On 1/18/2012 11:19 AM, Brian Paul wrote:
On 01/18/2012 09:01 AM, Dee Sharpe wrote:
While implementing Clear() for a platform, which buffers in GLContext
need to be cleared out of the list of:
DrawBuffer
ReadBuffer
WinSysDrawBuffer
WinSysReadBuffer
Or do they all need to be cleared?
Clearing effects "draw" buffers, not "read" buffers.
Unless a user-created FBO is bound, ctx->WinSysDrawBuffer ==
ctx->DrawBuffer.
You need to clear the color buffers attached to ctx->DrawBuffer. The
number of buffers to clear is ctx->DrawBuffer->_NumColorDrawBuffers
and the indexes/pointers to the renderbuffers is in
_ColorDrawBufferIndexes[] and _ColorDrawBuffers[].
I may actually get rid of the later (redundant) array and just write a
helper function that returns a pointer to a renderbuffer given a
buffer index.
Thanks for the quick reply. So, if I want to directly access the
renderbuffer that I designated as the front left buffer, then I need to
use _ColorDrawBuffers[BUFFER_FRONT_LEFT], correct?
--
Dee Sharpe
The difference between what IS done
& what COULD be done is relational to
what you ARE doing& what you COULD be doing!
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