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: Coding  ?
Date: Sat, 19 Jul 1997 13:16:40 -0700
Organization: SCEA Net Yaroze News
Lines: 146
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What is wrong with this source code?It is supposed to display a bunch of
colored lines.

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/********************************************************
 *                                                      *
 *                                                      *
 *   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)
	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);

	      
	
		// set up the controller pad
	PadInit();

		// 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();

			// 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;

		       sp->r0 = sp->g0 = sp->b0 = rand()%16; 
			
		       sp->r1 = sp->g1 = sp->b1 = rand()%16;
		 }


 
			// 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;
}  

      
	       

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