Path: chuka.playstation.co.uk!scea!greg_labrec@interactive.sony.com
From: "Linda J. Hodge" <hodgke@earthlink.net>
Newsgroups: scea.yaroze.programming.2d_graphics
Subject: Re: Coding  ?
Date: Sat, 19 Jul 1997 19:06:09 -0700
Organization: SCEA Net Yaroze News
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Mario Perdue wrote:
> 
> First of all, I like to ask if your name is Linda or Austin? I've been
> assuming that your name is Linda because of the name on the tag line.
> If your name is really Austin, I appologize for all the times I've
> called you Linda.
> 
> Anyway, Linda/Austin, here's my answer.
> 
> On Sat, 19 Jul 1997 13:16:40 -0700, "Linda J. Hodge"
> <hodgke@earthlink.net> wrote:
> 
> >What is wrong with this source code?It is supposed to display a bunch of
> >colored lines.
> >
> >/********************************************************
> > *                                                      *
> > *                                                      *
> > *   LINES!!!!                                          *
> > *                                                      *
> > *  By Austin Kottke                                    *
> > *******************************************************/
> >
> >
> >       // include libraries
> >#include <libps.h>
> >
> >#include "pad.h"
> >
> >
> >       // constants
> >
> >       // GPU packet space
> >#define PACKETMAX               (10000)
> >#define PACKETMAX2              (PACKETMAX*24)
> >
> >       // size of ordering table: 2 << OT_LENGTH
> >       // i.e. 16384 levels of z resolution
> >#define OT_LENGTH               1
> >
> >
> >       // globals
> >
> >       // Ordering Table handlers
> >GsOT            WorldOrderingTable[2];
> >       // actual Ordering Tables themselves
> >GsOT_TAG        zSortTable[2][1<<OT_LENGTH];
> >       // GPU packet work area
> >PACKET          GpuOutputPacket[2][PACKETMAX2];
> >
> >
> >
> >       // main function
> >       // see pad.h and pad.c for the controller pad interface
> >
> >int main (void)
> >{
> >       u_long PadStatus = 0;           // state of controller pad
> >       TheBuff;                          // which buffer is active (drawn on)
> 
> It might be nice to tell the compiler what type of variable TheBuff
> is.
>         int             TheBuff;
> 
> >       GsGLINE          *sp;           //Line drawing function,the sp bites!
> >       int index;
> >               // initialisation
> >       SetVideoMode( MODE_NTSC );      // NTSC mode
> >
> >       // screen resolution 640 by 480,
> >
> >       GsInitGraph(640 ,480, 4, 0, 0);
> >       GsDefDispBuff(0, 0, 0, 480);
> 
> For now, I'd use a resolution of 320x240. If you want, you can try a
> higher res later.
> 
>         GsInitGraph(320, 240, 4, 0, 0);
>         GsDefDispBuff(0, 0, 0, 240);
> 
> >               // set up the controller pad
> >       PadInit();
> 
> You havn't shown the PadInit() function here, so I assume it works.
> 
> >               // set up the ordering table handlers
> >       WorldOrderingTable[0].length = OT_LENGTH;
> >       WorldOrderingTable[1].length = OT_LENGTH;
> >       WorldOrderingTable[0].org = zSortTable[0];
> >       WorldOrderingTable[1].org = zSortTable[1];
> >
> >       for (;;)                        // main loop
> >               {
> >                       // find status of controller pad
> >               PadStatus = PadRead();
> 
> You also havn't shown the PadRead() function here, so I assume it
> works too.
> 
> >                       // if 'select' pressed, exit main loop
> >               if (PadStatus & PADselect)
> >                       break;
> >
> >                       // find which buffer is active
> >               TheBuff = GsGetActiveBuff();
> >
> >                       // set address for GPU scratchpad area
> >               GsSetWorkBase( (PACKET*)GpuOutputPacket[TheBuff]);
> >
> >                       // clear the ordering table
> >               GsClearOt(0, 0, &WorldOrderingTable[TheBuff]);
> >
> >                     //The program !!!
> >               for(index=0;index<1000;index++)
> >               {      sp->attribute = 0;      //This is the core of the program
> >                                              //which is pretty basic.
> >                      sp->x0 = rand()%640;
> >                      sp->y0 = rand()%480;
> >                      sp->x1 = rand()%640;
> >                      sp->y1 = rand()%480;
> 
> Change for new screen size.
> 
>                        sp->x0 = rand()%320;
>                        sp->y0 = rand()%240;
>                        sp->x1 = rand()%320;
>                        sp->y1 = rand()%240;
> 
> >                      sp->r0 = sp->g0 = sp->b0 = rand()%16;
> >                      sp->r1 = sp->g1 = sp->b1 = rand()%16;
> 
> The way this is written you will get 16 shades of very dark grey. I
> think you probably want something more like this.
> 
>                         sp->r0 = rand()%256;
>                         sp->g0 = rand()%256;
>                         sp->b0 = rand()%256;
>                         sp->r1 = rand()%256;
>                         sp->g1 = rand()%256;
>                         sp->b1 = rand()%256;
> 
> Now for the most important thing. You have to tell the system to draw
> the line. Try this:
> 
>                 GsSortGLine(sp, &WorldOrderingTable[TheBuff], 0);
> 
> >                }
> >
> >
> >
> >                       // wait for end of drawing to the ot
> >               DrawSync(0);
> >
> >                       // wait for V_BLANK interrupt
> >               VSync(0);
> >
> >                       // swap double buffers
> >               GsSwapDispBuff();
> >
> >                       // register clear-command: clear to some weird combo
> >               GsSortClear(16,36,43, &WorldOrderingTable[TheBuff]);
> >
> >                       // register request to draw ordering table
> >               GsDrawOt(&WorldOrderingTable[TheBuff]);
> >
> >               }
> >
> >
> >               // clean up
> >       ResetGraph(3);
> >       return 0;
> >}
> 
> I hope that gets you going,
> 
> Mario
My name is really Austin.My boss is linda. But anyway thanks for the
info.
The errors are all from the pad reading stuff when I compile.What should
I include in the source for the padread stuff.