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glAreTexturesResident(3G)
Contents
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glAreTexturesResident - determine if textures are loaded
in texture memory
GLboolean glAreTexturesResident(
GLsizei n,
const GLuint *textures,
GLboolean *residences );
Specifies the number of textures to be queried. Specifies
an array containing the names of the textures to be
queried. 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.
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.
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.
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().
glGetTexParameter() with parameter name GL_TEXTURE_RESIDENT
retrieves the residence status of a currently bound
texture.
glBindTexture(3), glGetTexParameter(3), glPrioritizeTextures(3), glTexImage1D(3), glTexImage2D(3), glTexImage3D(3), glTexParameter(3)
glAreTexturesResident(3G)
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