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s2.macros.asm
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; >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
; simplifying macros and functions
; 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
dma68kToVDP macro source,dest,length,type
lea (VDP_control_port).l,a5
move.l #(($9400|((((length)>>1)&$FF00)>>8))<<16)|($9300|(((length)>>1)&$FF)),(a5)
move.l #(($9600|((((source)>>1)&$FF00)>>8))<<16)|($9500|(((source)>>1)&$FF)),(a5)
move.w #$9700|(((((source)>>1)&$FF0000)>>16)&$7F),(a5)
move.w #((vdpComm(dest,type,DMA)>>16)&$FFFF),(a5)
move.w #(vdpComm(dest,type,DMA)&$FFFF),(DMA_data_thunk).w
move.w (DMA_data_thunk).w,(a5)
endm
; tells the VDP to fill a region of VRAM with a certain byte
dmaFillVRAM macro byte,addr,length
lea (VDP_control_port).l,a5
move.w #$8F01,(a5) ; VRAM pointer increment: $0001
move.l #(($9400|((((length)-1)&$FF00)>>8))<<16)|($9300|(((length)-1)&$FF)),(a5) ; DMA length ...
move.w #$9780,(a5) ; VRAM fill
move.l #$40000080|(((addr)&$3FFF)<<16)|(((addr)&$C000)>>14),(a5) ; Start at ...
move.w #(byte)<<8,(VDP_data_port).l ; Fill with byte
loop: move.w (a5),d1
btst #1,d1
bne.s loop ; busy loop until the VDP is finished filling...
move.w #$8F02,(a5) ; VRAM pointer increment: $0002
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
; calculates initial loop counter value for a dbf loop
; that writes n bytes total at 2 bytes per iteration
bytesToWcnt function n,n>>1-1
; fills a region of 68k RAM with 0 (4 bytes at a time)
clearRAM macro addr,length
if length&3
fatal "clearRAM len must be divisible by 4, but was length"
endif
lea (addr).w,a1
moveq #0,d0
move.w #bytesToLcnt(length),d1
loop: move.l d0,(a1)+
dbf d1,loop
endm
; tells the Z80 to stop, and waits for it to finish stopping (acquire bus)
stopZ80 macro
move.w #$100,(Z80_Bus_Request).l ; stop the Z80
loop: btst #0,(Z80_Bus_Request).l
bne.s loop ; loop until it says it's stopped
endm
; tells the Z80 to start again
startZ80 macro
move.w #0,(Z80_Bus_Request).l ; start the Z80
endm
; function to make a little-endian 16-bit pointer for the Z80 sound driver
z80_ptr function x,(x)<<8&$FF00|(x)>>8&$7F|$80
; macro to declare a little-endian 16-bit pointer for the Z80 sound driver
rom_ptr_z80 macro addr
dc.w z80_ptr(addr)
endm
; macro to replace the destination with its absolute value
abs macro destination
tst.ATTRIBUTE destination
bpl.s skip
neg.ATTRIBUTE destination
skip:
endm
if 0|allOptimizations
absw macro destination ; use a short branch instead
abs.ATTRIBUTE destination
endm
else
; macro to replace the destination with its absolute value using a word-sized branch
absw macro destination
tst.ATTRIBUTE destination
bpl.w skip
neg.ATTRIBUTE destination
skip:
endm
endif
; macro to move the absolute value of the source in the destination
mvabs macro source,destination
move.ATTRIBUTE source,destination
bpl.s skip
neg.ATTRIBUTE destination
skip:
endm
; macro to declare an offset table
offsetTable macro {INTLABEL}
current_offset_table := __LABEL__
__LABEL__ label *
endm
; macro to declare an entry in an offset table
offsetTableEntry macro ptr
dc.ATTRIBUTE ptr-current_offset_table
endm
; macro to declare a zone-ordered table
; entryLen is the length of each table entry, and zoneEntries is the number of entries per zone
zoneOrderedTable macro entryLen,zoneEntries,{INTLABEL}
__LABEL__ label *
; set some global variables
zone_table_name := "__LABEL__"
zone_table_addr := *
zone_entry_len := entryLen
zone_entries := zoneEntries
zone_entries_left := 0
cur_zone_id := 0
cur_zone_str := "0"
endm
zoneOrderedOffsetTable macro entryLen,zoneEntries,{INTLABEL}
current_offset_table := __LABEL__
__LABEL__ zoneOrderedTable entryLen,zoneEntries
endm
; macro to declare one or more entries in a zone-ordered table
zoneTableEntry macro value
if "value"<>""
if zone_entries_left
dc.ATTRIBUTE value
zone_entries_left := zone_entries_left-1
else
!org zone_table_addr+zone_id_{cur_zone_str}*zone_entry_len*zone_entries
dc.ATTRIBUTE value
zone_entries_left := zone_entries-1
cur_zone_id := cur_zone_id+1
cur_zone_str := "\{cur_zone_id}"
endif
shift
zoneTableEntry.ATTRIBUTE ALLARGS
endif
endm
; macro to declare one or more BINCLUDE entries in a zone-ordered table
zoneTableBinEntry macro numEntries,path
if zone_entries_left
BINCLUDE path
zone_entries_left := zone_entries_left-numEntries
else
!org zone_table_addr+zone_id_{cur_zone_str}*zone_entry_len*zone_entries
BINCLUDE path
zone_entries_left := zone_entries-numEntries
cur_zone_id := cur_zone_id+1
cur_zone_str := "\{cur_zone_id}"
endif
endm
; macro to declare one entry in a zone-ordered offset table
zoneOffsetTableEntry macro value
zoneTableEntry.ATTRIBUTE value-current_offset_table
endm
; macro which sets the PC to the correct value at the end of a zone offset table and checks if the correct
; number of entries were declared
zoneTableEnd macro
if (cur_zone_id<>no_of_zones)&&(MOMPASS=1)
message "Warning: Table \{zone_table_name} has \{cur_zone_id/1.0} entries, but it should have \{(no_of_zones)/1.0} entries"
endif
!org zone_table_addr+cur_zone_id*zone_entry_len*zone_entries
endm
; macro to declare sub-object data
subObjData macro mappings,vram,renderflags,priority,width,collision
dc.l mappings
dc.w vram
dc.b renderflags,priority,width,collision
endm
; macros to convert from tile index to art tiles, block mapping or VRAM address.
make_art_tile function addr,pal,pri,((pri&1)<<15)|((pal&3)<<13)|(addr&tile_mask)
make_art_tile_2p function addr,pal,pri,((pri&1)<<15)|((pal&3)<<13)|((addr&tile_mask)>>1)
make_block_tile function addr,flx,fly,pal,pri,((pri&1)<<15)|((pal&3)<<13)|((fly&1)<<12)|((flx&1)<<11)|(addr&tile_mask)
make_block_tile_2p function addr,flx,fly,pal,pri,((pri&1)<<15)|((pal&3)<<13)|((fly&1)<<12)|((flx&1)<<11)|((addr&tile_mask)>>1)
tiles_to_bytes function addr,((addr&$7FF)<<5)
make_block_tile_pair function addr,flx,fly,pal,pri,((make_block_tile(addr,flx,fly,pal,pri)<<16)|make_block_tile(addr,flx,fly,pal,pri))
make_block_tile_pair_2p function addr,flx,fly,pal,pri,((make_block_tile_2p(addr,flx,fly,pal,pri)<<16)|make_block_tile_2p(addr,flx,fly,pal,pri))
; function to calculate the location of a tile in H40 plane mappings
planeLocH40 function col,line,(($80 * line) + (2 * col))