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Macros.asm
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Macros.asm
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; ---------------------------------------------------------------------------
; Set a VRAM address via the VDP control port.
; input: 16-bit VRAM address, control port (default is (vdp_control_port).l)
; ---------------------------------------------------------------------------
locVRAM: macro loc,controlport
if ("controlport"=="")
move.l #($40000000+(((loc)&$3FFF)<<16)+(((loc)&$C000)>>14)),(vdp_control_port).l
else
move.l #($40000000+(((loc)&$3FFF)<<16)+(((loc)&$C000)>>14)),controlport
endif
endm
; ---------------------------------------------------------------------------
; DMA copy data from 68K (ROM/RAM) to the VRAM
; input: source, length, destination
; ---------------------------------------------------------------------------
writeVRAM: macro source,length,destination
lea (vdp_control_port).l,a5
move.l #$94000000+(((length>>1)&$FF00)<<8)+$9300+((length>>1)&$FF),(a5)
move.l #$96000000+(((source>>1)&$FF00)<<8)+$9500+((source>>1)&$FF),(a5)
move.w #$9700+((((source>>1)&$FF0000)>>16)&$7F),(a5)
move.w #$4000+((destination)&$3FFF),(a5)
move.w #$80+(((destination)&$C000)>>14),(v_vdp_buffer2).w
move.w (v_vdp_buffer2).w,(a5)
endm
; ---------------------------------------------------------------------------
; DMA copy data from 68K (ROM/RAM) to the CRAM
; input: source, length, destination
; ---------------------------------------------------------------------------
writeCRAM: macro source,length,destination
lea (vdp_control_port).l,a5
move.l #$94000000+(((length>>1)&$FF00)<<8)+$9300+((length>>1)&$FF),(a5)
move.l #$96000000+(((source>>1)&$FF00)<<8)+$9500+((source>>1)&$FF),(a5)
move.w #$9700+((((source>>1)&$FF0000)>>16)&$7F),(a5)
move.w #$C000+(destination&$3FFF),(a5)
move.w #$80+((destination&$C000)>>14),(v_vdp_buffer2).w
move.w (v_vdp_buffer2).w,(a5)
endm
; ---------------------------------------------------------------------------
; DMA fill VRAM with a value
; input: value, length, destination
; ---------------------------------------------------------------------------
fillVRAM: macro value,length,loc
lea (vdp_control_port).l,a5
move.w #$8F01,(a5)
move.l #$94000000+((length&$FF00)<<8)+$9300+(length&$FF),(a5)
move.w #$9780,(a5)
move.l #$40000080+((loc&$3FFF)<<16)+((loc&$C000)>>14),(a5)
move.w #value,(vdp_data_port).l
endm
; ---------------------------------------------------------------------------
; Fill portion of RAM with 0
; input: start, end
; ---------------------------------------------------------------------------
clearRAM: macro start,end
lea (start).w,a1
moveq #0,d0
move.w #((end)-(start))/4-1,d1
.loop:
move.l d0,(a1)+
dbf d1,.loop
if (end-start)&2
move.w d0,(a1)+
endif
if (end-start)&1
move.b d0,(a1)+
endif
endm
; ---------------------------------------------------------------------------
; Copy a tilemap from 68K (ROM/RAM) to the VRAM without using DMA
; input: source, destination, width [cells], height [cells]
; ---------------------------------------------------------------------------
copyTilemap: macro source,destination,width,height
lea (source).l,a1
locVRAM destination,d0
moveq #width,d1
moveq #height,d2
bsr.w TilemapToVRAM
endm
; ---------------------------------------------------------------------------
; stop the Z80
; ---------------------------------------------------------------------------
stopZ80: macro
move.w #$100,(z80_bus_request).l
endm
; ---------------------------------------------------------------------------
; wait for Z80 to stop
; ---------------------------------------------------------------------------
waitZ80: macro
.wait: btst #0,(z80_bus_request).l
bne.s .wait
endm
; ---------------------------------------------------------------------------
; reset the Z80
; ---------------------------------------------------------------------------
resetZ80: macro
move.w #$100,(z80_reset).l
endm
resetZ80a: macro
move.w #0,(z80_reset).l
endm
; ---------------------------------------------------------------------------
; start the Z80
; ---------------------------------------------------------------------------
startZ80: macro
move.w #0,(z80_bus_request).l
endm
; ---------------------------------------------------------------------------
; disable interrupts
; ---------------------------------------------------------------------------
disable_ints: macro
move #$2700,sr
endm
; ---------------------------------------------------------------------------
; enable interrupts
; ---------------------------------------------------------------------------
enable_ints: macro
move #$2300,sr
endm
; ---------------------------------------------------------------------------
; long conditional jumps
; ---------------------------------------------------------------------------
jhi: macro loc
bls.s .nojump
jmp loc
.nojump:
endm
jcc: macro loc
bcs.s .nojump
jmp loc
.nojump:
endm
jhs: macro loc
jcc loc
endm
jls: macro loc
bhi.s .nojump
jmp loc
.nojump:
endm
jcs: macro loc
bcc.s .nojump
jmp loc
.nojump:
endm
jlo: macro loc
jcs loc
endm
jeq: macro loc
bne.s .nojump
jmp loc
.nojump:
endm
jne: macro loc
beq.s .nojump
jmp loc
.nojump:
endm
jgt: macro loc
ble.s .nojump
jmp loc
.nojump:
endm
jge: macro loc
blt.s .nojump
jmp loc
.nojump:
endm
jle: macro loc
bgt.s .nojump
jmp loc
.nojump:
endm
jlt: macro loc
bge.s .nojump
jmp loc
.nojump:
endm
jpl: macro loc
bmi.s .nojump
jmp loc
.nojump:
endm
jmi: macro loc
bpl.s .nojump
jmp loc
.nojump:
endm
; ---------------------------------------------------------------------------
; check if object moves out of range
; input: location to jump to if out of range, x-axis pos (obX(a0) by default)
; ---------------------------------------------------------------------------
out_of_range: macro exit,pos
if ("pos"<>"")
move.w pos,d0 ; get object position (if specified as not obX)
else
move.w obX(a0),d0 ; get object position
endif
andi.w #$FF80,d0 ; round down to nearest $80
move.w (v_screenposx).w,d1 ; get screen position
subi.w #128,d1
andi.w #$FF80,d1
sub.w d1,d0 ; approx distance between object and screen
cmpi.w #128+320+192,d0
bhi.ATTRIBUTE exit
endm
; ---------------------------------------------------------------------------
; bankswitch between SRAM and ROM
; (remember to enable SRAM in the header first!)
; ---------------------------------------------------------------------------
gotoSRAM: macro
move.b #1,(sram_port).l
endm
gotoROM: macro
move.b #0,(sram_port).l
endm
; ---------------------------------------------------------------------------
; compare the size of an index with ZoneCount constant
; (should be used immediately after the index)
; input: index address, element size
; ---------------------------------------------------------------------------
zonewarning: macro loc,elementsize
._end:
if (._end-loc)-(ZoneCount*elementsize)<>0
warning "Size of loc (\{(._end-loc)/elementsize}) does not match ZoneCount (\{ZoneCount})."
endif
endm
; ---------------------------------------------------------------------------
; produce a packed art-tile
; ---------------------------------------------------------------------------
make_art_tile function addr,pal,pri,((pri&1)<<15)|((pal&3)<<13)|addr
; ---------------------------------------------------------------------------
; sprite mappings and DPLCs macros
; ---------------------------------------------------------------------------
SonicMappingsVer = 1
SonicDplcVer = 1
include "_maps/MapMacros.asm"
; ---------------------------------------------------------------------------
; turn a sample rate into a djnz loop counter
; ---------------------------------------------------------------------------
pcmLoopCounter function sampleRate,baseCycles, 1+(53693175/15/(sampleRate)-(baseCycles)+(13/2))/13
dpcmLoopCounter function sampleRate, pcmLoopCounter(sampleRate,301/2) ; 301 is the number of cycles zPlayPCMLoop takes.