A little doubt regarding setgid and Unix access right flags. Post: 302404968

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LEARN ABOUT CENTOS

glclear

GLCLEAR(3G)							   OpenGL Manual						       GLCLEAR(3G)

NAME

       glClear - clear buffers to preset values

C SPECIFICATION

       void glClear(GLbitfield mask);

PARAMETERS

       mask
	   Bitwise OR of masks that indicate the buffers to be cleared. The three masks are GL_COLOR_BUFFER_BIT, GL_DEPTH_BUFFER_BIT, and
	   GL_STENCIL_BUFFER_BIT.

DESCRIPTION

       glClear sets the bitplane area of the window to values previously selected by glClearColor, glClearDepth, and glClearStencil. Multiple
       color buffers can be cleared simultaneously by selecting more than one buffer at a time using glDrawBuffer().

       The pixel ownership test, the scissor test, dithering, and the buffer writemasks affect the operation of glClear. The scissor box bounds
       the cleared region. Alpha function, blend function, logical operation, stenciling, texture mapping, and depth-buffering are ignored by
       glClear.

       glClear takes a single argument that is the bitwise OR of several values indicating which buffer is to be cleared.

       The values are as follows:

       GL_COLOR_BUFFER_BIT
	   Indicates the buffers currently enabled for color writing.

       GL_DEPTH_BUFFER_BIT
	   Indicates the depth buffer.

       GL_STENCIL_BUFFER_BIT
	   Indicates the stencil buffer.

       The value to which each buffer is cleared depends on the setting of the clear value for that buffer.

NOTES

       If a buffer is not present, then a glClear directed at that buffer has no effect.

ERRORS

       GL_INVALID_VALUE is generated if any bit other than the three defined bits is set in mask.

ASSOCIATED GETS

       glGet() with argument GL_DEPTH_CLEAR_VALUE

       glGet() with argument GL_COLOR_CLEAR_VALUE

       glGet() with argument GL_STENCIL_CLEAR_VALUE

SEE ALSO

       glClearColor, glClearDepth, glClearStencil, glColorMask(), glDepthMask(), glDrawBuffer(), glScissor(), glStencilMask()

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							       GLCLEAR(3G)

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