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158 lines
6.4 KiB
Lua
158 lines
6.4 KiB
Lua
; Prog8 definitions for floating point handling on the Commodore 128
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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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%option enable_floats
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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 $af09 = VAL(ubyte length @ A) clobbers(A,X,Y) ; str -> fac1, $24/25 must point to string in bank1, A=string length Don't call this from bank0
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; fac1 -> unsigned word in Y/A (might throw ILLEGAL QUANTITY) (result also in $16/17)
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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 $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
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romsub $af18 = FADD(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 += mflpt value from A/Y in bank 1
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romsub $af1b = FADDT() clobbers(A,X,Y) ; fac1 += fac2
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romsub $af2a = LOG() clobbers(A,X,Y) ; fac1 = LN(fac1) (natural log)
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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
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romsub $af5a = CONUPK(uword mflpt @ AY) clobbers(A,X,Y) ; load mflpt value from memory bank 1 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 $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
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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 $af60 = MOVFRM() clobbers(A,X,Y) ; load mflpt value from memory in $24/$25 into fac2
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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
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romsub $af6c = MOVEF() clobbers(A,X) ; copy fac1 to fac2
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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 $af4e = ABS() clobbers(A,X,Y) ; fac1 = ABS(fac1)
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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 $af2d = INT() clobbers(A,X,Y) ; INT() truncates, use FADDH first to round instead of trunc
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romsub $af06 = FOUT() clobbers(X) -> uword @ AY ; fac1 -> string, address returned in AY ($0100)
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romsub $af30 = SQR() clobbers(A,X,Y) ; fac1 = SQRT(fac1)
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romsub $af36 = FPWR(uword mflpt @ AY) clobbers(A,X,Y) ; fac1 = fac2 ** mflpt from A/Y
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romsub $af39 = FPWRT() clobbers(A,X,Y) ; fac1 = fac2 ** fac1
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romsub $af33 = NEGOP() clobbers(A) ; switch the sign of fac1 (fac1 = -fac1)
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romsub $af3c = EXP() clobbers(A,X,Y) ; fac1 = EXP(fac1) (e ** fac1)
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romsub $af57 = RND() clobbers(A,X,Y) ; fac1 = RND(fac1) float random number generator
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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 $af48 = ATN() clobbers(A,X,Y) ; fac1 = ATN(fac1)
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asmsub FREADSA (byte value @A) clobbers(A,X,Y) {
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; ---- 8 bit signed A -> float in fac1
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%asm {{
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tay
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bpl +
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lda #$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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stx P8ZP_SCRATCH_REG
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sta _tmp
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sty P8ZP_SCRATCH_B1
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tya
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ldy _tmp
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jsr GIVAYF ; load it as signed... correct afterwards
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lda P8ZP_SCRATCH_B1
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bpl +
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lda #<_flt65536
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ldy #>_flt65536
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jsr ROMUPK
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jsr FADDT
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+ ldx P8ZP_SCRATCH_REG
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rts
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_tmp .byte 0
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_flt65536 .byte 145,0,0,0,0 ; 65536.0
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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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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 P8ZP_SCRATCH_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 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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