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

VERSION SUPPORT

       ┌─────────┬───────────────────────────────────────────────────────────────────────┐
       │         │                OpenGL Version                                         │
       ├─────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │/        │     │     │     │     │     │     │     │     │     │     │     │     │
       │Feature  │     │     │     │     │     │     │     │     │     │     │     │     │
       │Name     │     │     │     │     │     │     │     │     │     │     │     │     │
       ├─────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │glClear  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
       └─────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘

SEE ALSO

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

COPYRIGHT

       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

       Copyright © 1991-2006 Silicon Graphics, Inc.
       Copyright © 2010-2014 Khronos Group

[FIXME: source]                             01/03/2018                                GLCLEAR(3G)