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.
clear buffers to preset values
open.gl - Depth and Stencil Buffers
opengl-tutorial.org - Tutorial 4 : A Colored Cube
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glClearsets the bitplane area of the window to values previously selected byglClearColor,glClearDepth, andglClearStencil. 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 byglClear.glCleartakes 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.