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196 lines
8.6 KiB
Lua
196 lines
8.6 KiB
Lua
; Prog8 definitions for floating point handling on the CommanderX16
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%option enable_floats, no_symbol_prefixing, ignore_unused
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%import floats_functions
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floats {
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; ---- this block contains C-64 compatible floating point related functions ----
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const float π = 3.141592653589793
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const float PI = π
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const float TWOPI = 2*π
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; ---- ROM float functions (same as on C128 except base page) ----
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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 $fe00 = AYINT() clobbers(A,X,Y) ; fac1-> signed word in 100-101 ($64-$65) 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 $fe03 = GIVAYF(ubyte lo @ Y, ubyte hi @ A) clobbers(A,X,Y)
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romsub $fe06 = FOUT() clobbers(X) -> uword @ AY ; fac1 -> string, address returned in AY
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romsub $fe09 = VAL_1(uword string @XY, ubyte length @A) clobbers(A,X,Y) -> float @FAC1 ; convert ASCII string in XY and length in A, to floating point in FAC1. WARNING: only implemented in ROM 47+. Safer to use floats.parse() instead.
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; GETADR: 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 $fe0c = GETADR() clobbers(X) -> ubyte @ Y, ubyte @ A
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romsub $fe0f = FLOATC() clobbers(A,X,Y) ; convert address to floating point
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romsub $fe12 = FSUB(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt from A/Y - fac1
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romsub $fe15 = FSUBT() clobbers(A,X,Y) ; fac1 = fac2-fac1 mind the order of the operands
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romsub $fe18 = FADD(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 += mflpt value from A/Y
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romsub $fe1b = FADDT() clobbers(A,X,Y) ; fac1 += fac2
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romsub $fe1e = FMULT(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 *= mflpt value from A/Y
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romsub $fe21 = FMULTT() clobbers(A,X,Y) ; fac1 *= fac2
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romsub $fe24 = FDIV(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt in A/Y / fac1
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romsub $fe27 = FDIVT() clobbers(A,X,Y) ; fac1 = fac2/fac1 mind the order of the operands
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romsub $fe2a = LOG() clobbers(A,X,Y) ; fac1 = LN(fac1) (natural log)
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romsub $fe2d = INT() clobbers(A,X,Y) ; INT() truncates, use ROUND or FADDH first to round instead of trunc
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romsub $fe30 = SQR() clobbers(A,X,Y) ; fac1 = SQRT(fac1)
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romsub $fe33 = NEGOP() clobbers(A) ; switch the sign of fac1 (fac1 = -fac1)
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romsub $fe36 = FPWR(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = fac2 ** float in A/Y
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romsub $fe39 = FPWRT() clobbers(A,X,Y) ; fac1 = fac2 ** fac1
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romsub $fe3c = EXP() clobbers(A,X,Y) ; fac1 = EXP(fac1) (e ** fac1)
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romsub $fe3f = COS() clobbers(A,X,Y) ; fac1 = COS(fac1)
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romsub $fe42 = SIN() clobbers(A,X,Y) ; fac1 = SIN(fac1)
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romsub $fe45 = TAN() clobbers(A,X,Y) ; fac1 = TAN(fac1)
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romsub $fe48 = ATN() clobbers(A,X,Y) ; fac1 = ATN(fac1)
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romsub $fe4b = ROUND() clobbers(A,X,Y) ; round fac1
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romsub $fe4e = ABS() clobbers(A,X,Y) ; fac1 = ABS(fac1)
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romsub $fe51 = SIGN() clobbers(X,Y) -> ubyte @ A ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
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romsub $fe54 = 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 $fe57 = RND_0() clobbers(A,X,Y) ; fac1 = RND(fac1) float random number generator NOTE: incompatible with C64's RND routine
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romsub $fe57 = RND() clobbers(A,X,Y) ; alias for RND_0
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romsub $fe5a = CONUPK(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac2
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romsub $fe5d = 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 $fe60 = 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 $fe63 = MOVFM(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory in A/Y into fac1
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romsub $fe66 = MOVMF(uword mflpt @ XY) clobbers(A,X,Y) ; store fac1 to memory X/Y as 5-byte mflpt
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romsub $fe69 = MOVFA() clobbers(A,X) ; copy fac2 to fac1
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romsub $fe6c = MOVAF() clobbers(A,X) ; copy fac1 to fac2 (rounded)
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; X16 additions
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romsub $fe6f = FADDH() clobbers(A,X,Y) ; fac1 += 0.5, for rounding- call this before INT
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romsub $fe72 = ZEROFC() clobbers(A,X,Y) ; fac1 = 0
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romsub $fe75 = NORMAL() clobbers(A,X,Y) ; normalize fac1
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romsub $fe78 = NEGFAC() clobbers(A) ; switch the sign of fac1 (fac1 = -fac1) (doesn't work, juse use NEGOP() instead!)
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romsub $fe7b = MUL10() clobbers(A,X,Y) ; fac1 *= 10
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romsub $fe7e = DIV10() clobbers(A,X,Y) ; fac1 /= 10 , CAUTION: result is always positive! Have to restore sign manually!
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romsub $fe81 = MOVEF() clobbers(A,X) ; copy fac1 to fac2
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romsub $fe84 = SGN() clobbers(A,X,Y) ; fac1 = SGN(fac1), result of SIGN (-1, 0 or 1)
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romsub $fe87 = FLOAT() clobbers(A,X,Y) ; FAC = (s8).A
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romsub $fe8a = FLOATS() clobbers(A,X,Y) ; FAC = (s16)facho+1:facho
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romsub $fe8d = QINT() clobbers(A,X,Y) ; facho:facho+1:facho+2:facho+3 = u32(FAC)
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romsub $fe90 = FINLOG(byte value @A) clobbers (A, X, Y) ; fac1 += signed byte in A
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asmsub FREADSA (byte value @A) clobbers(A,X,Y) {
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; ---- 8 bit signed A -> float in fac1
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%asm {{
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tay
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bpl +
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lda #$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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sty $c4 ; facmo ($64 on c128)
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sta $c5 ; facmo+1 ($65 on c128)
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ldx #$90
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sec
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jmp FLOATC
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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 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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lda #0
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jmp GIVAYF
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}}
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}
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asmsub parse(str value @AY) -> float @FAC1 {
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; -- parse a string value of a number to float in FAC1
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; warning: on older <R47 kernals it uses an internal BASIC routine that is ROM version dependent,
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; ($deb6 is inside the routine for VAL at $deb3) See basic.sym from x16-rom
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; TODO once ROM v47 is released, all the workarounds here can be removed. But probably keep the kernal VAL_1 existance check
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%asm {{
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ldx VAL_1
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cpx #$4c ; is there an implementation in VAL_1? (test for JMP)
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bne + ; no, do it ourselves
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pha ; yes, count the length and call rom VAL_1.
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phy
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jsr prog8_lib.strlen
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tya
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ply
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plx
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jmp VAL_1
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+ sta $a9 ; 'index' variable
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sty $aa
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jsr prog8_lib.strlen
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lda $deb6
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cmp #$d0 ; sanity check for kernal routine correct
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bne +
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tya
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jmp $deb6 ; kernal version dependent...
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+ ; print error message if routine is borked in kernal, and exit program
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ldy #0
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- lda _msg,y
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beq +
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jsr cbm.CHROUT
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iny
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bne -
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+ jmp sys.exit
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_msg .text 13,"?val kaputt",13,0
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}}
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}
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&uword AYINT_facmo = $c6 ; $c6/$c7 contain result of AYINT
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sub rnd() -> float {
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%asm {{
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lda #1
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jmp RND_0
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}}
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}
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asmsub normalize(float value @FAC1) -> float @ FAC1 {
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%asm {{
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jmp floats.NORMAL
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}}
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}
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%asminclude "library:c64/floats.asm"
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%asminclude "library:c64/floats_funcs.asm"
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}
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