/
ips.inc
75 lines (65 loc) · 2.22 KB
/
ips.inc
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IPSPRGOFFSET = 16-$8000
; Generates an IPS hunk header for named segment, which specifes the location
; and length where an IPS tool will place the segment in the modded file.
;
; The code:
; ips_hunkhdr "HUNK1"
; Is equivalent to:
; .import __HUNK1_LOAD__, __HUNK1_SIZE__
; .byte 0
; .dbyt __HUNK1_LOAD__+IPSPRGOFFSET
; .dbyt __HUNK1_SIZE__
.macro ips_hunkhdr name
.import .ident(.concat("__", name, "_LOAD__"))
.import .ident(.concat("__", name, "_SIZE__"))
.byte 0
; Dunno why -(-x) is necessary. But otherwise get a range error
.dbyt .ident(.concat("__", name, "_LOAD__"))-(-IPSPRGOFFSET)
.dbyt .ident(.concat("__", name, "_SIZE__"))
.endmacro
.ifndef IPSCHROFFSET
IPSCHROFFSET = 16+$8000
.endif
CHR00 = $0000
CHR01 = $2000
CHR_LEFT = $0000
CHR_RIGHT = $1000
TILE_SIZE = $10
; Generates an IPS hunk header for tiles, which specifes the location and
; length where an IPS tool will place the tiles in the modded file.
;
; For example, to replace a tile in the "left" (first) section of CHR01 in at
; row 0 and column 3:
; ips_tilehdr CHR01+CHR_LEFT,$03
.macro ips_tilehdr mapper_addr,tile
.byte 0
.dbyt (mapper_addr)+((tile)*TILE_SIZE)+IPSCHROFFSET
.dbyt TILE_SIZE
.endmacro
; Declares the IPS segment hunk with name starts at addr, and optional size.
; The segment should be defined elsewhere. Only useful when combined with
; auto-generation of linker config.
.macro ips_segment name,addr,size
.if .paramcount = 3
.fileopt comment, .sprintf("ips: %d %s %d", addr, name, size)
.else
.fileopt comment, .sprintf("ips: %d %s", addr, name)
.endif
.pushseg
.segment .concat(name, "_HDR")
ips_hunkhdr name
.popseg
.endmacro
; Declares the IPS segment hunk with name starts at mapper_addr+start_tile. The
; segment should be defined elsewhere. Only useful when combined with
; auto-generation of linker config.
.macro ips_tile_segment name,mapper_addr,start_tile
.fileopt comment, .sprintf("ips: %d00000 %s %d", (mapper_addr)+((start_tile)*TILE_SIZE), name, 4096-((start_tile)*TILE_SIZE))
.pushseg
.segment .concat(name, "_HDR")
.import .ident(.concat("__", name, "_SIZE__"))
.byte 0
.dbyt (mapper_addr)+((start_tile)*TILE_SIZE)+IPSCHROFFSET
.dbyt .ident(.concat("__", name, "_SIZE__"))
.popseg
.endmacro