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glPrioritizeTextures

Chapter 14

346

glPrioritizeTextures

glPrioritizeTextures: 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.

Description

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.

Notes

glPrioritizeTextures is available only if the GL version is 1.1 or greater.

HP b2600 Reference Guide

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