GLCLEAR(3G) UNIX Programmer's Manual GLCLEAR(3G)
glClear - clear buffers to preset values
void glClear( GLbitfield mask )
mask Bitwise OR of masks that indicate the buffers to be
cleared. The four masks are GL_COLOR_BUFFER_BIT,
GL_DEPTH_BUFFER_BIT, GL_ACCUM_BUFFER_BIT, and
GL_STENCIL_BUFFER_BIT.
glClear sets the bitplane area of the window to values pre-
viously selected by glClearColor, glClearIndex,
glClearDepth, glClearStencil, and glClearAccum. 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_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.
If a buffer is not present, then a glClear directed at that
buffer has no effect.
GL_INVALID_VALUE is generated if any bit other than the four
defined bits is set in mask.
MirOS BSD #10-current Printed 20.2.2012 1
GLCLEAR(3G) UNIX Programmer's Manual GLCLEAR(3G)
GL_INVALID_OPERATION is generated if glClear is executed
between the execution of glBegin and the corresponding exe-
cution of glEnd.
glGet with argument GL_ACCUM_CLEAR_VALUE
glGet with argument GL_DEPTH_CLEAR_VALUE
glGet with argument GL_INDEX_CLEAR_VALUE
glGet with argument GL_COLOR_CLEAR_VALUE
glGet with argument GL_STENCIL_CLEAR_VALUE
glClearAccum(3G), glClearColor(3G), glClearDepth(3G),
glClearIndex(3G), glClearStencil(3G), glColorMask(3G),
glDepthMask(3G), glDrawBuffer(3G), glScissor(3G),
glStencilMask(3G)
MirOS BSD #10-current Printed 20.2.2012 2
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