**************************************************************
*
* Software:
* Initiated:		9/3/93
*
* COPYRIGHT (C) 1992 WILLIAMS ELECTRONICS GAMES, INC.
*
**************************************************************



	.globl	OFREE,OBJLST,BAKLST,DISPLAYON,SCRNRELV
	.globl	GETOBJ,INSOBJ,DELOBJ,DELOBJA8
	.globl	DISPLAY,OBJSTR
	.globl	ANI,SCRTST,SCRTSTG,GANIOF,DELBOBJ
	.globl	INSBOBJ,KILBOBJ
	.globl	PULLBOBJ,PULLOBJ,GANISAG
	.globl	QDMA,QDMAN,GETANIXY
	.globl	obj_addworldxy
	.globl	SCROLLX,SCROLLY,WORLDTLX,WORLDTLY,WORLDTL
	.globl	SCRNTL,SCRNLR,GSCRNREL,ADJNEWTL
	.globl	OBJSTR,SCREENTL,SCREENLR,DMAQCUR
	.globl	dpage,dtype
	.globl	dmaq0cnt,dmaq1cnt,dmaq0flg,dmaq1flg
	.globl	dmaq0,dmaq1
	.globl	STOPOBJS
	.globl	FREEOBJ,EXISTOBJ
	.globl	ISOBJ
	.globl	BEGINOBJW,BEGINOBJ
	.globl	BEGINOBJWP,BEGINOBJP

	.globl	obj_delc,obj_del1c,obj_aniq,obj_aniq_cnoff
	.globl	obj_aniq_scld
	.globl	DELOBJDIE,FRQDELDIE
	.globl	scrn_scaleininit,scrn_scalein,scrn_scaleout
	.globl	display_blank,display_unblank
	.globl	display_2dsclmodeon,display_2dsclstarmodeon

*CONSTANTS

SCRNXP		equ	56		;Left X padding in bitmap
SCRNST		equ	[0,-32]		;Top left of screen
SCRNEND 	equ	[254,432]	;Bottom right of screen
SCRNMID		equ	[128,200]	;Midpoint of screen
PAGE1YO		equ	256		;2nd page Y offset
TSEC		equ	53		;Ticks per second

;HEBLNKINIT 	equ	32h		;Initial value for register
HEBLNKINIT 	equ	65h		;Initial value for register


OWSPD		equ	18		;Open window speed
OWSPD2		equ	25
CWSPD		equ	40		;Close win speed

RING_X_MID	equ	1024

SCALETSIZE	equ	40*4*16


*STRUCT OBJ
OLINK		equ	000	;UHL *next object block
OXVEL		equ	020h	;UHL X velocity 16:16
OYVEL		equ	040h	;UHL Y velocity 16:16
OZVEL		equ	060h	;UHL Z velocity 16:16
OXVAL		equ	080h	;UHL X position 16:16
OXFRAC		equ	080h	; X pos fraction
OXPOS		equ	090h	; X pos integer
OYVAL		equ	0a0h	;UHL Y position 16:16
OYFRAC		equ	0a0h	; Y pos frac
OYPOS		equ	0b0h	; Y pos int
OZVAL		equ	0c0h	;UHL Z position 16:16
OZPOS		equ	0d0h	; Z pos int
OFLAGS		equ	0e0h	;UHW Mode flags
OCTRL		equ	0f0h	;UHW DMA control
OFSET		equ	100h	;UHW Offset
OSAG		equ	110h	;UHL *Image data
OSIZE		equ	130h	;
OSIZEX		equ	130h	;UHW X size
OSIZEY		equ	140h	;UHW Y size
OPAL		equ	150h	;UHW Palette #
OCONST		equ	160h	;UHW Constant color
OIMG		equ	170h	;UHL *Image header
OID		equ	190h	;UHW Object ID
OPLINK		equ	1a0h	;UHL *Process
ODATA_p		equ	1c0h	;UHL *Scale table if scaled obj
OXANI		equ	1e0h	;SHL X scaled animation pt 16:16
OMISC		equ	210h	;UHW Misc data (3D mode Z offset)
ODOFF		equ	220h	;
ODXOFF		equ	220h	;SDW display x offset
ODYOFF		equ	230h	;SDW display y offset
OSCALE		EQU	240H	;UHL scale this object (set to 100% in BEGINOBJ)
OBSIZ		equ	260h
*ENDSTRUCT

NOBJ	equ	350	;Total # objects

BQCELL	equ	0c0h 	;Size of DMA queue element

;Values for OFLAGS & OCTRL
M_WRZERO 	equ	1	;Write zero data
M_WRNONZ 	equ	2	;Write non-zero data
M_CONZER 	equ	4	;Replace zero data with constant
M_CONNON 	equ	8	;Replace non-zero data with constant
M_CONST		equ	0ch	;Replace all with constant
M_FLIPH		equ	10h	;Flip horizontally
M_FLIPV		equ	20h	;Flip vertically
M_3DQ		equ	40h	;Display in quick perspective
M_NODISP		equ	80H	;DONT DISPLAY THIS OBJ
M_3D		equ	100h	;Display in perspective using XYZ
M_SHAD		equ	200h	;Shadow
M_PIXSCAN 	equ	400h	;Pixel scan on
M_NOCOLL 	equ	800h	;Collisions off
M_NOSCALE	equ	1000h	;3D scaling off
M_SCRNREL	equ	2000h	;Screen relative XY on
M_BOBJ		equ	4000h	;background object (special flip)

;OFLAGS/OCTRL bits
B_WRZERO	equ	0
B_WRNONZ	equ	1
B_CONZER	equ	2
B_CONNON	equ	3
B_FLIPH		equ	4
B_FLIPV		equ	5
B_3DQ		equ	6
B_NODISP		equ	7	;DONT DISPLAY THIS OBJ
B_3D		equ	8
B_SHAD		equ	9
B_PIXSCAN	equ	10
B_NOCOLL	equ	11
B_NOSCALE	equ	12
B_SCRNREL	equ	13
B_BOBJ		equ	14

******************************************************************************