glAreTexturesResident(3G)glAreTexturesResident(3G)NAMEglAreTexturesResident - determine if textures are loaded in texture
memory
SYNOPSIS
GLboolean glAreTexturesResident(
GLsizei n,
const GLuint *textures,
GLboolean *residences );
PARAMETERS
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 corre‐
sponding element of residences.
DESCRIPTION
GL establishes a ``working set'' of textures that are resident in tex‐
ture 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 resi‐
dent, 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 tex‐
tures 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_TEX‐
TURE_RESIDENT. This is the only way that the residence status of a
default texture can be queried.
NOTESglAreTexturesResident() 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 exe‐
cuted between the execution of glBegin() and the corresponding execu‐
tion of glEnd().
ASSOCIATED GETSglGetTexParameter() with parameter name GL_TEXTURE_RESIDENT retrieves
the residence status of a currently bound texture.
SEE ALSOglBindTexture(3), glGetTexParameter(3), glPrioritizeTextures(3), glTex‐
Image1D(3), glTexImage2D(3), glTexImage3D(3), glTexParameter(3)glAreTexturesResident(3G)