glAreTexturesResidentEXT(3G)

NAME
     glAreTexturesResidentEXT - determine if textures are loaded in texture
     memory


C SPECIFICATION
     GLboolean glAreTexturesResidentEXT( GLsizei n,
                                         const GLuint *textures,
                                         GLboolean *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.

     glAreTexturesResidentEXT queries the texture residence status of the n
     textures named by the elements of textures.  If all the named textures
     are resident, glAreTexturesResidentEXT returns GL_TRUE and the contents
     of residences are undisturbed.  If not all the named textures are
     resident, glAreTexturesResidentEXT 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 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.

     glAreTexturesResidentEXT is not included in display lists.

NOTES
     glAreTexturesResidentEXT is part of the EXT_texture_object extension.
     See glIntro 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 glAreTexturesResidentEXT is executed
     between the execution of glBegin and the corresponding execution of
     glEnd.

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


SEE ALSO
     glBindTextureEXT, glPrioritizeTexturesEXT, glTexImage1D, glTexImage2D,
     glTexImage3DEXT, glTexParameter.