GL.glClear sets the bitplane area of the window to values previously selected
by GL.glClearColor, GL.glClearIndex, GL.glClearDepth,
GL.glClearStencil, and GL.glClearAccum.
Multiple color buffers can be cleared simultaneously by selecting
more than one buffer at a time using GL.glDrawBuffer.
The pixel ownership test,
the scissor test,
dithering, and the buffer writemasks affect the operation of GL.glClear.
The scissor box bounds the cleared region.
Alpha function,
blend function,
logical operation,
stenciling,
texture mapping,
and depth-buffering are ignored by GL.glClear.
GL.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_ACCUM_BUFFER_BIT
| Indicates the accumulation 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.
GL.glCallList()