Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: mperdue@iquest.net (Mario Perdue)
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: Simple Exmaple of GsBG usage wanted
Date: Wed, 23 Apr 1997 15:09:43 GMT
Organization: SCEA Net Yaroze News
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On Tue, 22 Apr 1997 16:48:48 -0500, Ed Federmeyer
<fedeedw@charlie.cns.iit.edu> wrote:

Ed,

I've taken a quick look at what you are doing and I did notice one
problem. Where you draw the GsBG object is misplaced. The sequencing
should go like this:

1) Get the active buffer
2) Set the work base
3) Sort the objects to be displayed
4) Draw Sync
5) VSync
6) Swap Buffer
7) Sort Clear
8) Draw OT

So your do loop should look a bit more like this:

do
  {
  outputBufferIndex = GsGetActiveBuff();
  GsSetWorkBase((PACKET*)GpuOutputPacket[outputBufferIndex]);
  GsClearOt(0, 0,&WorldOrderingTable[outputBufferIndex]);

  GsSortFixBg16( &bg, &bg_work_area[0],
&WorldOrderingTable[outputBufferIndex], 1000);

  DrawSync(0);
  VSync(0);

  GsSwapDispBuff();
  GsSortClear( 0x0, 0x0, 0x0, &WorldOrderingTable[outputBufferIndex]);
  GsDrawOt( &WorldOrderingTable[outputBufferIndex] );

  pad_data = PadRead();

  } while ( !(pad_data & PADselect) );


I don't know if there are other problem, but you should get something
displayed on the screen after you fix this. If you need more help,
just shout.

Mario