Signature
glAreTexturesResident(
GLsizei (
n
)
,
const GLuint * (
textures
)
,
GLboolean * (
residences
)
)-> GLboolean
glAreTexturesResident(
n
,
textures
,
residences
)
-> <class 'ctypes.c_ubyte'>
Allow both Pythonic and C-style calls to glAreTexturesResident
glAreTexturesResident( arrays.GLuintArray( textures) )
or
glAreTexturesResident( int(n), arrays.GLuintArray( textures), arrays.GLuboolean( output) )
or
glAreTexturesResident( int(n), arrays.GLuintArray( textures) )
returns the output arrays.GLubooleanArray
Parameters
| Variables | Description |
|---|---|
| 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
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/
.
Sample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.
glAreTexturesResident