glAreTexturesResident(3G)      OpenGL Reference	     glAreTexturesResident(3G)

NAME    [Toc]    [Back]

     glAreTexturesResident - determine if textures are loaded in texture
     memory

C SPECIFICATION    [Toc]    [Back]

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

PARAMETERS    [Toc]    [Back]

     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    [Toc]    [Back]

     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    [Toc]    [Back]

     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.






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glAreTexturesResident(3G)      OpenGL Reference	     glAreTexturesResident(3G)



     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    [Toc]    [Back]

     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    [Toc]    [Back]

     glGetTexParameter with parameter name GL_TEXTURE_RESIDENT retrieves the
     residence status of a currently bound texture.

SEE ALSO    [Toc]    [Back]

     glBindTexture, glGetTexParameter, glPrioritizeTextures, glTexImage1D,
     glTexImage2D, glTexImage3D, glTexParameter


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