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104 lines
1.8 KiB
NASM
104 lines
1.8 KiB
NASM
; Value macros
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; Many arbitrary percentages are simple base-10 or base-16 values:
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; - 10 = 4 percent
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; - 15 = 6 percent
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; - $10 = 6 percent + 1 = 7 percent - 1
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; - 20 = 8 percent
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; - 25 = 10 percent
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; - 30 = 12 percent
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; - 40 = 16 percent
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; - 50 = 20 percent - 1
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; - 60 = 24 percent - 1
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; - 70 = 28 percent - 1
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; - 80 = 31 percent + 1 = 32 percent - 1
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; - 85 = 33 percent + 1 = 34 percent - 1
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; - 100 = 39 percent + 1 = 40 percent - 2
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; - 120 = 47 percent + 1
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; - 123 = 49 percent - 1
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; - 160 = 63 percent
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; - 180 = 71 percent - 1 = 70 percent + 2
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; - 200 = 79 percent - 1
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; - 230 = 90 percent + 1
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percent EQUS "* $ff / 100"
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; e.g. 1 out_of 2 == 50 percent + 1 == $80
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out_of EQUS "* $100 /"
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assert_power_of_2: MACRO
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assert (\1) & ((\1) - 1) == 0, "\1 must be a power of 2"
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ENDM
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; 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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dn: MACRO ; nybbles
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rept _NARG / 2
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db ((\1) << 4) | (\2)
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shift 2
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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 4
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endr
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ENDM
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dt: MACRO ; three-byte (big-endian)
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db LOW((\1) >> 16), HIGH(\1), LOW(\1)
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ENDM
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dd: MACRO ; four-byte (big-endian)
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db HIGH((\1) >> 16), LOW((\1) >> 16), HIGH(\1), LOW(\1)
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ENDM
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bigdw: MACRO ; big-endian word
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db HIGH(\1), LOW(\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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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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sine_table: MACRO
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; \1 samples of sin(x) from x=0 to x<32768 (pi radians)
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x = 0
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rept \1
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dw (sin(x) + (sin(x) & $ff)) >> 8 ; round up
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x = x + DIV(32768, \1) ; a circle has 65536 "degrees"
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endr
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ENDM
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