148 lines
2.8 KiB
ArmAsm
148 lines
2.8 KiB
ArmAsm
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; ____________________________________________________________________________
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;
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; AMOS Complex mask calculation
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;
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; [Number,Colour0,Colour1]
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; ____________________________________________________________________________
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OPT P+
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Include "|AMOS_Includes.s"
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; ____________________________________________________________________________
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; Look for the sprite bank
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; ~~~~~~~~~~~~~~~~~~~~~~~~
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bsr Bnk_GetBobs
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beq Erreur
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; Get the parameters back
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; ~~~~~~~~~~~~~~~~~~~~~~~
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move.l (a3)+,d2 Colour 2
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move.l (a3)+,d1 Colour 1
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move.l (a3)+,d0 Number of the bob
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; Parameter check
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; ~~~~~~~~~~~~~~~
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tst.w d0
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ble Erreur
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cmp.w (a0)+,d0 > of available sprites
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bhi Erreur
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lsl.w #3,d0
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lea -8(a0,d0.w),a5 Adress of the bobs
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move.l (a5)+,d0
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beq Erreur
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move.l d0,a4 A4= SpriteBase
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* Built up table
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lea Table(pc),a0
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cmp.l (a0),d1
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bne.s DoTable
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cmp.l 4(a0),d2
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beq.s PaTable
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DoTable move.l d1,(a0)+
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move.l d2,(a0)+
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moveq #64-1,d0
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Table0 clr.b (a0)
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lsr.l #1,d1
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roxr.l #1,d2
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bcc.s Table1
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subq.b #1,(a0)
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Table1 addq.l #1,a0
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dbra d0,Table0
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PaTable
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* Calculation of mask size
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move.w (a4),d7 TX
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lsl.w #1,d7 En mots
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mulu 2(a4),d7 fois TY
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* Reserve memory (if needed)
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move.l (a5),d0
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beq.s Reserve
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bpl.s DejaLa
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Reserve move.l d7,d0
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addq.l #4,d0
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move.l d0,d2
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move.l $4,a6
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move.l #Chip|Public,d1 CHIP memory only
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jsr _LVOAllocMem(a6)
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move.l d0,(a5)
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beq Erreur
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move.l d0,a0
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move.l d2,(a0)+ Loke the size
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DejaLa move.l d0,a2
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addq.l #4,a2
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* Loop initialisation
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move.l d7,d6 D6-> Size of one memory plane
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subq.l #1,d7 D7-> Byte counter
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move.w 4(a4),d5 Number of planes
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subq.w #1,d5 D5-> Plane counter reload
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lea 10(a4),a1 A1-> Bitmap base
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; A2-> Mask address
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lea Table+8(pc),a3 A3-> Mask table
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* Calculation loop
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.loop0 moveq #7,d3 D3-> Bit counter
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.loop1 moveq #0,d0 D0-> Color calculation
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moveq #0,d1 D1-> Bit position
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move.w d5,d2 D2-> Plane counter
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move.l a1,a0 A0-> Point to current byte
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.loop2 btst d3,(a0)
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beq.s .loop3
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bset d1,d0
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.loop3 add.l d6,a0 Next plane
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addq.w #1,d1
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dbra d2,.loop2
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bset d3,(a2)
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tst.b 0(a3,d0.w) Transparent colour?
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beq.s .loop4
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bclr d3,(a2)
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.loop4
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dbra d3,.loop1 Still one bit?
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addq.l #1,a1
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addq.l #1,a2
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dbra d7,.loop0 Still one byte?
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* All done, no errors
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moveq #0,d0
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rts
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* An error
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Erreur moveq #-1,d0
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rts
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; Finds a bank adress
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; ~~~~~~~~~~~~~~~~~~~
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Bnk_GetAdr
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move.l Cur_Banks(a5),a0
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move.l (a0),d1
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beq.s .Nof
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.Loop move.l d1,a1
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cmp.l 8(a1),d0
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beq.s .Fnd
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move.l (a1),d1
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bne.s .Loop
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.Nof sub.l a1,a1
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move.l a1,a0
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rts
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.Fnd move.w 8+4(a1),d0
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lea 8*3(a1),a0
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move.l a0,a1
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move.w #%00000,CCR
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rts
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; Finds bob bank address
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; ~~~~~~~~~~~~~~~~~~~~~~
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; OUT BNE found A0/A1=address (D0/D1 unchanged)
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Bnk_GetBobs
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movem.l d0/d1,-(sp)
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moveq #1,d0
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bsr Bnk_GetAdr
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beq.s .Nof
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btst #Bnk_BitBob,d0
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.Nof movem.l (sp)+,d0/d1
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rts
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******* Work table
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even
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Table ds.b 64+8
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even
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