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# docs.GL

OpenGL 4
OpenGL 3
OpenGL 2
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# glActiveTexture

## 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 48. `texture` must be one of `GL_TEXTUREi`, where i ranges from 0 (`GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS` - 1). 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 48.

## Errors

`GL_INVALID_ENUM` is generated if `texture` is not one of `GL_TEXTUREi`, where i ranges from 0 to (`GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS` - 1).

## Associated Gets

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

## Tutorials

open.gl - Textures Objects and Parameters
opengl-tutorial.org - Tutorial 13 : Normal Mapping

## 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. This document is licensed under the SGI Free Software B License. For details, see https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/.

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