GLCLEAR - Online Linux Manual PageSection : 3G
NAME"glClear − clear buffers to preset values
C SPECIFICATIONvoid glClear( GLbitfield mask )
PARAMETERSmask  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.
DESCRIPTION­glClear sets the bitplane area of the window to values previously 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.
NOTESIf a buffer is not present, then a ­glClear directed at that buffer has no effect.
ERRORS­GL_INVALID_VALUE is generated if any bit other than the four defined bits is set in mask. ­GL_INVALID_OPERATION is generated if ­glClear is executed between the execution of ­glBegin and the corresponding execution of ­glEnd.
ASSOCIATED GETS­glGet 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
SEE ALSO­glClearAccum(3G), ­glClearColor(3G), ­glClearDepth(3G), ­glClearIndex(3G), ­glClearStencil(3G), ­glColorMask(3G), ­glDepthMask(3G), ­glDrawBuffer(3G), ­glScissor(3G), ­glStencilMask(3G) 0
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