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119 lines
1.3 KiB
NASM
119 lines
1.3 KiB
NASM
; Constant data (db, dw, dl) macros
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dwb: MACRO
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dw \1
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db \2
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ENDM
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dbw: MACRO
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db \1
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dw \2
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ENDM
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dbbw: MACRO
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db \1, \2
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dw \3
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ENDM
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dbww: MACRO
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db \1
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dw \2, \3
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ENDM
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dbwww: MACRO
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db \1
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dw \2, \3, \4
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ENDM
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dn: MACRO ; nybbles
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rept _NARG / 2
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db ((\1) << 4) | (\2)
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shift
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shift
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endr
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ENDM
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dc: MACRO ; "crumbs"
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rept _NARG / 4
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db ((\1) << 6) | ((\2) << 4) | ((\3) << 2) | (\4)
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shift
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shift
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shift
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shift
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endr
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ENDM
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dx: MACRO
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x = 8 * ((\1) - 1)
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rept \1
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db ((\2) >> x) & $ff
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x = x + -8
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endr
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ENDM
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dt: MACRO ; three-byte (big-endian)
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dx 3, \1
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ENDM
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dd: MACRO ; four-byte (big-endian)
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dx 4, \1
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ENDM
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bigdw: MACRO ; big-endian word
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dx 2, \1
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ENDM
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dba: MACRO ; dbw bank, address
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rept _NARG
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dbw BANK(\1), \1
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shift
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endr
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ENDM
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dab: MACRO ; dwb address, bank
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rept _NARG
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dwb \1, BANK(\1)
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shift
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endr
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ENDM
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dba_pic: MACRO ; dbw bank, address
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db BANK(\1) - PICS_FIX
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dw \1
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ENDM
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dbpixel: MACRO
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if _NARG >= 4
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; x tile, x pxl, y tile, y pxl
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db \1 * 8 + \3, \2 * 8 + \4
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else
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; x, y
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db \1 * 8, \2 * 8
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endc
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ENDM
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dsprite: MACRO
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; y tile, y pxl, x tile, x pxl, vtile offset, flags, attributes
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db (\1 * 8) % $100 + \2, (\3 * 8) % $100 + \4, \5, \6
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ENDM
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sine_wave: MACRO
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; \1: amplitude
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x = 0
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rept $20
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; Round up.
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dw (sin(x) + (sin(x) & $ff)) >> 8
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x = x + (\1) * $40000
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endr
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ENDM
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bcd: MACRO
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rept _NARG
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dn ((\1) % 100) / 10, (\1) % 10
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shift
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endr
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ENDM
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