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friends can do this from unix AIX
I need to ask for a file that does not exist
then if file.txt
*
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You can sucedere that the file does not exist (2 Replies)
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GLPRIORITIZETEXTURES(3G) OpenGL Manual GLPRIORITIZETEXTURES(3G)
NAME
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.
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(), glBindTexture(), glCopyTexImage1D(), glCopyTexImage2D(), glTexImage1D(), glTexImage2D(), glTexImage3D(),
glTexParameter()
COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 06/10/2014 GLPRIORITIZETEXTURES(3G)