fglAreTexturesResidentEXT(3G)

NAME
     fglAreTexturesResidentEXT - determine if textures are loaded in texture
     memory


FORTRAN SPECIFICATION
     LOGICAL*1 fglAreTexturesResidentEXT( INTEGER*4 n,
                                          CHARACTER*8 textures,
                                          CHARACTER*8 residences )


PARAMETERS
     n           The number of textures to be queried.

     textures    An array containing the names of the textures to be queried.

     residences  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
     On machines with a limited amount of texture memory, OpenGL 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.

     fglAreTexturesResidentEXT queries the texture residence status of the n
     textures named by the elements of textures.  If all the named textures
     are resident, fglAreTexturesResidentEXT returns GL_TRUE and the contents
     of residences are undisturbed.  If not all the named textures are
     resident, fglAreTexturesResidentEXT 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 fglGetTexParameter with the target argument set to the target to
     which the texture is bound, and the parameter name argument set to
     GL_TEXTURE_RESIDENT_EXT.  This is the only way that the residence status
     of a default texture can be queried.

     fglAreTexturesResidentEXT is not included in display lists.

NOTES
     fglAreTexturesResidentEXT is part of the EXT_texture_object extension.
     See fglIntro for more information about using extensions.

ERRORS
     GL_INVALID_VALUE is generated if n is negative.
     GL_INVALID_VALUE is generated if any element in textures is zero or does
     not name a texture.

     GL_INVALID_OPERATION is generated if fglAreTexturesResidentEXT is
     executed between the execution of fglBegin and the corresponding
     execution of fglEnd.

ASSOCIATED GETS
     fglGetTexParameter with parameter name GL_TEXTURE_RESIDENT_EXT retrieves
     the residence status of a currently-bound texture.


SEE ALSO
     fglBindTextureEXT, fglPrioritizeTexturesEXT, fglTexImage1D,
     fglTexImage2D, fglTexImage3DEXT, fglTexParameter.