iigs-game-engine/macros/CORE.MACS.S

195 lines
4.9 KiB
ArmAsm
Raw Normal View History

****************************************
* Basic Error Macro *
****************************************
_Err mac
bcc NoErr
do ]0 ; (DO if true) Mu
jsr PgmDeath ; this is conditionally compiled if
str ]1 ; we pass in an error statement
else ; (ELSE)
jmp PgmDeath0 ; we just call the simpler error handler
fin ; (FIN)
NoErr eom
2020-08-23 05:25:39 +00:00
;
; Dereference a handle that is on the top of the stack
;
_Deref MAC
phb ; save caller's data bank register
pha ; push high word of handle on stack
plb ; sets B to the bank byte of the pointer
lda |$0002,x ; load the high word of the master pointer
pha ; and save it on the stack
lda |$0000,x ; load the low word of the master pointer
tax ; and return it in X
pla ; restore the high word in A
plb ; pull the handle's high word high byte off the
; stack
plb ; restore the caller's data bank register
<<<
_Mul128 mac
asl
asl
asl
asl
asl
asl
asl
<<<
; Possible optimization (assumes accumulator is <512). 8 cycles/5 bytes vs 14 cycles/7 bytes
; cmp #$0100
; xba
; ror
_Div16 mac
lsr
lsr
lsr
lsr
<<<
_R0W0 mac ; Read Bank 0 / Write Bank 0
ldal STATE_REG
and #$FFCF
stal STATE_REG
<<<
_R0W1 mac ; Read Bank 0 / Write Bank 1
ldal STATE_REG
ora #$0010
stal STATE_REG
<<<
_R1W1 mac ; Read Bank 0 / Write Bank 1
ldal STATE_REG
ora #$0030
stal STATE_REG
<<<
_PushReg mac ; Used to save/restore registers when calling subroutines.
pha
phx
phy
<<<
_PullReg mac
ply
plx
pla
<<<
_PushReg2 mac ; Variation to also save the P-register to preserve m/x
pha
phx
phy
php
<<<
_PullReg2 mac
plp
ply
plx
pla
<<<
phxy mac
phx
phy
<<<
plyx mac
ply
plx
<<<
jne mac
beq *+5
jmp ]1
<<<
jeq mac
bne *+5
jmp ]1
<<<
jmi mac
bpl *+5
jmp ]1
<<<
jpl mac
bmi *+5
jmp ]1
<<<
jcc mac
bcs *+5
jmp ]1
<<<
jcs mac
bcc *+5
jmp ]1
<<<
max mac
cmp ]1
bcs mout
lda ]1
mout <<<
min mac
cmp ]1
bcc mout
lda ]1
mout <<<
; Increment a value mod some number.
incmod mac
inc
cmp ]1
bcc out
lda #0
out <<<
decmod mac
dec
bpl out
lda ]1
dec
out <<<
adcmod mac
adc ]1
cmp ]2
bcc out
sbc ]2
out <<<
sbcmod mac
sbc ]1
bpl out
clc
adc ]2
out <<<
asr16 mac
cmp #$8000
ror
<<<
asr8 mac
cmp #$80
ror
<<<
; Macro to define script steps
ScriptStep MAC
IF #=]5
dw {]1+{{]5&#$000F}<<8}},]2,]3,]4
ELSE
dw ]1,]2,]3,]4
FIN
<<<