GLARETEXTURESRESIDENTEXT()

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, not part of the core GL command set. If GL_EXT_texture_object is included in the string returned by glGetString, when called with argument GL_EXTENSIONS, extension EXT_texture_object is supported by the connection.

ERRORS

GL_INVALID_VALUE is generated if n is negative.

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.

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