fglPrioritizeTextures(3G)

NAME
     fglPrioritizeTextures - set texture residence priority


FORTRAN SPECIFICATION
     SUBROUTINE fglPrioritizeTextures( INTEGER*4 n,
                                       CHARACTER*8 textures,
                                       CHARACTER*8 priorities )


PARAMETERS
     n           Specifies the number of textures to be prioritized.

     textures    Specifies an array containing the names of the textures to be
                 prioritized.

     priorities  Specifies an array containing the texture priorities.  A
                 priority given in an element of priorities applies to the
                 texture named by the corresponding element of textures.

DESCRIPTION
     fglPrioritizeTextures assigns the n texture priorities given in
     priorities to the n textures named in textures.

     The GL 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.  By specifying a
     priority for each texture, fglPrioritizeTextures allows applications to
     guide the GL implementation in determining which textures should be
     resident.

     The priorities given in priorities are clamped to the range [0, 1] before
     being assigned.  0 indicates the lowest priority; textures with priority
     zero are least likely to be resident.  1 indicates the highest priority;
     textures with priority one are most likely to be resident.  However,
     textures are not guaranteed to be resident until they are used.

     fglPrioritizeTextures silently ignores attempts to prioritize texture 0,
     or any texture name that does not correspond to an existing texture.

     fglPrioritizeTextures does not require that any of the textures named by
     textures be bound to a texture target.  fglTexParameter may also be used
     to set a texture's priority, but only if the texture is currently bound.
     This is the only way to set the priority of a default texture.

     fglPrioritizeTextures is included in display lists.

NOTES
     fglPrioritizeTextures is available only if the GL version is 1.1 or
     greater.
ERRORS
     GL_INVALID_VALUE is generated if n is negative.

     GL_INVALID_OPERATION is generated if fglPrioritizeTextures is executed
     between the execution of fglBegin and the corresponding execution of
     fglEnd.

ASSOCIATED GETS
     fglGetTexParameter with parameter name GL_TEXTURE_PRIORITY retrieves the
     priority of a currently bound texture.

SEE ALSO
     fglAreTexturesResident, fglBindTexture, fglCopyTexImage1D,
     fglCopyTexImage2D, fglTexImage1D, fglTexImage2D, fglTexParameter