glAreTexturesResident man page on Oracle

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GLARETEXTURESRESIDEN(3G)	 OpenGL Manual	      GLARETEXTURESRESIDEN(3G)

NAME
       glAreTexturesResident - determine if textures are loaded in texture
       memory

C SPECIFICATION
       GLboolean glAreTexturesResident(GLsizei n, const GLuint * textures,
				       GLboolean * residences);

PARAMETERS
       n
	   Specifies the number of textures to be queried.

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

       residences
	   Specifies an array in which the texture residence status is
	   returned. The residence status of a texture named by an element of
	   textures is returned in the corresponding element of residences.

DESCRIPTION
       GL establishes a ``working set'' of textures that are resident in
       texture memory. These textures can be bound to a texture target much
       more efficiently than textures that are not resident.

       glAreTexturesResident queries the texture residence status of the n
       textures named by the elements of textures. If all the named textures
       are resident, glAreTexturesResident returns GL_TRUE, and the contents
       of residences are undisturbed. If not all the named textures are
       resident, glAreTexturesResident returns GL_FALSE, and detailed status
       is returned in the n elements of residences. If an element of
       residences is GL_TRUE, then the texture named by the corresponding
       element of textures is resident.

       The residence status of a single bound texture may also be queried by
       calling glGetTexParameter() with the target argument set to the target
       to which the texture is bound, and the pname argument set to
       GL_TEXTURE_RESIDENT. This is the only way that the residence status of
       a default texture can be queried.

NOTES
       glAreTexturesResident is available only if the GL version is 1.1 or
       greater.

       glAreTexturesResident returns the residency status of the textures at
       the time of invocation. It does not guarantee that the textures will
       remain resident at any other time.

       If textures reside in virtual memory (there is no texture memory), they
       are considered always resident.

       Some implementations may not load a texture until the first use of that
       texture.

ERRORS
       GL_INVALID_VALUE is generated if n is negative.

       GL_INVALID_VALUE is generated if any element in textures is 0 or does
       not name a texture. In that case, the function returns GL_FALSE and the
       contents of residences is indeterminate.

       GL_INVALID_OPERATION is generated if glAreTexturesResident is executed
       between the execution of glBegin() and the corresponding execution of
       glEnd().

ASSOCIATED GETS
       glGetTexParameter() with parameter name GL_TEXTURE_RESIDENT retrieves
       the residence status of a currently bound texture.

SEE ALSO
       glBindTexture(), glGetTexParameter(), glPrioritizeTextures(),
       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
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  04/29/2014	      GLARETEXTURESRESIDEN(3G)
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