[4/4 try 3] wined3d: Make FBO draw buffer selection in ActivateContext

Allan Tong actong88 at gmail.com
Thu Dec 20 23:29:28 CST 2007

This merges FBO draw buffer selection into ActivateContext.  The
behavior for offscreen rendering depends on the specified context
usage.  For CTXUSAGE_DRAWPRIM and CTXUSAGE_CLEAR, apply_fbo_state is
used to apply the render target state.  For CTXUSAGE_BLIT, the target
surface is attached to dst_fbo and used as the drawable.  Nothing is
done for CTXUSAGE_RESOURCELOAD.  Along with the previous patch, the
incomplete FBO error in the ddraw visual test that appeared in my
previous try should not happen anymore.

 - Allan
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