glPrioritizeTextures man page on DigitalUNIX

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glPrioritizeTextures(3G)			      glPrioritizeTextures(3G)

NAME
       glPrioritizeTextures - 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.

DESCRIPTION
       glPrioritizeTextures() 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.

NOTES
       glPrioritizeTextures() 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 ALSO
       glAreTexturesResident(3),    glBindTexture(3),	  glCopyTexImage2D(3),
       glCopyTexImage1D(3), glTexImage1D(3), glTexImage2D(3), glTexImage3D(3),
       glTexParameter(3)

						      glPrioritizeTextures(3G)
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