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random number stuff
This commit is contained in:
Irmen de Jong
parent
80c69d83c6
commit
662ba6460a
@ -141,7 +141,7 @@ asmsub GIVAYF (lo: ubyte @ Y, hi: ubyte @ A) -> clobbers(A,X,Y) -> () = $b391
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asmsub FREADUY (unsigned: ubyte @ Y) -> clobbers(A,X,Y) -> () = $b3a2 ; 8 bit unsigned Y -> float in fac1
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asmsub FREADSA (signed: ubyte @ A) -> clobbers(A,X,Y) -> () = $bc3c ; 8 bit signed A -> float in fac1
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asmsub FREADSTR (length: ubyte @ A) -> clobbers(A,X,Y) -> () = $b7b5 ; str -> fac1, $22/23 must point to string, A=string length
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asmsub FPRINTLN () -> clobbers(A,X,Y) -> () = $aabc ; print string of fac1, on one line (= with newline)
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asmsub FPRINTLN () -> clobbers(A,X,Y) -> () = $aabc ; print string of fac1, on one line (= with newline) (consider FOUT + STROUT as well)
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asmsub FOUT () -> clobbers(X) -> (uword @ AY) = $bddd ; fac1 -> string, address returned in AY ($0100)
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asmsub FADDH () -> clobbers(A,X,Y) -> () = $b849 ; fac1 += 0.5, for rounding- call this before INT
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@ -169,8 +169,8 @@ asmsub ABS () -> clobbers() -> () = $bc58 ; fac1 = ABS(fac1)
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asmsub SQR () -> clobbers(A,X,Y) -> () = $bf71 ; fac1 = SQRT(fac1)
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asmsub EXP () -> clobbers(A,X,Y) -> () = $bfed ; fac1 = EXP(fac1) (e ** fac1)
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asmsub NEGOP () -> clobbers(A) -> () = $bfb4 ; switch the sign of fac1
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asmsub RND () -> clobbers(A,X,Y) -> () = $e097 ; fac1 = RND() (tip: use RNDA instead)
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asmsub RNDA (acc: ubyte @ A) -> clobbers(A,X,Y) -> () = $e09a ; fac1 = RND(A)
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asmsub RND () -> clobbers(A,X,Y) -> () = $e097 ; fac1 = RND() (tip: use RNDA instead) pseudo random number generator
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asmsub RNDA (acc: ubyte @ A) -> clobbers(A,X,Y) -> () = $e09a ; fac1 = RND(A) pseudo random number generator
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asmsub COS () -> clobbers(A,X,Y) -> () = $e264 ; fac1 = COS(fac1)
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asmsub SIN () -> clobbers(A,X,Y) -> () = $e26b ; fac1 = SIN(fac1)
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asmsub TAN () -> clobbers(A,X,Y) -> () = $e2b4 ; fac1 = TAN(fac1)
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@ -189,6 +189,7 @@ asmsub HOMECRSR () -> clobbers(A,X,Y) -> () = $E566 ; cursor to top left of sc
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; ---- C64 kernal routines ----
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asmsub STROUT (strptr: uword @ AY) -> clobbers(A, X, Y) -> () = $AB1E ; print null-terminated string (a bit slow, see if you can use c64scr.print_string instead)
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asmsub IRQDFRT () -> clobbers(A,X,Y) -> () = $EA31 ; default IRQ routine
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asmsub IRQDFEND () -> clobbers(A,X,Y) -> () = $EA81 ; default IRQ end/cleanup
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asmsub CINT () -> clobbers(A,X,Y) -> () = $FF81 ; (alias: SCINIT) initialize screen editor and video chip
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@ -21,6 +21,7 @@ asmsub init_system () -> clobbers(A,X,Y) -> () {
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; All three registers set to 0, status flags cleared.
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%asm {{
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sei
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jsr determine_start_rnd_seed
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cld
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lda #%00101111
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sta $00
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@ -41,6 +42,18 @@ asmsub init_system () -> clobbers(A,X,Y) -> () {
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clv
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cli
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rts
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determine_start_rnd_seed
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lda c64.TIME_HI
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adc c64.TIME_MID
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adc c64.TIME_LO
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ldy c64.RASTER
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sta start_rnd_seed
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sty start_rnd_seed+1
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rts
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start_rnd_seed .word $2c9e
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}}
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}
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@ -356,6 +369,52 @@ asmsub float_sub_SW1_from_XY (mflt: uword @ XY) -> clobbers(A,X,Y) -> () {
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}}
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}
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sub print_float (value: float) {
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; ---- prints the floating point value (without a newline) using basic rom routines.
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; clobbers no registers.
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%asm {{
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pha
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tya
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pha
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txa
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pha
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lda #<print_float_value
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ldy #>print_float_value
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jsr c64.MOVFM ; load float into fac1
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jsr c64.FOUT ; fac1 to string in A/Y
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jsr c64.STROUT ; print string in A/Y
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pla
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tax
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pla
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tay
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pla
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rts
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}}
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}
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sub print_float_ln (value: float) {
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; ---- prints the floating point value (with a newline at the end) using basic rom routines
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; clobbers no registers.
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%asm {{
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pha
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tya
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pha
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txa
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pha
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lda #<print_float_ln_value
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ldy #>print_float_ln_value
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jsr c64.MOVFM ; load float into fac1
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jsr c64.FPRINTLN ; print fac1 with newline
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pla
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tax
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pla
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tay
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pla
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rts
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}}
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}
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} ; ------ end of block c64flt
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@ -171,6 +171,34 @@ remainder = SCRATCH_ZP1
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}}
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}
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asmsub randseed (seed: uword @ AY) -> clobbers() -> () {
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; ---- reset the random seeds for the byte and word random generators
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; default starting values are: A=$2c Y=$9e
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%asm {{
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sta randword._seed
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sty randword._seed+1
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tya
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clc
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sbc #100
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sta randbyte._seed
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rts
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}}
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}
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asmsub randseedr () -> clobbers() -> () {
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; ---- initializes the byte and word random generators with the 'random' seed
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; that was stored when the program started. This can be used if you don't
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; want your program to use the same random number sequence every time it is loaded or runs.
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%asm {{
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lda c64utils.start_rnd_seed
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ldy c64utils.start_rnd_seed+1
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jsr math.randseed
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ora #$80 ; make negative
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jsr c64.RNDA ; reseed the float rng using the (negative) number in A
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rts
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}}
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}
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asmsub randbyte () -> clobbers() -> (ubyte @ A) {
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; ---- 8-bit pseudo random number generator into A
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@ -185,7 +213,7 @@ asmsub randbyte () -> clobbers() -> (ubyte @ A) {
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+ sta _seed
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rts
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_seed .byte $3a
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_seed .byte $3a
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_magic .byte $1d
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_magiceors .byte $1d, $2b, $2d, $4d, $5f, $63, $65, $69
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.byte $71, $87, $8d, $a9, $c3, $cf, $e7, $f5
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@ -11,6 +11,8 @@
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memory ubyte SCRATCH_ZP2 = $03 ; scratch register #2 in ZP
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memory uword SCRATCH_ZPWORD1 = $fb ; scratch word in ZP ($fb/$fc)
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memory uword SCRATCH_ZPWORD2 = $fd ; scratch word in ZP ($fd/$fe)
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const uword ESTACK_LO = $ce00
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const uword ESTACK_HI = $cf00
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%asm {{
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@ -28,7 +30,7 @@ ror2_word
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; @todo: stubs for now
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; @todo: implement stubs!
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; @todo: move float operations to their own library (only included when floats are enabled)
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ub2float
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@ -44,12 +46,57 @@ w2float
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rts
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push_float
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; ---- push mflpt5 in A/Y onto stack
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; (taking 3 stack positions = 6 bytes of which 1 is padding)
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sta SCRATCH_ZPWORD1
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sty SCRATCH_ZPWORD1+1
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ldy #0
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lda SCRATCH_ZPWORD1,y
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sta ESTACK_LO,x
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iny
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lda SCRATCH_ZPWORD1,y
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sta ESTACK_HI,x
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dex
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iny
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lda SCRATCH_ZPWORD1,y
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sta ESTACK_LO,x
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iny
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lda SCRATCH_ZPWORD1,y
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sta ESTACK_HI,x
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dex
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iny
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lda SCRATCH_ZPWORD1,y
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sta ESTACK_LO,x
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dex
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rts
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push_float_from_indexed_var
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rts
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pop_var_float
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pop_float
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; ---- pops mflpt5 from stack to memory A/Y @TODO CHECK ORDER OF POPS
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; (frees 3 stack positions = 6 bytes of which 1 is padding)
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sta SCRATCH_ZPWORD1
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sty SCRATCH_ZPWORD1+1
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ldy #4
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inx
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lda ESTACK_LO,x
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sta SCRATCH_ZPWORD1,y
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dey
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inx
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lda ESTACK_LO,x
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sta SCRATCH_ZPWORD1,y
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dey
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lda ESTACK_HI,x
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sta SCRATCH_ZPWORD1,y
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dey
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inx
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lda ESTACK_LO,x
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sta SCRATCH_ZPWORD1,y
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lda ESTACK_HI,x
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dey
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sta SCRATCH_ZPWORD1,y
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rts
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pop_float_to_indexed_var
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@ -59,6 +106,25 @@ pop_mem_float
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rts
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copy_float
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; -- copies the 5 bytes of the mflt value pointed to by SCRATCH_ZPWORD1,
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; into the 5 bytes pointed to by A/Y. Clobbers Y.
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sta SCRATCH_ZPWORD2
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sty SCRATCH_ZPWORD2+1
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ldy #0
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lda SCRATCH_ZPWORD1,y
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sta SCRATCH_ZPWORD2,y
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iny
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lda SCRATCH_ZPWORD1,y
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sta SCRATCH_ZPWORD2,y
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iny
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lda SCRATCH_ZPWORD1,y
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sta SCRATCH_ZPWORD2,y
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iny
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lda SCRATCH_ZPWORD1,y
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sta SCRATCH_ZPWORD2,y
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iny
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lda SCRATCH_ZPWORD1,y
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sta SCRATCH_ZPWORD2,y
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rts
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inc_var_f
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@ -243,12 +309,38 @@ func_any
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rts
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func_all
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rts
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func_rnd
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; -- put a random ubyte on the estack
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jsr math.randbyte
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sta ESTACK_LO,x
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dex
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rts
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func_rndw
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; -- put a random uword on the estack
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jsr math.randword
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sta ESTACK_LO,x
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tya
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sta ESTACK_HI,x
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dex
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rts
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func_rndf
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rts
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; -- put a random floating point value on the stack
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stx SCRATCH_ZP1
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lda #39
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jsr c64.RNDA ; rng into fac1
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ldx #<_rndf_rnum5
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ldy #>_rndf_rnum5
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jsr c64.FTOMEMXY ; fac1 to mem X/Y
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ldx SCRATCH_ZP1
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lda #<_rndf_rnum5
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ldy #>_rndf_rnum5
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jmp push_float
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_rndf_rnum5 .fill 5
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func_wrd
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rts
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func_uwrd
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