WebGL is an API for rendering graphics in web browsers, which is based on the functionality of the OpenGL ES graphics library. WebGLA JavaScript API that renders 2D and 3D graphics in a web browser. The Unity Web build option allows Unity to publish content as JavaScript programs which use HTML5 technologies and the WebGL rendering API to run Unity content in a web browser. More info
See in Glossary 2.0 (WebGL2) is the version of WebGL that Unity supports. WebGL2 almost matches with the OpenGL ES 3.0 functionality.
There are multiple benefits to using the WebGL2 graphics API. WebGL2 is widely accepted by most browsers and is the default Web graphics API in Unity.
Browsers with WebGL 2.0 support have the following advantages:
There are best practice recommendations and restrictions for working with WebGL2:
By default, Unity Web clears the drawing buffer after each frame, which means the content of the frame buffer clears regardless of the Camera.clearFlags setting. However, you can change this behavior at instantiation time. To do this, set webglContextAttributes.preserveDrawingBuffer
to true
in the index.html
file of your Web template.
Note : If you set any WebGL context attributes, you must also add a line to preserve the Power Preference Player setting.
script.onload = () => {
config['webglContextAttributes'] = {
preserveDrawingBuffer: true, //Add this line to preserve the Camera.clearFlags setting
powerPreference: {{{ WEBGL_POWER_PREFERENCE }}} //Add this line to preserve the Power Preference Player setting
};
createUnityInstance(canvas, config, (progress) => {
WebGL supports anti-aliasing on most (but not on all) combinations of browsers and GPUs. Anti-aliasing softens jagged edges in your sceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
See in Glossary.
To enable anti-aliasing:
Go to the Quality Settings (menu: Edit > Project Settings, then select the Quality category).
In the Rendering section, make sure Anti Aliasing isn’t set to Disabled.
For more information about anti-aliasing, refer to the Anti-aliasing documentation and Quality Settings.
The WebGL 2.0 specification imposes some limitations on OpenGL Shading Language (GLSL) shader code. This is mainly relevant if you write your own shaders.
Precision qualifiers
WebGL 2.0 requires you to specify the precision of all variables in the shader. You can use highp
, mediump
, or lowp
to specify the precision of the variable. If you don’t specify the precision, the shader will use the default precision, which is mediump
. You can also use precision to specify the precision of a block of variables.
There are recommendations relevant to both web graphics APIs. For more information, refer to Recommendations for both WebGL2 and WebGPU graphics APIs.
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