mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-25 00:30:48 +00:00
185 lines
4.8 KiB
ArmAsm
185 lines
4.8 KiB
ArmAsm
****************************************
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* Basic Error Macro *
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****************************************
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_Err mac
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bcc NoErr
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do ]0 ; (DO if true) Mu
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jsr PgmDeath ; this is conditionally compiled if
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str ]1 ; we pass in an error statement
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else ; (ELSE)
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jmp PgmDeath0 ; we just call the simpler error handler
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fin ; (FIN)
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NoErr eom
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;
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; Dereference a handle that is on the top of the stack
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;
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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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; Call _NewHandle, but track the allocation
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_TrackHandle mac
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_NewHandle
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bcs err
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ldx NumHandles
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lda 1,s
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sta Handles,x
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lda 3,s
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sta Handles+2,x
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txa
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adc #4
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sta NumHandles
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err
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<<<
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_Mul128 mac
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asl
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asl
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asl
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asl
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asl
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asl
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asl
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<<<
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; Possible optimization (assumes accumulator is <512). 8 cycles/5 bytes vs 14 cycles/7 bytes
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; cmp #$0100
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; xba
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; ror
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_Div16 mac
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lsr
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lsr
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lsr
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lsr
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<<<
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_R0W0 mac ; Read Bank 0 / Write Bank 0
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ldal STATE_REG
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and #$FFCF
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stal STATE_REG
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<<<
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_R0W1 mac ; Read Bank 0 / Write Bank 1
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ldal STATE_REG
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ora #$0010
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stal STATE_REG
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<<<
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_R1W1 mac ; Read Bank 0 / Write Bank 1
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ldal STATE_REG
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ora #$0030
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stal STATE_REG
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<<<
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_PushReg mac ; Used to save/restore registers when calling subroutines.
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pha
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phx
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phy
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<<<
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_PullReg mac
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ply
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plx
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pla
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<<<
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_PushReg2 mac ; Variation to also save the P-register to preserve m/x
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pha
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phx
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phy
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php
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<<<
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_PullReg2 mac
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plp
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ply
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plx
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pla
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<<<
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jne mac
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beq *+5
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jmp ]1
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<<<
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jeq mac
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bne *+5
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jmp ]1
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<<<
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jcc mac
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bcs *+5
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jmp ]1
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<<<
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jcs mac
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bcc *+5
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jmp ]1
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<<<
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min mac
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cmp ]1
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bcc mout
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lda ]1
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mout <<<
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; Increment a value mod some number.
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incmod mac
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inc
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cmp ]1
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bcc out
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lda #0
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out <<<
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decmod mac
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dec
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bpl out
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lda ]1
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dec
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out <<<
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adcmod mac
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adc ]1
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cmp ]2
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bcc out
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sbc ]2
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out <<<
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sbcmod mac
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sbc ]1
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bpl out
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clc
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adc ]2
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out <<<
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asr16 mac
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cmp #$8000
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ror
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<<<
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asr8 mac
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cmp #$80
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ror
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<<<
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; Macro to define script steps
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ScriptStep MAC
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IF #=]5
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dw {]1+{{]5&#$000F}<<8}},]2,]3,]4
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ELSE
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dw ]1,]2,]3,]4
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FIN
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<<<
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