mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-25 15:32:59 +00:00
194 lines
5.6 KiB
ArmAsm
194 lines
5.6 KiB
ArmAsm
; Shared subroutines for all demos
|
|
;
|
|
; Load the GTE User Tool and install it
|
|
;
|
|
; A = Engine Mode
|
|
GTEStartUp
|
|
pha ; Save engine mode
|
|
|
|
pea $0000
|
|
_LoaderStatus
|
|
pla
|
|
|
|
pea $0000
|
|
pea $0000
|
|
pea $0000
|
|
pea $0000
|
|
pea $0000 ; result space
|
|
|
|
lda MyUserId
|
|
pha
|
|
|
|
pea #^ToolPath
|
|
pea #ToolPath
|
|
pea $0001 ; do not load into special memory
|
|
_InitialLoad
|
|
bcc *+4
|
|
brk $01
|
|
|
|
ply
|
|
pla ; Address of the loaded tool
|
|
plx
|
|
ply
|
|
ply
|
|
|
|
pea $8000 ; User toolset
|
|
pea $00A0 ; Set the tool set number
|
|
phx
|
|
pha ; Address of function pointer table
|
|
_SetTSPtr
|
|
bcc *+4
|
|
brk $02
|
|
|
|
plx ; Pop the Engine Mode value
|
|
|
|
clc ; Give GTE a page of direct page memory
|
|
tdc
|
|
adc #$0100
|
|
pha
|
|
phx
|
|
lda MyUserId ; Pass the userId for memory allocation
|
|
pha
|
|
_GTEStartUp
|
|
bcc *+4
|
|
brk $03
|
|
|
|
rts
|
|
|
|
ToolPath str '1/Tool160'
|
|
|
|
; Generic key handling common to all demos
|
|
;
|
|
; A = result from GTEReadControl (preserved)
|
|
; C = 1 if not handled
|
|
; C = 0 if handled
|
|
HandleKeys
|
|
pha
|
|
and #$007F
|
|
|
|
cmp #'q'
|
|
bne :not_q
|
|
lda #Exit-1 ; replace the return address with the exit
|
|
sta 1,s
|
|
rts
|
|
|
|
:not_q
|
|
cmp #'1'
|
|
bcc :not_digit
|
|
cmp #':' ; next character after '9'
|
|
bcs :not_digit
|
|
sec
|
|
sbc #'1'
|
|
pha
|
|
pea $0000
|
|
_GTESetScreenMode
|
|
_GTERefresh
|
|
jsr SetLimits
|
|
bra :handled
|
|
|
|
:not_digit
|
|
bra :unhandled
|
|
|
|
:handled pla
|
|
clc
|
|
rts
|
|
|
|
:unhandled pla
|
|
sec
|
|
rts
|
|
|
|
_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
|
|
<<<
|
|
|
|
AllocBank PushLong #0
|
|
PushLong #$10000
|
|
PushWord MyUserId
|
|
PushWord #%11000000_00011100
|
|
PushLong #0
|
|
_NewHandle
|
|
plx ; base address of the new handle
|
|
pla ; high address 00XX of the new handle (bank)
|
|
_Deref
|
|
rts
|
|
|
|
; Shared I/O
|
|
; Basic I/O function to load files
|
|
LoadFile
|
|
stx openRec+4 ; X=File, A=Bank (high word) assumed zero for low
|
|
stz readRec+4
|
|
sta readRec+6
|
|
phb
|
|
phb
|
|
pla
|
|
and #$00FF
|
|
sta openRec+6
|
|
|
|
:openFile _OpenGS openRec
|
|
bcs :openReadErr
|
|
lda openRec+2
|
|
sta eofRec+2
|
|
sta readRec+2
|
|
|
|
_GetEOFGS eofRec
|
|
lda eofRec+4
|
|
sta readRec+8
|
|
lda eofRec+6
|
|
sta readRec+10
|
|
|
|
_ReadGS readRec
|
|
bcs :openReadErr
|
|
|
|
:closeFile _CloseGS closeRec
|
|
clc
|
|
lda eofRec+4 ; File Size
|
|
rts
|
|
|
|
:openReadErr jsr :closeFile
|
|
nop
|
|
nop
|
|
|
|
PushWord #0
|
|
PushLong #msgLine1
|
|
PushLong #msgLine2
|
|
PushLong #msgLine3
|
|
PushLong #msgLine4
|
|
_TLTextMountVolume
|
|
pla
|
|
cmp #1
|
|
bne :loadFileErr
|
|
brl :openFile
|
|
:loadFileErr sec
|
|
rts
|
|
|
|
msgLine1 str 'Unable to load File'
|
|
msgLine2 str 'Press a key :'
|
|
msgLine3 str ' -> Return to Try Again'
|
|
msgLine4 str ' -> Esc to Quit'
|
|
|
|
openRec dw 2 ; pCount
|
|
ds 2 ; refNum
|
|
ds 4 ; pathname
|
|
|
|
eofRec dw 2 ; pCount
|
|
ds 2 ; refNum
|
|
ds 4 ; eof
|
|
|
|
readRec dw 4 ; pCount
|
|
ds 2 ; refNum
|
|
ds 4 ; dataBuffer
|
|
ds 4 ; requestCount
|
|
ds 4 ; transferCount
|
|
|
|
closeRec dw 1 ; pCount
|
|
ds 2 ; refNum
|