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170 lines
7.8 KiB
Lua
170 lines
7.8 KiB
Lua
; Prog8 definitions for floating point handling on the Commodore 128
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%option enable_floats
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%import floats_functions
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floats {
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; ---- this block contains C-128 compatible floating point related functions ----
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const float PI = 3.141592653589793
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const float TWOPI = 6.283185307179586
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; ---- ROM float functions ----
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; note: the fac1 and fac2 are working registers and take 6 bytes each,
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; floats in memory (and rom) are stored in 5-byte MFLPT packed format.
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; note: fac1/2 might get clobbered even if not mentioned in the function's name.
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; note: for subtraction and division, the left operand is in fac2, the right operand in fac1.
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romsub $af00 = AYINT() clobbers(A,X,Y) ; fac1-> signed word in 102-103 ($66-$67) MSB FIRST. (might throw ILLEGAL QUANTITY)
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; GIVAYF: signed word in Y/A (note different lsb/msb order) -> float in fac1
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; there is also floats.GIVUAYFAY - unsigned word in A/Y (lo/hi) to fac1
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; (tip: use GIVAYFAY to use A/Y input; lo/hi switched to normal order)
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romsub $af03 = GIVAYF(ubyte lo @ Y, ubyte hi @ A) clobbers(A,X,Y)
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romsub $af06 = FOUT() clobbers(X) -> uword @ AY ; fac1 -> string, address returned in AY
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; romsub $af09 = VAL_1() clobbers(A,X,Y) ; convert ASCII string to floating point [not yet implemented!!!]
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; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY) (result also in $14/15)
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; (tip: use GETADRAY to get A/Y output; lo/hi switched to normal little endian order)
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romsub $af0c = GETADR() clobbers(X) -> ubyte @ Y, ubyte @ A
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romsub $af0f = FLOATC() clobbers(A,X,Y) ; convert address to floating point
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romsub $af12 = FSUB(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt from A/Y - fac1
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romsub $af15 = FSUBT() clobbers(A,X,Y) ; fac1 = fac2-fac1 mind the order of the operands NOTE: use FSUBT2() instead!
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romsub $af18 = FADD(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 += mflpt value from A/Y
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romsub $af1b = FADDT() clobbers(A,X,Y) ; fac1 += fac2 NOTE: use FADDT2() instead!
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romsub $af1e = FMULT(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 *= mflpt value from A/Y
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romsub $af21 = FMULTT() clobbers(A,X,Y) ; fac1 *= fac2 NOTE: use FMULTT2() instead!
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romsub $af24 = FDIV(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt in A/Y / fac1 (remainder in fac2)
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romsub $af27 = FDIVT() clobbers(A,X,Y) ; fac1 = fac2/fac1 (remainder in fac2) mind the order of the operands NOTE: use FDIVT2() instead!
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romsub $af2a = LOG() clobbers(A,X,Y) ; fac1 = LN(fac1) (natural log)
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romsub $af2d = INT() clobbers(A,X,Y) ; INT() truncates, use FADDH first to round instead of trunc
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romsub $af30 = SQR() clobbers(A,X,Y) ; fac1 = SQRT(fac1)
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romsub $af33 = NEGOP() clobbers(A) ; switch the sign of fac1 (fac1 = -fac1)
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romsub $af36 = FPWR(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = fac2 ** float in A/Y
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romsub $af39 = FPWRT() clobbers(A,X,Y) ; fac1 = fac2 ** fac1 NOTE: use FPWRT2() instead!
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romsub $af3c = EXP() clobbers(A,X,Y) ; fac1 = EXP(fac1) (e ** fac1)
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romsub $af3f = COS() clobbers(A,X,Y) ; fac1 = COS(fac1)
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romsub $af42 = SIN() clobbers(A,X,Y) ; fac1 = SIN(fac1)
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romsub $af45 = TAN() clobbers(A,X,Y) ; fac1 = TAN(fac1)
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romsub $af48 = ATN() clobbers(A,X,Y) ; fac1 = ATN(fac1)
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romsub $af4b = ROUND() clobbers(A,X,Y) ; round fac1
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romsub $af4e = ABS() clobbers(A,X,Y) ; fac1 = ABS(fac1)
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romsub $af51 = SIGN() clobbers(X,Y) -> ubyte @ A ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
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romsub $af54 = FCOMP(uword mflpt @ AY) clobbers(X,Y) -> ubyte @ A ; A = compare fac1 to mflpt in A/Y, 0=equal 1=fac1 is greater, 255=fac1 is less than
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romsub $af57 = RND_0() clobbers(A,X,Y) ; fac1 = RND(fac1) float random number generator
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romsub $af57 = RND() clobbers(A,X,Y) ; alias for RND_0
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romsub $af5a = CONUPK(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac2
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romsub $af5d = ROMUPK(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in current bank in A/Y into fac2
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romsub $af60 = MOVFRM(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac1 (use MOVFM instead)
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romsub $af63 = MOVFM(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac1
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romsub $af66 = MOVMF(uword mflpt @ XY) clobbers(A,X,Y) ; store fac1 to memory X/Y as 5-byte mflpt
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romsub $af69 = MOVFA() clobbers(A,X) ; copy fac2 to fac1
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romsub $af6c = MOVAF() clobbers(A,X) ; copy fac1 to fac2 (rounded)
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; X16 additions
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romsub $af6f = FADDH() clobbers(A,X,Y) ; fac1 += 0.5, for rounding- call this before INT
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romsub $af72 = FADDT2() clobbers(A,X,Y) ; fac1 += fac2
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romsub $af75 = ZEROFC() clobbers(A,X,Y) ; fac1 = 0
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romsub $af78 = NORMAL() clobbers(A,X,Y) ; normalize fac1 (?)
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romsub $af7b = NEGFAC() clobbers(A) ; switch the sign of fac1 (fac1 = -fac1) (juse use NEGOP() instead!)
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romsub $af7e = FMULTT2() clobbers(A,X,Y) ; fac1 *= fac2
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romsub $af81 = MUL10() clobbers(A,X,Y) ; fac1 *= 10
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romsub $af84 = DIV10() clobbers(A,X,Y) ; fac1 /= 10 , CAUTION: result is always positive!
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romsub $af87 = FDIVT2() clobbers(A,X,Y) ; fac1 = fac2/fac1 (remainder in fac2) mind the order of the operands
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romsub $af8a = MOVEF() clobbers(A,X) ; copy fac1 to fac2
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romsub $af8d = SGN() clobbers(A,X,Y) ; fac1 = SGN(fac1), result of SIGN (-1, 0 or 1)
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romsub $af90 = FLOAT() clobbers(A,X,Y) ; FAC = (u8).A
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romsub $af93 = FLOATS() clobbers(A,X,Y) ; FAC = (s16)facho+1:facho
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romsub $af9C = QINT() clobbers(A,X,Y) ; facho:facho+1:facho+2:facho+3 = u32(FAC)
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romsub $af9f = FINLOG(byte value @A) clobbers (A, X, Y) ; fac1 += signed byte in A
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romsub $afa5 = FPWRT2() clobbers(A,X,Y) ; fac1 = fac2 ** fac1
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asmsub FREADSA (byte value @A) clobbers(A,X,Y) {
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; ---- 8 bit signed A -> float in fac1
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%asm {{
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tay
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bpl +
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lda #$ff
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jmp GIVAYF
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+ lda #0
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jmp GIVAYF
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}}
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}
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asmsub GIVUAYFAY (uword value @ AY) clobbers(A,X,Y) {
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; ---- unsigned 16 bit word in A/Y (lo/hi) to fac1
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%asm {{
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phx
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sty $64 ; facmo
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sta $65 ; facmo+1
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ldx #$90
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sec
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jsr FLOATC
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plx
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rts
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}}
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}
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asmsub GIVAYFAY (uword value @ AY) clobbers(A,X,Y) {
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; ---- signed 16 bit word in A/Y (lo/hi) to float in fac1
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%asm {{
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sta P8ZP_SCRATCH_B1
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tya
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ldy P8ZP_SCRATCH_B1
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jmp GIVAYF ; this uses the inverse order, Y/A
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}}
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}
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asmsub FTOSWRDAY () clobbers(X) -> uword @ AY {
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; ---- fac1 to signed word in A/Y
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%asm {{
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jsr FTOSWORDYA ; note the inverse Y/A order
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sta P8ZP_SCRATCH_B1
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tya
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ldy P8ZP_SCRATCH_B1
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rts
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}}
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}
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asmsub GETADRAY () clobbers(X) -> uword @ AY {
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; ---- fac1 to unsigned word in A/Y
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%asm {{
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jsr GETADR ; this uses the inverse order, Y/A
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sta P8ZP_SCRATCH_B1
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tya
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ldy P8ZP_SCRATCH_B1
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rts
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}}
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}
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asmsub FREADUY (ubyte value @Y) {
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; -- 8 bit unsigned Y -> float in fac1
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%asm {{
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tya
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jmp FLOAT
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}}
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}
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&uword AYINT_facmo = $66 ; $66/$67 contain result of AYINT
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sub rndf() -> float {
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%asm {{
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stx P8ZP_SCRATCH_REG
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lda #1
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jsr RND_0
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ldx P8ZP_SCRATCH_REG
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rts
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}}
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}
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%asminclude "library:c128/floats.asm"
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%asminclude "library:c64/floats_funcs.asm"
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}
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