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# docs.GL

OpenGL 3
OpenGL 2

# glPrioritizeTextures

## Name

glPrioritizeTextures — set texture residence priority

## C Specification

`void glPrioritizeTextures(` | GLsizei | n,
| const GLuint * | textures,
| const GLclampf * | priorities`)`;

## Parameters

`n`

  Specifies the number of textures to be prioritized.

`textures`

  Specifies an array containing the names of the textures to be prioritized.

`priorities`

  Specifies an array containing the texture priorities. A priority given in an element of `priorities` applies to the texture named by the corresponding element of `textures`.

## Description

`glPrioritizeTextures` assigns the `n` texture priorities given in `priorities` to the `n` textures named in `textures`.

The GL establishes a ``working set'' of textures that are resident in texture memory. These textures may be bound to a texture target much more efficiently than textures that are not resident. By specifying a priority for each texture, `glPrioritizeTextures` allows applications to guide the GL implementation in determining which textures should be resident.

The priorities given in `priorities` are clamped to the range 0 1 before they are assigned. 0 indicates the lowest priority; textures with priority 0 are least likely to be resident. 1 indicates the highest priority; textures with priority 1 are most likely to be resident. However, textures are not guaranteed to be resident until they are used.

`glPrioritizeTextures` silently ignores attempts to prioritize texture 0 or any texture name that does not correspond to an existing texture.

`glPrioritizeTextures` does not require that any of the textures named by `textures` be bound to a texture target. glTexParameter may also be used to set a texture's priority, but only if the texture is currently bound. This is the only way to set the priority of a default texture.

## Notes

`glPrioritizeTextures` is available only if the GL version is 1.1 or greater.

## Errors

`GL_INVALID_VALUE` is generated if `n` is negative.

`GL_INVALID_OPERATION` is generated if `glPrioritizeTextures` is executed between the execution of glBegin and the corresponding execution of glEnd.

## Associated Gets

glGetTexParameter with parameter name `GL_TEXTURE_PRIORITY` retrieves the priority of a currently bound texture.

## See Also

glAreTexturesResident, glBindTexture, glCopyTexImage1D, glCopyTexImage2D, glTexImage1D, glTexImage2D, glTexImage3D, 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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