fglAreTexturesResidentEXT(3G) OpenGL Reference 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.
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fglAreTexturesResidentEXT(3G) OpenGL Reference fglAreTexturesResidentEXT(3G)
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.
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