glAreTexturesResidentEXT(3G) OpenGL Reference 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.
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glAreTexturesResidentEXT(3G) OpenGL Reference glAreTexturesResidentEXT(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 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.
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