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OpenGL 1.1 for AIX: Reference Manual

glPrioritizeTextures Subroutine


Sets texture residence priority.


OpenGL C bindings library: libGL.a

C Syntax

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.


The glPrioritizeTextures subroutine assigns the n texture priorities given in priorities to the n textures named in textures.

On machines with a limited amount of texture memory, 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 [0.0, 1.0] before being assigned. Zero indicates the lowest priority; textures with priority zero are least likely to be resident. One 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 bound.

The glPrioritizeTextures subroutine silently ignores attempts to prioritize texture zero, or any texture name that does not correspond to an existing texture.

The glPrioritizeTextures subroutine does not require that any of the textures named by textures be bound to a texture target. It can also be used to set the priority of a texture, but only if the texture is currently bound. This is the only way to set the priority of a default texture.

The glPrioritizeTextures subroutine is included in display lists.


The glPrioritizeTextures subroutine 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.

Associated Gets

glGetTexParameter with parameter name GL_TEXTURE_PRIORITY retrieves the priority of a currently bound texture.

Related Information

The glAreTexturesResident subroutine, glBindTexture subroutine, glTexImage1D subroutine, glTexImage2D subroutine, glTexImage3DEXT subroutine, glTexParameter subroutine.

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