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202 lines
8.2 KiB
Lua
202 lines
8.2 KiB
Lua
; Prog8 definitions for floating point handling on the Commodore-64
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;
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; Written by Irmen de Jong (irmen@razorvine.net) - license: GNU GPL 3.0
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;
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; indent format: TABS, size=8
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%target c64
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%option enable_floats
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floats {
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; ---- this block contains C-64 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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; ---- C64 basic and kernal ROM float constants and 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 $bba2 = MOVFM(uword mflpt @ AY) clobbers(A,Y) ; load mflpt value from memory in A/Y into fac1
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romsub $bba6 = FREADMEM() clobbers(A,Y) ; load mflpt value from memory in $22/$23 into fac1
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romsub $ba8c = CONUPK(uword mflpt @ AY) clobbers(A,Y) ; load mflpt value from memory in A/Y into fac2
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romsub $ba90 = FAREADMEM() clobbers(A,Y) ; load mflpt value from memory in $22/$23 into fac2
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romsub $bbfc = MOVFA() clobbers(A,X) ; copy fac2 to fac1
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romsub $bc0c = MOVAF() clobbers(A,X) ; copy fac1 to fac2 (rounded)
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romsub $bc0f = MOVEF() clobbers(A,X) ; copy fac1 to fac2
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romsub $bbd4 = MOVMF(uword mflpt @ XY) clobbers(A,Y) ; store fac1 to memory X/Y as 5-byte mflpt
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; fac1-> signed word in Y/A (might throw ILLEGAL QUANTITY)
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; (tip: use floats.FTOSWRDAY to get A/Y output; lo/hi switched to normal little endian order)
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romsub $b1aa = FTOSWORDYA() clobbers(X) -> ubyte @ Y, ubyte @ A ; note: calls AYINT.
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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 floats.GETADRAY to get A/Y output; lo/hi switched to normal little endian order)
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romsub $b7f7 = GETADR() clobbers(X) -> ubyte @ Y, ubyte @ A
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romsub $bc9b = QINT() clobbers(A,X,Y) ; fac1 -> 4-byte signed integer in 98-101 ($62-$65), with the MSB FIRST.
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romsub $b1bf = 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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; (tip: use floats.GIVAYFAY to use A/Y input; lo/hi switched to normal order)
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; there is also floats.GIVUAYFAY - unsigned word in A/Y (lo/hi) to fac1
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; there is also floats.FREADS32 that reads from 98-101 ($62-$65) MSB FIRST
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; there is also floats.FREADUS32 that reads from 98-101 ($62-$65) MSB FIRST
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; there is also floats.FREADS24AXY that reads signed int24 into fac1 from A/X/Y (lo/mid/hi bytes)
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romsub $b391 = GIVAYF(ubyte lo @ Y, ubyte hi @ A) clobbers(A,X,Y)
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romsub $b3a2 = FREADUY(ubyte value @ Y) clobbers(A,X,Y) ; 8 bit unsigned Y -> float in fac1
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romsub $bc3c = FREADSA(byte value @ A) clobbers(A,X,Y) ; 8 bit signed A -> float in fac1
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romsub $b7b5 = FREADSTR(ubyte length @ A) clobbers(A,X,Y) ; str -> fac1, $22/23 must point to string, A=string length
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romsub $aabc = FPRINTLN() clobbers(A,X,Y) ; print string of fac1, on one line (= with newline) destroys fac1. (consider FOUT + STROUT as well)
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romsub $bddd = FOUT() clobbers(X) -> uword @ AY ; fac1 -> string, address returned in AY ($0100)
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romsub $b849 = FADDH() clobbers(A,X,Y) ; fac1 += 0.5, for rounding- call this before INT
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romsub $bae2 = MUL10() clobbers(A,X,Y) ; fac1 *= 10
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romsub $bafe = DIV10() clobbers(A,X,Y) ; fac1 /= 10 , CAUTION: result is always positive!
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romsub $bc5b = 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 $b86a = FADDT() clobbers(A,X,Y) ; fac1 += fac2
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romsub $b867 = FADD(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 += mflpt value from A/Y
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romsub $b853 = FSUBT() clobbers(A,X,Y) ; fac1 = fac2-fac1 mind the order of the operands
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romsub $b850 = FSUB(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt from A/Y - fac1
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romsub $ba2b = FMULTT() clobbers(A,X,Y) ; fac1 *= fac2
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romsub $ba28 = FMULT(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 *= mflpt value from A/Y
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romsub $bb12 = FDIVT() clobbers(A,X,Y) ; fac1 = fac2/fac1 (remainder in fac2) mind the order of the operands
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romsub $bb0f = FDIV(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = mflpt in A/Y / fac1 (remainder in fac2)
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romsub $bf7b = FPWRT() clobbers(A,X,Y) ; fac1 = fac2 ** fac1
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romsub $bf78 = FPWR(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = fac2 ** mflpt from A/Y
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romsub $bd7e = FINLOG(byte value @A) clobbers (A, X, Y) ; fac1 += signed byte in A
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romsub $aed4 = NOTOP() clobbers(A,X,Y) ; fac1 = NOT(fac1)
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romsub $bccc = INT() clobbers(A,X,Y) ; INT() truncates, use FADDH first to round instead of trunc
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romsub $b9ea = LOG() clobbers(A,X,Y) ; fac1 = LN(fac1) (natural log)
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romsub $bc39 = SGN() clobbers(A,X,Y) ; fac1 = SGN(fac1), result of SIGN (-1, 0 or 1)
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romsub $bc2b = SIGN() -> ubyte @ A ; SIGN(fac1) to A, $ff, $0, $1 for negative, zero, positive
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romsub $bc58 = ABS() ; fac1 = ABS(fac1)
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romsub $bf71 = SQR() clobbers(A,X,Y) ; fac1 = SQRT(fac1)
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romsub $bf74 = SQRA() clobbers(A,X,Y) ; fac1 = SQRT(fac2)
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romsub $bfed = EXP() clobbers(A,X,Y) ; fac1 = EXP(fac1) (e ** fac1)
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romsub $bfb4 = NEGOP() clobbers(A) ; switch the sign of fac1
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romsub $e097 = RND() clobbers(A,X,Y) ; fac1 = RND(fac1) float random number generator
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romsub $e264 = COS() clobbers(A,X,Y) ; fac1 = COS(fac1)
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romsub $e26b = SIN() clobbers(A,X,Y) ; fac1 = SIN(fac1)
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romsub $e2b4 = TAN() clobbers(A,X,Y) ; fac1 = TAN(fac1)
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romsub $e30e = ATN() clobbers(A,X,Y) ; fac1 = ATN(fac1)
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asmsub FREADS32() clobbers(A,X,Y) {
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; ---- fac1 = signed int32 from $62-$65 big endian (MSB FIRST)
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%asm {{
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lda $62
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eor #$ff
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asl a
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lda #0
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ldx #$a0
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jmp $bc4f ; internal BASIC routine
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}}
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}
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asmsub FREADUS32 () clobbers(A,X,Y) {
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; ---- fac1 = uint32 from $62-$65 big endian (MSB FIRST)
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%asm {{
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sec
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lda #0
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ldx #$a0
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jmp $bc4f ; internal BASIC routine
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}}
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}
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asmsub FREADS24AXY (ubyte lo @ A, ubyte mid @ X, ubyte hi @ Y) clobbers(A,X,Y) {
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; ---- fac1 = signed int24 (A/X/Y contain lo/mid/hi bytes)
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; note: there is no FREADU24AXY (unsigned), use FREADUS32 instead.
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%asm {{
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sty $62
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stx $63
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sta $64
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lda $62
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eor #$FF
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asl a
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lda #0
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sta $65
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ldx #$98
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jmp $bc4f ; internal BASIC routine
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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 $62
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sta $63
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ldx #$90
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sec
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jmp $bc49 ; internal BASIC routine
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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_REG
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tya
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ldy P8ZP_SCRATCH_REG
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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_REG
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tya
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ldy P8ZP_SCRATCH_REG
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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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sub print_f (float value) {
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; ---- prints the floating point value (without a newline).
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%asm {{
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stx floats_store_reg
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lda #<value
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ldy #>value
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jsr MOVFM ; load float into fac1
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jsr FOUT ; fac1 to string in A/Y
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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ldy #0
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- lda (P8ZP_SCRATCH_W1),y
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beq +
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jsr c64.CHROUT
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iny
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bne -
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+ ldx floats_store_reg
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rts
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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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