createFactorGradientTexture(this._velocityGradients, \"_velocityGradientsTexture\");\n }\n _createLimitVelocityGradientTexture() {\n this._createFactorGradientTexture(this._limitVelocityGradients, \"_limitVelocityGradientsTexture\");\n }\n _createDragGradientTexture() {\n this._createFactorGradientTexture(this._dragGradients, \"_dragGradientsTexture\");\n }\n _createColorGradientTexture() {\n if (!this._colorGradients || !this._colorGradients.length || this._colorGradientsTexture) {\n return;\n }\n const data = new Uint8Array(this._rawTextureWidth * 4);\n const tmpColor = TmpColors.Color4[0];\n for (let x = 0; x < this._rawTextureWidth; x++) {\n const ratio = x / this._rawTextureWidth;\n GradientHelper.GetCurrentGradient(ratio, this._colorGradients, (currentGradient, nextGradient, scale) => {\n Color4.LerpToRef(currentGradient.color1, nextGradient.color1, scale, tmpColor);\n data[x * 4] = tmpColor.r * 255;\n data[x * 4 + 1] = tmpColor.g * 255;\n data[x * 4 + 2] = tmpColor.b * 255;\n data[x * 4 + 3] = tmpColor.a * 255;\n });\n }\n this._colorGradientsTexture = RawTexture.CreateRGBATexture(data, this._rawTextureWidth, 1, this._scene, false, false, 1);\n this._colorGradientsTexture.name = \"colorGradients\";\n }\n _render(blendMode, emitterWM) {\n var _this$_scene2, _this$defaultProjecti, _this$_scene3, _this$_scene4, _this$_scene5;\n // Enable render effect\n const drawWrapper = this._getWrapper(blendMode);\n const effect = drawWrapper.effect;\n this._engine.enableEffect(drawWrapper);\n const viewMatrix = ((_this$_scene2 = this._scene) === null || _this$_scene2 === void 0 ? void 0 : _this$_scene2.getViewMatrix()) || Matrix.IdentityReadOnly;\n effect.setMatrix(\"view\", viewMatrix);\n effect.setMatrix(\"projection\", (_this$defaultProjecti = this.defaultProjectionMatrix) !== null && _this$defaultProjecti !== void 0 ? _this$defaultProjecti : this._scene.getProjectionMatrix());\n effect.setTexture(\"diffuseSampler\", this.particleTexture);\n effect.setVector2(\"translationPivot\", this.translationPivot);\n effect.setVector3(\"worldOffset\", this.worldOffset);\n if (this.isLocal) {\n effect.setMatrix(\"emitterWM\", emitterWM);\n }\n if (this._colorGradientsTexture) {\n effect.setTexture(\"colorGradientSampler\", this._colorGradientsTexture);\n } else {\n effect.setDirectColor4(\"colorDead\", this.colorDead);\n }\n if (this._isAnimationSheetEnabled && this.particleTexture) {\n const baseSize = this.particleTexture.getBaseSize();\n effect.setFloat3(\"sheetInfos\", this.spriteCellWidth / baseSize.width, this.spriteCellHeight / baseSize.height, baseSize.width / this.spriteCellWidth);\n }\n if (this._isBillboardBased && this._scene) {\n const camera = this._scene.activeCamera;\n effect.setVector3(\"eyePosition\", camera.globalPosition);\n }\n const defines = effect.defines;\n if (this._scene) {\n bindClipPlane(effect, this, this._scene);\n if (this.applyFog) {\n BindFogParameters(this._scene, undefined, effect);\n }\n }\n if (defines.indexOf(\"#define BILLBOARDMODE_ALL\") >= 0) {\n const invView = viewMatrix.clone();\n invView.invert();\n effect.setMatrix(\"invView\", invView);\n }\n // Log. depth\n if (this.useLogarithmicDepth && this._scene) {\n BindLogDepth(defines, effect, this._scene);\n }\n // image processing\n if (this._imageProcessingConfiguration && !this._imageProcessingConfiguration.applyByPostProcess) {\n this._imageProcessingConfiguration.bind(effect);\n }\n // Draw order\n switch (blendMode) {\n case ParticleSystem.BLENDMODE_ADD:\n this._engine.setAlphaMode(1);\n break;\n case ParticleSystem.BLENDMODE_ONEONE:\n this._engine.setAlphaMode(6);\n break;\n case ParticleSystem.BLENDMODE_STANDARD:\n this._engine.setAlphaMode(2);\n break;\n case ParticleSystem.BLENDMODE_MULTIPLY:\n this._engine.setAlphaMode(4);\n break;\n }\n // Bind source VAO\n this._platform.bindDrawBuffers(this._targetIndex, effect, (_this$_scene3 = this._scene) !== null && _this$_scene3 !== void 0 && _this$_scene3.forceWireframe ? this._linesIndexBufferUseInstancing : null);\n if (this._onBeforeDrawParticlesObservable) {\n this._onBeforeDrawParticlesObservable.notifyObservers(effect);\n }\n // Render\n if ((_this$_scene4 = this._scene) !== null && _this$_scene4 !== void 0 && _this$_scene4.forceWireframe) {\n this._engine.drawElementsType(6, 0, 10, this._currentActiveCount);\n } else {\n this._engine.drawArraysType(7, 0, 4, this._currentActiveCount);\n }\n this._engine.setAlphaMode(0);\n if ((_this$_scene5 = this._scene) !== null && _this$_scene5 !== void 0 && _this$_scene5.forceWireframe) {\n this._engine.unbindInstanceAttributes();\n }\n return this._currentActiveCount;\n }\n /** @internal */\n _update(emitterWM) {\n if (!this.emitter || !this._targetBuffer) {\n return;\n }\n if (!this._recreateUpdateEffect() || this._rebuildingAfterContextLost) {\n return;\n }\n if (!emitterWM) {\n if (this.emitter.position) {\n const emitterMesh = this.emitter;\n emitterWM = emitterMesh.getWorldMatrix();\n } else {\n const emitterPosition = this.emitter;\n emitterWM = TmpVectors.Matrix[0];\n Matrix.TranslationToRef(emitterPosition.x, emitterPosition.y, emitterPosition.z, emitterWM);\n }\n }\n this._platform.preUpdateParticleBuffer();\n this._updateBuffer.setFloat(\"currentCount\", this._currentActiveCount);\n this._updateBuffer.setFloat(\"timeDelta\", this._timeDelta);\n this._updateBuffer.setFloat(\"stopFactor\", this._stopped ? 0 : 1);\n this._updateBuffer.setInt(\"randomTextureSize\", this._randomTextureSize);\n this._updateBuffer.setFloat2(\"lifeTime\", this.minLifeTime, this.maxLifeTime);\n this._updateBuffer.setFloat2(\"emitPower\", this.minEmitPower, this.maxEmitPower);\n if (!this._colorGradientsTexture) {\n this._updateBuffer.setDirectColor4(\"color1\", this.color1);\n this._updateBuffer.setDirectColor4(\"color2\", this.color2);\n }\n this._updateBuffer.setFloat2(\"sizeRange\", this.minSize, this.maxSize);\n this._updateBuffer.setFloat4(\"scaleRange\", this.minScaleX, this.maxScaleX, this.minScaleY, this.maxScaleY);\n this._updateBuffer.setFloat4(\"angleRange\", this.minAngularSpeed, this.maxAngularSpeed, this.minInitialRotation, this.maxInitialRotation);\n this._updateBuffer.setVector3(\"gravity\", this.gravity);\n if (this._limitVelocityGradientsTexture) {\n this._updateBuffer.setFloat(\"limitVelocityDamping\", this.limitVelocityDamping);\n }\n if (this.particleEmitterType) {\n this.particleEmitterType.applyToShader(this._updateBuffer);\n }\n if (this._isAnimationSheetEnabled) {\n this._updateBuffer.setFloat4(\"cellInfos\", this.startSpriteCellID, this.endSpriteCellID, this.spriteCellChangeSpeed, this.spriteCellLoop ? 1 : 0);\n }\n if (this.noiseTexture) {\n this._updateBuffer.setVector3(\"noiseStrength\", this.noiseStrength);\n }\n if (!this.isLocal) {\n this._updateBuffer.setMatrix(\"emitterWM\", emitterWM);\n }\n this._platform.updateParticleBuffer(this._targetIndex, this._targetBuffer, this._currentActiveCount);\n // Switch VAOs\n this._targetIndex++;\n if (this._targetIndex === 2) {\n this._targetIndex = 0;\n }\n // Switch buffers\n const tmpBuffer = this._sourceBuffer;\n this._sourceBuffer = this._targetBuffer;\n this._targetBuffer = tmpBuffer;\n }\n /**\n * Renders the particle system in its current state\n * @param preWarm defines if the system should only update the particles but not render them\n * @param forceUpdateOnly if true, force to only update the particles and never display them (meaning, even if preWarm=false, when forceUpdateOnly=true the particles won't be displayed)\n * @returns the current number of particles\n */\n render(preWarm = false, forceUpdateOnly = false) {\n if (!this._started) {\n return 0;\n }\n if (!this.isReady()) {\n return 0;\n }\n if (!preWarm && this._scene) {\n if (!this._preWarmDone && this.preWarmCycles) {\n for (let index = 0; index < this.preWarmCycles; index++) {\n this.animate(true);\n this.render(true, true);\n }\n this._preWarmDone = true;\n }\n if (this._currentRenderId === this._scene.getRenderId() && (!this._scene.activeCamera || this._scene.activeCamera && this._currentRenderingCameraUniqueId === this._scene.activeCamera.uniqueId)) {\n return 0;\n }\n this._currentRenderId = this._scene.getRenderId();\n if (this._scene.activeCamera) {\n this._currentRenderingCameraUniqueId = this._scene.activeCamera.uniqueId;\n }\n }\n // Get everything ready to render\n this._initialize();\n this._accumulatedCount += this.emitRate * this._timeDelta;\n if (this._accumulatedCount > 1) {\n const intPart = this._accumulatedCount | 0;\n this._accumulatedCount -= intPart;\n this._currentActiveCount += intPart;\n }\n this._currentActiveCount = Math.min(this._maxActiveParticleCount, this._currentActiveCount);\n if (!this._currentActiveCount) {\n return 0;\n }\n // Enable update effect\n let emitterWM;\n if (this.emitter.position) {\n const emitterMesh = this.emitter;\n emitterWM = emitterMesh.getWorldMatrix();\n } else {\n const emitterPosition = this.emitter;\n emitterWM = TmpVectors.Matrix[0];\n Matrix.TranslationToRef(emitterPosition.x, emitterPosition.y, emitterPosition.z, emitterWM);\n }\n const engine = this._engine;\n if (!this.updateInAnimate) {\n this._update(emitterWM);\n }\n let outparticles = 0;\n if (!preWarm && !forceUpdateOnly) {\n engine.setState(false);\n if (this.forceDepthWrite) {\n engine.setDepthWrite(true);\n }\n if (this.blendMode === ParticleSystem.BLENDMODE_MULTIPLYADD) {\n outparticles = this._render(ParticleSystem.BLENDMODE_MULTIPLY, emitterWM) + this._render(ParticleSystem.BLENDMODE_ADD, emitterWM);\n } else {\n outparticles = this._render(this.blendMode, emitterWM);\n }\n this._engine.setAlphaMode(0);\n }\n return outparticles;\n }\n /**\n * Rebuilds the particle system\n */\n rebuild() {\n const checkUpdateEffect = () => {\n if (!this._recreateUpdateEffect() || !this._platform.isUpdateBufferReady()) {\n setTimeout(checkUpdateEffect, 10);\n } else {\n this._initialize(true);\n this._rebuildingAfterContextLost = false;\n }\n };\n this._createIndexBuffer();\n this._cachedUpdateDefines = \"\";\n this._platform.contextLost();\n this._rebuildingAfterContextLost = true;\n checkUpdateEffect();\n }\n _releaseBuffers() {\n if (this._buffer0) {\n this._buffer0.dispose();\n this._buffer0 = null;\n }\n if (this._buffer1) {\n this._buffer1.dispose();\n this._buffer1 = null;\n }\n if (this._spriteBuffer) {\n this._spriteBuffer.dispose();\n this._spriteBuffer = null;\n }\n this._platform.releaseBuffers();\n }\n /**\n * Disposes the particle system and free the associated resources\n * @param disposeTexture defines if the particule texture must be disposed as well (true by default)\n */\n dispose(disposeTexture = true) {\n for (const blendMode in this._drawWrappers) {\n const drawWrapper = this._drawWrappers[blendMode];\n drawWrapper.dispose();\n }\n this._drawWrappers = {};\n if (this._scene) {\n const index = this._scene.particleSystems.indexOf(this);\n if (index > -1) {\n this._scene.particleSystems.splice(index, 1);\n }\n }\n this._releaseBuffers();\n this._platform.releaseVertexBuffers();\n for (let i = 0; i < this._renderVertexBuffers.length; ++i) {\n const rvb = this._renderVertexBuffers[i];\n for (const key in rvb) {\n rvb[key].dispose();\n }\n }\n this._renderVertexBuffers = [];\n if (this._colorGradientsTexture) {\n this._colorGradientsTexture.dispose();\n this._colorGradientsTexture = null;\n }\n if (this._sizeGradientsTexture) {\n this._sizeGradientsTexture.dispose();\n this._sizeGradientsTexture = null;\n }\n if (this._angularSpeedGradientsTexture) {\n this._angularSpeedGradientsTexture.dispose();\n this._angularSpeedGradientsTexture = null;\n }\n if (this._velocityGradientsTexture) {\n this._velocityGradientsTexture.dispose();\n this._velocityGradientsTexture = null;\n }\n if (this._limitVelocityGradientsTexture) {\n this._limitVelocityGradientsTexture.dispose();\n this._limitVelocityGradientsTexture = null;\n }\n if (this._dragGradientsTexture) {\n this._dragGradientsTexture.dispose();\n this._dragGradientsTexture = null;\n }\n if (this._randomTexture) {\n this._randomTexture.dispose();\n this._randomTexture = null;\n }\n if (this._randomTexture2) {\n this._randomTexture2.dispose();\n this._randomTexture2 = null;\n }\n if (disposeTexture && this.particleTexture) {\n this.particleTexture.dispose();\n this.particleTexture = null;\n }\n if (disposeTexture && this.noiseTexture) {\n this.noiseTexture.dispose();\n this.noiseTexture = null;\n }\n // Callback\n this.onStoppedObservable.clear();\n this.onDisposeObservable.notifyObservers(this);\n this.onDisposeObservable.clear();\n }\n /**\n * Clones the particle system.\n * @param name The name of the cloned object\n * @param newEmitter The new emitter to use\n * @param cloneTexture Also clone the textures if true\n * @returns the cloned particle system\n */\n clone(name, newEmitter, cloneTexture = false) {\n const custom = {\n ...this._customWrappers\n };\n let program = null;\n const engine = this._engine;\n if (engine.createEffectForParticles) {\n if (this.customShader != null) {\n program = this.customShader;\n const defines = program.shaderOptions.defines.length > 0 ? program.shaderOptions.defines.join(\"\\n\") : \"\";\n custom[0] = engine.createEffectForParticles(program.shaderPath.fragmentElement, program.shaderOptions.uniforms, program.shaderOptions.samplers, defines, undefined, undefined, undefined, this);\n }\n }\n const serialization = this.serialize(cloneTexture);\n const result = GPUParticleSystem.Parse(serialization, this._scene || this._engine, this._rootUrl);\n result.name = name;\n result.customShader = program;\n result._customWrappers = custom;\n if (newEmitter === undefined) {\n newEmitter = this.emitter;\n }\n if (this.noiseTexture) {\n result.noiseTexture = this.noiseTexture.clone();\n }\n result.emitter = newEmitter;\n return result;\n }\n /**\n * Serializes the particle system to a JSON object\n * @param serializeTexture defines if the texture must be serialized as well\n * @returns the JSON object\n */\n serialize(serializeTexture = false) {\n const serializationObject = {};\n ParticleSystem._Serialize(serializationObject, this, serializeTexture);\n serializationObject.activeParticleCount = this.activeParticleCount;\n serializationObject.randomTextureSize = this._randomTextureSize;\n serializationObject.customShader = this.customShader;\n return serializationObject;\n }\n /**\n * Parses a JSON object to create a GPU particle system.\n * @param parsedParticleSystem The JSON object to parse\n * @param sceneOrEngine The scene or the engine to create the particle system in\n * @param rootUrl The root url to use to load external dependencies like texture\n * @param doNotStart Ignore the preventAutoStart attribute and does not start\n * @param capacity defines the system capacity (if null or undefined the sotred capacity will be used)\n * @returns the parsed GPU particle system\n */\n static Parse(parsedParticleSystem, sceneOrEngine, rootUrl, doNotStart = false, capacity) {\n const name = parsedParticleSystem.name;\n let engine;\n let scene;\n if (sceneOrEngine instanceof AbstractEngine) {\n engine = sceneOrEngine;\n } else {\n scene = sceneOrEngine;\n engine = scene.getEngine();\n }\n const particleSystem = new GPUParticleSystem(name, {\n capacity: capacity || parsedParticleSystem.capacity,\n randomTextureSize: parsedParticleSystem.randomTextureSize\n }, sceneOrEngine, null, parsedParticleSystem.isAnimationSheetEnabled);\n particleSystem._rootUrl = rootUrl;\n if (parsedParticleSystem.customShader && engine.createEffectForParticles) {\n const program = parsedParticleSystem.customShader;\n const defines = program.shaderOptions.defines.length > 0 ? program.shaderOptions.defines.join(\"\\n\") : \"\";\n const custom = engine.createEffectForParticles(program.shaderPath.fragmentElement, program.shaderOptions.uniforms, program.shaderOptions.samplers, defines, undefined, undefined, undefined, particleSystem);\n particleSystem.setCustomEffect(custom, 0);\n particleSystem.customShader = program;\n }\n if (parsedParticleSystem.id) {\n particleSystem.id = parsedParticleSystem.id;\n }\n if (parsedParticleSystem.activeParticleCount) {\n particleSystem.activeParticleCount = parsedParticleSystem.activeParticleCount;\n }\n ParticleSystem._Parse(parsedParticleSystem, particleSystem, sceneOrEngine, rootUrl);\n // Auto start\n if (parsedParticleSystem.preventAutoStart) {\n particleSystem.preventAutoStart = parsedParticleSystem.preventAutoStart;\n }\n if (!doNotStart && !particleSystem.preventAutoStart) {\n particleSystem.start();\n }\n return particleSystem;\n 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{ FactorGradient, ColorGradient, GradientHelper } from \"../Misc/gradients.js\";\nimport { Observable } from \"../Misc/observable.js\";\nimport { Vector3, Matrix, TmpVectors } from \"../Maths/math.vector.js\";\nimport { Color4, TmpColors } from \"../Maths/math.color.js\";\nimport { Lerp } from \"../Maths/math.scalar.functions.js\";\nimport { VertexBuffer, Buffer } from \"../Buffers/buffer.js\";\nimport { BaseParticleSystem } from \"./baseParticleSystem.js\";\nimport { ParticleSystem } from \"./particleSystem.js\";\nimport { BoxParticleEmitter } from \"../Particles/EmitterTypes/boxParticleEmitter.js\";\nimport { ImageProcessingConfiguration } from \"../Materials/imageProcessingConfiguration.js\";\nimport { RawTexture } from \"../Materials/Textures/rawTexture.js\";\n\nimport { EngineStore } from \"../Engines/engineStore.js\";\nimport { CustomParticleEmitter } from \"./EmitterTypes/customParticleEmitter.js\";\nimport { AbstractEngine } from \"../Engines/abstractEngine.js\";\nimport { DrawWrapper } from \"../Materials/drawWrapper.js\";\nimport { GetClass } from \"../Misc/typeStore.js\";\nimport { addClipPlaneUniforms, bindClipPlane, prepareStringDefinesForClipPlanes } from \"../Materials/clipPlaneMaterialHelper.js\";\nimport { Scene } from \"../scene.js\";\nimport \"../Engines/Extensions/engine.transformFeedback.js\";\nimport \"../Shaders/gpuRenderParticles.fragment.js\";\nimport \"../Shaders/gpuRenderParticles.vertex.js\";\nimport { BindFogParameters, BindLogDepth } from \"../Materials/materialHelper.functions.js\";\nimport { CreateConeEmitter, CreateCylinderEmitter, CreateDirectedCylinderEmitter, CreateDirectedSphereEmitter, CreateDirectedConeEmitter, CreateHemisphericEmitter, CreatePointEmitter, CreateSphereEmitter, } from \"./particleSystem.functions.js\";\n/**\n * This represents a GPU particle system in Babylon\n * This is the fastest particle system in Babylon as it uses the GPU to update the individual particle data\n * @see https://www.babylonjs-playground.com/#PU4WYI#4\n */\nexport class GPUParticleSystem extends BaseParticleSystem {\n /**\n * Gets a boolean indicating if the GPU particles can be rendered on current browser\n */\n static get IsSupported() {\n if (!EngineStore.LastCreatedEngine) {\n return false;\n }\n const caps = EngineStore.LastCreatedEngine.getCaps();\n return caps.supportTransformFeedbacks || caps.supportComputeShaders;\n }\n _createIndexBuffer() {\n this._linesIndexBufferUseInstancing = this._engine.createIndexBuffer(new Uint32Array([0, 1, 1, 3, 3, 2, 2, 0, 0, 3]), undefined, \"GPUParticleSystemLinesIndexBuffer\");\n }\n /**\n * Gets the maximum number of particles active at the same time.\n * @returns The max number of active particles.\n */\n getCapacity() {\n return this._capacity;\n }\n /**\n * Gets or set the number of active particles\n * The value cannot be greater than \"capacity\" (if it is, it will be limited to \"capacity\").\n */\n get maxActiveParticleCount() {\n return this._maxActiveParticleCount;\n }\n set maxActiveParticleCount(value) {\n this._maxActiveParticleCount = Math.min(value, this._capacity);\n }\n /**\n * Gets or set the number of active particles\n * @deprecated Please use maxActiveParticleCount instead.\n */\n get activeParticleCount() {\n return this.maxActiveParticleCount;\n }\n set activeParticleCount(value) {\n this.maxActiveParticleCount = value;\n }\n /**\n * Creates a Point Emitter for the particle system (emits directly from the emitter position)\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the box\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the box\n * @returns the emitter\n */\n createPointEmitter(direction1, direction2) {\n const particleEmitter = CreatePointEmitter(direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Hemisphere Emitter for the particle system (emits along the hemisphere radius)\n * @param radius The radius of the hemisphere to emit from\n * @param radiusRange The range of the hemisphere to emit from [0-1] 0 Surface Only, 1 Entire Radius\n * @returns the emitter\n */\n createHemisphericEmitter(radius = 1, radiusRange = 1) {\n const particleEmitter = CreateHemisphericEmitter(radius, radiusRange);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Sphere Emitter for the particle system (emits along the sphere radius)\n * @param radius The radius of the sphere to emit from\n * @param radiusRange The range of the sphere to emit from [0-1] 0 Surface Only, 1 Entire Radius\n * @returns the emitter\n */\n createSphereEmitter(radius = 1, radiusRange = 1) {\n const particleEmitter = CreateSphereEmitter(radius, radiusRange);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Directed Sphere Emitter for the particle system (emits between direction1 and direction2)\n * @param radius The radius of the sphere to emit from\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the sphere\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the sphere\n * @returns the emitter\n */\n createDirectedSphereEmitter(radius = 1, direction1 = new Vector3(0, 1.0, 0), direction2 = new Vector3(0, 1.0, 0)) {\n const particleEmitter = CreateDirectedSphereEmitter(radius, direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Cylinder Emitter for the particle system (emits from the cylinder to the particle position)\n * @param radius The radius of the emission cylinder\n * @param height The height of the emission cylinder\n * @param radiusRange The range of emission [0-1] 0 Surface only, 1 Entire Radius\n * @param directionRandomizer How much to randomize the particle direction [0-1]\n * @returns the emitter\n */\n createCylinderEmitter(radius = 1, height = 1, radiusRange = 1, directionRandomizer = 0) {\n const particleEmitter = CreateCylinderEmitter(radius, height, radiusRange, directionRandomizer);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Directed Cylinder Emitter for the particle system (emits between direction1 and direction2)\n * @param radius The radius of the cylinder to emit from\n * @param height The height of the emission cylinder\n * @param radiusRange the range of the emission cylinder [0-1] 0 Surface only, 1 Entire Radius (1 by default)\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the cylinder\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the cylinder\n * @returns the emitter\n */\n createDirectedCylinderEmitter(radius = 1, height = 1, radiusRange = 1, direction1 = new Vector3(0, 1.0, 0), direction2 = new Vector3(0, 1.0, 0)) {\n const particleEmitter = CreateDirectedCylinderEmitter(radius, height, radiusRange, direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Cone Emitter for the particle system (emits from the cone to the particle position)\n * @param radius The radius of the cone to emit from\n * @param angle The base angle of the cone\n * @returns the emitter\n */\n createConeEmitter(radius = 1, angle = Math.PI / 4) {\n const particleEmitter = CreateConeEmitter(radius, angle);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n createDirectedConeEmitter(radius = 1, angle = Math.PI / 4, direction1 = new Vector3(0, 1.0, 0), direction2 = new Vector3(0, 1.0, 0)) {\n const particleEmitter = CreateDirectedConeEmitter(radius, angle, direction1, direction2);\n this.particleEmitterType = particleEmitter;\n return particleEmitter;\n }\n /**\n * Creates a Box Emitter for the particle system. (emits between direction1 and direction2 from withing the box defined by minEmitBox and maxEmitBox)\n * @param direction1 Particles are emitted between the direction1 and direction2 from within the box\n * @param direction2 Particles are emitted between the direction1 and direction2 from within the box\n * @param minEmitBox Particles are emitted from the box between minEmitBox and maxEmitBox\n * @param maxEmitBox Particles are emitted from the box between minEmitBox and maxEmitBox\n * @returns the emitter\n */\n createBoxEmitter(direction1, direction2, minEmitBox, maxEmitBox) {\n const particleEmitter = new BoxParticleEmitter();\n this.particleEmitterType = particleEmitter;\n this.direction1 = direction1;\n this.direction2 = direction2;\n this.minEmitBox = minEmitBox;\n this.maxEmitBox = maxEmitBox;\n return particleEmitter;\n }\n /**\n * Is this system ready to be used/rendered\n * @returns true if the system is ready\n */\n isReady() {\n if (!this.emitter ||\n (this._imageProcessingConfiguration && !this._imageProcessingConfiguration.isReady()) ||\n !this.particleTexture ||\n !this.particleTexture.isReady() ||\n this._rebuildingAfterContextLost) {\n return false;\n }\n if (this.blendMode !== ParticleSystem.BLENDMODE_MULTIPLYADD) {\n if (!this._getWrapper(this.blendMode).effect.isReady()) {\n return false;\n }\n }\n else {\n if (!this._getWrapper(ParticleSystem.BLENDMODE_MULTIPLY).effect.isReady()) {\n return false;\n }\n if (!this._getWrapper(ParticleSystem.BLENDMODE_ADD).effect.isReady()) {\n return false;\n }\n }\n if (!this._platform.isUpdateBufferCreated()) {\n this._recreateUpdateEffect();\n return false;\n }\n return this._platform.isUpdateBufferReady();\n }\n /**\n * Gets if the system has been started. (Note: this will still be true after stop is called)\n * @returns True if it has been started, otherwise false.\n */\n isStarted() {\n return this._started;\n }\n /**\n * Gets if the system has been stopped. (Note: rendering is still happening but the system is frozen)\n * @returns True if it has been stopped, otherwise false.\n */\n isStopped() {\n return this._stopped;\n }\n /**\n * Gets a boolean indicating that the system is stopping\n * @returns true if the system is currently stopping\n */\n isStopping() {\n return false; // Stop is immediate on GPU\n }\n /**\n * Gets the number of particles active at the same time.\n * @returns The number of active particles.\n */\n getActiveCount() {\n return this._currentActiveCount;\n }\n /**\n * Starts the particle system and begins to emit\n * @param delay defines the delay in milliseconds before starting the system (this.startDelay by default)\n */\n start(delay = this.startDelay) {\n if (!this.targetStopDuration && this._hasTargetStopDurationDependantGradient()) {\n // eslint-disable-next-line no-throw-literal\n throw \"Particle system started with a targetStopDuration dependant gradient (eg. startSizeGradients) but no targetStopDuration set\";\n }\n if (delay) {\n setTimeout(() => {\n this.start(0);\n }, delay);\n return;\n }\n this._started = true;\n this._stopped = false;\n this._preWarmDone = false;\n // Animations\n if (this.beginAnimationOnStart && this.animations && this.animations.length > 0 && this._scene) {\n this._scene.beginAnimation(this, this.beginAnimationFrom, this.beginAnimationTo, this.beginAnimationLoop);\n }\n }\n /**\n * Stops the particle system.\n */\n stop() {\n if (this._stopped) {\n return;\n }\n this.onStoppedObservable.notifyObservers(this);\n this._stopped = true;\n }\n /**\n * Remove all active particles\n */\n reset() {\n this._releaseBuffers();\n this._platform.releaseVertexBuffers();\n this._currentActiveCount = 0;\n this._targetIndex = 0;\n }\n /**\n * Returns the string \"GPUParticleSystem\"\n * @returns a string containing the class name\n */\n getClassName() {\n return \"GPUParticleSystem\";\n }\n /**\n * Gets the custom effect used to render the particles\n * @param blendMode Blend mode for which the effect should be retrieved\n * @returns The effect\n */\n getCustomEffect(blendMode = 0) {\n return this._customWrappers[blendMode]?.effect ?? this._customWrappers[0].effect;\n }\n _getCustomDrawWrapper(blendMode = 0) {\n return this._customWrappers[blendMode] ?? this._customWrappers[0];\n }\n /**\n * Sets the custom effect used to render the particles\n * @param effect The effect to set\n * @param blendMode Blend mode for which the effect should be set\n */\n setCustomEffect(effect, blendMode = 0) {\n this._customWrappers[blendMode] = new DrawWrapper(this._engine);\n this._customWrappers[blendMode].effect = effect;\n }\n /**\n * Observable that will be called just before the particles are drawn\n */\n get onBeforeDrawParticlesObservable() {\n if (!this._onBeforeDrawParticlesObservable) {\n this._onBeforeDrawParticlesObservable = new Observable();\n }\n return this._onBeforeDrawParticlesObservable;\n }\n /**\n * Gets the name of the particle vertex shader\n */\n get vertexShaderName() {\n return \"gpuRenderParticles\";\n }\n /**\n * Gets the vertex buffers used by the particle system\n * Should be called after render() has been called for the current frame so that the buffers returned are the ones that have been updated\n * in the current frame (there's a ping-pong between two sets of buffers - for a given frame, one set is used as the source and the other as the destination)\n */\n get vertexBuffers() {\n // We return the other buffers than those corresponding to this._targetIndex because it is assumed vertexBuffers will be called in the current frame\n // after render() has been called, meaning that the buffers have already been swapped and this._targetIndex points to the buffers that will be updated\n // in the next frame (and which are the sources in this frame) and (this._targetIndex ^ 1) points to the buffers that have been updated this frame\n // (and that will be the source buffers in the next frame)\n return this._renderVertexBuffers[this._targetIndex ^ 1];\n }\n /**\n * Gets the index buffer used by the particle system (null for GPU particle systems)\n */\n get indexBuffer() {\n return null;\n }\n _removeGradientAndTexture(gradient, gradients, texture) {\n super._removeGradientAndTexture(gradient, gradients, texture);\n this._releaseBuffers();\n return this;\n }\n /**\n * Adds a new color gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param color1 defines the color to affect to the specified gradient\n * @returns the current particle system\n */\n addColorGradient(gradient, color1) {\n if (!this._colorGradients) {\n this._colorGradients = [];\n }\n const colorGradient = new ColorGradient(gradient, color1);\n this._colorGradients.push(colorGradient);\n this._refreshColorGradient(true);\n this._releaseBuffers();\n return this;\n }\n _refreshColorGradient(reorder = false) {\n if (this._colorGradients) {\n if (reorder) {\n this._colorGradients.sort((a, b) => {\n if (a.gradient < b.gradient) {\n return -1;\n }\n else if (a.gradient > b.gradient) {\n return 1;\n }\n return 0;\n });\n }\n if (this._colorGradientsTexture) {\n this._colorGradientsTexture.dispose();\n this._colorGradientsTexture = null;\n }\n }\n }\n /** Force the system to rebuild all gradients that need to be resync */\n forceRefreshGradients() {\n this._refreshColorGradient();\n this._refreshFactorGradient(this._sizeGradients, \"_sizeGradientsTexture\");\n this._refreshFactorGradient(this._angularSpeedGradients, \"_angularSpeedGradientsTexture\");\n this._refreshFactorGradient(this._velocityGradients, \"_velocityGradientsTexture\");\n this._refreshFactorGradient(this._limitVelocityGradients, \"_limitVelocityGradientsTexture\");\n this._refreshFactorGradient(this._dragGradients, \"_dragGradientsTexture\");\n this.reset();\n }\n /**\n * Remove a specific color gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeColorGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._colorGradients, this._colorGradientsTexture);\n this._colorGradientsTexture = null;\n return this;\n }\n /**\n * Resets the draw wrappers cache\n */\n resetDrawCache() {\n for (const blendMode in this._drawWrappers) {\n const drawWrapper = this._drawWrappers[blendMode];\n drawWrapper.drawContext?.reset();\n }\n }\n _addFactorGradient(factorGradients, gradient, factor) {\n const valueGradient = new FactorGradient(gradient, factor);\n factorGradients.push(valueGradient);\n this._releaseBuffers();\n }\n /**\n * Adds a new size gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the size factor to affect to the specified gradient\n * @returns the current particle system\n */\n addSizeGradient(gradient, factor) {\n if (!this._sizeGradients) {\n this._sizeGradients = [];\n }\n this._addFactorGradient(this._sizeGradients, gradient, factor);\n this._refreshFactorGradient(this._sizeGradients, \"_sizeGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific size gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeSizeGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._sizeGradients, this._sizeGradientsTexture);\n this._sizeGradientsTexture = null;\n return this;\n }\n _refreshFactorGradient(factorGradients, textureName, reorder = false) {\n if (!factorGradients) {\n return;\n }\n if (reorder) {\n factorGradients.sort((a, b) => {\n if (a.gradient < b.gradient) {\n return -1;\n }\n else if (a.gradient > b.gradient) {\n return 1;\n }\n return 0;\n });\n }\n const that = this;\n if (that[textureName]) {\n that[textureName].dispose();\n that[textureName] = null;\n }\n }\n /**\n * Adds a new angular speed gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the angular speed to affect to the specified gradient\n * @returns the current particle system\n */\n addAngularSpeedGradient(gradient, factor) {\n if (!this._angularSpeedGradients) {\n this._angularSpeedGradients = [];\n }\n this._addFactorGradient(this._angularSpeedGradients, gradient, factor);\n this._refreshFactorGradient(this._angularSpeedGradients, \"_angularSpeedGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific angular speed gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeAngularSpeedGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._angularSpeedGradients, this._angularSpeedGradientsTexture);\n this._angularSpeedGradientsTexture = null;\n return this;\n }\n /**\n * Adds a new velocity gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the velocity to affect to the specified gradient\n * @returns the current particle system\n */\n addVelocityGradient(gradient, factor) {\n if (!this._velocityGradients) {\n this._velocityGradients = [];\n }\n this._addFactorGradient(this._velocityGradients, gradient, factor);\n this._refreshFactorGradient(this._velocityGradients, \"_velocityGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific velocity gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeVelocityGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._velocityGradients, this._velocityGradientsTexture);\n this._velocityGradientsTexture = null;\n return this;\n }\n /**\n * Adds a new limit velocity gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the limit velocity value to affect to the specified gradient\n * @returns the current particle system\n */\n addLimitVelocityGradient(gradient, factor) {\n if (!this._limitVelocityGradients) {\n this._limitVelocityGradients = [];\n }\n this._addFactorGradient(this._limitVelocityGradients, gradient, factor);\n this._refreshFactorGradient(this._limitVelocityGradients, \"_limitVelocityGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific limit velocity gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeLimitVelocityGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._limitVelocityGradients, this._limitVelocityGradientsTexture);\n this._limitVelocityGradientsTexture = null;\n return this;\n }\n /**\n * Adds a new drag gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the drag value to affect to the specified gradient\n * @returns the current particle system\n */\n addDragGradient(gradient, factor) {\n if (!this._dragGradients) {\n this._dragGradients = [];\n }\n this._addFactorGradient(this._dragGradients, gradient, factor);\n this._refreshFactorGradient(this._dragGradients, \"_dragGradientsTexture\", true);\n this._releaseBuffers();\n return this;\n }\n /**\n * Remove a specific drag gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeDragGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._dragGradients, this._dragGradientsTexture);\n this._dragGradientsTexture = null;\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addEmitRateGradient() {\n // Do nothing as emit rate is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeEmitRateGradient() {\n // Do nothing as emit rate is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addStartSizeGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeStartSizeGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addColorRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeColorRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addAlphaRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeAlphaRemapGradient() {\n // Do nothing as start size is not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addRampGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeRampGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the list of ramp gradients\n */\n getRampGradients() {\n return null;\n }\n /**\n * Not supported by GPUParticleSystem\n * Gets or sets a boolean indicating that ramp gradients must be used\n * @see https://doc.babylonjs.com/features/featuresDeepDive/particles/particle_system/particle_system_intro#ramp-gradients\n */\n get useRampGradients() {\n //Not supported by GPUParticleSystem\n return false;\n }\n set useRampGradients(value) {\n //Not supported by GPUParticleSystem\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n addLifeTimeGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Not supported by GPUParticleSystem\n * @returns the current particle system\n */\n removeLifeTimeGradient() {\n //Not supported by GPUParticleSystem\n return this;\n }\n /**\n * Instantiates a GPU particle system.\n * Particles are often small sprites used to simulate hard-to-reproduce phenomena like fire, smoke, water, or abstract visual effects like magic glitter and faery dust.\n * @param name The name of the particle system\n * @param options The options used to create the system\n * @param sceneOrEngine The scene the particle system belongs to or the engine to use if no scene\n * @param customEffect a custom effect used to change the way particles are rendered by default\n * @param isAnimationSheetEnabled Must be true if using a spritesheet to animate the particles texture\n */\n constructor(name, options, sceneOrEngine, customEffect = null, isAnimationSheetEnabled = false) {\n super(name);\n /**\n * The layer mask we are rendering the particles through.\n */\n this.layerMask = 0x0fffffff;\n this._accumulatedCount = 0;\n this._renderVertexBuffers = [];\n this._targetIndex = 0;\n this._currentRenderId = -1;\n this._currentRenderingCameraUniqueId = -1;\n this._started = false;\n this._stopped = false;\n this._timeDelta = 0;\n /** Indicates that the update of particles is done in the animate function (and not in render). Default: false */\n this.updateInAnimate = false;\n this._actualFrame = 0;\n this._rawTextureWidth = 256;\n this._rebuildingAfterContextLost = false;\n /**\n * An event triggered when the system is disposed.\n */\n this.onDisposeObservable = new Observable();\n /**\n * An event triggered when the system is stopped\n */\n this.onStoppedObservable = new Observable();\n /**\n * Forces the particle to write their depth information to the depth buffer. This can help preventing other draw calls\n * to override the particles.\n */\n this.forceDepthWrite = false;\n this._preWarmDone = false;\n /**\n * Specifies if the particles are updated in emitter local space or world space.\n */\n this.isLocal = false;\n /** Indicates that the particle system is GPU based */\n this.isGPU = true;\n /** @internal */\n this._onBeforeDrawParticlesObservable = null;\n if (!sceneOrEngine || sceneOrEngine.getClassName() === \"Scene\") {\n this._scene = sceneOrEngine || EngineStore.LastCreatedScene;\n this._engine = this._scene.getEngine();\n this.uniqueId = this._scene.getUniqueId();\n this._scene.particleSystems.push(this);\n }\n else {\n this._engine = sceneOrEngine;\n this.defaultProjectionMatrix = Matrix.PerspectiveFovLH(0.8, 1, 0.1, 100, this._engine.isNDCHalfZRange);\n }\n if (this._engine.getCaps().supportComputeShaders) {\n if (!GetClass(\"BABYLON.ComputeShaderParticleSystem\")) {\n throw new Error(\"The ComputeShaderParticleSystem class is not available! Make sure you have imported it.\");\n }\n this._platform = new (GetClass(\"BABYLON.ComputeShaderParticleSystem\"))(this, this._engine);\n }\n else {\n if (!GetClass(\"BABYLON.WebGL2ParticleSystem\")) {\n throw new Error(\"The WebGL2ParticleSystem class is not available! Make sure you have imported it.\");\n }\n this._platform = new (GetClass(\"BABYLON.WebGL2ParticleSystem\"))(this, this._engine);\n }\n this._customWrappers = { 0: new DrawWrapper(this._engine) };\n this._customWrappers[0].effect = customEffect;\n this._drawWrappers = { 0: new DrawWrapper(this._engine) };\n if (this._drawWrappers[0].drawContext) {\n this._drawWrappers[0].drawContext.useInstancing = true;\n }\n this._createIndexBuffer();\n // Setup the default processing configuration to the scene.\n this._attachImageProcessingConfiguration(null);\n options = options ?? {};\n if (!options.randomTextureSize) {\n delete options.randomTextureSize;\n }\n const fullOptions = {\n capacity: 50000,\n randomTextureSize: this._engine.getCaps().maxTextureSize,\n ...options,\n };\n const optionsAsNumber = options;\n if (isFinite(optionsAsNumber)) {\n fullOptions.capacity = optionsAsNumber;\n }\n this._capacity = fullOptions.capacity;\n this._maxActiveParticleCount = fullOptions.capacity;\n this._currentActiveCount = 0;\n this._isAnimationSheetEnabled = isAnimationSheetEnabled;\n this.particleEmitterType = new BoxParticleEmitter();\n // Random data\n const maxTextureSize = Math.min(this._engine.getCaps().maxTextureSize, fullOptions.randomTextureSize);\n let d = [];\n for (let i = 0; i < maxTextureSize; ++i) {\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n }\n this._randomTexture = new RawTexture(new Float32Array(d), maxTextureSize, 1, 5, sceneOrEngine, false, false, 1, 1);\n this._randomTexture.name = \"GPUParticleSystem_random1\";\n this._randomTexture.wrapU = 1;\n this._randomTexture.wrapV = 1;\n d = [];\n for (let i = 0; i < maxTextureSize; ++i) {\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n d.push(Math.random());\n }\n this._randomTexture2 = new RawTexture(new Float32Array(d), maxTextureSize, 1, 5, sceneOrEngine, false, false, 1, 1);\n this._randomTexture2.name = \"GPUParticleSystem_random2\";\n this._randomTexture2.wrapU = 1;\n this._randomTexture2.wrapV = 1;\n this._randomTextureSize = maxTextureSize;\n }\n _reset() {\n this._releaseBuffers();\n }\n _createVertexBuffers(updateBuffer, renderBuffer, spriteSource) {\n const renderVertexBuffers = {};\n renderVertexBuffers[\"position\"] = renderBuffer.createVertexBuffer(\"position\", 0, 3, this._attributesStrideSize, true);\n let offset = 3;\n renderVertexBuffers[\"age\"] = renderBuffer.createVertexBuffer(\"age\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n renderVertexBuffers[\"size\"] = renderBuffer.createVertexBuffer(\"size\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n renderVertexBuffers[\"life\"] = renderBuffer.createVertexBuffer(\"life\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n offset += 4; // seed\n if (this.billboardMode === ParticleSystem.BILLBOARDMODE_STRETCHED) {\n renderVertexBuffers[\"direction\"] = renderBuffer.createVertexBuffer(\"direction\", offset, 3, this._attributesStrideSize, true);\n }\n offset += 3; // direction\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n if (this.particleEmitterType instanceof CustomParticleEmitter) {\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n }\n if (!this._colorGradientsTexture) {\n renderVertexBuffers[\"color\"] = renderBuffer.createVertexBuffer(\"color\", offset, 4, this._attributesStrideSize, true);\n offset += 4;\n }\n if (!this._isBillboardBased) {\n renderVertexBuffers[\"initialDirection\"] = renderBuffer.createVertexBuffer(\"initialDirection\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n }\n if (this.noiseTexture) {\n renderVertexBuffers[\"noiseCoordinates1\"] = renderBuffer.createVertexBuffer(\"noiseCoordinates1\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n renderVertexBuffers[\"noiseCoordinates2\"] = renderBuffer.createVertexBuffer(\"noiseCoordinates2\", offset, 3, this._attributesStrideSize, true);\n offset += 3;\n if (this._platform.alignDataInBuffer) {\n offset += 1;\n }\n }\n renderVertexBuffers[\"angle\"] = renderBuffer.createVertexBuffer(\"angle\", offset, 1, this._attributesStrideSize, true);\n if (this._angularSpeedGradientsTexture) {\n offset++;\n }\n else {\n offset += 2;\n }\n if (this._isAnimationSheetEnabled) {\n renderVertexBuffers[\"cellIndex\"] = renderBuffer.createVertexBuffer(\"cellIndex\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n if (this.spriteRandomStartCell) {\n renderVertexBuffers[\"cellStartOffset\"] = renderBuffer.createVertexBuffer(\"cellStartOffset\", offset, 1, this._attributesStrideSize, true);\n offset += 1;\n }\n }\n renderVertexBuffers[\"offset\"] = spriteSource.createVertexBuffer(\"offset\", 0, 2);\n renderVertexBuffers[\"uv\"] = spriteSource.createVertexBuffer(\"uv\", 2, 2);\n this._renderVertexBuffers.push(renderVertexBuffers);\n this._platform.createVertexBuffers(updateBuffer, renderVertexBuffers);\n this.resetDrawCache();\n }\n _initialize(force = false) {\n if (this._buffer0 && !force) {\n return;\n }\n const engine = this._engine;\n const data = [];\n this._attributesStrideSize = 21;\n this._targetIndex = 0;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 1;\n }\n if (this.particleEmitterType instanceof CustomParticleEmitter) {\n this._attributesStrideSize += 3;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 1;\n }\n }\n if (!this.isBillboardBased) {\n this._attributesStrideSize += 3;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 1;\n }\n }\n if (this._colorGradientsTexture) {\n this._attributesStrideSize -= 4;\n }\n if (this._angularSpeedGradientsTexture) {\n this._attributesStrideSize -= 1;\n }\n if (this._isAnimationSheetEnabled) {\n this._attributesStrideSize += 1;\n if (this.spriteRandomStartCell) {\n this._attributesStrideSize += 1;\n }\n }\n if (this.noiseTexture) {\n this._attributesStrideSize += 6;\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 2;\n }\n }\n if (this._platform.alignDataInBuffer) {\n this._attributesStrideSize += 3 - ((this._attributesStrideSize + 3) & 3); // round to multiple of 4\n }\n const usingCustomEmitter = this.particleEmitterType instanceof CustomParticleEmitter;\n const tmpVector = TmpVectors.Vector3[0];\n let offset = 0;\n for (let particleIndex = 0; particleIndex < this._capacity; particleIndex++) {\n // position\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n // Age\n data.push(0.0); // create the particle as a dead one to create a new one at start\n // Size\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n // life\n data.push(0.0);\n // Seed\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n // direction\n if (usingCustomEmitter) {\n this.particleEmitterType.particleDestinationGenerator(particleIndex, null, tmpVector);\n data.push(tmpVector.x);\n data.push(tmpVector.y);\n data.push(tmpVector.z);\n }\n else {\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n }\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy0\n }\n offset += 16; // position, age, size, life, seed, direction, dummy0\n if (usingCustomEmitter) {\n this.particleEmitterType.particlePositionGenerator(particleIndex, null, tmpVector);\n data.push(tmpVector.x);\n data.push(tmpVector.y);\n data.push(tmpVector.z);\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy1\n }\n offset += 4;\n }\n if (!this._colorGradientsTexture) {\n // color\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n offset += 4;\n }\n if (!this.isBillboardBased) {\n // initialDirection\n data.push(0.0);\n data.push(0.0);\n data.push(0.0);\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy2\n }\n offset += 4;\n }\n if (this.noiseTexture) {\n // Random coordinates for reading into noise texture\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy3\n }\n data.push(Math.random());\n data.push(Math.random());\n data.push(Math.random());\n if (this._platform.alignDataInBuffer) {\n data.push(0.0); // dummy4\n }\n offset += 8;\n }\n // angle\n data.push(0.0);\n offset += 1;\n if (!this._angularSpeedGradientsTexture) {\n data.push(0.0);\n offset += 1;\n }\n if (this._isAnimationSheetEnabled) {\n data.push(0.0);\n offset += 1;\n if (this.spriteRandomStartCell) {\n data.push(0.0);\n offset += 1;\n }\n }\n if (this._platform.alignDataInBuffer) {\n let numDummies = 3 - ((offset + 3) & 3);\n offset += numDummies;\n while (numDummies-- > 0) {\n data.push(0.0);\n }\n }\n }\n // Sprite data\n const spriteData = new Float32Array([0.5, 0.5, 1, 1, -0.5, 0.5, 0, 1, 0.5, -0.5, 1, 0, -0.5, -0.5, 0, 0]);\n const bufferData1 = this._platform.createParticleBuffer(data);\n const bufferData2 = this._platform.createParticleBuffer(data);\n // Buffers\n this._buffer0 = new Buffer(engine, bufferData1, false, this._attributesStrideSize);\n this._buffer1 = new Buffer(engine, bufferData2, false, this._attributesStrideSize);\n this._spriteBuffer = new Buffer(engine, spriteData, false, 4);\n // Update & Render vertex buffers\n this._renderVertexBuffers = [];\n this._createVertexBuffers(this._buffer0, this._buffer1, this._spriteBuffer);\n this._createVertexBuffers(this._buffer1, this._buffer0, this._spriteBuffer);\n // Links\n this._sourceBuffer = this._buffer0;\n this._targetBuffer = this._buffer1;\n }\n /** @internal */\n _recreateUpdateEffect() {\n this._createColorGradientTexture();\n this._createSizeGradientTexture();\n this._createAngularSpeedGradientTexture();\n this._createVelocityGradientTexture();\n this._createLimitVelocityGradientTexture();\n this._createDragGradientTexture();\n let defines = this.particleEmitterType ? this.particleEmitterType.getEffectDefines() : \"\";\n if (this._isBillboardBased) {\n defines += \"\\n#define BILLBOARD\";\n }\n if (this._colorGradientsTexture) {\n defines += \"\\n#define COLORGRADIENTS\";\n }\n if (this._sizeGradientsTexture) {\n defines += \"\\n#define SIZEGRADIENTS\";\n }\n if (this._angularSpeedGradientsTexture) {\n defines += \"\\n#define ANGULARSPEEDGRADIENTS\";\n }\n if (this._velocityGradientsTexture) {\n defines += \"\\n#define VELOCITYGRADIENTS\";\n }\n if (this._limitVelocityGradientsTexture) {\n defines += \"\\n#define LIMITVELOCITYGRADIENTS\";\n }\n if (this._dragGradientsTexture) {\n defines += \"\\n#define DRAGGRADIENTS\";\n }\n if (this.isAnimationSheetEnabled) {\n defines += \"\\n#define ANIMATESHEET\";\n if (this.spriteRandomStartCell) {\n defines += \"\\n#define ANIMATESHEETRANDOMSTART\";\n }\n }\n if (this.noiseTexture) {\n defines += \"\\n#define NOISE\";\n }\n if (this.isLocal) {\n defines += \"\\n#define LOCAL\";\n }\n if (this._platform.isUpdateBufferCreated() && this._cachedUpdateDefines === defines) {\n return this._platform.isUpdateBufferReady();\n }\n this._cachedUpdateDefines = defines;\n this._updateBuffer = this._platform.createUpdateBuffer(defines);\n return this._platform.isUpdateBufferReady();\n }\n /**\n * @internal\n */\n _getWrapper(blendMode) {\n const customWrapper = this._getCustomDrawWrapper(blendMode);\n if (customWrapper?.effect) {\n return customWrapper;\n }\n const defines = [];\n this.fillDefines(defines, blendMode);\n // Effect\n let drawWrapper = this._drawWrappers[blendMode];\n if (!drawWrapper) {\n drawWrapper = new DrawWrapper(this._engine);\n if (drawWrapper.drawContext) {\n drawWrapper.drawContext.useInstancing = true;\n }\n this._drawWrappers[blendMode] = drawWrapper;\n }\n const join = defines.join(\"\\n\");\n if (drawWrapper.defines !== join) {\n const attributes = [];\n const uniforms = [];\n const samplers = [];\n this.fillUniformsAttributesAndSamplerNames(uniforms, attributes, samplers);\n drawWrapper.setEffect(this._engine.createEffect(\"gpuRenderParticles\", attributes, uniforms, samplers, join), join);\n }\n return drawWrapper;\n }\n /**\n * @internal\n */\n static _GetAttributeNamesOrOptions(hasColorGradients = false, isAnimationSheetEnabled = false, isBillboardBased = false, isBillboardStretched = false) {\n const attributeNamesOrOptions = [VertexBuffer.PositionKind, \"age\", \"life\", \"size\", \"angle\"];\n if (!hasColorGradients) {\n attributeNamesOrOptions.push(VertexBuffer.ColorKind);\n }\n if (isAnimationSheetEnabled) {\n attributeNamesOrOptions.push(\"cellIndex\");\n }\n if (!isBillboardBased) {\n attributeNamesOrOptions.push(\"initialDirection\");\n }\n if (isBillboardStretched) {\n attributeNamesOrOptions.push(\"direction\");\n }\n attributeNamesOrOptions.push(\"offset\", VertexBuffer.UVKind);\n return attributeNamesOrOptions;\n }\n /**\n * @internal\n */\n static _GetEffectCreationOptions(isAnimationSheetEnabled = false, useLogarithmicDepth = false, applyFog = false) {\n const effectCreationOption = [\"emitterWM\", \"worldOffset\", \"view\", \"projection\", \"colorDead\", \"invView\", \"translationPivot\", \"eyePosition\"];\n addClipPlaneUniforms(effectCreationOption);\n if (isAnimationSheetEnabled) {\n effectCreationOption.push(\"sheetInfos\");\n }\n if (useLogarithmicDepth) {\n effectCreationOption.push(\"logarithmicDepthConstant\");\n }\n if (applyFog) {\n effectCreationOption.push(\"vFogInfos\");\n effectCreationOption.push(\"vFogColor\");\n }\n return effectCreationOption;\n }\n /**\n * Fill the defines array according to the current settings of the particle system\n * @param defines Array to be updated\n * @param blendMode blend mode to take into account when updating the array\n * @param fillImageProcessing fills the image processing defines\n */\n fillDefines(defines, blendMode = 0, fillImageProcessing = true) {\n if (this._scene) {\n prepareStringDefinesForClipPlanes(this, this._scene, defines);\n if (this.applyFog && this._scene.fogEnabled && this._scene.fogMode !== Scene.FOGMODE_NONE) {\n defines.push(\"#define FOG\");\n }\n }\n if (blendMode === ParticleSystem.BLENDMODE_MULTIPLY) {\n defines.push(\"#define BLENDMULTIPLYMODE\");\n }\n if (this.isLocal) {\n defines.push(\"#define LOCAL\");\n }\n if (this.useLogarithmicDepth) {\n defines.push(\"#define LOGARITHMICDEPTH\");\n }\n if (this._isBillboardBased) {\n defines.push(\"#define BILLBOARD\");\n switch (this.billboardMode) {\n case ParticleSystem.BILLBOARDMODE_Y:\n defines.push(\"#define BILLBOARDY\");\n break;\n case ParticleSystem.BILLBOARDMODE_STRETCHED:\n defines.push(\"#define BILLBOARDSTRETCHED\");\n break;\n case ParticleSystem.BILLBOARDMODE_ALL:\n defines.push(\"#define BILLBOARDMODE_ALL\");\n break;\n default:\n break;\n }\n }\n if (this._colorGradientsTexture) {\n defines.push(\"#define COLORGRADIENTS\");\n }\n if (this.isAnimationSheetEnabled) {\n defines.push(\"#define ANIMATESHEET\");\n }\n if (fillImageProcessing && this._imageProcessingConfiguration) {\n this._imageProcessingConfiguration.prepareDefines(this._imageProcessingConfigurationDefines);\n defines.push(\"\" + this._imageProcessingConfigurationDefines.toString());\n }\n }\n /**\n * Fill the uniforms, attributes and samplers arrays according to the current settings of the particle system\n * @param uniforms Uniforms array to fill\n * @param attributes Attributes array to fill\n * @param samplers Samplers array to fill\n */\n fillUniformsAttributesAndSamplerNames(uniforms, attributes, samplers) {\n attributes.push(...GPUParticleSystem._GetAttributeNamesOrOptions(!!this._colorGradientsTexture, this._isAnimationSheetEnabled, this._isBillboardBased, this._isBillboardBased && this.billboardMode === ParticleSystem.BILLBOARDMODE_STRETCHED));\n uniforms.push(...GPUParticleSystem._GetEffectCreationOptions(this._isAnimationSheetEnabled, this.useLogarithmicDepth, this.applyFog));\n samplers.push(\"diffuseSampler\", \"colorGradientSampler\");\n if (this._imageProcessingConfiguration) {\n ImageProcessingConfiguration.PrepareUniforms(uniforms, this._imageProcessingConfigurationDefines);\n ImageProcessingConfiguration.PrepareSamplers(samplers, this._imageProcessingConfigurationDefines);\n }\n }\n /**\n * Animates the particle system for the current frame by emitting new particles and or animating the living ones.\n * @param preWarm defines if we are in the pre-warmimg phase\n */\n animate(preWarm = false) {\n this._timeDelta = this.updateSpeed * (preWarm ? this.preWarmStepOffset : this._scene?.getAnimationRatio() || 1);\n this._actualFrame += this._timeDelta;\n if (!this._stopped) {\n if (this.targetStopDuration && this._actualFrame >= this.targetStopDuration) {\n this.stop();\n }\n }\n if (this.updateInAnimate) {\n this._update();\n }\n }\n _createFactorGradientTexture(factorGradients, textureName) {\n const texture = this[textureName];\n if (!factorGradients || !factorGradients.length || texture) {\n return;\n }\n const data = new Float32Array(this._rawTextureWidth);\n for (let x = 0; x < this._rawTextureWidth; x++) {\n const ratio = x / this._rawTextureWidth;\n GradientHelper.GetCurrentGradient(ratio, factorGradients, (currentGradient, nextGradient, scale) => {\n data[x] = Lerp(currentGradient.factor1, nextGradient.factor1, scale);\n });\n }\n this[textureName] = RawTexture.CreateRTexture(data, this._rawTextureWidth, 1, this._scene || this._engine, false, false, 1);\n this[textureName].name = textureName.substring(1);\n }\n _createSizeGradientTexture() {\n this._createFactorGradientTexture(this._sizeGradients, \"_sizeGradientsTexture\");\n }\n _createAngularSpeedGradientTexture() {\n this._createFactorGradientTexture(this._angularSpeedGradients, \"_angularSpeedGradientsTexture\");\n }\n _createVelocityGradientTexture() {\n this._createFactorGradientTexture(this._velocityGradients, \"_velocityGradientsTexture\");\n }\n _createLimitVelocityGradientTexture() {\n this._createFactorGradientTexture(this._limitVelocityGradients, \"_limitVelocityGradientsTexture\");\n }\n _createDragGradientTexture() {\n this._createFactorGradientTexture(this._dragGradients, \"_dragGradientsTexture\");\n }\n _createColorGradientTexture() {\n if (!this._colorGradients || !this._colorGradients.length || this._colorGradientsTexture) {\n return;\n }\n const data = new Uint8Array(this._rawTextureWidth * 4);\n const tmpColor = TmpColors.Color4[0];\n for (let x = 0; x < this._rawTextureWidth; x++) {\n const ratio = x / this._rawTextureWidth;\n GradientHelper.GetCurrentGradient(ratio, this._colorGradients, (currentGradient, nextGradient, scale) => {\n Color4.LerpToRef(currentGradient.color1, nextGradient.color1, scale, tmpColor);\n data[x * 4] = tmpColor.r * 255;\n data[x * 4 + 1] = tmpColor.g * 255;\n data[x * 4 + 2] = tmpColor.b * 255;\n data[x * 4 + 3] = tmpColor.a * 255;\n });\n }\n this._colorGradientsTexture = RawTexture.CreateRGBATexture(data, this._rawTextureWidth, 1, this._scene, false, false, 1);\n this._colorGradientsTexture.name = \"colorGradients\";\n }\n _render(blendMode, emitterWM) {\n // Enable render effect\n const drawWrapper = this._getWrapper(blendMode);\n const effect = drawWrapper.effect;\n this._engine.enableEffect(drawWrapper);\n const viewMatrix = this._scene?.getViewMatrix() || Matrix.IdentityReadOnly;\n effect.setMatrix(\"view\", viewMatrix);\n effect.setMatrix(\"projection\", this.defaultProjectionMatrix ?? this._scene.getProjectionMatrix());\n effect.setTexture(\"diffuseSampler\", this.particleTexture);\n effect.setVector2(\"translationPivot\", this.translationPivot);\n effect.setVector3(\"worldOffset\", this.worldOffset);\n if (this.isLocal) {\n effect.setMatrix(\"emitterWM\", emitterWM);\n }\n if (this._colorGradientsTexture) {\n effect.setTexture(\"colorGradientSampler\", this._colorGradientsTexture);\n }\n else {\n effect.setDirectColor4(\"colorDead\", this.colorDead);\n }\n if (this._isAnimationSheetEnabled && this.particleTexture) {\n const baseSize = this.particleTexture.getBaseSize();\n effect.setFloat3(\"sheetInfos\", this.spriteCellWidth / baseSize.width, this.spriteCellHeight / baseSize.height, baseSize.width / this.spriteCellWidth);\n }\n if (this._isBillboardBased && this._scene) {\n const camera = this._scene.activeCamera;\n effect.setVector3(\"eyePosition\", camera.globalPosition);\n }\n const defines = effect.defines;\n if (this._scene) {\n bindClipPlane(effect, this, this._scene);\n if (this.applyFog) {\n BindFogParameters(this._scene, undefined, effect);\n }\n }\n if (defines.indexOf(\"#define BILLBOARDMODE_ALL\") >= 0) {\n const invView = viewMatrix.clone();\n invView.invert();\n effect.setMatrix(\"invView\", invView);\n }\n // Log. depth\n if (this.useLogarithmicDepth && this._scene) {\n BindLogDepth(defines, effect, this._scene);\n }\n // image processing\n if (this._imageProcessingConfiguration && !this._imageProcessingConfiguration.applyByPostProcess) {\n this._imageProcessingConfiguration.bind(effect);\n }\n // Draw order\n switch (blendMode) {\n case ParticleSystem.BLENDMODE_ADD:\n this._engine.setAlphaMode(1);\n break;\n case ParticleSystem.BLENDMODE_ONEONE:\n this._engine.setAlphaMode(6);\n break;\n case ParticleSystem.BLENDMODE_STANDARD:\n this._engine.setAlphaMode(2);\n break;\n case ParticleSystem.BLENDMODE_MULTIPLY:\n this._engine.setAlphaMode(4);\n break;\n }\n // Bind source VAO\n this._platform.bindDrawBuffers(this._targetIndex, effect, this._scene?.forceWireframe ? this._linesIndexBufferUseInstancing : null);\n if (this._onBeforeDrawParticlesObservable) {\n this._onBeforeDrawParticlesObservable.notifyObservers(effect);\n }\n // Render\n if (this._scene?.forceWireframe) {\n this._engine.drawElementsType(6, 0, 10, this._currentActiveCount);\n }\n else {\n this._engine.drawArraysType(7, 0, 4, this._currentActiveCount);\n }\n this._engine.setAlphaMode(0);\n if (this._scene?.forceWireframe) {\n this._engine.unbindInstanceAttributes();\n }\n return this._currentActiveCount;\n }\n /** @internal */\n _update(emitterWM) {\n if (!this.emitter || !this._targetBuffer) {\n return;\n }\n if (!this._recreateUpdateEffect() || this._rebuildingAfterContextLost) {\n return;\n }\n if (!emitterWM) {\n if (this.emitter.position) {\n const emitterMesh = this.emitter;\n emitterWM = emitterMesh.getWorldMatrix();\n }\n else {\n const emitterPosition = this.emitter;\n emitterWM = TmpVectors.Matrix[0];\n Matrix.TranslationToRef(emitterPosition.x, emitterPosition.y, emitterPosition.z, emitterWM);\n }\n }\n this._platform.preUpdateParticleBuffer();\n this._updateBuffer.setFloat(\"currentCount\", this._currentActiveCount);\n this._updateBuffer.setFloat(\"timeDelta\", this._timeDelta);\n this._updateBuffer.setFloat(\"stopFactor\", this._stopped ? 0 : 1);\n this._updateBuffer.setInt(\"randomTextureSize\", this._randomTextureSize);\n this._updateBuffer.setFloat2(\"lifeTime\", this.minLifeTime, this.maxLifeTime);\n this._updateBuffer.setFloat2(\"emitPower\", this.minEmitPower, this.maxEmitPower);\n if (!this._colorGradientsTexture) {\n this._updateBuffer.setDirectColor4(\"color1\", this.color1);\n this._updateBuffer.setDirectColor4(\"color2\", this.color2);\n }\n this._updateBuffer.setFloat2(\"sizeRange\", this.minSize, this.maxSize);\n this._updateBuffer.setFloat4(\"scaleRange\", this.minScaleX, this.maxScaleX, this.minScaleY, this.maxScaleY);\n this._updateBuffer.setFloat4(\"angleRange\", this.minAngularSpeed, this.maxAngularSpeed, this.minInitialRotation, this.maxInitialRotation);\n this._updateBuffer.setVector3(\"gravity\", this.gravity);\n if (this._limitVelocityGradientsTexture) {\n this._updateBuffer.setFloat(\"limitVelocityDamping\", this.limitVelocityDamping);\n }\n if (this.particleEmitterType) {\n this.particleEmitterType.applyToShader(this._updateBuffer);\n }\n if (this._isAnimationSheetEnabled) {\n this._updateBuffer.setFloat4(\"cellInfos\", this.startSpriteCellID, this.endSpriteCellID, this.spriteCellChangeSpeed, this.spriteCellLoop ? 1 : 0);\n }\n if (this.noiseTexture) {\n this._updateBuffer.setVector3(\"noiseStrength\", this.noiseStrength);\n }\n if (!this.isLocal) {\n this._updateBuffer.setMatrix(\"emitterWM\", emitterWM);\n }\n this._platform.updateParticleBuffer(this._targetIndex, this._targetBuffer, this._currentActiveCount);\n // Switch VAOs\n this._targetIndex++;\n if (this._targetIndex === 2) {\n this._targetIndex = 0;\n }\n // Switch buffers\n const tmpBuffer = this._sourceBuffer;\n this._sourceBuffer = this._targetBuffer;\n this._targetBuffer = tmpBuffer;\n }\n /**\n * Renders the particle system in its current state\n * @param preWarm defines if the system should only update the particles but not render them\n * @param forceUpdateOnly if true, force to only update the particles and never display them (meaning, even if preWarm=false, when forceUpdateOnly=true the particles won't be displayed)\n * @returns the current number of particles\n */\n render(preWarm = false, forceUpdateOnly = false) {\n if (!this._started) {\n return 0;\n }\n if (!this.isReady()) {\n return 0;\n }\n if (!preWarm && this._scene) {\n if (!this._preWarmDone && this.preWarmCycles) {\n for (let index = 0; index < this.preWarmCycles; index++) {\n this.animate(true);\n this.render(true, true);\n }\n this._preWarmDone = true;\n }\n if (this._currentRenderId === this._scene.getRenderId() &&\n (!this._scene.activeCamera || (this._scene.activeCamera && this._currentRenderingCameraUniqueId === this._scene.activeCamera.uniqueId))) {\n return 0;\n }\n this._currentRenderId = this._scene.getRenderId();\n if (this._scene.activeCamera) {\n this._currentRenderingCameraUniqueId = this._scene.activeCamera.uniqueId;\n }\n }\n // Get everything ready to render\n this._initialize();\n this._accumulatedCount += this.emitRate * this._timeDelta;\n if (this._accumulatedCount > 1) {\n const intPart = this._accumulatedCount | 0;\n this._accumulatedCount -= intPart;\n this._currentActiveCount += intPart;\n }\n this._currentActiveCount = Math.min(this._maxActiveParticleCount, this._currentActiveCount);\n if (!this._currentActiveCount) {\n return 0;\n }\n // Enable update effect\n let emitterWM;\n if (this.emitter.position) {\n const emitterMesh = this.emitter;\n emitterWM = emitterMesh.getWorldMatrix();\n }\n else {\n const emitterPosition = this.emitter;\n emitterWM = TmpVectors.Matrix[0];\n Matrix.TranslationToRef(emitterPosition.x, emitterPosition.y, emitterPosition.z, emitterWM);\n }\n const engine = this._engine;\n if (!this.updateInAnimate) {\n this._update(emitterWM);\n }\n let outparticles = 0;\n if (!preWarm && !forceUpdateOnly) {\n engine.setState(false);\n if (this.forceDepthWrite) {\n engine.setDepthWrite(true);\n }\n if (this.blendMode === ParticleSystem.BLENDMODE_MULTIPLYADD) {\n outparticles = this._render(ParticleSystem.BLENDMODE_MULTIPLY, emitterWM) + this._render(ParticleSystem.BLENDMODE_ADD, emitterWM);\n }\n else {\n outparticles = this._render(this.blendMode, emitterWM);\n }\n this._engine.setAlphaMode(0);\n }\n return outparticles;\n }\n /**\n * Rebuilds the particle system\n */\n rebuild() {\n const checkUpdateEffect = () => {\n if (!this._recreateUpdateEffect() || !this._platform.isUpdateBufferReady()) {\n setTimeout(checkUpdateEffect, 10);\n }\n else {\n this._initialize(true);\n this._rebuildingAfterContextLost = false;\n }\n };\n this._createIndexBuffer();\n this._cachedUpdateDefines = \"\";\n this._platform.contextLost();\n this._rebuildingAfterContextLost = true;\n checkUpdateEffect();\n }\n _releaseBuffers() {\n if (this._buffer0) {\n this._buffer0.dispose();\n this._buffer0 = null;\n }\n if (this._buffer1) {\n this._buffer1.dispose();\n this._buffer1 = null;\n }\n if (this._spriteBuffer) {\n this._spriteBuffer.dispose();\n this._spriteBuffer = null;\n }\n this._platform.releaseBuffers();\n }\n /**\n * Disposes the particle system and free the associated resources\n * @param disposeTexture defines if the particule texture must be disposed as well (true by default)\n */\n dispose(disposeTexture = true) {\n for (const blendMode in this._drawWrappers) {\n const drawWrapper = this._drawWrappers[blendMode];\n drawWrapper.dispose();\n }\n this._drawWrappers = {};\n if (this._scene) {\n const index = this._scene.particleSystems.indexOf(this);\n if (index > -1) {\n this._scene.particleSystems.splice(index, 1);\n }\n }\n this._releaseBuffers();\n this._platform.releaseVertexBuffers();\n for (let i = 0; i < this._renderVertexBuffers.length; ++i) {\n const rvb = this._renderVertexBuffers[i];\n for (const key in rvb) {\n rvb[key].dispose();\n }\n }\n this._renderVertexBuffers = [];\n if (this._colorGradientsTexture) {\n this._colorGradientsTexture.dispose();\n this._colorGradientsTexture = null;\n }\n if (this._sizeGradientsTexture) {\n this._sizeGradientsTexture.dispose();\n this._sizeGradientsTexture = null;\n }\n if (this._angularSpeedGradientsTexture) {\n this._angularSpeedGradientsTexture.dispose();\n this._angularSpeedGradientsTexture = null;\n }\n if (this._velocityGradientsTexture) {\n this._velocityGradientsTexture.dispose();\n this._velocityGradientsTexture = null;\n }\n if (this._limitVelocityGradientsTexture) {\n this._limitVelocityGradientsTexture.dispose();\n this._limitVelocityGradientsTexture = null;\n }\n if (this._dragGradientsTexture) {\n this._dragGradientsTexture.dispose();\n this._dragGradientsTexture = null;\n }\n if (this._randomTexture) {\n this._randomTexture.dispose();\n this._randomTexture = null;\n }\n if (this._randomTexture2) {\n this._randomTexture2.dispose();\n this._randomTexture2 = null;\n }\n if (disposeTexture && this.particleTexture) {\n this.particleTexture.dispose();\n this.particleTexture = null;\n }\n if (disposeTexture && this.noiseTexture) {\n this.noiseTexture.dispose();\n this.noiseTexture = null;\n }\n // Callback\n this.onStoppedObservable.clear();\n this.onDisposeObservable.notifyObservers(this);\n this.onDisposeObservable.clear();\n }\n /**\n * Clones the particle system.\n * @param name The name of the cloned object\n * @param newEmitter The new emitter to use\n * @param cloneTexture Also clone the textures if true\n * @returns the cloned particle system\n */\n clone(name, newEmitter, cloneTexture = false) {\n const custom = { ...this._customWrappers };\n let program = null;\n const engine = this._engine;\n if (engine.createEffectForParticles) {\n if (this.customShader != null) {\n program = this.customShader;\n const defines = program.shaderOptions.defines.length > 0 ? program.shaderOptions.defines.join(\"\\n\") : \"\";\n custom[0] = engine.createEffectForParticles(program.shaderPath.fragmentElement, program.shaderOptions.uniforms, program.shaderOptions.samplers, defines, undefined, undefined, undefined, this);\n }\n }\n const serialization = this.serialize(cloneTexture);\n const result = GPUParticleSystem.Parse(serialization, this._scene || this._engine, this._rootUrl);\n result.name = name;\n result.customShader = program;\n result._customWrappers = custom;\n if (newEmitter === undefined) {\n newEmitter = this.emitter;\n }\n if (this.noiseTexture) {\n result.noiseTexture = this.noiseTexture.clone();\n }\n result.emitter = newEmitter;\n return result;\n }\n /**\n * Serializes the particle system to a JSON object\n * @param serializeTexture defines if the texture must be serialized as well\n * @returns the JSON object\n */\n serialize(serializeTexture = false) {\n const serializationObject = {};\n ParticleSystem._Serialize(serializationObject, this, serializeTexture);\n serializationObject.activeParticleCount = this.activeParticleCount;\n serializationObject.randomTextureSize = this._randomTextureSize;\n serializationObject.customShader = this.customShader;\n return serializationObject;\n }\n /**\n * Parses a JSON object to create a GPU particle system.\n * @param parsedParticleSystem The JSON object to parse\n * @param sceneOrEngine The scene or the engine to create the particle system in\n * @param rootUrl The root url to use to load external dependencies like texture\n * @param doNotStart Ignore the preventAutoStart attribute and does not start\n * @param capacity defines the system capacity (if null or undefined the sotred capacity will be used)\n * @returns the parsed GPU particle system\n */\n static Parse(parsedParticleSystem, sceneOrEngine, rootUrl, doNotStart = false, capacity) {\n const name = parsedParticleSystem.name;\n let engine;\n let scene;\n if (sceneOrEngine instanceof AbstractEngine) {\n engine = sceneOrEngine;\n }\n else {\n scene = sceneOrEngine;\n engine = scene.getEngine();\n }\n const particleSystem = new GPUParticleSystem(name, { capacity: capacity || parsedParticleSystem.capacity, randomTextureSize: parsedParticleSystem.randomTextureSize }, sceneOrEngine, null, parsedParticleSystem.isAnimationSheetEnabled);\n particleSystem._rootUrl = rootUrl;\n if (parsedParticleSystem.customShader && engine.createEffectForParticles) {\n const program = parsedParticleSystem.customShader;\n const defines = program.shaderOptions.defines.length > 0 ? program.shaderOptions.defines.join(\"\\n\") : \"\";\n const custom = engine.createEffectForParticles(program.shaderPath.fragmentElement, program.shaderOptions.uniforms, program.shaderOptions.samplers, defines, undefined, undefined, undefined, particleSystem);\n particleSystem.setCustomEffect(custom, 0);\n particleSystem.customShader = program;\n }\n if (parsedParticleSystem.id) {\n particleSystem.id = parsedParticleSystem.id;\n }\n if (parsedParticleSystem.activeParticleCount) {\n particleSystem.activeParticleCount = parsedParticleSystem.activeParticleCount;\n }\n ParticleSystem._Parse(parsedParticleSystem, particleSystem, sceneOrEngine, rootUrl);\n // Auto start\n if (parsedParticleSystem.preventAutoStart) {\n particleSystem.preventAutoStart = parsedParticleSystem.preventAutoStart;\n }\n if (!doNotStart && !particleSystem.preventAutoStart) {\n particleSystem.start();\n }\n return particleSystem;\n 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