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Table of Contents
glPrioritizeTextures - set texture residence priority
void
glPrioritizeTextures( GLsizei n,
const GLuint *textures,
const GLclampf *priorities )
- 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.
glPrioritizeTextures 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.
glPrioritizeTextures
is available only if the GL version is 1.1 or greater.
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.
glGetTexParameter with parameter name GL_TEXTURE_PRIORITY
retrieves the priority of a currently bound texture.
glAreTexturesResident(3G)
,
glBindTexture(3G)
, glCopyTexImage1D(3G)
, glCopyTexImage2D(3G)
, glTexImage1D(3G)
,
glTexImage2D(3G)
, glTexImage3D(3G)
, glTexParameter(3G)
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