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macros.asm
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macros.asm
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; Some macros for data structures.
; ---------------------------------------------------------------------------
levnamhdr macro name, unknown, act
dc.l name
dc.l unknown
dc.w act
endm
; ---------------------------------------------------------------------------
; the header file contains the following entries (12 bytes):
; dc.b xsize, ysize, fgstyle, bgstyle
; dc.w playerx, playery, flagx, flagy
maphdr macro fnamehdr, fgtile, block, bgtile, enemy
binclude fnamehdr
dc.l fgtile, block, bgtile, enemy
endm
; ---------------------------------------------------------------------------
anim_frame macro mode, duration, spriteframe
dc.b mode
dc.b duration
dc.w spriteframe
endm
; ---------------------------------------------------------------------------
enemyloaddata macro paladdr, artaddr, codeaddr
dc.w paladdr
dc.w artaddr
dc.l codeaddr
endm
; ---------------------------------------------------------------------------
; if the art crosses a $20000 boundary, align it to make DMA safe
align_dmasafe macro artsize
if ((*) ! ((*)+artsize))&$FE0000 <> 0
align $8000
endif
endm
; ---------------------------------------------------------------------------
sprite_frame_unc macro xcenter, ycenter, width, height, art, {INTLABEL}
align_dmasafe ((((width+7)>>3)*((height+7)>>3))*$20 + 6)
__LABEL__ label *
dc.b xcenter, ycenter
dc.w width, height
binclude art
endm
; ---------------------------------------------------------------------------
sprite_frame_vram macro spriteindex, xcenter, ycenter, width, height
dc.w spriteindex
dc.b xcenter, ycenter
dc.w width, height
endm
; ---------------------------------------------------------------------------
sprite_attr macro xpos, ypos, xsize, ysize, pattern, lnk
dc.w ypos
dc.w (xsize<<10) | (ysize<<8) | lnk
dc.w pattern
dc.w xpos
endm
; ---------------------------------------------------------------------------
ptfm_move macro duration, xvel, yvel
dc.w duration
dc.l xvel, yvel
endm
; ---------------------------------------------------------------------------
ptfm macro xpos, ypos, bufL, bufR, bufT, bufB, t, s, h, v, pp
dc.w xpos, ypos
dc.b bufL, bufR, bufT, bufB
dc.b (t<<4)|s, (h<<4)|v
dc.w pp
endm
; simplifying macros and functions, taken from Sonic 2 disassembly
; ---------------------------------------------------------------------------
; VDP addresses
VDP_data_port = $C00000 ; (8=r/w, 16=r/w)
VDP_control_port = $C00004 ; (8=r/w, 16=r/w)
PSG_input = $C00011
; 68k address for the DMA macro
DMA_data_thunk = $FFFFF800
; makes a VDP address difference
vdpCommDelta function addr,((addr&$3FFF)<<16)|((addr&$C000)>>14)
; makes a VDP command
vdpComm function addr,type,rwd,(((type&rwd)&3)<<30)|((addr&$3FFF)<<16)|(((type&rwd)&$FC)<<2)|((addr&$C000)>>14)
; values for the type argument
VRAM = %100001
CRAM = %101011
VSRAM = %100101
; values for the rwd argument
READ = %001100
WRITE = %000111
DMA = %100111
; tells the VDP to copy a region of 68k memory to VRAM or CRAM or VSRAM
; a6 is the address of VDP_data_port
dma68kToVDP macro source,dest,length,type
move.l #($9400|((((length)>>1)&$FF00)>>8))|(($9300|(((length)>>1)&$FF))<<16),4(a6)
move.l #($9600|((((source)>>1)&$FF00)>>8))|(($9500|(((source)>>1)&$FF))<<16),4(a6)
move.w #$9700|(((((source)>>1)&$FF0000)>>16)&$7F),4(a6)
move.l #vdpComm(dest,type,DMA),(DMA_data_thunk).w
move.w (DMA_data_thunk).w,4(a6)
move.w (DMA_data_thunk+2).w,4(a6)
endm
; calculates initial loop counter value for a dbf loop
; that writes n bytes total at 4 bytes per iteration
bytesToLcnt function n,n>>2-1
; ---------------------------------------------------------------------------
; Z80 addresses
Z80_RAM = $A00000 ; start of Z80 RAM
Z80_RAM_End = $A02000 ; end of non-reserved Z80 RAM
Z80_Bus_Request = $A11100
Z80_Reset = $A11200
Security_Addr = $A14000
; ---------------------------------------------------------------------------
; I/O Area
HW_Version = $A10001
HW_Port_1_Data = $A10003
HW_Port_2_Data = $A10005
HW_Expansion_Data = $A10007
HW_Port_1_Control = $A10009
HW_Port_2_Control = $A1000B
HW_Expansion_Control = $A1000D
HW_Port_1_TxData = $A1000F
HW_Port_1_RxData = $A10011
HW_Port_1_SCtrl = $A10013
HW_Port_2_TxData = $A10015
HW_Port_2_RxData = $A10017
HW_Port_2_SCtrl = $A10019
HW_Expansion_TxData = $A1001B
HW_Expansion_RxData = $A1001D
HW_Expansion_SCtrl = $A1001F
if zeroOffsetOptimization=0
; disable a space optimization in AS so we can build a bit-perfect rom
; (the hard way, but it requires no modification of AS itself)
chkop function op,ref,(substr(lowstring(op),0,strlen(ref))<>ref)
; 1-arg instruction that's self-patching to remove 0-offset optimization
insn1op macro oper,x
if (chkop("x","0(") && chkop("x","id(") && chkop("x","slot_rout("))
!oper x
else
!oper 1+x
!org *-1
!dc.b 0
endif
endm
; 2-arg instruction that's self-patching to remove 0-offset optimization
insn2op macro oper,x,y
if (chkop("x","0(") && chkop("x","id(") && chkop("x","slot_rout("))
if (chkop("y","0(") && chkop("y","id(") && chkop("y","slot_rout("))
!oper x,y
else
!oper x,1+y
!org *-1
!dc.b 0
endif
else
if chkop("y","d")
if (chkop("y","0(") && chkop("y","id(") && chkop("y","slot_rout("))
start:
!oper 1+x,y
end:
!org start+3
!dc.b 0
!org end
else
!oper 1+x,1+y
!org *-3
!dc.b 0
!org *+1
!dc.b 0
endif
else
!oper 1+x,y
!org *-1
!dc.b 0
endif
endif
endm
; instructions that were used with 0(a#) syntax
; defined to assemble as they originally did
_move macro
insn2op move.ATTRIBUTE, ALLARGS
endm
_add macro
insn2op add.ATTRIBUTE, ALLARGS
endm
_addq macro
insn2op addq.ATTRIBUTE, ALLARGS
endm
_cmp macro
insn2op cmp.ATTRIBUTE, ALLARGS
endm
_cmpi macro
insn2op cmpi.ATTRIBUTE, ALLARGS
endm
_clr macro
insn1op clr.ATTRIBUTE, ALLARGS
endm
_tst macro
insn1op tst.ATTRIBUTE, ALLARGS
endm
else
; regular meaning to the assembler; better but unlike original
_move macro
!move.ATTRIBUTE ALLARGS
endm
_add macro
!add.ATTRIBUTE ALLARGS
endm
_addq macro
!addq.ATTRIBUTE ALLARGS
endm
_cmp macro
!cmp.ATTRIBUTE ALLARGS
endm
_cmpi macro
!cmpi.ATTRIBUTE ALLARGS
endm
_clr macro
!clr.ATTRIBUTE ALLARGS
endm
_tst macro
!tst.ATTRIBUTE ALLARGS
endm
endif