03-16-2007
I assume you mean it is returning -1 and setting errno to EAGAIN? not that it is retuning EAGAIN
The error in fact seems to indicate that your buffers are either not large enough, or that you are writing to them too quickly and the data cannot be cleared from them before you rewrite.
Last edited by reborg; 03-16-2007 at 06:35 PM..
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GLCLEAR(3G) GLCLEAR(3G)
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 four masks are GL_COLOR_BUFFER_BIT, GL_DEPTH_BUFFER_BIT,
GL_ACCUM_BUFFER_BIT, and GL_STENCIL_BUFFER_BIT.
DESCRIPTION
glClear 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.
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 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 GETS
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
SEE ALSO
glClearAccum, glClearColor, glClearDepth, glClearIndex, glClearStencil, glColorMask, glDepthMask, glDrawBuffer, glScissor, glStencilMask
GLCLEAR(3G)