Determines if textures are loaded in texture memory.
OpenGL C bindings library: libGL.a
GLboolean glAreTexturesResident(GLsizei n, const GLuint *textures, GLboolean *residences)
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.
The glAreTexturesResident subroutine 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 parameter name argument set to GL_TEXTURE_RESIDENT. This is the only way that the residence status of a default texture can be queried.
The glAreTexturesResident subroutine is not included in display lists.
The glAreTexturesResident subroutine is available only if the GL version is 1.1 or greater.
The glAreTexturesResident subroutine 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 live in virtual memory (there is no texture memory) they are considered always resident.
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. 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_EXT retrieves the residence status of a currently-bound texture.
The glBindTexture subroutine, glPrioritizeTextures subroutine, glTexImage1D subroutine, glTexImage2D subroutine, glTexParameter subroutine.