glPrioritizeTextures(3G)glPrioritizeTextures(3G)NAMEglPrioritizeTextures - set texture residence priority
SYNOPSIS
void glPrioritizeTextures(
GLsizei n,
const GLuint *textures,
const GLclampf *priorities );
PARAMETERS
Specifies the number of textures to be prioritized. Specifies an array
containing the names of the textures to be prioritized. 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 prior‐
ities 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 high‐
est 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 GETSglGetTexParameter() with parameter name GL_TEXTURE_PRIORITY retrieves
the priority of a currently bound texture.
SEE ALSOglAreTexturesResident(3), glBindTexture(3), glCopyTexImage2D(3),
glCopyTexImage1D(3), glTexImage1D(3), glTexImage2D(3), glTexImage3D(3),
glTexParameter(3)glPrioritizeTextures(3G)