> For the complete documentation index, see [llms.txt](https://nswamy14.gitbook.io/i2djs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nswamy14.gitbook.io/i2djs/api-reference/webgl-api.md).

# WebGL additional features

I2Djs webGL layer is for high scale performance rendering. I2Djs provides an intuitive API to render elements on large scale. However,  WebGL Layer API has a minor deviation in terms of element creation, for performance reason.

To render any geometrical element, we need to load the respective shader. So for that reason, we create a shader group of the respective 'shaderType' and then create elements under it. For example, to create rectangles, we need to create 'rect' shader group and then add rect elements.

**Code block to create rects.**

```
let rectGroup = webGlLayerInstance.createEl({
					el: 'group',
					attr: {
						shaderType: 'rect'
					}
				}).createEl({
					el: 'rect':
					attr: {
						x: 100,
						y: 100,
						width: 250,
						height: 250
					},
					style: {
						fill: 'hsl(35%, 100%, 0%)';
					}
				});
```

## Shapes Supported:

I2Djs WebGL has a pseudo-DOM implementation for most of the geometrical primitives. In addition, it provides a way to define the custom shaders and the way to feed the data to the attributes, uniforms, textures.

Below is the list of built-in elements.

| Element  | ShaderType | attributes          | Style  |
| -------- | ---------- | ------------------- | ------ |
| rect     | Rect       | x, y, width, height | fill   |
| point    | point      | x, y, size          | fill   |
| line     | line       | x1, y1, x2, y2      | stroke |
| circle   | circle     | cx, cy, r           | fill   |
| polyline | polyline   | d                   | stroke |
| polygon  | polygon    | d                   | fill   |
| image    | image      | x, y, width, height |        |

### Custom Elements:

Sometimes there may be a need to create custom elements/effects, which are not included in the built-in options. To create custom elements, I2Djs provides an easy API to create custom shaders with the inbuild geometrical API.

### Custom Shaders:

{% embed url="<https://codepen.io/nswamy14/pen/XWbVZqP>" %}

## Events:

**Work in progress**


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://nswamy14.gitbook.io/i2djs/api-reference/webgl-api.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.