GLPRIORITIZETEXTURES(3G)GLPRIORITIZETEXTURES(3G)NAMEglPrioritizeTextures - set texture residence priority
C SPECIFICATION
void glPrioritizeTextures( GLsizei n,
const GLuint *textures,
const GLclampf *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.
DESCRIPTIONglPrioritizeTextures 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, glPrioritizeTextures 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 they are assigned. 0 indicates the lowest priority; textures
with priority 0 are least likely to be resident. 1 indicates the
highest priority; textures with priority 1 are most likely to be
resident. However, textures are not guaranteed to be resident until
they are used.
glPrioritizeTextures silently ignores attempts to prioritize texture 0,
or any texture name that does not correspond to an existing texture.
glPrioritizeTextures does not require that any of the textures named by
textures be bound to a texture target. glTexParameter 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.
NOTESglPrioritizeTextures 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 glPrioritizeTextures is executed
between the execution of glBegin and the corresponding execution of
glEnd.
ASSOCIATED GETS
glGetTexParameter with parameter name GL_TEXTURE_PRIORITY retrieves the
priority of a currently bound texture.
SEE ALSOglAreTexturesResident(3G), glBindTexture(3G), glCopyTexImage1D(3G),
glCopyTexImage2D(3G), glTexImage1D(3G), glTexImage2D(3G),
glTexImage3D(3G), glTexParameter(3G)
March 1, 2011
