## Name

glActiveTexture — select active texture unit

## C Specification

`void glActiveTexture(` | GLenum texture`)`;

## Parameters

`texture`

  Specifies which texture unit to make active. The number of texture units is implementation dependent, but must be at least 80. `texture` must be one of `GL_TEXTURE` i, where i ranges from zero to the value of `GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS` minus one. The initial value is `GL_TEXTURE0`.

## Description

`glActiveTexture` selects which texture unit subsequent texture state calls will affect. The number of texture units an implementation supports is implementation dependent, but must be at least 80.

## Errors

`GL_INVALID_ENUM` is generated if `texture` is not one of `GL_TEXTURE` i, where i ranges from zero to the value of `GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS` minus one.

## Associated Gets

glGet with argument `GL_ACTIVE_TEXTURE`, or `GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS`.

## Version Support

| OpenGL Version
--- | ---
Function / Feature Name | 2.0 | 2.1 | 3.0 | 3.1 | 3.2 | 3.3 | 4.0 | 4.1 | 4.2 | 4.3 | 4.4 | 4.5
`glActiveTexture` | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## See Also

glGenTextures, glBindTexture, glCompressedTexImage1D, glCompressedTexImage2D, glCompressedTexImage3D, glCompressedTexSubImage1D, glCompressedTexSubImage2D, glCompressedTexSubImage3D, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, glDeleteTextures glIsTexture, glTexImage1D, glTexImage2D, glTexImage2DMultisample, glTexImage3D, glTexImage3DMultisample, glTexSubImage1D, glTexSubImage2D, glTexSubImage3D, glTexParameter,

## Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.