filters-and-postfx

name	filters-and-postfx
description	Use this skill when applying visual filters or post-processing effects in Phaser 4. Covers bloom, blur, glow, color matrix, barrel distortion, displacement, custom shaders, and the filter pipeline. Triggers on: filter, post-processing, shader, bloom, blur, glow, color effects.

Phaser 4 Filters and Post-FX

Quick Start

Add a glow effect to a sprite:

// In your Scene's create() method:
const sprite = this.add.sprite(400, 300, 'player');

// Step 1: Enable the filter system on the game object (WebGL only)
sprite.enableFilters();

// Step 2: Add filters via .filters.internal or .filters.external
sprite.filters.internal.addGlow(0xff00ff, 4, 0, 1);

Add a blur to the camera:

// Cameras have filters enabled by default - no enableFilters() needed
const camera = this.cameras.main;
camera.filters.internal.addBlur(0, 2, 2, 1);

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Core Concepts

How Filters Work in v4

Filters are GPU-based post-processing effects applied after an object or camera renders to a texture. Each filter runs a shader pass over that texture, producing the final visual output. Filters are WebGL only.

The rendering pipeline for a camera with filters:

1. Objects render to a texture the size of the camera.
2. Internal filters process that texture, applying effects in object/camera local space.
3. The texture is drawn to a context-sized texture, applying camera transformations (position, rotation, zoom).
4. External filters process that context texture, applying effects in screen space.
5. The final texture is composited into the output.

Internal vs External Filters

Every FilterList exposes two sub-lists: filters.internal and filters.external. The distinction controls when the filter runs relative to the camera/object transform:

• Internal -- applied before the camera transform. Effects operate in the object's local coordinate space. A horizontal blur on a rotated object appears rotated with the object. Internal filters only cover the object/camera region, so they are cheaper.
• External -- applied after the camera transform. Effects operate in screen space. A horizontal blur on a rotated object always blurs horizontally on screen. External filters are full-screen and more expensive.

Use internal filters wherever possible for better performance.

FilterList

FilterList (Phaser.GameObjects.Components.FilterList) is the container that holds filter controllers. It provides:

• add(filter, index) -- add a Controller instance at an optional index
• remove(filter, forceDestroy) -- remove and destroy a filter
• clear() -- remove and destroy all filters
• getActive() -- return all filters where active === true
• list -- the raw array of Controllers (safe to reorder)
• Convenience factory methods: addBlur(), addGlow(), addMask(), etc.

Filter Controllers

Every filter is a Phaser.Filters.Controller subclass. Common Controller properties:

Property	Type	Description
active	boolean	Toggle the filter on/off without removing it
camera	Camera	The camera that owns this filter
renderNode	string	The render node ID for the shader
paddingOverride	Rectangle	Override automatic padding calculation
ignoreDestroy	boolean	If true, the filter survives when its FilterList is destroyed (for reuse)

Key methods: setActive(bool), setPaddingOverride(left, top, right, bottom), getPadding(), destroy().

Enabling Filters on Game Objects

Cameras have filters available by default. Game objects do not -- you must call enableFilters() first:

const sprite = this.add.sprite(400, 300, 'hero');
sprite.enableFilters();

// Now sprite.filters is available
sprite.filters.internal.addGlow();
sprite.filters.external.addVignette();

enableFilters() creates an internal filterCamera on the game object that handles rendering the object to a texture for filter processing. It returns this for chaining.

Related properties on game objects after enabling:

Property	Default	Description
filterCamera	null -> Camera	The internal camera used for filter rendering
filters	null -> {internal, external}	Access to the FilterList pair
renderFilters	true	Master toggle for all filter rendering
filtersAutoFocus	true	Auto-adjust camera to follow the object
filtersFocusContext	false	Focus on the rendering context instead of the object bounds
filtersForceComposite	false	Always draw to a framebuffer even with no active filters
maxFilterSize	null -> Vector2	Maximum texture size for filter framebuffers

Use willRenderFilters() to check if any active filters will actually render.

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Common Patterns

Adding Filters to Game Objects

const sprite = this.add.sprite(400, 300, 'enemy');
sprite.enableFilters();

// Add a glow
const glow = sprite.filters.internal.addGlow(0x00ff00, 4);

// Modify at runtime
glow.outerStrength = 8;
glow.color = 0xff0000;

// Temporarily disable
glow.setActive(false);

// Remove and destroy
sprite.filters.internal.remove(glow);

Camera Filters

const camera = this.cameras.main;

// Internal: effect in camera-local space
const blur = camera.filters.internal.addBlur(0, 2, 2, 1);

// External: effect in screen space
const vignette = camera.filters.external.addVignette(0.5, 0.5, 0.5, 0.5);

// Color grading via ColorMatrix
const cm = camera.filters.internal.addColorMatrix();
cm.colorMatrix.sepia();

Chaining Multiple Filters

Filters execute in list order. Each filter receives the output of the previous one:

const cam = this.cameras.main;

// First: apply color grading
const cm = cam.filters.internal.addColorMatrix();
cm.colorMatrix.brightness(0.2);

// Second: apply blur to the color-graded result
cam.filters.internal.addBlur(1, 2, 2, 1);

// Third: add a vignette on top
cam.filters.external.addVignette(0.5, 0.5, 0.5, 0.8);

Masks via Filters

Masks in v4 are implemented as filters. They use the alpha channel of a texture or game object to control visibility:

// Mask with a static texture
sprite.enableFilters();
sprite.filters.internal.addMask('maskTexture');

// Mask with a game object (renders to DynamicTexture automatically)
const maskShape = this.add.circle(0, 0, 100, 0xffffff);
sprite.enableFilters();
const mask = sprite.filters.internal.addMask(maskShape);

// Invert the mask
mask.invert = true;

// Control auto-updating for game object masks
mask.autoUpdate = true;  // default: re-renders each frame
mask.needsUpdate = true; // force a one-time update

// Use a specific camera for viewing the mask object
sprite.filters.external.addMask(maskShape, false, this.cameras.main);

Internal masks match the object being filtered. External masks match the camera context. Use a viewCamera parameter to control which camera renders the mask game object.

Wipe / Reveal Transitions

const camera = this.cameras.main;
const wipe = camera.filters.external.addWipe(0.1, 0, 0);

// Animate via tween
this.tweens.add({
    targets: wipe,
    progress: 1,
    duration: 2000,
    ease: 'Linear'
});

// Direction helpers
wipe.setLeftToRight();
wipe.setTopToBottom();
wipe.setRevealEffect();   // reveal mode
wipe.setWipeEffect();     // wipe mode

// Wipe to another texture (for scene transitions)
wipe.setTexture('nextSceneCapture');

ParallelFilters (Custom Bloom and Compositing)

ParallelFilters splits the input into two paths, processes each independently, then blends the results. This replaces the dedicated Bloom filter from v3:

const camera = this.cameras.main;
const pf = camera.filters.internal.addParallelFilters();

// Top path: threshold bright areas, then blur them
pf.top.addThreshold(0.5, 1);
pf.top.addBlur();

// Configure the blend (how top combines onto bottom)
pf.blend.blendMode = Phaser.BlendModes.ADD;
pf.blend.amount = 0.5;

// Bottom path: left empty = uses original input

CaptureFrame for Scene-Level Effects

CaptureFrame captures the current render state at the point it appears in the display list. Objects rendered before it are captured; objects after it are not:

// Requires composite mode on the camera
this.cameras.main.setForceComposite(true);

// Objects rendered before CaptureFrame are captured
const bg = this.add.image(400, 300, 'background');

// Create the capture point
const capture = this.add.captureFrame('myCapture');

// Display the captured texture with filters applied
const display = this.add.image(400, 300, 'myCapture');
display.enableFilters();
display.filters.internal.addBlur(0, 4, 4, 2);

---

All Built-in Filters

Filter	Add Method	Description
Barrel	addBarrel(amount)	Pinch/expand distortion. amount=1 is neutral.
Blend	addBlend(texture, blendMode, amount, color)	Blend another texture using a blend mode. Supports modes not available in standard WebGL.
Blocky	addBlocky(config)	Pixelation that preserves original colors (no blending). Best without anti-aliasing.
Blur	addBlur(quality, x, y, strength, color, steps)	Gaussian blur. Quality: 0=low, 1=medium, 2=high.
Bokeh	addBokeh(radius, amount, contrast)	Depth-of-field bokeh blur effect.
ColorMatrix	addColorMatrix()	Color manipulation via matrix. Access .colorMatrix for sepia, grayscale, brightness, hue, etc.
CombineColorMatrix	addCombineColorMatrix(texture)	Combine channels from two textures via color matrices. Useful for alpha transfer.
Displacement	addDisplacement(texture, x, y)	Pixel displacement using a displacement map texture. Values are very small floats (e.g. 0.005).
Glow	addGlow(color, outerStrength, innerStrength, scale, knockout, quality, distance)	Luminous halo around edges. Supports inner/outer glow and knockout mode.
GradientMap	addGradientMap(config)	Recolor image using a ColorRamp based on brightness.
ImageLight	addImageLight(config)	Image-based lighting using a panorama environment map and normal map.
Key	addKey(config)	Chroma key: remove or isolate a specific color. Config: { color, threshold, feather, isolate }.
Mask	addMask(mask, invert, viewCamera, viewTransform, scaleFactor)	Alpha masking via texture or game object.
NormalTools	addNormalTools(config)

---

API Quick Reference

Enabling and Accessing Filters

// Game objects: must enable first
gameObject.enableFilters();
gameObject.filters.internal.addBlur();
gameObject.filters.external.addGlow();

// Cameras: filters available immediately
camera.filters.internal.addBlur();
camera.filters.external.addGlow();

FilterList Methods

const list = camera.filters.internal;

list.addBlur();                    // Factory method (one per filter type)
list.add(controllerInstance);      // Add a pre-built controller
list.add(controller, 2);           // Insert at index 2
list.remove(controller);           // Remove and destroy
list.clear();                      // Remove and destroy all
list.getActive();                  // Get all active controllers
list.list;                         // Raw array (reorder safely)

Controller Common API

controller.active = false;                  // Disable without removing
controller.setActive(true);                 // Enable (returns this)
controller.setPaddingOverride(10, 10, 10, 10); // Override padding
controller.setPaddingOverride(null);        // Clear override
controller.ignoreDestroy = true;            // Survive FilterList.destroy()
controller.destroy();                       // Manual cleanup

Mask Filter API

const mask = list.addMask('texKey');       // From texture key
const mask = list.addMask(gameObject);     // From game object
mask.invert = true;                         // Invert mask
mask.autoUpdate = false;                    // Stop auto-updating GO masks
mask.needsUpdate = true;                    // Force one update
mask.setTexture('newKey');                  // Change texture source
mask.setGameObject(newGO);                 // Change GO source
mask.viewCamera = otherCamera;             // Camera for GO rendering
mask.viewTransform = 'local';              // 'local' or 'world'
mask.scaleFactor = 0.5;                    // Scale mask texture size

ColorMatrix Presets

const cm = list.addColorMatrix();
cm.colorMatrix.sepia();
cm.colorMatrix.grayscale(1);
cm.colorMatrix.brightness(0.3);
cm.colorMatrix.hue(90);
cm.colorMatrix.saturate(-0.5);
cm.colorMatrix.contrast(0.3);
cm.colorMatrix.blackWhite();
cm.colorMatrix.negative();
cm.colorMatrix.desaturate();
cm.colorMatrix.night(0.5);
cm.colorMatrix.lsd();
cm.colorMatrix.brown();
cm.colorMatrix.vintagePinhole();
cm.colorMatrix.kodachrome();
cm.colorMatrix.technicolor();
cm.colorMatrix.polaroid();
cm.colorMatrix.shiftToBGR();

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Gotchas

1. WebGL only -- Filters do not work in Canvas renderer. enableFilters() returns early if WebGL is not available.

2. enableFilters() required for game objects -- Cameras have filters by default. Sprites, images, containers, and other game objects require enableFilters() before accessing filters.

3. Performance cost -- Each object with active filters creates extra draw calls (one for the base render plus one per active filter). Use sparingly and performance test early.

4. Internal vs external matters -- Internal filters are cheaper (object-region sized). External filters are full-screen. A blur that should rotate with the object must be internal; a blur that should stay screen-aligned must be external.

5. Filter order matters -- Filters are applied sequentially in list order. The output of one feeds into the next.

6. Glow quality and distance are immutable -- quality and distance on the Glow filter cannot be changed after creation. Destroy and recreate the filter to change them.

7. CaptureFrame requires forceComposite -- The camera must have setForceComposite(true) or otherwise render into a framebuffer for CaptureFrame to work.

8. Padding for expanding effects -- Filters like Blur, Glow, and Shadow can automatically calculate padding to expand the render texture. Override with setPaddingOverride() if needed. Pass null to clear the override. When used on a camera, use camera.getPaddingWrapper(x) to render more world outside the image edge.

9. Controller reuse -- By default, controllers are destroyed when their FilterList is destroyed. Set ignoreDestroy = true to reuse a controller across multiple objects, but you must manage its lifecycle manually. Works best with external filters.

10. Mask game object rendering -- When using a game object as a mask source, it is rendered to a DynamicTexture each frame (if autoUpdate is true). Set autoUpdate = false and use needsUpdate = true for one-shot updates to improve performance for static masks.

11. No Bloom filter -- v4 does not have a dedicated Bloom filter. Use ParallelFilters with Threshold + Blur + ADD blend instead (see Common Patterns), or use to automate the process.

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v4 Changes from v3

v3 (FX)	v4 (Filters)	Notes
gameObject.preFX / gameObject.postFX	gameObject.filters.internal / gameObject.filters.external	preFX/postFX replaced by internal/external filter lists
camera.postFX	camera.filters.internal / camera.filters.external	Cameras now have both internal and external lists
FX.addBloom()	Use ParallelFilters + Threshold + Blur	No dedicated Bloom filter; build it with ParallelFilters or Phaser.Actions.AddEffectBloom
FX.addCircle()	Use Vignette or Mask	Circle effect removed; use Vignette with radius or a circular Mask, or automate with Phaser.Actions.AddMaskShape
FX.addGradient()	Use Gradient GameObject + Quantize	New Gradient GameObject renders gradients; Quantize adds steps if wanted
Glow quality was 0-1 fraction	Glow quality is an integer (default 10)	Stochastic sampling replaces line sampling; higher quality at lower values
camera.setMask()	camera.filters.internal.addMask()	Masks are now filters, not a separate system
gameObject.setMask()	gameObject.filters.internal.addMask()	Same unified filter system
FX controllers	Phaser.Filters.Controller subclasses	Same pattern: returned controller objects with mutable properties
--	enableFilters() required for game objects	New explicit opt-in step for game objects
--	Blocky, Quantize, Key, Blend, CombineColorMatrix, ImageLight, NormalTools, PanoramaBlur, ParallelFilters, Sampler	New filters added in v4

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Source File Map

File	Description
src/gameobjects/components/Filters.js	Mixin that adds enableFilters(), filterCamera, filters to game objects
src/gameobjects/components/FilterList.js	FilterList class with all add*() factory methods
src/filters/Controller.js	Base Controller class for all filters
src/filters/Barrel.js	Barrel distortion filter
src/filters/Blend.js	Texture blend filter
src/filters/Blocky.js	Color-preserving pixelation filter
src/filters/Blur.js	Gaussian blur filter
src/filters/Bokeh.js	Bokeh / tilt shift filter
src/filters/ColorMatrix.js	Color matrix filter (sepia, grayscale, etc.)
src/filters/CombineColorMatrix.js	Dual-texture channel combining filter
src/filters/Displacement.js	Displacement map filter
src/filters/Glow.js	Glow/outline filter
src/filters/GradientMap.js	Gradient map recoloring filter
src/filters/ImageLight.js	Image-based lighting filter
src/filters/Key.js	Chroma key filter
src/filters/Mask.js	Alpha mask filter (texture or game object)
src/filters/NormalTools.js	Normal map manipulation filter
src/filters/PanoramaBlur.js	Spherical panorama blur filter
src/filters/ParallelFilters.js	Parallel filter paths with blend
src/filters/Pixelate.js	Pixelation filter

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Related: sprites-and-images.md, cameras.md, v4-new-features.md