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- {"ast":null,"code":"import _asyncToGenerator from \"F:/workspace/202226701027/huinongbao-app/node_modules/@babel/runtime/helpers/esm/asyncToGenerator.js\";\nimport { FactorGradient, ColorGradient, Color3Gradient, GradientHelper } from \"../Misc/gradients.js\";\nimport { Observable } from \"../Misc/observable.js\";\nimport { Vector3, Matrix, Vector4, TmpVectors } from \"../Maths/math.vector.js\";\nimport { VertexBuffer, Buffer } from \"../Buffers/buffer.js\";\nimport { RawTexture } from \"../Materials/Textures/rawTexture.js\";\nimport { EngineStore } from \"../Engines/engineStore.js\";\nimport { BaseParticleSystem } from \"./baseParticleSystem.js\";\nimport { Particle } from \"./particle.js\";\nimport { DrawWrapper } from \"../Materials/drawWrapper.js\";\nimport { Color4, Color3, TmpColors } from \"../Maths/math.color.js\";\nimport \"../Engines/Extensions/engine.alpha.js\";\nimport { addClipPlaneUniforms, prepareStringDefinesForClipPlanes, bindClipPlane } from \"../Materials/clipPlaneMaterialHelper.js\";\nimport { BindFogParameters, BindLogDepth } from \"../Materials/materialHelper.functions.js\";\nimport { BoxParticleEmitter } from \"./EmitterTypes/boxParticleEmitter.js\";\nimport { Clamp, Lerp, RandomRange } from \"../Maths/math.scalar.functions.js\";\nimport { PrepareSamplersForImageProcessing, PrepareUniformsForImageProcessing } from \"../Materials/imageProcessingConfiguration.functions.js\";\n/**\n * This represents a thin particle system in Babylon.\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 * Particles can take different shapes while emitted like box, sphere, cone or you can write your custom function.\n * This thin version contains a limited subset of the total features in order to provide users with a way to get particles but with a smaller footprint\n * @example https://doc.babylonjs.com/features/featuresDeepDive/particles/particle_system/particle_system_intro\n */\nexport class ThinParticleSystem extends BaseParticleSystem {\n /**\n * Sets a callback that will be triggered when the system is disposed\n */\n set onDispose(callback) {\n if (this._onDisposeObserver) {\n this.onDisposeObservable.remove(this._onDisposeObserver);\n }\n this._onDisposeObserver = this.onDisposeObservable.add(callback);\n }\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 return this._useRampGradients;\n }\n set useRampGradients(value) {\n if (this._useRampGradients === value) {\n return;\n }\n this._useRampGradients = value;\n this._resetEffect();\n }\n /**\n * Gets the current list of active particles\n */\n get particles() {\n return this._particles;\n }\n /**\n * Gets the shader language used in this material.\n */\n get shaderLanguage() {\n return this._shaderLanguage;\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._particles.length;\n }\n /**\n * Returns the string \"ParticleSystem\"\n * @returns a string containing the class name\n */\n getClassName() {\n return \"ParticleSystem\";\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 this._stopped && this.isAlive();\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 if (this._customWrappers[blendMode].drawContext) {\n this._customWrappers[blendMode].drawContext.useInstancing = this._useInstancing;\n }\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 \"particles\";\n }\n /**\n * Gets the vertex buffers used by the particle system\n */\n get vertexBuffers() {\n return this._vertexBuffers;\n }\n /**\n * Gets the index buffer used by the particle system (or null if no index buffer is used (if _useInstancing=true))\n */\n get indexBuffer() {\n return this._indexBuffer;\n }\n /**\n * Instantiates a 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 capacity The max number of particles alive at the same time\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 * @param epsilon Offset used to render the particles\n */\n constructor(name, capacity, sceneOrEngine, customEffect = null, isAnimationSheetEnabled = false, epsilon = 0.01) {\n super(name);\n this._emitterInverseWorldMatrix = Matrix.Identity();\n /**\n * @internal\n */\n this._inheritedVelocityOffset = new Vector3();\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 this._particles = new Array();\n this._stockParticles = new Array();\n this._newPartsExcess = 0;\n this._vertexBuffers = {};\n this._scaledColorStep = new Color4(0, 0, 0, 0);\n this._colorDiff = new Color4(0, 0, 0, 0);\n this._scaledDirection = Vector3.Zero();\n this._scaledGravity = Vector3.Zero();\n this._currentRenderId = -1;\n this._useInstancing = false;\n this._started = false;\n this._stopped = false;\n this._actualFrame = 0;\n /** @internal */\n this._currentEmitRate1 = 0;\n /** @internal */\n this._currentEmitRate2 = 0;\n /** @internal */\n this._currentStartSize1 = 0;\n /** @internal */\n this._currentStartSize2 = 0;\n /** Indicates that the update of particles is done in the animate function */\n this.updateInAnimate = true;\n this._rawTextureWidth = 256;\n this._useRampGradients = 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 CPU based */\n this.isGPU = false;\n /** Shader language used by the material */\n this._shaderLanguage = 0 /* ShaderLanguage.GLSL */;\n /** @internal */\n this._onBeforeDrawParticlesObservable = null;\n /** @internal */\n this._emitFromParticle = particle => {\n // Do nothing\n };\n // start of sub system methods\n /**\n * \"Recycles\" one of the particle by copying it back to the \"stock\" of particles and removing it from the active list.\n * Its lifetime will start back at 0.\n * @param particle\n */\n this.recycleParticle = particle => {\n // move particle from activeParticle list to stock particles\n const lastParticle = this._particles.pop();\n if (lastParticle !== particle) {\n lastParticle.copyTo(particle);\n }\n this._stockParticles.push(lastParticle);\n };\n this._createParticle = () => {\n let particle;\n if (this._stockParticles.length !== 0) {\n particle = this._stockParticles.pop();\n particle._reset();\n } else {\n particle = new Particle(this);\n }\n this._prepareParticle(particle);\n return particle;\n };\n this._shadersLoaded = false;\n this._capacity = capacity;\n this._epsilon = epsilon;\n this._isAnimationSheetEnabled = isAnimationSheetEnabled;\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().vertexArrayObject) {\n this._vertexArrayObject = null;\n }\n this._initShaderSourceAsync();\n // Setup the default processing configuration to the scene.\n this._attachImageProcessingConfiguration(null);\n // eslint-disable-next-line @typescript-eslint/naming-convention\n this._customWrappers = {\n 0: new DrawWrapper(this._engine)\n };\n this._customWrappers[0].effect = customEffect;\n this._drawWrappers = [];\n this._useInstancing = this._engine.getCaps().instancedArrays;\n this._createIndexBuffer();\n this._createVertexBuffers();\n // Default emitter type\n this.particleEmitterType = new BoxParticleEmitter();\n let noiseTextureData = null;\n // Update\n this.updateFunction = particles => {\n let noiseTextureSize = null;\n if (this.noiseTexture) {\n var _this$noiseTexture$ge;\n // We need to get texture data back to CPU\n noiseTextureSize = this.noiseTexture.getSize();\n (_this$noiseTexture$ge = this.noiseTexture.getContent()) === null || _this$noiseTexture$ge === void 0 || _this$noiseTexture$ge.then(data => {\n noiseTextureData = data;\n });\n }\n const sameParticleArray = particles === this._particles;\n for (let index = 0; index < particles.length; index++) {\n const particle = particles[index];\n let scaledUpdateSpeed = this._scaledUpdateSpeed;\n const previousAge = particle.age;\n particle.age += scaledUpdateSpeed;\n // Evaluate step to death\n if (particle.age > particle.lifeTime) {\n const diff = particle.age - previousAge;\n const oldDiff = particle.lifeTime - previousAge;\n scaledUpdateSpeed = oldDiff * scaledUpdateSpeed / diff;\n particle.age = particle.lifeTime;\n }\n const ratio = particle.age / particle.lifeTime;\n // Color\n if (this._colorGradients && this._colorGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._colorGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentColorGradient) {\n particle._currentColor1.copyFrom(particle._currentColor2);\n nextGradient.getColorToRef(particle._currentColor2);\n particle._currentColorGradient = currentGradient;\n }\n Color4.LerpToRef(particle._currentColor1, particle._currentColor2, scale, particle.color);\n });\n } else {\n particle.colorStep.scaleToRef(scaledUpdateSpeed, this._scaledColorStep);\n particle.color.addInPlace(this._scaledColorStep);\n if (particle.color.a < 0) {\n particle.color.a = 0;\n }\n }\n // Angular speed\n if (this._angularSpeedGradients && this._angularSpeedGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._angularSpeedGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentAngularSpeedGradient) {\n particle._currentAngularSpeed1 = particle._currentAngularSpeed2;\n particle._currentAngularSpeed2 = nextGradient.getFactor();\n particle._currentAngularSpeedGradient = currentGradient;\n }\n particle.angularSpeed = Lerp(particle._currentAngularSpeed1, particle._currentAngularSpeed2, scale);\n });\n }\n particle.angle += particle.angularSpeed * scaledUpdateSpeed;\n // Direction\n let directionScale = scaledUpdateSpeed;\n /// Velocity\n if (this._velocityGradients && this._velocityGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._velocityGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentVelocityGradient) {\n particle._currentVelocity1 = particle._currentVelocity2;\n particle._currentVelocity2 = nextGradient.getFactor();\n particle._currentVelocityGradient = currentGradient;\n }\n directionScale *= Lerp(particle._currentVelocity1, particle._currentVelocity2, scale);\n });\n }\n particle.direction.scaleToRef(directionScale, this._scaledDirection);\n /// Limit velocity\n if (this._limitVelocityGradients && this._limitVelocityGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._limitVelocityGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentLimitVelocityGradient) {\n particle._currentLimitVelocity1 = particle._currentLimitVelocity2;\n particle._currentLimitVelocity2 = nextGradient.getFactor();\n particle._currentLimitVelocityGradient = currentGradient;\n }\n const limitVelocity = Lerp(particle._currentLimitVelocity1, particle._currentLimitVelocity2, scale);\n const currentVelocity = particle.direction.length();\n if (currentVelocity > limitVelocity) {\n particle.direction.scaleInPlace(this.limitVelocityDamping);\n }\n });\n }\n /// Drag\n if (this._dragGradients && this._dragGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._dragGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentDragGradient) {\n particle._currentDrag1 = particle._currentDrag2;\n particle._currentDrag2 = nextGradient.getFactor();\n particle._currentDragGradient = currentGradient;\n }\n const drag = Lerp(particle._currentDrag1, particle._currentDrag2, scale);\n this._scaledDirection.scaleInPlace(1.0 - drag);\n });\n }\n if (this.isLocal && particle._localPosition) {\n particle._localPosition.addInPlace(this._scaledDirection);\n Vector3.TransformCoordinatesToRef(particle._localPosition, this._emitterWorldMatrix, particle.position);\n } else {\n particle.position.addInPlace(this._scaledDirection);\n }\n // Noise\n if (noiseTextureData && noiseTextureSize && particle._randomNoiseCoordinates1) {\n const fetchedColorR = this._fetchR(particle._randomNoiseCoordinates1.x, particle._randomNoiseCoordinates1.y, noiseTextureSize.width, noiseTextureSize.height, noiseTextureData);\n const fetchedColorG = this._fetchR(particle._randomNoiseCoordinates1.z, particle._randomNoiseCoordinates2.x, noiseTextureSize.width, noiseTextureSize.height, noiseTextureData);\n const fetchedColorB = this._fetchR(particle._randomNoiseCoordinates2.y, particle._randomNoiseCoordinates2.z, noiseTextureSize.width, noiseTextureSize.height, noiseTextureData);\n const force = TmpVectors.Vector3[0];\n const scaledForce = TmpVectors.Vector3[1];\n force.copyFromFloats((2 * fetchedColorR - 1) * this.noiseStrength.x, (2 * fetchedColorG - 1) * this.noiseStrength.y, (2 * fetchedColorB - 1) * this.noiseStrength.z);\n force.scaleToRef(scaledUpdateSpeed, scaledForce);\n particle.direction.addInPlace(scaledForce);\n }\n // Gravity\n this.gravity.scaleToRef(scaledUpdateSpeed, this._scaledGravity);\n particle.direction.addInPlace(this._scaledGravity);\n // Size\n if (this._sizeGradients && this._sizeGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._sizeGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentSizeGradient) {\n particle._currentSize1 = particle._currentSize2;\n particle._currentSize2 = nextGradient.getFactor();\n particle._currentSizeGradient = currentGradient;\n }\n particle.size = Lerp(particle._currentSize1, particle._currentSize2, scale);\n });\n }\n // Remap data\n if (this._useRampGradients) {\n if (this._colorRemapGradients && this._colorRemapGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._colorRemapGradients, (currentGradient, nextGradient, scale) => {\n const min = Lerp(currentGradient.factor1, nextGradient.factor1, scale);\n const max = Lerp(currentGradient.factor2, nextGradient.factor2, scale);\n particle.remapData.x = min;\n particle.remapData.y = max - min;\n });\n }\n if (this._alphaRemapGradients && this._alphaRemapGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._alphaRemapGradients, (currentGradient, nextGradient, scale) => {\n const min = Lerp(currentGradient.factor1, nextGradient.factor1, scale);\n const max = Lerp(currentGradient.factor2, nextGradient.factor2, scale);\n particle.remapData.z = min;\n particle.remapData.w = max - min;\n });\n }\n }\n if (this._isAnimationSheetEnabled) {\n particle.updateCellIndex();\n }\n // Update the position of the attached sub-emitters to match their attached particle\n particle._inheritParticleInfoToSubEmitters();\n if (particle.age >= particle.lifeTime) {\n // Recycle by swapping with last particle\n this._emitFromParticle(particle);\n if (particle._attachedSubEmitters) {\n particle._attachedSubEmitters.forEach(subEmitter => {\n subEmitter.particleSystem.disposeOnStop = true;\n subEmitter.particleSystem.stop();\n });\n particle._attachedSubEmitters = null;\n }\n this.recycleParticle(particle);\n if (sameParticleArray) {\n index--;\n }\n continue;\n }\n }\n };\n }\n serialize(serializeTexture) {\n throw new Error(\"Method not implemented.\");\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 */\n clone(name, newEmitter, cloneTexture = false) {\n throw new Error(\"Method not implemented.\");\n }\n _addFactorGradient(factorGradients, gradient, factor, factor2) {\n const newGradient = new FactorGradient(gradient, factor, factor2);\n factorGradients.push(newGradient);\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 _removeFactorGradient(factorGradients, gradient) {\n if (!factorGradients) {\n return;\n }\n let index = 0;\n for (const factorGradient of factorGradients) {\n if (factorGradient.gradient === gradient) {\n factorGradients.splice(index, 1);\n break;\n }\n index++;\n }\n }\n /**\n * Adds a new life time gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the life time factor to affect to the specified gradient\n * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addLifeTimeGradient(gradient, factor, factor2) {\n if (!this._lifeTimeGradients) {\n this._lifeTimeGradients = [];\n }\n this._addFactorGradient(this._lifeTimeGradients, gradient, factor, factor2);\n return this;\n }\n /**\n * Remove a specific life time gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeLifeTimeGradient(gradient) {\n this._removeFactorGradient(this._lifeTimeGradients, gradient);\n return this;\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addSizeGradient(gradient, factor, factor2) {\n if (!this._sizeGradients) {\n this._sizeGradients = [];\n }\n this._addFactorGradient(this._sizeGradients, gradient, factor, factor2);\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._removeFactorGradient(this._sizeGradients, gradient);\n return this;\n }\n /**\n * Adds a new color remap gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param min defines the color remap minimal range\n * @param max defines the color remap maximal range\n * @returns the current particle system\n */\n addColorRemapGradient(gradient, min, max) {\n if (!this._colorRemapGradients) {\n this._colorRemapGradients = [];\n }\n this._addFactorGradient(this._colorRemapGradients, gradient, min, max);\n return this;\n }\n /**\n * Remove a specific color remap gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeColorRemapGradient(gradient) {\n this._removeFactorGradient(this._colorRemapGradients, gradient);\n return this;\n }\n /**\n * Adds a new alpha remap gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param min defines the alpha remap minimal range\n * @param max defines the alpha remap maximal range\n * @returns the current particle system\n */\n addAlphaRemapGradient(gradient, min, max) {\n if (!this._alphaRemapGradients) {\n this._alphaRemapGradients = [];\n }\n this._addFactorGradient(this._alphaRemapGradients, gradient, min, max);\n return this;\n }\n /**\n * Remove a specific alpha remap gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeAlphaRemapGradient(gradient) {\n this._removeFactorGradient(this._alphaRemapGradients, gradient);\n return this;\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addAngularSpeedGradient(gradient, factor, factor2) {\n if (!this._angularSpeedGradients) {\n this._angularSpeedGradients = [];\n }\n this._addFactorGradient(this._angularSpeedGradients, gradient, factor, factor2);\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._removeFactorGradient(this._angularSpeedGradients, gradient);\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addVelocityGradient(gradient, factor, factor2) {\n if (!this._velocityGradients) {\n this._velocityGradients = [];\n }\n this._addFactorGradient(this._velocityGradients, gradient, factor, factor2);\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._removeFactorGradient(this._velocityGradients, gradient);\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addLimitVelocityGradient(gradient, factor, factor2) {\n if (!this._limitVelocityGradients) {\n this._limitVelocityGradients = [];\n }\n this._addFactorGradient(this._limitVelocityGradients, gradient, factor, factor2);\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._removeFactorGradient(this._limitVelocityGradients, gradient);\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addDragGradient(gradient, factor, factor2) {\n if (!this._dragGradients) {\n this._dragGradients = [];\n }\n this._addFactorGradient(this._dragGradients, gradient, factor, factor2);\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._removeFactorGradient(this._dragGradients, gradient);\n return this;\n }\n /**\n * Adds a new emit rate gradient (please note that this will only work if you set the targetStopDuration property)\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the emit rate value to affect to the specified gradient\n * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addEmitRateGradient(gradient, factor, factor2) {\n if (!this._emitRateGradients) {\n this._emitRateGradients = [];\n }\n this._addFactorGradient(this._emitRateGradients, gradient, factor, factor2);\n return this;\n }\n /**\n * Remove a specific emit rate gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeEmitRateGradient(gradient) {\n this._removeFactorGradient(this._emitRateGradients, gradient);\n return this;\n }\n /**\n * Adds a new start size gradient (please note that this will only work if you set the targetStopDuration property)\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the start size value to affect to the specified gradient\n * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addStartSizeGradient(gradient, factor, factor2) {\n if (!this._startSizeGradients) {\n this._startSizeGradients = [];\n }\n this._addFactorGradient(this._startSizeGradients, gradient, factor, factor2);\n return this;\n }\n /**\n * Remove a specific start size gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeStartSizeGradient(gradient) {\n this._removeFactorGradient(this._startSizeGradients, gradient);\n return this;\n }\n _createRampGradientTexture() {\n if (!this._rampGradients || !this._rampGradients.length || this._rampGradientsTexture || !this._scene) {\n return;\n }\n const data = new Uint8Array(this._rawTextureWidth * 4);\n const tmpColor = TmpColors.Color3[0];\n for (let x = 0; x < this._rawTextureWidth; x++) {\n const ratio = x / this._rawTextureWidth;\n GradientHelper.GetCurrentGradient(ratio, this._rampGradients, (currentGradient, nextGradient, scale) => {\n Color3.LerpToRef(currentGradient.color, nextGradient.color, 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] = 255;\n });\n }\n this._rampGradientsTexture = RawTexture.CreateRGBATexture(data, this._rawTextureWidth, 1, this._scene, false, false, 1);\n }\n /**\n * Gets the current list of ramp gradients.\n * You must use addRampGradient and removeRampGradient to update this list\n * @returns the list of ramp gradients\n */\n getRampGradients() {\n return this._rampGradients;\n }\n /** Force the system to rebuild all gradients that need to be resync */\n forceRefreshGradients() {\n this._syncRampGradientTexture();\n }\n _syncRampGradientTexture() {\n if (!this._rampGradients) {\n return;\n }\n this._rampGradients.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 if (this._rampGradientsTexture) {\n this._rampGradientsTexture.dispose();\n this._rampGradientsTexture = null;\n }\n this._createRampGradientTexture();\n }\n /**\n * Adds a new ramp gradient used to remap particle colors\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param color defines the color to affect to the specified gradient\n * @returns the current particle system\n */\n addRampGradient(gradient, color) {\n if (!this._rampGradients) {\n this._rampGradients = [];\n }\n const rampGradient = new Color3Gradient(gradient, color);\n this._rampGradients.push(rampGradient);\n this._syncRampGradientTexture();\n return this;\n }\n /**\n * Remove a specific ramp gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeRampGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._rampGradients, this._rampGradientsTexture);\n this._rampGradientsTexture = null;\n if (this._rampGradients && this._rampGradients.length > 0) {\n this._createRampGradientTexture();\n }\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 * @param color2 defines an additional color used to define a range ([color, color2]) with main color to pick the final color from\n * @returns this particle system\n */\n addColorGradient(gradient, color1, color2) {\n if (!this._colorGradients) {\n this._colorGradients = [];\n }\n const colorGradient = new ColorGradient(gradient, color1, color2);\n this._colorGradients.push(colorGradient);\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 return this;\n }\n /**\n * Remove a specific color gradient\n * @param gradient defines the gradient to remove\n * @returns this particle system\n */\n removeColorGradient(gradient) {\n if (!this._colorGradients) {\n return this;\n }\n let index = 0;\n for (const colorGradient of this._colorGradients) {\n if (colorGradient.gradient === gradient) {\n this._colorGradients.splice(index, 1);\n break;\n }\n index++;\n }\n return this;\n }\n /**\n * Resets the draw wrappers cache\n */\n resetDrawCache() {\n for (const drawWrappers of this._drawWrappers) {\n if (drawWrappers) {\n for (const drawWrapper of drawWrappers) {\n drawWrapper === null || drawWrapper === void 0 || drawWrapper.dispose();\n }\n }\n }\n this._drawWrappers = [];\n }\n _fetchR(u, v, width, height, pixels) {\n u = Math.abs(u) * 0.5 + 0.5;\n v = Math.abs(v) * 0.5 + 0.5;\n const wrappedU = u * width % width | 0;\n const wrappedV = v * height % height | 0;\n const position = (wrappedU + wrappedV * width) * 4;\n return pixels[position] / 255;\n }\n _reset() {\n this._resetEffect();\n }\n _resetEffect() {\n if (this._vertexBuffer) {\n this._vertexBuffer.dispose();\n this._vertexBuffer = null;\n }\n if (this._spriteBuffer) {\n this._spriteBuffer.dispose();\n this._spriteBuffer = null;\n }\n if (this._vertexArrayObject) {\n this._engine.releaseVertexArrayObject(this._vertexArrayObject);\n this._vertexArrayObject = null;\n }\n this._createVertexBuffers();\n }\n _createVertexBuffers() {\n this._vertexBufferSize = this._useInstancing ? 10 : 12;\n if (this._isAnimationSheetEnabled) {\n this._vertexBufferSize += 1;\n }\n if (!this._isBillboardBased || this.billboardMode === 8 || this.billboardMode === 9) {\n this._vertexBufferSize += 3;\n }\n if (this._useRampGradients) {\n this._vertexBufferSize += 4;\n }\n const engine = this._engine;\n const vertexSize = this._vertexBufferSize * (this._useInstancing ? 1 : 4);\n this._vertexData = new Float32Array(this._capacity * vertexSize);\n this._vertexBuffer = new Buffer(engine, this._vertexData, true, vertexSize);\n let dataOffset = 0;\n const positions = this._vertexBuffer.createVertexBuffer(VertexBuffer.PositionKind, dataOffset, 3, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[VertexBuffer.PositionKind] = positions;\n dataOffset += 3;\n const colors = this._vertexBuffer.createVertexBuffer(VertexBuffer.ColorKind, dataOffset, 4, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[VertexBuffer.ColorKind] = colors;\n dataOffset += 4;\n const options = this._vertexBuffer.createVertexBuffer(\"angle\", dataOffset, 1, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"angle\"] = options;\n dataOffset += 1;\n const size = this._vertexBuffer.createVertexBuffer(\"size\", dataOffset, 2, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"size\"] = size;\n dataOffset += 2;\n if (this._isAnimationSheetEnabled) {\n const cellIndexBuffer = this._vertexBuffer.createVertexBuffer(\"cellIndex\", dataOffset, 1, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"cellIndex\"] = cellIndexBuffer;\n dataOffset += 1;\n }\n if (!this._isBillboardBased || this.billboardMode === 8 || this.billboardMode === 9) {\n const directionBuffer = this._vertexBuffer.createVertexBuffer(\"direction\", dataOffset, 3, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"direction\"] = directionBuffer;\n dataOffset += 3;\n }\n if (this._useRampGradients) {\n const rampDataBuffer = this._vertexBuffer.createVertexBuffer(\"remapData\", dataOffset, 4, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"remapData\"] = rampDataBuffer;\n dataOffset += 4;\n }\n let offsets;\n if (this._useInstancing) {\n const spriteData = new Float32Array([0, 0, 1, 0, 0, 1, 1, 1]);\n this._spriteBuffer = new Buffer(engine, spriteData, false, 2);\n offsets = this._spriteBuffer.createVertexBuffer(\"offset\", 0, 2);\n } else {\n offsets = this._vertexBuffer.createVertexBuffer(\"offset\", dataOffset, 2, this._vertexBufferSize, this._useInstancing);\n dataOffset += 2;\n }\n this._vertexBuffers[\"offset\"] = offsets;\n this.resetDrawCache();\n }\n _createIndexBuffer() {\n if (this._useInstancing) {\n this._linesIndexBufferUseInstancing = this._engine.createIndexBuffer(new Uint32Array([0, 1, 1, 3, 3, 2, 2, 0, 0, 3]));\n return;\n }\n const indices = [];\n const indicesWireframe = [];\n let index = 0;\n for (let count = 0; count < this._capacity; count++) {\n indices.push(index);\n indices.push(index + 1);\n indices.push(index + 2);\n indices.push(index);\n indices.push(index + 2);\n indices.push(index + 3);\n indicesWireframe.push(index, index + 1, index + 1, index + 2, index + 2, index + 3, index + 3, index, index, index + 3);\n index += 4;\n }\n this._indexBuffer = this._engine.createIndexBuffer(indices);\n this._linesIndexBuffer = this._engine.createIndexBuffer(indicesWireframe);\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 whether there are still active particles in the system.\n * @returns True if it is alive, otherwise false.\n */\n isAlive() {\n return this._alive;\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 /** @internal */\n _preStart() {\n // Do nothing\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._actualFrame = 0;\n this._preStart();\n // Reset emit gradient so it acts the same on every start\n if (this._emitRateGradients) {\n if (this._emitRateGradients.length > 0) {\n this._currentEmitRateGradient = this._emitRateGradients[0];\n this._currentEmitRate1 = this._currentEmitRateGradient.getFactor();\n this._currentEmitRate2 = this._currentEmitRate1;\n }\n if (this._emitRateGradients.length > 1) {\n this._currentEmitRate2 = this._emitRateGradients[1].getFactor();\n }\n }\n // Reset start size gradient so it acts the same on every start\n if (this._startSizeGradients) {\n if (this._startSizeGradients.length > 0) {\n this._currentStartSizeGradient = this._startSizeGradients[0];\n this._currentStartSize1 = this._currentStartSizeGradient.getFactor();\n this._currentStartSize2 = this._currentStartSize1;\n }\n if (this._startSizeGradients.length > 1) {\n this._currentStartSize2 = this._startSizeGradients[1].getFactor();\n }\n }\n if (this.preWarmCycles) {\n var _this$emitter;\n if (((_this$emitter = this.emitter) === null || _this$emitter === void 0 ? void 0 : _this$emitter.getClassName().indexOf(\"Mesh\")) !== -1) {\n this.emitter.computeWorldMatrix(true);\n }\n const noiseTextureAsProcedural = this.noiseTexture;\n if (noiseTextureAsProcedural && noiseTextureAsProcedural.onGeneratedObservable) {\n noiseTextureAsProcedural.onGeneratedObservable.addOnce(() => {\n setTimeout(() => {\n for (let index = 0; index < this.preWarmCycles; index++) {\n this.animate(true);\n noiseTextureAsProcedural.render();\n }\n });\n });\n } else {\n for (let index = 0; index < this.preWarmCycles; index++) {\n this.animate(true);\n }\n }\n }\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 * @param stopSubEmitters if true it will stop the current system and all created sub-Systems if false it will stop the current root system only, this param is used by the root particle system only. The default value is true.\n */\n stop(stopSubEmitters = true) {\n if (this._stopped) {\n return;\n }\n this.onStoppedObservable.notifyObservers(this);\n this._stopped = true;\n this._postStop(stopSubEmitters);\n }\n /** @internal */\n _postStop(stopSubEmitters) {\n // Do nothing\n }\n // Animation sheet\n /**\n * Remove all active particles\n */\n reset() {\n this._stockParticles.length = 0;\n this._particles.length = 0;\n }\n /**\n * @internal (for internal use only)\n */\n _appendParticleVertex(index, particle, offsetX, offsetY) {\n let offset = index * this._vertexBufferSize;\n this._vertexData[offset++] = particle.position.x + this.worldOffset.x;\n this._vertexData[offset++] = particle.position.y + this.worldOffset.y;\n this._vertexData[offset++] = particle.position.z + this.worldOffset.z;\n this._vertexData[offset++] = particle.color.r;\n this._vertexData[offset++] = particle.color.g;\n this._vertexData[offset++] = particle.color.b;\n this._vertexData[offset++] = particle.color.a;\n this._vertexData[offset++] = particle.angle;\n this._vertexData[offset++] = particle.scale.x * particle.size;\n this._vertexData[offset++] = particle.scale.y * particle.size;\n if (this._isAnimationSheetEnabled) {\n this._vertexData[offset++] = particle.cellIndex;\n }\n if (!this._isBillboardBased) {\n if (particle._initialDirection) {\n let initialDirection = particle._initialDirection;\n if (this.isLocal) {\n Vector3.TransformNormalToRef(initialDirection, this._emitterWorldMatrix, TmpVectors.Vector3[0]);\n initialDirection = TmpVectors.Vector3[0];\n }\n if (initialDirection.x === 0 && initialDirection.z === 0) {\n initialDirection.x = 0.001;\n }\n this._vertexData[offset++] = initialDirection.x;\n this._vertexData[offset++] = initialDirection.y;\n this._vertexData[offset++] = initialDirection.z;\n } else {\n let direction = particle.direction;\n if (this.isLocal) {\n Vector3.TransformNormalToRef(direction, this._emitterWorldMatrix, TmpVectors.Vector3[0]);\n direction = TmpVectors.Vector3[0];\n }\n if (direction.x === 0 && direction.z === 0) {\n direction.x = 0.001;\n }\n this._vertexData[offset++] = direction.x;\n this._vertexData[offset++] = direction.y;\n this._vertexData[offset++] = direction.z;\n }\n } else if (this.billboardMode === 8 || this.billboardMode === 9) {\n this._vertexData[offset++] = particle.direction.x;\n this._vertexData[offset++] = particle.direction.y;\n this._vertexData[offset++] = particle.direction.z;\n }\n if (this._useRampGradients && particle.remapData) {\n this._vertexData[offset++] = particle.remapData.x;\n this._vertexData[offset++] = particle.remapData.y;\n this._vertexData[offset++] = particle.remapData.z;\n this._vertexData[offset++] = particle.remapData.w;\n }\n if (!this._useInstancing) {\n if (this._isAnimationSheetEnabled) {\n if (offsetX === 0) {\n offsetX = this._epsilon;\n } else if (offsetX === 1) {\n offsetX = 1 - this._epsilon;\n }\n if (offsetY === 0) {\n offsetY = this._epsilon;\n } else if (offsetY === 1) {\n offsetY = 1 - this._epsilon;\n }\n }\n this._vertexData[offset++] = offsetX;\n this._vertexData[offset++] = offsetY;\n }\n }\n /** @internal */\n _prepareParticle(particle) {\n //Do nothing\n }\n _update(newParticles) {\n // Update current\n this._alive = this._particles.length > 0;\n if (this.emitter.position) {\n const emitterMesh = this.emitter;\n this._emitterWorldMatrix = emitterMesh.getWorldMatrix();\n } else {\n const emitterPosition = this.emitter;\n this._emitterWorldMatrix = Matrix.Translation(emitterPosition.x, emitterPosition.y, emitterPosition.z);\n }\n this._emitterWorldMatrix.invertToRef(this._emitterInverseWorldMatrix);\n this.updateFunction(this._particles);\n // Add new ones\n let particle;\n for (let index = 0; index < newParticles; index++) {\n if (this._particles.length === this._capacity) {\n break;\n }\n particle = this._createParticle();\n this._particles.push(particle);\n // Life time\n if (this.targetStopDuration && this._lifeTimeGradients && this._lifeTimeGradients.length > 0) {\n const ratio = Clamp(this._actualFrame / this.targetStopDuration);\n GradientHelper.GetCurrentGradient(ratio, this._lifeTimeGradients, (currentGradient, nextGradient) => {\n const factorGradient1 = currentGradient;\n const factorGradient2 = nextGradient;\n const lifeTime1 = factorGradient1.getFactor();\n const lifeTime2 = factorGradient2.getFactor();\n const gradient = (ratio - factorGradient1.gradient) / (factorGradient2.gradient - factorGradient1.gradient);\n particle.lifeTime = Lerp(lifeTime1, lifeTime2, gradient);\n });\n } else {\n particle.lifeTime = RandomRange(this.minLifeTime, this.maxLifeTime);\n }\n // Emitter\n const emitPower = RandomRange(this.minEmitPower, this.maxEmitPower);\n if (this.startPositionFunction) {\n this.startPositionFunction(this._emitterWorldMatrix, particle.position, particle, this.isLocal);\n } else {\n this.particleEmitterType.startPositionFunction(this._emitterWorldMatrix, particle.position, particle, this.isLocal);\n }\n if (this.isLocal) {\n if (!particle._localPosition) {\n particle._localPosition = particle.position.clone();\n } else {\n particle._localPosition.copyFrom(particle.position);\n }\n Vector3.TransformCoordinatesToRef(particle._localPosition, this._emitterWorldMatrix, particle.position);\n }\n if (this.startDirectionFunction) {\n this.startDirectionFunction(this._emitterWorldMatrix, particle.direction, particle, this.isLocal);\n } else {\n this.particleEmitterType.startDirectionFunction(this._emitterWorldMatrix, particle.direction, particle, this.isLocal, this._emitterInverseWorldMatrix);\n }\n if (emitPower === 0) {\n if (!particle._initialDirection) {\n particle._initialDirection = particle.direction.clone();\n } else {\n particle._initialDirection.copyFrom(particle.direction);\n }\n } else {\n particle._initialDirection = null;\n }\n particle.direction.scaleInPlace(emitPower);\n // Size\n if (!this._sizeGradients || this._sizeGradients.length === 0) {\n particle.size = RandomRange(this.minSize, this.maxSize);\n } else {\n particle._currentSizeGradient = this._sizeGradients[0];\n particle._currentSize1 = particle._currentSizeGradient.getFactor();\n particle.size = particle._currentSize1;\n if (this._sizeGradients.length > 1) {\n particle._currentSize2 = this._sizeGradients[1].getFactor();\n } else {\n particle._currentSize2 = particle._currentSize1;\n }\n }\n // Size and scale\n particle.scale.copyFromFloats(RandomRange(this.minScaleX, this.maxScaleX), RandomRange(this.minScaleY, this.maxScaleY));\n // Adjust scale by start size\n if (this._startSizeGradients && this._startSizeGradients[0] && this.targetStopDuration) {\n const ratio = this._actualFrame / this.targetStopDuration;\n GradientHelper.GetCurrentGradient(ratio, this._startSizeGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== this._currentStartSizeGradient) {\n this._currentStartSize1 = this._currentStartSize2;\n this._currentStartSize2 = nextGradient.getFactor();\n this._currentStartSizeGradient = currentGradient;\n }\n const value = Lerp(this._currentStartSize1, this._currentStartSize2, scale);\n particle.scale.scaleInPlace(value);\n });\n }\n // Angle\n if (!this._angularSpeedGradients || this._angularSpeedGradients.length === 0) {\n particle.angularSpeed = RandomRange(this.minAngularSpeed, this.maxAngularSpeed);\n } else {\n particle._currentAngularSpeedGradient = this._angularSpeedGradients[0];\n particle.angularSpeed = particle._currentAngularSpeedGradient.getFactor();\n particle._currentAngularSpeed1 = particle.angularSpeed;\n if (this._angularSpeedGradients.length > 1) {\n particle._currentAngularSpeed2 = this._angularSpeedGradients[1].getFactor();\n } else {\n particle._currentAngularSpeed2 = particle._currentAngularSpeed1;\n }\n }\n particle.angle = RandomRange(this.minInitialRotation, this.maxInitialRotation);\n // Velocity\n if (this._velocityGradients && this._velocityGradients.length > 0) {\n particle._currentVelocityGradient = this._velocityGradients[0];\n particle._currentVelocity1 = particle._currentVelocityGradient.getFactor();\n if (this._velocityGradients.length > 1) {\n particle._currentVelocity2 = this._velocityGradients[1].getFactor();\n } else {\n particle._currentVelocity2 = particle._currentVelocity1;\n }\n }\n // Limit velocity\n if (this._limitVelocityGradients && this._limitVelocityGradients.length > 0) {\n particle._currentLimitVelocityGradient = this._limitVelocityGradients[0];\n particle._currentLimitVelocity1 = particle._currentLimitVelocityGradient.getFactor();\n if (this._limitVelocityGradients.length > 1) {\n particle._currentLimitVelocity2 = this._limitVelocityGradients[1].getFactor();\n } else {\n particle._currentLimitVelocity2 = particle._currentLimitVelocity1;\n }\n }\n // Drag\n if (this._dragGradients && this._dragGradients.length > 0) {\n particle._currentDragGradient = this._dragGradients[0];\n particle._currentDrag1 = particle._currentDragGradient.getFactor();\n if (this._dragGradients.length > 1) {\n particle._currentDrag2 = this._dragGradients[1].getFactor();\n } else {\n particle._currentDrag2 = particle._currentDrag1;\n }\n }\n // Color\n if (!this._colorGradients || this._colorGradients.length === 0) {\n const step = RandomRange(0, 1.0);\n Color4.LerpToRef(this.color1, this.color2, step, particle.color);\n this.colorDead.subtractToRef(particle.color, this._colorDiff);\n this._colorDiff.scaleToRef(1.0 / particle.lifeTime, particle.colorStep);\n } else {\n particle._currentColorGradient = this._colorGradients[0];\n particle._currentColorGradient.getColorToRef(particle.color);\n particle._currentColor1.copyFrom(particle.color);\n if (this._colorGradients.length > 1) {\n this._colorGradients[1].getColorToRef(particle._currentColor2);\n } else {\n particle._currentColor2.copyFrom(particle.color);\n }\n }\n // Sheet\n if (this._isAnimationSheetEnabled) {\n particle._initialStartSpriteCellID = this.startSpriteCellID;\n particle._initialEndSpriteCellID = this.endSpriteCellID;\n particle._initialSpriteCellLoop = this.spriteCellLoop;\n }\n // Inherited Velocity\n particle.direction.addInPlace(this._inheritedVelocityOffset);\n // Ramp\n if (this._useRampGradients) {\n particle.remapData = new Vector4(0, 1, 0, 1);\n }\n // Noise texture coordinates\n if (this.noiseTexture) {\n if (particle._randomNoiseCoordinates1) {\n particle._randomNoiseCoordinates1.copyFromFloats(Math.random(), Math.random(), Math.random());\n particle._randomNoiseCoordinates2.copyFromFloats(Math.random(), Math.random(), Math.random());\n } else {\n particle._randomNoiseCoordinates1 = new Vector3(Math.random(), Math.random(), Math.random());\n particle._randomNoiseCoordinates2 = new Vector3(Math.random(), Math.random(), Math.random());\n }\n }\n // Update the position of the attached sub-emitters to match their attached particle\n particle._inheritParticleInfoToSubEmitters();\n }\n }\n /**\n * @internal\n */\n static _GetAttributeNamesOrOptions(isAnimationSheetEnabled = false, isBillboardBased = false, useRampGradients = false) {\n const attributeNamesOrOptions = [VertexBuffer.PositionKind, VertexBuffer.ColorKind, \"angle\", \"offset\", \"size\"];\n if (isAnimationSheetEnabled) {\n attributeNamesOrOptions.push(\"cellIndex\");\n }\n if (!isBillboardBased) {\n attributeNamesOrOptions.push(\"direction\");\n }\n if (useRampGradients) {\n attributeNamesOrOptions.push(\"remapData\");\n }\n return attributeNamesOrOptions;\n }\n /**\n * @internal\n */\n static _GetEffectCreationOptions(isAnimationSheetEnabled = false, useLogarithmicDepth = false, applyFog = false) {\n const effectCreationOption = [\"invView\", \"view\", \"projection\", \"textureMask\", \"translationPivot\", \"eyePosition\"];\n addClipPlaneUniforms(effectCreationOption);\n if (isAnimationSheetEnabled) {\n effectCreationOption.push(\"particlesInfos\");\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, fillImageProcessing = true) {\n if (this._scene) {\n prepareStringDefinesForClipPlanes(this, this._scene, defines);\n if (this.applyFog && this._scene.fogEnabled && this._scene.fogMode !== 0) {\n defines.push(\"#define FOG\");\n }\n }\n if (this._isAnimationSheetEnabled) {\n defines.push(\"#define ANIMATESHEET\");\n }\n if (this.useLogarithmicDepth) {\n defines.push(\"#define LOGARITHMICDEPTH\");\n }\n if (blendMode === BaseParticleSystem.BLENDMODE_MULTIPLY) {\n defines.push(\"#define BLENDMULTIPLYMODE\");\n }\n if (this._useRampGradients) {\n defines.push(\"#define RAMPGRADIENT\");\n }\n if (this._isBillboardBased) {\n defines.push(\"#define BILLBOARD\");\n switch (this.billboardMode) {\n case 2:\n defines.push(\"#define BILLBOARDY\");\n break;\n case 8:\n case 9:\n defines.push(\"#define BILLBOARDSTRETCHED\");\n if (this.billboardMode === 9) {\n defines.push(\"#define BILLBOARDSTRETCHED_LOCAL\");\n }\n break;\n case 7:\n defines.push(\"#define BILLBOARDMODE_ALL\");\n break;\n default:\n break;\n }\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(...ThinParticleSystem._GetAttributeNamesOrOptions(this._isAnimationSheetEnabled, this._isBillboardBased && this.billboardMode !== 8 && this.billboardMode !== 9, this._useRampGradients));\n uniforms.push(...ThinParticleSystem._GetEffectCreationOptions(this._isAnimationSheetEnabled, this.useLogarithmicDepth, this.applyFog));\n samplers.push(\"diffuseSampler\", \"rampSampler\");\n if (this._imageProcessingConfiguration) {\n PrepareUniformsForImageProcessing(uniforms, this._imageProcessingConfigurationDefines);\n PrepareSamplersForImageProcessing(samplers, this._imageProcessingConfigurationDefines);\n }\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 const currentRenderPassId = this._engine._features.supportRenderPasses ? this._engine.currentRenderPassId : 0;\n let drawWrappers = this._drawWrappers[currentRenderPassId];\n if (!drawWrappers) {\n drawWrappers = this._drawWrappers[currentRenderPassId] = [];\n }\n let drawWrapper = drawWrappers[blendMode];\n if (!drawWrapper) {\n drawWrapper = new DrawWrapper(this._engine);\n if (drawWrapper.drawContext) {\n drawWrapper.drawContext.useInstancing = this._useInstancing;\n }\n drawWrappers[blendMode] = drawWrapper;\n }\n const join = defines.join(\"\\n\");\n if (drawWrapper.defines !== join) {\n const attributesNamesOrOptions = [];\n const effectCreationOption = [];\n const samplers = [];\n this.fillUniformsAttributesAndSamplerNames(effectCreationOption, attributesNamesOrOptions, samplers);\n drawWrapper.setEffect(this._engine.createEffect(\"particles\", attributesNamesOrOptions, effectCreationOption, samplers, join, undefined, undefined, undefined, undefined, this._shaderLanguage), join);\n }\n return drawWrapper;\n }\n /**\n * Animates the particle system for the current frame by emitting new particles and or animating the living ones.\n * @param preWarmOnly will prevent the system from updating the vertex buffer (default is false)\n */\n animate(preWarmOnly = false) {\n var _this$_scene;\n if (!this._started) {\n return;\n }\n if (!preWarmOnly && this._scene) {\n // Check\n if (!this.isReady()) {\n return;\n }\n if (this._currentRenderId === this._scene.getFrameId()) {\n return;\n }\n this._currentRenderId = this._scene.getFrameId();\n }\n this._scaledUpdateSpeed = this.updateSpeed * (preWarmOnly ? this.preWarmStepOffset : ((_this$_scene = this._scene) === null || _this$_scene === void 0 ? void 0 : _this$_scene.getAnimationRatio()) || 1);\n // Determine the number of particles we need to create\n let newParticles;\n if (this.manualEmitCount > -1) {\n newParticles = this.manualEmitCount;\n this._newPartsExcess = 0;\n this.manualEmitCount = 0;\n } else {\n let rate = this.emitRate;\n if (this._emitRateGradients && this._emitRateGradients.length > 0 && this.targetStopDuration) {\n const ratio = this._actualFrame / this.targetStopDuration;\n GradientHelper.GetCurrentGradient(ratio, this._emitRateGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== this._currentEmitRateGradient) {\n this._currentEmitRate1 = this._currentEmitRate2;\n this._currentEmitRate2 = nextGradient.getFactor();\n this._currentEmitRateGradient = currentGradient;\n }\n rate = Lerp(this._currentEmitRate1, this._currentEmitRate2, scale);\n });\n }\n newParticles = rate * this._scaledUpdateSpeed >> 0;\n this._newPartsExcess += rate * this._scaledUpdateSpeed - newParticles;\n }\n if (this._newPartsExcess > 1.0) {\n newParticles += this._newPartsExcess >> 0;\n this._newPartsExcess -= this._newPartsExcess >> 0;\n }\n this._alive = false;\n if (!this._stopped) {\n this._actualFrame += this._scaledUpdateSpeed;\n if (this.targetStopDuration && this._actualFrame >= this.targetStopDuration) {\n this.stop();\n }\n } else {\n newParticles = 0;\n }\n this._update(newParticles);\n // Stopped?\n if (this._stopped) {\n if (!this._alive) {\n this._started = false;\n if (this.onAnimationEnd) {\n this.onAnimationEnd();\n }\n if (this.disposeOnStop && this._scene) {\n this._scene._toBeDisposed.push(this);\n }\n }\n }\n if (!preWarmOnly) {\n // Update VBO\n let offset = 0;\n for (let index = 0; index < this._particles.length; index++) {\n const particle = this._particles[index];\n this._appendParticleVertices(offset, particle);\n offset += this._useInstancing ? 1 : 4;\n }\n if (this._vertexBuffer) {\n this._vertexBuffer.updateDirectly(this._vertexData, 0, this._particles.length);\n }\n }\n if (this.manualEmitCount === 0 && this.disposeOnStop) {\n this.stop();\n }\n }\n _appendParticleVertices(offset, particle) {\n this._appendParticleVertex(offset++, particle, 0, 0);\n if (!this._useInstancing) {\n this._appendParticleVertex(offset++, particle, 1, 0);\n this._appendParticleVertex(offset++, particle, 1, 1);\n this._appendParticleVertex(offset++, particle, 0, 1);\n }\n }\n /**\n * Rebuilds the particle system.\n */\n rebuild() {\n var _this$_spriteBuffer;\n if (this._engine.getCaps().vertexArrayObject) {\n this._vertexArrayObject = null;\n }\n this._createIndexBuffer();\n (_this$_spriteBuffer = this._spriteBuffer) === null || _this$_spriteBuffer === void 0 || _this$_spriteBuffer._rebuild();\n this._createVertexBuffers();\n this.resetDrawCache();\n }\n _initShaderSourceAsync() {\n var _this = this;\n return _asyncToGenerator(function* () {\n const engine = _this._engine;\n if (engine.isWebGPU && !ThinParticleSystem.ForceGLSL) {\n _this._shaderLanguage = 1 /* ShaderLanguage.WGSL */;\n yield Promise.all([import(\"../ShadersWGSL/particles.vertex.js\"), import(\"../ShadersWGSL/particles.fragment.js\")]);\n } else {\n yield Promise.all([import(\"../Shaders/particles.vertex.js\"), import(\"../Shaders/particles.fragment.js\")]);\n }\n _this._shadersLoaded = true;\n })();\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._shadersLoaded) {\n return false;\n }\n if (!this.emitter || this._imageProcessingConfiguration && !this._imageProcessingConfiguration.isReady() || !this.particleTexture || !this.particleTexture.isReady()) {\n return false;\n }\n if (this.blendMode !== BaseParticleSystem.BLENDMODE_MULTIPLYADD) {\n if (!this._getWrapper(this.blendMode).effect.isReady()) {\n return false;\n }\n } else {\n if (!this._getWrapper(BaseParticleSystem.BLENDMODE_MULTIPLY).effect.isReady()) {\n return false;\n }\n if (!this._getWrapper(BaseParticleSystem.BLENDMODE_ADD).effect.isReady()) {\n return false;\n }\n }\n return true;\n }\n _render(blendMode) {\n var _this$defaultViewMatr, _this$defaultProjecti;\n const drawWrapper = this._getWrapper(blendMode);\n const effect = drawWrapper.effect;\n const engine = this._engine;\n // Render\n engine.enableEffect(drawWrapper);\n const viewMatrix = (_this$defaultViewMatr = this.defaultViewMatrix) !== null && _this$defaultViewMatr !== void 0 ? _this$defaultViewMatr : this._scene.getViewMatrix();\n effect.setTexture(\"diffuseSampler\", this.particleTexture);\n effect.setMatrix(\"view\", viewMatrix);\n effect.setMatrix(\"projection\", (_this$defaultProjecti = this.defaultProjectionMatrix) !== null && _this$defaultProjecti !== void 0 ? _this$defaultProjecti : this._scene.getProjectionMatrix());\n if (this._isAnimationSheetEnabled && this.particleTexture) {\n const baseSize = this.particleTexture.getBaseSize();\n effect.setFloat3(\"particlesInfos\", this.spriteCellWidth / baseSize.width, this.spriteCellHeight / baseSize.height, this.spriteCellWidth / baseSize.width);\n }\n effect.setVector2(\"translationPivot\", this.translationPivot);\n effect.setFloat4(\"textureMask\", this.textureMask.r, this.textureMask.g, this.textureMask.b, this.textureMask.a);\n if (this._isBillboardBased && this._scene) {\n const camera = this._scene.activeCamera;\n effect.setVector3(\"eyePosition\", camera.globalPosition);\n }\n if (this._rampGradientsTexture) {\n if (!this._rampGradients || !this._rampGradients.length) {\n this._rampGradientsTexture.dispose();\n this._rampGradientsTexture = null;\n }\n effect.setTexture(\"rampSampler\", this._rampGradientsTexture);\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 viewMatrix.invertToRef(TmpVectors.Matrix[0]);\n effect.setMatrix(\"invView\", TmpVectors.Matrix[0]);\n }\n if (this._vertexArrayObject !== undefined) {\n var _this$_scene2;\n if ((_this$_scene2 = this._scene) !== null && _this$_scene2 !== void 0 && _this$_scene2.forceWireframe) {\n engine.bindBuffers(this._vertexBuffers, this._linesIndexBufferUseInstancing, effect);\n } else {\n var _this$_scene3;\n if (!this._vertexArrayObject) {\n this._vertexArrayObject = this._engine.recordVertexArrayObject(this._vertexBuffers, null, effect);\n }\n this._engine.bindVertexArrayObject(this._vertexArrayObject, (_this$_scene3 = this._scene) !== null && _this$_scene3 !== void 0 && _this$_scene3.forceWireframe ? this._linesIndexBufferUseInstancing : this._indexBuffer);\n }\n } else {\n if (!this._indexBuffer) {\n var _this$_scene4;\n // Use instancing mode\n engine.bindBuffers(this._vertexBuffers, (_this$_scene4 = this._scene) !== null && _this$_scene4 !== void 0 && _this$_scene4.forceWireframe ? this._linesIndexBufferUseInstancing : null, effect);\n } else {\n var _this$_scene5;\n engine.bindBuffers(this._vertexBuffers, (_this$_scene5 = this._scene) !== null && _this$_scene5 !== void 0 && _this$_scene5.forceWireframe ? this._linesIndexBuffer : this._indexBuffer, effect);\n }\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 BaseParticleSystem.BLENDMODE_ADD:\n engine.setAlphaMode(1);\n break;\n case BaseParticleSystem.BLENDMODE_ONEONE:\n engine.setAlphaMode(6);\n break;\n case BaseParticleSystem.BLENDMODE_STANDARD:\n engine.setAlphaMode(2);\n break;\n case BaseParticleSystem.BLENDMODE_MULTIPLY:\n engine.setAlphaMode(4);\n break;\n }\n if (this._onBeforeDrawParticlesObservable) {\n this._onBeforeDrawParticlesObservable.notifyObservers(effect);\n }\n if (this._useInstancing) {\n var _this$_scene6;\n if ((_this$_scene6 = this._scene) !== null && _this$_scene6 !== void 0 && _this$_scene6.forceWireframe) {\n engine.drawElementsType(6, 0, 10, this._particles.length);\n } else {\n engine.drawArraysType(7, 0, 4, this._particles.length);\n }\n } else {\n var _this$_scene7;\n if ((_this$_scene7 = this._scene) !== null && _this$_scene7 !== void 0 && _this$_scene7.forceWireframe) {\n engine.drawElementsType(1, 0, this._particles.length * 10);\n } else {\n engine.drawElementsType(0, 0, this._particles.length * 6);\n }\n }\n return this._particles.length;\n }\n /**\n * Renders the particle system in its current state.\n * @returns the current number of particles\n */\n render() {\n // Check\n if (!this.isReady() || !this._particles.length) {\n return 0;\n }\n const engine = this._engine;\n if (engine.setState) {\n engine.setState(false);\n if (this.forceDepthWrite) {\n engine.setDepthWrite(true);\n }\n }\n let outparticles = 0;\n if (this.blendMode === BaseParticleSystem.BLENDMODE_MULTIPLYADD) {\n outparticles = this._render(BaseParticleSystem.BLENDMODE_MULTIPLY) + this._render(BaseParticleSystem.BLENDMODE_ADD);\n } else {\n outparticles = this._render(this.blendMode);\n }\n this._engine.unbindInstanceAttributes();\n this._engine.setAlphaMode(0);\n return outparticles;\n }\n /** @internal */\n _onDispose(disposeAttachedSubEmitters = false, disposeEndSubEmitters = false) {\n // Do Nothing\n }\n /**\n * Disposes the particle system and free the associated resources\n * @param disposeTexture defines if the particle texture must be disposed as well (true by default)\n * @param disposeAttachedSubEmitters defines if the attached sub-emitters must be disposed as well (false by default)\n * @param disposeEndSubEmitters defines if the end type sub-emitters must be disposed as well (false by default)\n */\n dispose(disposeTexture = true, disposeAttachedSubEmitters = false, disposeEndSubEmitters = false) {\n this.resetDrawCache();\n if (this._vertexBuffer) {\n this._vertexBuffer.dispose();\n this._vertexBuffer = null;\n }\n if (this._spriteBuffer) {\n this._spriteBuffer.dispose();\n this._spriteBuffer = null;\n }\n if (this._indexBuffer) {\n this._engine._releaseBuffer(this._indexBuffer);\n this._indexBuffer = null;\n }\n if (this._linesIndexBuffer) {\n this._engine._releaseBuffer(this._linesIndexBuffer);\n this._linesIndexBuffer = null;\n }\n if (this._linesIndexBufferUseInstancing) {\n this._engine._releaseBuffer(this._linesIndexBufferUseInstancing);\n this._linesIndexBufferUseInstancing = null;\n }\n if (this._vertexArrayObject) {\n this._engine.releaseVertexArrayObject(this._vertexArrayObject);\n this._vertexArrayObject = 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 if (this._rampGradientsTexture) {\n this._rampGradientsTexture.dispose();\n this._rampGradientsTexture = null;\n }\n this._onDispose(disposeAttachedSubEmitters, disposeEndSubEmitters);\n if (this._onBeforeDrawParticlesObservable) {\n this._onBeforeDrawParticlesObservable.clear();\n }\n // Remove from scene\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 this._scene._activeParticleSystems.dispose();\n }\n // Callback\n this.onDisposeObservable.notifyObservers(this);\n this.onDisposeObservable.clear();\n this.onStoppedObservable.clear();\n this.reset();\n }\n}\n/**\n * Force all the particle systems to compile to glsl even on WebGPU engines.\n * False by default. This is mostly meant for backward compatibility.\n */\nThinParticleSystem.ForceGLSL = 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{ FactorGradient, ColorGradient, Color3Gradient, GradientHelper } from \"../Misc/gradients.js\";\nimport { Observable } from \"../Misc/observable.js\";\nimport { Vector3, Matrix, Vector4, TmpVectors } from \"../Maths/math.vector.js\";\nimport { VertexBuffer, Buffer } from \"../Buffers/buffer.js\";\nimport { RawTexture } from \"../Materials/Textures/rawTexture.js\";\nimport { EngineStore } from \"../Engines/engineStore.js\";\nimport { BaseParticleSystem } from \"./baseParticleSystem.js\";\nimport { Particle } from \"./particle.js\";\n\nimport { DrawWrapper } from \"../Materials/drawWrapper.js\";\nimport { Color4, Color3, TmpColors } from \"../Maths/math.color.js\";\nimport \"../Engines/Extensions/engine.alpha.js\";\nimport { addClipPlaneUniforms, prepareStringDefinesForClipPlanes, bindClipPlane } from \"../Materials/clipPlaneMaterialHelper.js\";\nimport { BindFogParameters, BindLogDepth } from \"../Materials/materialHelper.functions.js\";\nimport { BoxParticleEmitter } from \"./EmitterTypes/boxParticleEmitter.js\";\nimport { Clamp, Lerp, RandomRange } from \"../Maths/math.scalar.functions.js\";\nimport { PrepareSamplersForImageProcessing, PrepareUniformsForImageProcessing } from \"../Materials/imageProcessingConfiguration.functions.js\";\n/**\n * This represents a thin particle system in Babylon.\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 * Particles can take different shapes while emitted like box, sphere, cone or you can write your custom function.\n * This thin version contains a limited subset of the total features in order to provide users with a way to get particles but with a smaller footprint\n * @example https://doc.babylonjs.com/features/featuresDeepDive/particles/particle_system/particle_system_intro\n */\nexport class ThinParticleSystem extends BaseParticleSystem {\n /**\n * Sets a callback that will be triggered when the system is disposed\n */\n set onDispose(callback) {\n if (this._onDisposeObserver) {\n this.onDisposeObservable.remove(this._onDisposeObserver);\n }\n this._onDisposeObserver = this.onDisposeObservable.add(callback);\n }\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 return this._useRampGradients;\n }\n set useRampGradients(value) {\n if (this._useRampGradients === value) {\n return;\n }\n this._useRampGradients = value;\n this._resetEffect();\n }\n /**\n * Gets the current list of active particles\n */\n get particles() {\n return this._particles;\n }\n /**\n * Gets the shader language used in this material.\n */\n get shaderLanguage() {\n return this._shaderLanguage;\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._particles.length;\n }\n /**\n * Returns the string \"ParticleSystem\"\n * @returns a string containing the class name\n */\n getClassName() {\n return \"ParticleSystem\";\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 this._stopped && this.isAlive();\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 if (this._customWrappers[blendMode].drawContext) {\n this._customWrappers[blendMode].drawContext.useInstancing = this._useInstancing;\n }\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 \"particles\";\n }\n /**\n * Gets the vertex buffers used by the particle system\n */\n get vertexBuffers() {\n return this._vertexBuffers;\n }\n /**\n * Gets the index buffer used by the particle system (or null if no index buffer is used (if _useInstancing=true))\n */\n get indexBuffer() {\n return this._indexBuffer;\n }\n /**\n * Instantiates a 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 capacity The max number of particles alive at the same time\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 * @param epsilon Offset used to render the particles\n */\n constructor(name, capacity, sceneOrEngine, customEffect = null, isAnimationSheetEnabled = false, epsilon = 0.01) {\n super(name);\n this._emitterInverseWorldMatrix = Matrix.Identity();\n /**\n * @internal\n */\n this._inheritedVelocityOffset = new Vector3();\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 this._particles = new Array();\n this._stockParticles = new Array();\n this._newPartsExcess = 0;\n this._vertexBuffers = {};\n this._scaledColorStep = new Color4(0, 0, 0, 0);\n this._colorDiff = new Color4(0, 0, 0, 0);\n this._scaledDirection = Vector3.Zero();\n this._scaledGravity = Vector3.Zero();\n this._currentRenderId = -1;\n this._useInstancing = false;\n this._started = false;\n this._stopped = false;\n this._actualFrame = 0;\n /** @internal */\n this._currentEmitRate1 = 0;\n /** @internal */\n this._currentEmitRate2 = 0;\n /** @internal */\n this._currentStartSize1 = 0;\n /** @internal */\n this._currentStartSize2 = 0;\n /** Indicates that the update of particles is done in the animate function */\n this.updateInAnimate = true;\n this._rawTextureWidth = 256;\n this._useRampGradients = 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 CPU based */\n this.isGPU = false;\n /** Shader language used by the material */\n this._shaderLanguage = 0 /* ShaderLanguage.GLSL */;\n /** @internal */\n this._onBeforeDrawParticlesObservable = null;\n /** @internal */\n this._emitFromParticle = (particle) => {\n // Do nothing\n };\n // start of sub system methods\n /**\n * \"Recycles\" one of the particle by copying it back to the \"stock\" of particles and removing it from the active list.\n * Its lifetime will start back at 0.\n * @param particle\n */\n this.recycleParticle = (particle) => {\n // move particle from activeParticle list to stock particles\n const lastParticle = this._particles.pop();\n if (lastParticle !== particle) {\n lastParticle.copyTo(particle);\n }\n this._stockParticles.push(lastParticle);\n };\n this._createParticle = () => {\n let particle;\n if (this._stockParticles.length !== 0) {\n particle = this._stockParticles.pop();\n particle._reset();\n }\n else {\n particle = new Particle(this);\n }\n this._prepareParticle(particle);\n return particle;\n };\n this._shadersLoaded = false;\n this._capacity = capacity;\n this._epsilon = epsilon;\n this._isAnimationSheetEnabled = isAnimationSheetEnabled;\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().vertexArrayObject) {\n this._vertexArrayObject = null;\n }\n this._initShaderSourceAsync();\n // Setup the default processing configuration to the scene.\n this._attachImageProcessingConfiguration(null);\n // eslint-disable-next-line @typescript-eslint/naming-convention\n this._customWrappers = { 0: new DrawWrapper(this._engine) };\n this._customWrappers[0].effect = customEffect;\n this._drawWrappers = [];\n this._useInstancing = this._engine.getCaps().instancedArrays;\n this._createIndexBuffer();\n this._createVertexBuffers();\n // Default emitter type\n this.particleEmitterType = new BoxParticleEmitter();\n let noiseTextureData = null;\n // Update\n this.updateFunction = (particles) => {\n let noiseTextureSize = null;\n if (this.noiseTexture) {\n // We need to get texture data back to CPU\n noiseTextureSize = this.noiseTexture.getSize();\n this.noiseTexture.getContent()?.then((data) => {\n noiseTextureData = data;\n });\n }\n const sameParticleArray = particles === this._particles;\n for (let index = 0; index < particles.length; index++) {\n const particle = particles[index];\n let scaledUpdateSpeed = this._scaledUpdateSpeed;\n const previousAge = particle.age;\n particle.age += scaledUpdateSpeed;\n // Evaluate step to death\n if (particle.age > particle.lifeTime) {\n const diff = particle.age - previousAge;\n const oldDiff = particle.lifeTime - previousAge;\n scaledUpdateSpeed = (oldDiff * scaledUpdateSpeed) / diff;\n particle.age = particle.lifeTime;\n }\n const ratio = particle.age / particle.lifeTime;\n // Color\n if (this._colorGradients && this._colorGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._colorGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentColorGradient) {\n particle._currentColor1.copyFrom(particle._currentColor2);\n nextGradient.getColorToRef(particle._currentColor2);\n particle._currentColorGradient = currentGradient;\n }\n Color4.LerpToRef(particle._currentColor1, particle._currentColor2, scale, particle.color);\n });\n }\n else {\n particle.colorStep.scaleToRef(scaledUpdateSpeed, this._scaledColorStep);\n particle.color.addInPlace(this._scaledColorStep);\n if (particle.color.a < 0) {\n particle.color.a = 0;\n }\n }\n // Angular speed\n if (this._angularSpeedGradients && this._angularSpeedGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._angularSpeedGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentAngularSpeedGradient) {\n particle._currentAngularSpeed1 = particle._currentAngularSpeed2;\n particle._currentAngularSpeed2 = nextGradient.getFactor();\n particle._currentAngularSpeedGradient = currentGradient;\n }\n particle.angularSpeed = Lerp(particle._currentAngularSpeed1, particle._currentAngularSpeed2, scale);\n });\n }\n particle.angle += particle.angularSpeed * scaledUpdateSpeed;\n // Direction\n let directionScale = scaledUpdateSpeed;\n /// Velocity\n if (this._velocityGradients && this._velocityGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._velocityGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentVelocityGradient) {\n particle._currentVelocity1 = particle._currentVelocity2;\n particle._currentVelocity2 = nextGradient.getFactor();\n particle._currentVelocityGradient = currentGradient;\n }\n directionScale *= Lerp(particle._currentVelocity1, particle._currentVelocity2, scale);\n });\n }\n particle.direction.scaleToRef(directionScale, this._scaledDirection);\n /// Limit velocity\n if (this._limitVelocityGradients && this._limitVelocityGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._limitVelocityGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentLimitVelocityGradient) {\n particle._currentLimitVelocity1 = particle._currentLimitVelocity2;\n particle._currentLimitVelocity2 = nextGradient.getFactor();\n particle._currentLimitVelocityGradient = currentGradient;\n }\n const limitVelocity = Lerp(particle._currentLimitVelocity1, particle._currentLimitVelocity2, scale);\n const currentVelocity = particle.direction.length();\n if (currentVelocity > limitVelocity) {\n particle.direction.scaleInPlace(this.limitVelocityDamping);\n }\n });\n }\n /// Drag\n if (this._dragGradients && this._dragGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._dragGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentDragGradient) {\n particle._currentDrag1 = particle._currentDrag2;\n particle._currentDrag2 = nextGradient.getFactor();\n particle._currentDragGradient = currentGradient;\n }\n const drag = Lerp(particle._currentDrag1, particle._currentDrag2, scale);\n this._scaledDirection.scaleInPlace(1.0 - drag);\n });\n }\n if (this.isLocal && particle._localPosition) {\n particle._localPosition.addInPlace(this._scaledDirection);\n Vector3.TransformCoordinatesToRef(particle._localPosition, this._emitterWorldMatrix, particle.position);\n }\n else {\n particle.position.addInPlace(this._scaledDirection);\n }\n // Noise\n if (noiseTextureData && noiseTextureSize && particle._randomNoiseCoordinates1) {\n const fetchedColorR = this._fetchR(particle._randomNoiseCoordinates1.x, particle._randomNoiseCoordinates1.y, noiseTextureSize.width, noiseTextureSize.height, noiseTextureData);\n const fetchedColorG = this._fetchR(particle._randomNoiseCoordinates1.z, particle._randomNoiseCoordinates2.x, noiseTextureSize.width, noiseTextureSize.height, noiseTextureData);\n const fetchedColorB = this._fetchR(particle._randomNoiseCoordinates2.y, particle._randomNoiseCoordinates2.z, noiseTextureSize.width, noiseTextureSize.height, noiseTextureData);\n const force = TmpVectors.Vector3[0];\n const scaledForce = TmpVectors.Vector3[1];\n force.copyFromFloats((2 * fetchedColorR - 1) * this.noiseStrength.x, (2 * fetchedColorG - 1) * this.noiseStrength.y, (2 * fetchedColorB - 1) * this.noiseStrength.z);\n force.scaleToRef(scaledUpdateSpeed, scaledForce);\n particle.direction.addInPlace(scaledForce);\n }\n // Gravity\n this.gravity.scaleToRef(scaledUpdateSpeed, this._scaledGravity);\n particle.direction.addInPlace(this._scaledGravity);\n // Size\n if (this._sizeGradients && this._sizeGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._sizeGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== particle._currentSizeGradient) {\n particle._currentSize1 = particle._currentSize2;\n particle._currentSize2 = nextGradient.getFactor();\n particle._currentSizeGradient = currentGradient;\n }\n particle.size = Lerp(particle._currentSize1, particle._currentSize2, scale);\n });\n }\n // Remap data\n if (this._useRampGradients) {\n if (this._colorRemapGradients && this._colorRemapGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._colorRemapGradients, (currentGradient, nextGradient, scale) => {\n const min = Lerp(currentGradient.factor1, nextGradient.factor1, scale);\n const max = Lerp(currentGradient.factor2, nextGradient.factor2, scale);\n particle.remapData.x = min;\n particle.remapData.y = max - min;\n });\n }\n if (this._alphaRemapGradients && this._alphaRemapGradients.length > 0) {\n GradientHelper.GetCurrentGradient(ratio, this._alphaRemapGradients, (currentGradient, nextGradient, scale) => {\n const min = Lerp(currentGradient.factor1, nextGradient.factor1, scale);\n const max = Lerp(currentGradient.factor2, nextGradient.factor2, scale);\n particle.remapData.z = min;\n particle.remapData.w = max - min;\n });\n }\n }\n if (this._isAnimationSheetEnabled) {\n particle.updateCellIndex();\n }\n // Update the position of the attached sub-emitters to match their attached particle\n particle._inheritParticleInfoToSubEmitters();\n if (particle.age >= particle.lifeTime) {\n // Recycle by swapping with last particle\n this._emitFromParticle(particle);\n if (particle._attachedSubEmitters) {\n particle._attachedSubEmitters.forEach((subEmitter) => {\n subEmitter.particleSystem.disposeOnStop = true;\n subEmitter.particleSystem.stop();\n });\n particle._attachedSubEmitters = null;\n }\n this.recycleParticle(particle);\n if (sameParticleArray) {\n index--;\n }\n continue;\n }\n }\n };\n }\n serialize(serializeTexture) {\n throw new Error(\"Method not implemented.\");\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 */\n clone(name, newEmitter, cloneTexture = false) {\n throw new Error(\"Method not implemented.\");\n }\n _addFactorGradient(factorGradients, gradient, factor, factor2) {\n const newGradient = new FactorGradient(gradient, factor, factor2);\n factorGradients.push(newGradient);\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 _removeFactorGradient(factorGradients, gradient) {\n if (!factorGradients) {\n return;\n }\n let index = 0;\n for (const factorGradient of factorGradients) {\n if (factorGradient.gradient === gradient) {\n factorGradients.splice(index, 1);\n break;\n }\n index++;\n }\n }\n /**\n * Adds a new life time gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the life time factor to affect to the specified gradient\n * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addLifeTimeGradient(gradient, factor, factor2) {\n if (!this._lifeTimeGradients) {\n this._lifeTimeGradients = [];\n }\n this._addFactorGradient(this._lifeTimeGradients, gradient, factor, factor2);\n return this;\n }\n /**\n * Remove a specific life time gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeLifeTimeGradient(gradient) {\n this._removeFactorGradient(this._lifeTimeGradients, gradient);\n return this;\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addSizeGradient(gradient, factor, factor2) {\n if (!this._sizeGradients) {\n this._sizeGradients = [];\n }\n this._addFactorGradient(this._sizeGradients, gradient, factor, factor2);\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._removeFactorGradient(this._sizeGradients, gradient);\n return this;\n }\n /**\n * Adds a new color remap gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param min defines the color remap minimal range\n * @param max defines the color remap maximal range\n * @returns the current particle system\n */\n addColorRemapGradient(gradient, min, max) {\n if (!this._colorRemapGradients) {\n this._colorRemapGradients = [];\n }\n this._addFactorGradient(this._colorRemapGradients, gradient, min, max);\n return this;\n }\n /**\n * Remove a specific color remap gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeColorRemapGradient(gradient) {\n this._removeFactorGradient(this._colorRemapGradients, gradient);\n return this;\n }\n /**\n * Adds a new alpha remap gradient\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param min defines the alpha remap minimal range\n * @param max defines the alpha remap maximal range\n * @returns the current particle system\n */\n addAlphaRemapGradient(gradient, min, max) {\n if (!this._alphaRemapGradients) {\n this._alphaRemapGradients = [];\n }\n this._addFactorGradient(this._alphaRemapGradients, gradient, min, max);\n return this;\n }\n /**\n * Remove a specific alpha remap gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeAlphaRemapGradient(gradient) {\n this._removeFactorGradient(this._alphaRemapGradients, gradient);\n return this;\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addAngularSpeedGradient(gradient, factor, factor2) {\n if (!this._angularSpeedGradients) {\n this._angularSpeedGradients = [];\n }\n this._addFactorGradient(this._angularSpeedGradients, gradient, factor, factor2);\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._removeFactorGradient(this._angularSpeedGradients, gradient);\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addVelocityGradient(gradient, factor, factor2) {\n if (!this._velocityGradients) {\n this._velocityGradients = [];\n }\n this._addFactorGradient(this._velocityGradients, gradient, factor, factor2);\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._removeFactorGradient(this._velocityGradients, gradient);\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addLimitVelocityGradient(gradient, factor, factor2) {\n if (!this._limitVelocityGradients) {\n this._limitVelocityGradients = [];\n }\n this._addFactorGradient(this._limitVelocityGradients, gradient, factor, factor2);\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._removeFactorGradient(this._limitVelocityGradients, gradient);\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 * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addDragGradient(gradient, factor, factor2) {\n if (!this._dragGradients) {\n this._dragGradients = [];\n }\n this._addFactorGradient(this._dragGradients, gradient, factor, factor2);\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._removeFactorGradient(this._dragGradients, gradient);\n return this;\n }\n /**\n * Adds a new emit rate gradient (please note that this will only work if you set the targetStopDuration property)\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the emit rate value to affect to the specified gradient\n * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addEmitRateGradient(gradient, factor, factor2) {\n if (!this._emitRateGradients) {\n this._emitRateGradients = [];\n }\n this._addFactorGradient(this._emitRateGradients, gradient, factor, factor2);\n return this;\n }\n /**\n * Remove a specific emit rate gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeEmitRateGradient(gradient) {\n this._removeFactorGradient(this._emitRateGradients, gradient);\n return this;\n }\n /**\n * Adds a new start size gradient (please note that this will only work if you set the targetStopDuration property)\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param factor defines the start size value to affect to the specified gradient\n * @param factor2 defines an additional factor used to define a range ([factor, factor2]) with main value to pick the final value from\n * @returns the current particle system\n */\n addStartSizeGradient(gradient, factor, factor2) {\n if (!this._startSizeGradients) {\n this._startSizeGradients = [];\n }\n this._addFactorGradient(this._startSizeGradients, gradient, factor, factor2);\n return this;\n }\n /**\n * Remove a specific start size gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeStartSizeGradient(gradient) {\n this._removeFactorGradient(this._startSizeGradients, gradient);\n return this;\n }\n _createRampGradientTexture() {\n if (!this._rampGradients || !this._rampGradients.length || this._rampGradientsTexture || !this._scene) {\n return;\n }\n const data = new Uint8Array(this._rawTextureWidth * 4);\n const tmpColor = TmpColors.Color3[0];\n for (let x = 0; x < this._rawTextureWidth; x++) {\n const ratio = x / this._rawTextureWidth;\n GradientHelper.GetCurrentGradient(ratio, this._rampGradients, (currentGradient, nextGradient, scale) => {\n Color3.LerpToRef(currentGradient.color, nextGradient.color, 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] = 255;\n });\n }\n this._rampGradientsTexture = RawTexture.CreateRGBATexture(data, this._rawTextureWidth, 1, this._scene, false, false, 1);\n }\n /**\n * Gets the current list of ramp gradients.\n * You must use addRampGradient and removeRampGradient to update this list\n * @returns the list of ramp gradients\n */\n getRampGradients() {\n return this._rampGradients;\n }\n /** Force the system to rebuild all gradients that need to be resync */\n forceRefreshGradients() {\n this._syncRampGradientTexture();\n }\n _syncRampGradientTexture() {\n if (!this._rampGradients) {\n return;\n }\n this._rampGradients.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 if (this._rampGradientsTexture) {\n this._rampGradientsTexture.dispose();\n this._rampGradientsTexture = null;\n }\n this._createRampGradientTexture();\n }\n /**\n * Adds a new ramp gradient used to remap particle colors\n * @param gradient defines the gradient to use (between 0 and 1)\n * @param color defines the color to affect to the specified gradient\n * @returns the current particle system\n */\n addRampGradient(gradient, color) {\n if (!this._rampGradients) {\n this._rampGradients = [];\n }\n const rampGradient = new Color3Gradient(gradient, color);\n this._rampGradients.push(rampGradient);\n this._syncRampGradientTexture();\n return this;\n }\n /**\n * Remove a specific ramp gradient\n * @param gradient defines the gradient to remove\n * @returns the current particle system\n */\n removeRampGradient(gradient) {\n this._removeGradientAndTexture(gradient, this._rampGradients, this._rampGradientsTexture);\n this._rampGradientsTexture = null;\n if (this._rampGradients && this._rampGradients.length > 0) {\n this._createRampGradientTexture();\n }\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 * @param color2 defines an additional color used to define a range ([color, color2]) with main color to pick the final color from\n * @returns this particle system\n */\n addColorGradient(gradient, color1, color2) {\n if (!this._colorGradients) {\n this._colorGradients = [];\n }\n const colorGradient = new ColorGradient(gradient, color1, color2);\n this._colorGradients.push(colorGradient);\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 return this;\n }\n /**\n * Remove a specific color gradient\n * @param gradient defines the gradient to remove\n * @returns this particle system\n */\n removeColorGradient(gradient) {\n if (!this._colorGradients) {\n return this;\n }\n let index = 0;\n for (const colorGradient of this._colorGradients) {\n if (colorGradient.gradient === gradient) {\n this._colorGradients.splice(index, 1);\n break;\n }\n index++;\n }\n return this;\n }\n /**\n * Resets the draw wrappers cache\n */\n resetDrawCache() {\n for (const drawWrappers of this._drawWrappers) {\n if (drawWrappers) {\n for (const drawWrapper of drawWrappers) {\n drawWrapper?.dispose();\n }\n }\n }\n this._drawWrappers = [];\n }\n _fetchR(u, v, width, height, pixels) {\n u = Math.abs(u) * 0.5 + 0.5;\n v = Math.abs(v) * 0.5 + 0.5;\n const wrappedU = (u * width) % width | 0;\n const wrappedV = (v * height) % height | 0;\n const position = (wrappedU + wrappedV * width) * 4;\n return pixels[position] / 255;\n }\n _reset() {\n this._resetEffect();\n }\n _resetEffect() {\n if (this._vertexBuffer) {\n this._vertexBuffer.dispose();\n this._vertexBuffer = null;\n }\n if (this._spriteBuffer) {\n this._spriteBuffer.dispose();\n this._spriteBuffer = null;\n }\n if (this._vertexArrayObject) {\n this._engine.releaseVertexArrayObject(this._vertexArrayObject);\n this._vertexArrayObject = null;\n }\n this._createVertexBuffers();\n }\n _createVertexBuffers() {\n this._vertexBufferSize = this._useInstancing ? 10 : 12;\n if (this._isAnimationSheetEnabled) {\n this._vertexBufferSize += 1;\n }\n if (!this._isBillboardBased ||\n this.billboardMode === 8 ||\n this.billboardMode === 9) {\n this._vertexBufferSize += 3;\n }\n if (this._useRampGradients) {\n this._vertexBufferSize += 4;\n }\n const engine = this._engine;\n const vertexSize = this._vertexBufferSize * (this._useInstancing ? 1 : 4);\n this._vertexData = new Float32Array(this._capacity * vertexSize);\n this._vertexBuffer = new Buffer(engine, this._vertexData, true, vertexSize);\n let dataOffset = 0;\n const positions = this._vertexBuffer.createVertexBuffer(VertexBuffer.PositionKind, dataOffset, 3, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[VertexBuffer.PositionKind] = positions;\n dataOffset += 3;\n const colors = this._vertexBuffer.createVertexBuffer(VertexBuffer.ColorKind, dataOffset, 4, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[VertexBuffer.ColorKind] = colors;\n dataOffset += 4;\n const options = this._vertexBuffer.createVertexBuffer(\"angle\", dataOffset, 1, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"angle\"] = options;\n dataOffset += 1;\n const size = this._vertexBuffer.createVertexBuffer(\"size\", dataOffset, 2, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"size\"] = size;\n dataOffset += 2;\n if (this._isAnimationSheetEnabled) {\n const cellIndexBuffer = this._vertexBuffer.createVertexBuffer(\"cellIndex\", dataOffset, 1, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"cellIndex\"] = cellIndexBuffer;\n dataOffset += 1;\n }\n if (!this._isBillboardBased ||\n this.billboardMode === 8 ||\n this.billboardMode === 9) {\n const directionBuffer = this._vertexBuffer.createVertexBuffer(\"direction\", dataOffset, 3, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"direction\"] = directionBuffer;\n dataOffset += 3;\n }\n if (this._useRampGradients) {\n const rampDataBuffer = this._vertexBuffer.createVertexBuffer(\"remapData\", dataOffset, 4, this._vertexBufferSize, this._useInstancing);\n this._vertexBuffers[\"remapData\"] = rampDataBuffer;\n dataOffset += 4;\n }\n let offsets;\n if (this._useInstancing) {\n const spriteData = new Float32Array([0, 0, 1, 0, 0, 1, 1, 1]);\n this._spriteBuffer = new Buffer(engine, spriteData, false, 2);\n offsets = this._spriteBuffer.createVertexBuffer(\"offset\", 0, 2);\n }\n else {\n offsets = this._vertexBuffer.createVertexBuffer(\"offset\", dataOffset, 2, this._vertexBufferSize, this._useInstancing);\n dataOffset += 2;\n }\n this._vertexBuffers[\"offset\"] = offsets;\n this.resetDrawCache();\n }\n _createIndexBuffer() {\n if (this._useInstancing) {\n this._linesIndexBufferUseInstancing = this._engine.createIndexBuffer(new Uint32Array([0, 1, 1, 3, 3, 2, 2, 0, 0, 3]));\n return;\n }\n const indices = [];\n const indicesWireframe = [];\n let index = 0;\n for (let count = 0; count < this._capacity; count++) {\n indices.push(index);\n indices.push(index + 1);\n indices.push(index + 2);\n indices.push(index);\n indices.push(index + 2);\n indices.push(index + 3);\n indicesWireframe.push(index, index + 1, index + 1, index + 2, index + 2, index + 3, index + 3, index, index, index + 3);\n index += 4;\n }\n this._indexBuffer = this._engine.createIndexBuffer(indices);\n this._linesIndexBuffer = this._engine.createIndexBuffer(indicesWireframe);\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 whether there are still active particles in the system.\n * @returns True if it is alive, otherwise false.\n */\n isAlive() {\n return this._alive;\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 /** @internal */\n _preStart() {\n // Do nothing\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._actualFrame = 0;\n this._preStart();\n // Reset emit gradient so it acts the same on every start\n if (this._emitRateGradients) {\n if (this._emitRateGradients.length > 0) {\n this._currentEmitRateGradient = this._emitRateGradients[0];\n this._currentEmitRate1 = this._currentEmitRateGradient.getFactor();\n this._currentEmitRate2 = this._currentEmitRate1;\n }\n if (this._emitRateGradients.length > 1) {\n this._currentEmitRate2 = this._emitRateGradients[1].getFactor();\n }\n }\n // Reset start size gradient so it acts the same on every start\n if (this._startSizeGradients) {\n if (this._startSizeGradients.length > 0) {\n this._currentStartSizeGradient = this._startSizeGradients[0];\n this._currentStartSize1 = this._currentStartSizeGradient.getFactor();\n this._currentStartSize2 = this._currentStartSize1;\n }\n if (this._startSizeGradients.length > 1) {\n this._currentStartSize2 = this._startSizeGradients[1].getFactor();\n }\n }\n if (this.preWarmCycles) {\n if (this.emitter?.getClassName().indexOf(\"Mesh\") !== -1) {\n this.emitter.computeWorldMatrix(true);\n }\n const noiseTextureAsProcedural = this.noiseTexture;\n if (noiseTextureAsProcedural && noiseTextureAsProcedural.onGeneratedObservable) {\n noiseTextureAsProcedural.onGeneratedObservable.addOnce(() => {\n setTimeout(() => {\n for (let index = 0; index < this.preWarmCycles; index++) {\n this.animate(true);\n noiseTextureAsProcedural.render();\n }\n });\n });\n }\n else {\n for (let index = 0; index < this.preWarmCycles; index++) {\n this.animate(true);\n }\n }\n }\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 * @param stopSubEmitters if true it will stop the current system and all created sub-Systems if false it will stop the current root system only, this param is used by the root particle system only. The default value is true.\n */\n stop(stopSubEmitters = true) {\n if (this._stopped) {\n return;\n }\n this.onStoppedObservable.notifyObservers(this);\n this._stopped = true;\n this._postStop(stopSubEmitters);\n }\n /** @internal */\n _postStop(stopSubEmitters) {\n // Do nothing\n }\n // Animation sheet\n /**\n * Remove all active particles\n */\n reset() {\n this._stockParticles.length = 0;\n this._particles.length = 0;\n }\n /**\n * @internal (for internal use only)\n */\n _appendParticleVertex(index, particle, offsetX, offsetY) {\n let offset = index * this._vertexBufferSize;\n this._vertexData[offset++] = particle.position.x + this.worldOffset.x;\n this._vertexData[offset++] = particle.position.y + this.worldOffset.y;\n this._vertexData[offset++] = particle.position.z + this.worldOffset.z;\n this._vertexData[offset++] = particle.color.r;\n this._vertexData[offset++] = particle.color.g;\n this._vertexData[offset++] = particle.color.b;\n this._vertexData[offset++] = particle.color.a;\n this._vertexData[offset++] = particle.angle;\n this._vertexData[offset++] = particle.scale.x * particle.size;\n this._vertexData[offset++] = particle.scale.y * particle.size;\n if (this._isAnimationSheetEnabled) {\n this._vertexData[offset++] = particle.cellIndex;\n }\n if (!this._isBillboardBased) {\n if (particle._initialDirection) {\n let initialDirection = particle._initialDirection;\n if (this.isLocal) {\n Vector3.TransformNormalToRef(initialDirection, this._emitterWorldMatrix, TmpVectors.Vector3[0]);\n initialDirection = TmpVectors.Vector3[0];\n }\n if (initialDirection.x === 0 && initialDirection.z === 0) {\n initialDirection.x = 0.001;\n }\n this._vertexData[offset++] = initialDirection.x;\n this._vertexData[offset++] = initialDirection.y;\n this._vertexData[offset++] = initialDirection.z;\n }\n else {\n let direction = particle.direction;\n if (this.isLocal) {\n Vector3.TransformNormalToRef(direction, this._emitterWorldMatrix, TmpVectors.Vector3[0]);\n direction = TmpVectors.Vector3[0];\n }\n if (direction.x === 0 && direction.z === 0) {\n direction.x = 0.001;\n }\n this._vertexData[offset++] = direction.x;\n this._vertexData[offset++] = direction.y;\n this._vertexData[offset++] = direction.z;\n }\n }\n else if (this.billboardMode === 8 || this.billboardMode === 9) {\n this._vertexData[offset++] = particle.direction.x;\n this._vertexData[offset++] = particle.direction.y;\n this._vertexData[offset++] = particle.direction.z;\n }\n if (this._useRampGradients && particle.remapData) {\n this._vertexData[offset++] = particle.remapData.x;\n this._vertexData[offset++] = particle.remapData.y;\n this._vertexData[offset++] = particle.remapData.z;\n this._vertexData[offset++] = particle.remapData.w;\n }\n if (!this._useInstancing) {\n if (this._isAnimationSheetEnabled) {\n if (offsetX === 0) {\n offsetX = this._epsilon;\n }\n else if (offsetX === 1) {\n offsetX = 1 - this._epsilon;\n }\n if (offsetY === 0) {\n offsetY = this._epsilon;\n }\n else if (offsetY === 1) {\n offsetY = 1 - this._epsilon;\n }\n }\n this._vertexData[offset++] = offsetX;\n this._vertexData[offset++] = offsetY;\n }\n }\n /** @internal */\n _prepareParticle(particle) {\n //Do nothing\n }\n _update(newParticles) {\n // Update current\n this._alive = this._particles.length > 0;\n if (this.emitter.position) {\n const emitterMesh = this.emitter;\n this._emitterWorldMatrix = emitterMesh.getWorldMatrix();\n }\n else {\n const emitterPosition = this.emitter;\n this._emitterWorldMatrix = Matrix.Translation(emitterPosition.x, emitterPosition.y, emitterPosition.z);\n }\n this._emitterWorldMatrix.invertToRef(this._emitterInverseWorldMatrix);\n this.updateFunction(this._particles);\n // Add new ones\n let particle;\n for (let index = 0; index < newParticles; index++) {\n if (this._particles.length === this._capacity) {\n break;\n }\n particle = this._createParticle();\n this._particles.push(particle);\n // Life time\n if (this.targetStopDuration && this._lifeTimeGradients && this._lifeTimeGradients.length > 0) {\n const ratio = Clamp(this._actualFrame / this.targetStopDuration);\n GradientHelper.GetCurrentGradient(ratio, this._lifeTimeGradients, (currentGradient, nextGradient) => {\n const factorGradient1 = currentGradient;\n const factorGradient2 = nextGradient;\n const lifeTime1 = factorGradient1.getFactor();\n const lifeTime2 = factorGradient2.getFactor();\n const gradient = (ratio - factorGradient1.gradient) / (factorGradient2.gradient - factorGradient1.gradient);\n particle.lifeTime = Lerp(lifeTime1, lifeTime2, gradient);\n });\n }\n else {\n particle.lifeTime = RandomRange(this.minLifeTime, this.maxLifeTime);\n }\n // Emitter\n const emitPower = RandomRange(this.minEmitPower, this.maxEmitPower);\n if (this.startPositionFunction) {\n this.startPositionFunction(this._emitterWorldMatrix, particle.position, particle, this.isLocal);\n }\n else {\n this.particleEmitterType.startPositionFunction(this._emitterWorldMatrix, particle.position, particle, this.isLocal);\n }\n if (this.isLocal) {\n if (!particle._localPosition) {\n particle._localPosition = particle.position.clone();\n }\n else {\n particle._localPosition.copyFrom(particle.position);\n }\n Vector3.TransformCoordinatesToRef(particle._localPosition, this._emitterWorldMatrix, particle.position);\n }\n if (this.startDirectionFunction) {\n this.startDirectionFunction(this._emitterWorldMatrix, particle.direction, particle, this.isLocal);\n }\n else {\n this.particleEmitterType.startDirectionFunction(this._emitterWorldMatrix, particle.direction, particle, this.isLocal, this._emitterInverseWorldMatrix);\n }\n if (emitPower === 0) {\n if (!particle._initialDirection) {\n particle._initialDirection = particle.direction.clone();\n }\n else {\n particle._initialDirection.copyFrom(particle.direction);\n }\n }\n else {\n particle._initialDirection = null;\n }\n particle.direction.scaleInPlace(emitPower);\n // Size\n if (!this._sizeGradients || this._sizeGradients.length === 0) {\n particle.size = RandomRange(this.minSize, this.maxSize);\n }\n else {\n particle._currentSizeGradient = this._sizeGradients[0];\n particle._currentSize1 = particle._currentSizeGradient.getFactor();\n particle.size = particle._currentSize1;\n if (this._sizeGradients.length > 1) {\n particle._currentSize2 = this._sizeGradients[1].getFactor();\n }\n else {\n particle._currentSize2 = particle._currentSize1;\n }\n }\n // Size and scale\n particle.scale.copyFromFloats(RandomRange(this.minScaleX, this.maxScaleX), RandomRange(this.minScaleY, this.maxScaleY));\n // Adjust scale by start size\n if (this._startSizeGradients && this._startSizeGradients[0] && this.targetStopDuration) {\n const ratio = this._actualFrame / this.targetStopDuration;\n GradientHelper.GetCurrentGradient(ratio, this._startSizeGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== this._currentStartSizeGradient) {\n this._currentStartSize1 = this._currentStartSize2;\n this._currentStartSize2 = nextGradient.getFactor();\n this._currentStartSizeGradient = currentGradient;\n }\n const value = Lerp(this._currentStartSize1, this._currentStartSize2, scale);\n particle.scale.scaleInPlace(value);\n });\n }\n // Angle\n if (!this._angularSpeedGradients || this._angularSpeedGradients.length === 0) {\n particle.angularSpeed = RandomRange(this.minAngularSpeed, this.maxAngularSpeed);\n }\n else {\n particle._currentAngularSpeedGradient = this._angularSpeedGradients[0];\n particle.angularSpeed = particle._currentAngularSpeedGradient.getFactor();\n particle._currentAngularSpeed1 = particle.angularSpeed;\n if (this._angularSpeedGradients.length > 1) {\n particle._currentAngularSpeed2 = this._angularSpeedGradients[1].getFactor();\n }\n else {\n particle._currentAngularSpeed2 = particle._currentAngularSpeed1;\n }\n }\n particle.angle = RandomRange(this.minInitialRotation, this.maxInitialRotation);\n // Velocity\n if (this._velocityGradients && this._velocityGradients.length > 0) {\n particle._currentVelocityGradient = this._velocityGradients[0];\n particle._currentVelocity1 = particle._currentVelocityGradient.getFactor();\n if (this._velocityGradients.length > 1) {\n particle._currentVelocity2 = this._velocityGradients[1].getFactor();\n }\n else {\n particle._currentVelocity2 = particle._currentVelocity1;\n }\n }\n // Limit velocity\n if (this._limitVelocityGradients && this._limitVelocityGradients.length > 0) {\n particle._currentLimitVelocityGradient = this._limitVelocityGradients[0];\n particle._currentLimitVelocity1 = particle._currentLimitVelocityGradient.getFactor();\n if (this._limitVelocityGradients.length > 1) {\n particle._currentLimitVelocity2 = this._limitVelocityGradients[1].getFactor();\n }\n else {\n particle._currentLimitVelocity2 = particle._currentLimitVelocity1;\n }\n }\n // Drag\n if (this._dragGradients && this._dragGradients.length > 0) {\n particle._currentDragGradient = this._dragGradients[0];\n particle._currentDrag1 = particle._currentDragGradient.getFactor();\n if (this._dragGradients.length > 1) {\n particle._currentDrag2 = this._dragGradients[1].getFactor();\n }\n else {\n particle._currentDrag2 = particle._currentDrag1;\n }\n }\n // Color\n if (!this._colorGradients || this._colorGradients.length === 0) {\n const step = RandomRange(0, 1.0);\n Color4.LerpToRef(this.color1, this.color2, step, particle.color);\n this.colorDead.subtractToRef(particle.color, this._colorDiff);\n this._colorDiff.scaleToRef(1.0 / particle.lifeTime, particle.colorStep);\n }\n else {\n particle._currentColorGradient = this._colorGradients[0];\n particle._currentColorGradient.getColorToRef(particle.color);\n particle._currentColor1.copyFrom(particle.color);\n if (this._colorGradients.length > 1) {\n this._colorGradients[1].getColorToRef(particle._currentColor2);\n }\n else {\n particle._currentColor2.copyFrom(particle.color);\n }\n }\n // Sheet\n if (this._isAnimationSheetEnabled) {\n particle._initialStartSpriteCellID = this.startSpriteCellID;\n particle._initialEndSpriteCellID = this.endSpriteCellID;\n particle._initialSpriteCellLoop = this.spriteCellLoop;\n }\n // Inherited Velocity\n particle.direction.addInPlace(this._inheritedVelocityOffset);\n // Ramp\n if (this._useRampGradients) {\n particle.remapData = new Vector4(0, 1, 0, 1);\n }\n // Noise texture coordinates\n if (this.noiseTexture) {\n if (particle._randomNoiseCoordinates1) {\n particle._randomNoiseCoordinates1.copyFromFloats(Math.random(), Math.random(), Math.random());\n particle._randomNoiseCoordinates2.copyFromFloats(Math.random(), Math.random(), Math.random());\n }\n else {\n particle._randomNoiseCoordinates1 = new Vector3(Math.random(), Math.random(), Math.random());\n particle._randomNoiseCoordinates2 = new Vector3(Math.random(), Math.random(), Math.random());\n }\n }\n // Update the position of the attached sub-emitters to match their attached particle\n particle._inheritParticleInfoToSubEmitters();\n }\n }\n /**\n * @internal\n */\n static _GetAttributeNamesOrOptions(isAnimationSheetEnabled = false, isBillboardBased = false, useRampGradients = false) {\n const attributeNamesOrOptions = [VertexBuffer.PositionKind, VertexBuffer.ColorKind, \"angle\", \"offset\", \"size\"];\n if (isAnimationSheetEnabled) {\n attributeNamesOrOptions.push(\"cellIndex\");\n }\n if (!isBillboardBased) {\n attributeNamesOrOptions.push(\"direction\");\n }\n if (useRampGradients) {\n attributeNamesOrOptions.push(\"remapData\");\n }\n return attributeNamesOrOptions;\n }\n /**\n * @internal\n */\n static _GetEffectCreationOptions(isAnimationSheetEnabled = false, useLogarithmicDepth = false, applyFog = false) {\n const effectCreationOption = [\"invView\", \"view\", \"projection\", \"textureMask\", \"translationPivot\", \"eyePosition\"];\n addClipPlaneUniforms(effectCreationOption);\n if (isAnimationSheetEnabled) {\n effectCreationOption.push(\"particlesInfos\");\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, fillImageProcessing = true) {\n if (this._scene) {\n prepareStringDefinesForClipPlanes(this, this._scene, defines);\n if (this.applyFog && this._scene.fogEnabled && this._scene.fogMode !== 0) {\n defines.push(\"#define FOG\");\n }\n }\n if (this._isAnimationSheetEnabled) {\n defines.push(\"#define ANIMATESHEET\");\n }\n if (this.useLogarithmicDepth) {\n defines.push(\"#define LOGARITHMICDEPTH\");\n }\n if (blendMode === BaseParticleSystem.BLENDMODE_MULTIPLY) {\n defines.push(\"#define BLENDMULTIPLYMODE\");\n }\n if (this._useRampGradients) {\n defines.push(\"#define RAMPGRADIENT\");\n }\n if (this._isBillboardBased) {\n defines.push(\"#define BILLBOARD\");\n switch (this.billboardMode) {\n case 2:\n defines.push(\"#define BILLBOARDY\");\n break;\n case 8:\n case 9:\n defines.push(\"#define BILLBOARDSTRETCHED\");\n if (this.billboardMode === 9) {\n defines.push(\"#define BILLBOARDSTRETCHED_LOCAL\");\n }\n break;\n case 7:\n defines.push(\"#define BILLBOARDMODE_ALL\");\n break;\n default:\n break;\n }\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(...ThinParticleSystem._GetAttributeNamesOrOptions(this._isAnimationSheetEnabled, this._isBillboardBased &&\n this.billboardMode !== 8 &&\n this.billboardMode !== 9, this._useRampGradients));\n uniforms.push(...ThinParticleSystem._GetEffectCreationOptions(this._isAnimationSheetEnabled, this.useLogarithmicDepth, this.applyFog));\n samplers.push(\"diffuseSampler\", \"rampSampler\");\n if (this._imageProcessingConfiguration) {\n PrepareUniformsForImageProcessing(uniforms, this._imageProcessingConfigurationDefines);\n PrepareSamplersForImageProcessing(samplers, this._imageProcessingConfigurationDefines);\n }\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 const currentRenderPassId = this._engine._features.supportRenderPasses ? this._engine.currentRenderPassId : 0;\n let drawWrappers = this._drawWrappers[currentRenderPassId];\n if (!drawWrappers) {\n drawWrappers = this._drawWrappers[currentRenderPassId] = [];\n }\n let drawWrapper = drawWrappers[blendMode];\n if (!drawWrapper) {\n drawWrapper = new DrawWrapper(this._engine);\n if (drawWrapper.drawContext) {\n drawWrapper.drawContext.useInstancing = this._useInstancing;\n }\n drawWrappers[blendMode] = drawWrapper;\n }\n const join = defines.join(\"\\n\");\n if (drawWrapper.defines !== join) {\n const attributesNamesOrOptions = [];\n const effectCreationOption = [];\n const samplers = [];\n this.fillUniformsAttributesAndSamplerNames(effectCreationOption, attributesNamesOrOptions, samplers);\n drawWrapper.setEffect(this._engine.createEffect(\"particles\", attributesNamesOrOptions, effectCreationOption, samplers, join, undefined, undefined, undefined, undefined, this._shaderLanguage), join);\n }\n return drawWrapper;\n }\n /**\n * Animates the particle system for the current frame by emitting new particles and or animating the living ones.\n * @param preWarmOnly will prevent the system from updating the vertex buffer (default is false)\n */\n animate(preWarmOnly = false) {\n if (!this._started) {\n return;\n }\n if (!preWarmOnly && this._scene) {\n // Check\n if (!this.isReady()) {\n return;\n }\n if (this._currentRenderId === this._scene.getFrameId()) {\n return;\n }\n this._currentRenderId = this._scene.getFrameId();\n }\n this._scaledUpdateSpeed = this.updateSpeed * (preWarmOnly ? this.preWarmStepOffset : this._scene?.getAnimationRatio() || 1);\n // Determine the number of particles we need to create\n let newParticles;\n if (this.manualEmitCount > -1) {\n newParticles = this.manualEmitCount;\n this._newPartsExcess = 0;\n this.manualEmitCount = 0;\n }\n else {\n let rate = this.emitRate;\n if (this._emitRateGradients && this._emitRateGradients.length > 0 && this.targetStopDuration) {\n const ratio = this._actualFrame / this.targetStopDuration;\n GradientHelper.GetCurrentGradient(ratio, this._emitRateGradients, (currentGradient, nextGradient, scale) => {\n if (currentGradient !== this._currentEmitRateGradient) {\n this._currentEmitRate1 = this._currentEmitRate2;\n this._currentEmitRate2 = nextGradient.getFactor();\n this._currentEmitRateGradient = currentGradient;\n }\n rate = Lerp(this._currentEmitRate1, this._currentEmitRate2, scale);\n });\n }\n newParticles = (rate * this._scaledUpdateSpeed) >> 0;\n this._newPartsExcess += rate * this._scaledUpdateSpeed - newParticles;\n }\n if (this._newPartsExcess > 1.0) {\n newParticles += this._newPartsExcess >> 0;\n this._newPartsExcess -= this._newPartsExcess >> 0;\n }\n this._alive = false;\n if (!this._stopped) {\n this._actualFrame += this._scaledUpdateSpeed;\n if (this.targetStopDuration && this._actualFrame >= this.targetStopDuration) {\n this.stop();\n }\n }\n else {\n newParticles = 0;\n }\n this._update(newParticles);\n // Stopped?\n if (this._stopped) {\n if (!this._alive) {\n this._started = false;\n if (this.onAnimationEnd) {\n this.onAnimationEnd();\n }\n if (this.disposeOnStop && this._scene) {\n this._scene._toBeDisposed.push(this);\n }\n }\n }\n if (!preWarmOnly) {\n // Update VBO\n let offset = 0;\n for (let index = 0; index < this._particles.length; index++) {\n const particle = this._particles[index];\n this._appendParticleVertices(offset, particle);\n offset += this._useInstancing ? 1 : 4;\n }\n if (this._vertexBuffer) {\n this._vertexBuffer.updateDirectly(this._vertexData, 0, this._particles.length);\n }\n }\n if (this.manualEmitCount === 0 && this.disposeOnStop) {\n this.stop();\n }\n }\n _appendParticleVertices(offset, particle) {\n this._appendParticleVertex(offset++, particle, 0, 0);\n if (!this._useInstancing) {\n this._appendParticleVertex(offset++, particle, 1, 0);\n this._appendParticleVertex(offset++, particle, 1, 1);\n this._appendParticleVertex(offset++, particle, 0, 1);\n }\n }\n /**\n * Rebuilds the particle system.\n */\n rebuild() {\n if (this._engine.getCaps().vertexArrayObject) {\n this._vertexArrayObject = null;\n }\n this._createIndexBuffer();\n this._spriteBuffer?._rebuild();\n this._createVertexBuffers();\n this.resetDrawCache();\n }\n async _initShaderSourceAsync() {\n const engine = this._engine;\n if (engine.isWebGPU && !ThinParticleSystem.ForceGLSL) {\n this._shaderLanguage = 1 /* ShaderLanguage.WGSL */;\n await Promise.all([import(\"../ShadersWGSL/particles.vertex.js\"), import(\"../ShadersWGSL/particles.fragment.js\")]);\n }\n else {\n await Promise.all([import(\"../Shaders/particles.vertex.js\"), import(\"../Shaders/particles.fragment.js\")]);\n }\n this._shadersLoaded = true;\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._shadersLoaded) {\n return false;\n }\n if (!this.emitter || (this._imageProcessingConfiguration && !this._imageProcessingConfiguration.isReady()) || !this.particleTexture || !this.particleTexture.isReady()) {\n return false;\n }\n if (this.blendMode !== BaseParticleSystem.BLENDMODE_MULTIPLYADD) {\n if (!this._getWrapper(this.blendMode).effect.isReady()) {\n return false;\n }\n }\n else {\n if (!this._getWrapper(BaseParticleSystem.BLENDMODE_MULTIPLY).effect.isReady()) {\n return false;\n }\n if (!this._getWrapper(BaseParticleSystem.BLENDMODE_ADD).effect.isReady()) {\n return false;\n }\n }\n return true;\n }\n _render(blendMode) {\n const drawWrapper = this._getWrapper(blendMode);\n const effect = drawWrapper.effect;\n const engine = this._engine;\n // Render\n engine.enableEffect(drawWrapper);\n const viewMatrix = this.defaultViewMatrix ?? this._scene.getViewMatrix();\n effect.setTexture(\"diffuseSampler\", this.particleTexture);\n effect.setMatrix(\"view\", viewMatrix);\n effect.setMatrix(\"projection\", 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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 viewMatrix.invertToRef(TmpVectors.Matrix[0]);\n effect.setMatrix(\"invView\", TmpVectors.Matrix[0]);\n }\n if (this._vertexArrayObject !== undefined) {\n if (this._scene?.forceWireframe) {\n engine.bindBuffers(this._vertexBuffers, this._linesIndexBufferUseInstancing, effect);\n }\n else {\n if (!this._vertexArrayObject) {\n this._vertexArrayObject = this._engine.recordVertexArrayObject(this._vertexBuffers, null, effect);\n }\n this._engine.bindVertexArrayObject(this._vertexArrayObject, this._scene?.forceWireframe ? this._linesIndexBufferUseInstancing : this._indexBuffer);\n }\n }\n else {\n if (!this._indexBuffer) {\n // Use instancing mode\n engine.bindBuffers(this._vertexBuffers, this._scene?.forceWireframe ? this._linesIndexBufferUseInstancing : null, effect);\n }\n else {\n 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