glClear - clear buffers to preset values
void glClear(GLbitfield 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.
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 takes a single argument that is the bitwise OR of
several values indicating which buffer is to be cleared.
The values are as follows:
Indicates the buffers currently enabled for color
Indicates the depth buffer.
Indicates the stencil buffer.
The value to which each buffer is cleared depends on the setting
of the clear value for that buffer.
If a buffer is not present, then a glClear directed at that buffer has no
GL_INVALID_VALUE is generated if any bit other than the three defined
bits is set in mask.
glGet() with argument GL_DEPTH_CLEAR_VALUE
glGet() with argument GL_COLOR_CLEAR_VALUE
glGet() with argument GL_STENCIL_CLEAR_VALUE
glClearColor, glClearDepth, glClearStencil,
glColorMask(), glDepthMask(), glDrawBuffer(),
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014
Khronos Group. This document is licensed under the SGI Free Software B
License. For details, see http://oss.sgi.com/projects/FreeB/.
Copyright © 1991-2006 Silicon Graphics, Inc.
|Function / Feature Name
Copyright © 2010-2014 Khronos Group