GLARETEXTURESRESIDENTUNIX Programmer's MGLARETEXTURESRESIDENT(3G)
glAreTexturesResident - determine if textures are loaded in
texture memory
GLboolean glAreTexturesResident( GLsizei n,
const GLuint *textures,
GLboolean *residences )
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 tex-
tures 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 undis-
turbed. 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 argu-
ment 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
MirOS BSD #10-current Printed 20.2.2012 1
GLARETEXTURESRESIDENTUNIX Programmer's MGLARETEXTURESRESIDENT(3G)
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 indeter-
minate.
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(3G), glGetTexParameter(3G),
glPrioritizeTextures(3G), glTexImage1D(3G),
glTexImage2D(3G), glTexImage3D(3G), glTexParameter(3G)
MirOS BSD #10-current Printed 20.2.2012 2
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