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Table of Contents
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 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(3G)
,
glGetTexParameter(3G)
, glPrioritizeTextures(3G)
, glTexImage1D(3G)
, glTexImage2D(3G)
,
glTexImage3D(3G)
, glTexParameter(3G)
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