Archived

This topic is now archived and is closed to further replies.

emmai

alpha blend questions

Recommended Posts

first. I read data from backbuffer directly and alphablend with a offscreen buffer,then write back to backbuffer. it''s very slow! second. I SetRenderState(D3DRS_ALPHABLENDENABLE,TRUE),and draw the offscreen buffer in a quad using DrawPrimitive to backbuffer,it''s very fast! I know read from Video memory is very slow.but why the second is that fast???

Share this post


Link to post
Share on other sites