01-25-2012
Thanks. That cleared it up!
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Hi,
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******************
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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)