mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-06-08 03:29:32 +00:00
194 lines
5.6 KiB
ArmAsm
194 lines
5.6 KiB
ArmAsm
; Shared subroutines for all demos
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;
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; Load the GTE User Tool and install it
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;
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; A = Engine Mode
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GTEStartUp
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pha ; Save engine mode
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pea $0000
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_LoaderStatus
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pla
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pea $0000
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pea $0000
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pea $0000
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pea $0000
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pea $0000 ; result space
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lda MyUserId
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pha
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pea #^ToolPath
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pea #ToolPath
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pea $0001 ; do not load into special memory
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_InitialLoad
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bcc *+4
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brk $01
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ply
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pla ; Address of the loaded tool
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plx
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ply
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ply
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pea $8000 ; User toolset
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pea $00A0 ; Set the tool set number
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phx
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pha ; Address of function pointer table
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_SetTSPtr
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bcc *+4
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brk $02
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plx ; Pop the Engine Mode value
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clc ; Give GTE a page of direct page memory
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tdc
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adc #$0100
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pha
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phx
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lda MyUserId ; Pass the userId for memory allocation
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pha
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_GTEStartUp
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bcc *+4
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brk $03
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rts
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ToolPath str '1/Tool160'
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; Generic key handling common to all demos
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;
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; A = result from GTEReadControl (preserved)
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; C = 1 if not handled
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; C = 0 if handled
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HandleKeys
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pha
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and #$007F
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cmp #'q'
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bne :not_q
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lda #Exit-1 ; replace the return address with the exit
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sta 1,s
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rts
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:not_q
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cmp #'1'
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bcc :not_digit
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cmp #':' ; next character after '9'
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bcs :not_digit
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sec
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sbc #'1'
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pha
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pea $0000
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_GTESetScreenMode
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_GTERefresh
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jsr SetLimits
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bra :handled
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:not_digit
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bra :unhandled
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:handled pla
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clc
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rts
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:unhandled pla
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sec
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rts
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_Deref MAC
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phb ; save caller's data bank register
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pha ; push high word of handle on stack
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plb ; sets B to the bank byte of the pointer
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lda |$0002,x ; load the high word of the master pointer
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pha ; and save it on the stack
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lda |$0000,x ; load the low word of the master pointer
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tax ; and return it in X
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pla ; restore the high word in A
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plb ; pull the handle's high word high byte off the
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; stack
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plb ; restore the caller's data bank register
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<<<
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AllocBank PushLong #0
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PushLong #$10000
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PushWord MyUserId
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PushWord #%11000000_00011100
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PushLong #0
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_NewHandle
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plx ; base address of the new handle
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pla ; high address 00XX of the new handle (bank)
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_Deref
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rts
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; Shared I/O
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; Basic I/O function to load files
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LoadFile
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stx openRec+4 ; X=File, A=Bank (high word) assumed zero for low
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stz readRec+4
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sta readRec+6
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phb
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phb
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pla
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and #$00FF
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sta openRec+6
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:openFile _OpenGS openRec
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bcs :openReadErr
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lda openRec+2
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sta eofRec+2
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sta readRec+2
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_GetEOFGS eofRec
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lda eofRec+4
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sta readRec+8
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lda eofRec+6
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sta readRec+10
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_ReadGS readRec
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bcs :openReadErr
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:closeFile _CloseGS closeRec
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clc
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lda eofRec+4 ; File Size
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rts
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:openReadErr jsr :closeFile
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nop
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nop
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PushWord #0
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PushLong #msgLine1
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PushLong #msgLine2
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PushLong #msgLine3
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PushLong #msgLine4
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_TLTextMountVolume
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pla
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cmp #1
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bne :loadFileErr
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brl :openFile
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:loadFileErr sec
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rts
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msgLine1 str 'Unable to load File'
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msgLine2 str 'Press a key :'
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msgLine3 str ' -> Return to Try Again'
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msgLine4 str ' -> Esc to Quit'
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openRec dw 2 ; pCount
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ds 2 ; refNum
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ds 4 ; pathname
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eofRec dw 2 ; pCount
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ds 2 ; refNum
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ds 4 ; eof
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readRec dw 4 ; pCount
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ds 2 ; refNum
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ds 4 ; dataBuffer
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ds 4 ; requestCount
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ds 4 ; transferCount
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closeRec dw 1 ; pCount
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ds 2 ; refNum
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