The WebGLRenderingContext.activeTexture()
method of the WebGL API specifies which texture unit to make active.
Syntax
void gl.activeTexture(texture);
Parameters
texture
- The texture unit to make active. The value is a
gl.TEXTUREI
where I is within the range from 0 togl.MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1
.
Return value
None.
Exceptions
If texture is not one of gl.TEXTUREI
, where I is within the range from 0 to gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1
, a gl.INVALID_ENUM
error is thrown.
Examples
The following call selects gl.TEXTURE1
as the current texture. Subsequent calls that modify the texture state will affect this texture.
gl.activeTexture(gl.TEXTURE1);
The number of texture units is implementation dependent, you can get this number with the help of the MAX_COMBINED_TEXTURE_IMAGE_UNITS
constant. It is, per specification, at least 8.
gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS);
To get the active texture, query the ACTIVE_TEXTURE
constant.
gl.activeTexture(gl.TEXTURE0); gl.getParameter(gl.ACTIVE_TEXTURE); // returns "33984" (0x84C0, gl.TEXTURE0 enum value)
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 1.0 The definition of 'activeTexture' in that specification. |
Recommendation | Initial definition. |
OpenGL ES 2.0 The definition of 'glActiveTexture' in that specification. |
Standard | Man page of the OpenGL API. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Firefox | Edge | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic Support | 9 | 4.0 | 12 | 11 | 12 | 5.1 |
Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic Support | (Yes) | 25 | (Yes) | (Yes) | 11 | 12 | 8.1 |