---
title: "Phaser.Renderer.WebGL.Utils"
docs: "Phaser v3.90.0"
url: https://phaser.io/oss/docs/api-documentation/3.90.0/namespace/renderer-webgl-utils
site: Phaser - https://phaser.io
---

> This page is about the open-source Phaser framework, for writing a game's code by hand. To make a game with AI, use Phaser AE (https://phaser.io/): the desk's tools work with Web MCP, and the CLI works with your own coding agent. See "For AI agents: Phaser AE" at the end of this page.

# Phaser.Renderer.WebGL.Utils

Scope: 
static
> Source: [src/renderer/webgl/Utils.js#L9](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L9)  
Since: 3.0.0

## Static functions

### checkShaderMax

#### \<static> checkShaderMax(gl, maxTextures)


**Description:**

Check to see how many texture units the GPU supports in a fragment shader

and if the value specific in the game config is allowed.



This value is hard-clamped to 16 for performance reasons on Android devices.

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| gl | WebGLRenderingContext | No | The WebGLContext used to create the shaders. |
| maxTextures | number | No | The Game Config maxTextures value. |


**Returns:** number - The number of texture units that is supported by this browser and GPU.


> Source: [src/renderer/webgl/Utils.js#L99](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L99)  
Since: 3.50.0


---

### getFloatsFromUintRGB

#### \<static> getFloatsFromUintRGB(rgb)


**Description:**

Unpacks a Uint24 RGB into an array of floats of ranges of 0.0 and 1.0

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| rgb | number | No | RGB packed as a Uint24 |


**Returns:** array - Array of floats representing each component as a float


> Source: [src/renderer/webgl/Utils.js#L80](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L80)  
Since: 3.0.0


---

### getTintAppendFloatAlpha

#### \<static> getTintAppendFloatAlpha(rgb, a)


**Description:**

Packs a Uint24, representing RGB components, with a Float32, representing

the alpha component, with a range between 0.0 and 1.0 and return a Uint32

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| rgb | number | No | Uint24 representing RGB components |
| a | number | No | Float32 representing Alpha component |


**Returns:** number - Packed RGBA as Uint32


> Source: [src/renderer/webgl/Utils.js#L38](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L38)  
Since: 3.0.0


---

### getTintAppendFloatAlphaAndSwap

#### \<static> getTintAppendFloatAlphaAndSwap(rgb, a)


**Description:**

Packs a Uint24, representing RGB components, with a Float32, representing

the alpha component, with a range between 0.0 and 1.0 and return a

swizzled Uint32

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| rgb | number | No | Uint24 representing RGB components |
| a | number | No | Float32 representing Alpha component |


**Returns:** number - Packed RGBA as Uint32


> Source: [src/renderer/webgl/Utils.js#L57](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L57)  
Since: 3.0.0


---

### getTintFromFloats

#### \<static> getTintFromFloats(r, g, b, a)


**Description:**

Packs four floats on a range from 0.0 to 1.0 into a single Uint32

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| r | number | No | Red component in a range from 0.0 to 1.0 |
| g | number | No | Green component in a range from 0.0 to 1.0 |
| b | number | No | Blue component in a range from 0.0 to 1.0 |
| a | number | No | Alpha component in a range from 0.0 to 1.0 |


**Returns:** number - The packed RGBA values as a Uint32.


> Source: [src/renderer/webgl/Utils.js#L15](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L15)  
Since: 3.0.0


---

### parseFragmentShaderMaxTextures

#### \<static> parseFragmentShaderMaxTextures(fragmentShaderSource, maxTextures)


**Description:**

Checks the given Fragment Shader Source for `%count%` and `%forloop%` declarations and

replaces those with GLSL code for setting `texture = texture2D(uMainSampler[i], outTexCoord)`.

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| fragmentShaderSource | string | No | The Fragment Shader source code to operate on. |
| maxTextures | number | No | The number of maxTextures value. |


**Returns:** string - The modified Fragment Shader source.


> Source: [src/renderer/webgl/Utils.js#L131](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L131)  
Since: 3.50.0


---

### setGlowQuality

#### \<static> setGlowQuality(shader, game, [quality], [distance])


**Description:**

Takes the Glow FX Shader source and parses out the __SIZE__ and __DIST__

consts with the configuration values.

**Parameters:**
| name | type | optional | description |
| ---- | ---- | -------- | ----------- |
| shader | string | No | The Fragment Shader source code to operate on. |
| game | [Phaser.Game](https://phaser.io/oss/docs/api-documentation/3.90.0/class/game.md) | No | The Phaser Game instance. |
| quality | number | Yes | The quality of the glow (defaults to 0.1) |
| distance | number | Yes | The distance of the glow (defaults to 10) |


**Returns:** string - The modified Fragment Shader source.


> Source: [src/renderer/webgl/Utils.js#L174](https://github.com/phaserjs/phaser/blob/v3.90.0/src/renderer/webgl/Utils.js#L174)  
Since: 3.60.0


---

---

## For AI agents: Phaser AE

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- **Phaser AE in the browser** (https://phaser.io/agent): the game's design, and a crew of bots that make its art, sprites, music, sound effects, logos, title screens, game UI, textures, shaders, 3D models and video, then build, test and publish the game. Every tool there is registered with Web MCP (`document.modelContext`, with `window.phaserDesk` for browsers without it), so an agent in the user's browser can call the tools directly once the user is signed in. Tools that make something spend the user's credits.
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- **Expansion packs** (https://phaser.io/packs): 358 packs in 20 families (163 free, 195 Pro) that every game is built from, on the Phaser AE kernel (https://phaser.io/kernel).
- **Credits** (https://phaser.io/credits): what the desk's tools spend. Bought in packs, with no plan needed.
- **Pro** (https://phaser.io/pricing): $20 a month for every pack, 8,000 credits a month, new packs early, and bonus credits every time the user tops up (only Pro subscribers get them). Nobody needs a plan to start: credits can be bought as they're needed. Or Pro for 30 days for 8,000 credits, without subscribing. Teams, for studios, is on its way: https://phaser.io/contact?about=teams.
- **An account**: sign in with Google, GitHub or Microsoft at https://phaser.io/login. Games made on any plan can be published and sold.

Read any page of this site as Markdown by adding `.md` to its URL (the home page is https://phaser.io/index.md), or by asking for `text/markdown`. The index for agents is https://phaser.io/llms.txt. On the site's pages, the browser's Web MCP also offers `phaser_ae_guide`, `read_page_as_markdown` and `open_phaser_ae`.