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5551 format and double buffering

 
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seventh



Joined: 21 Jan 2006
Posts: 11
PostPosted: Sat Jan 21, 2006 7:25 pm    Post subject: 5551 format and double buffering Reply with quote
Hello all

I read forum's archives, and found no information about this problem.
I'm trying to do double buffering. I succedeed to do that in 8888 format with IMMEDIATE frame buffer swapping :

Code:

  sceDisplayWaitVblankStart();
  sceDisplaySetFrameBuf( pVram,
                                        BUF_WIDTH,
                                        PSP_DISPLAY_PIXEL_FORMAT_8888,
                                        PSP_DISPLAY_SETBUF_IMMEDIATE );
  // pVram swap


But, as I try to do the same thing in 5551 format, I have to write the following :

Code:

 sceDisplaySetFrameBuf( pVram,
                                        BUF_WIDTH,
                                        PSP_DISPLAY_PIXEL_FORMAT_5551,
                                        PSP_DISPLAY_SETBUF_NEXTFRAME );
  sceDisplayWaitVblankStart();
  // pVram swap


If I don't do like this (IMMEDIATE swapping for example), I have very strange behavior. I think that using NEXTFRAME swapping and waiting after setting the frame buffer is making me slowing by a factor two animation.

Can someone explain me this strange behavior ? Where am I wrong ?
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jsgf



Joined: 12 Jul 2005
Posts: 254
PostPosted: Sun Jan 22, 2006 7:28 am    Post subject: Reply with quote
I found a similar thing in PSPGL. IMMEDIATE just didn't work as expected, so I ended up having to use NEXTFRAME. I don't see this as halving the framerate though. Also, I haven't noticed the framebuffer format making a difference.
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