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https://frontier.innolan.net/github/AmigaExamples.git
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179 lines
3.1 KiB
ArmAsm
179 lines
3.1 KiB
ArmAsm
include "includes.i"
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xdef copperList
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xdef onscreen
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xdef offscreen
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xdef copperListBpl1Ptr
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xdef copperListBpl2Ptr
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xdef backgroundTiles
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byteMap:
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dc.l Entry
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dc.l endCode-byteMap
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Entry:
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lea userstack,a7
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lea CUSTOM,a6
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move #$7ff,DMACON(a6) ; disable all dma
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move #$7fff,INTENA(a6) ; disable all interrupts
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jsr InstallPalette
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lea Level3InterruptHandler,a3
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move.l a3,LVL3_INT_VECTOR
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jsr SwitchBuffers
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move.w #(INTF_SETCLR|INTF_VERTB|INTF_INTEN),INTENA(a6)
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move.w #(DMAF_BLITTER|DMAF_SETCLR!DMAF_MASTER),DMACON(a6)
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jsr Init ; enable the playfield
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Reset:
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move.l #0,d1 ; x pos
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move.l #0,d2 ; shift counter
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move.l #0,d3 ; tile index
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jsr BlueFill
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MainLoop:
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jsr WaitVerticalBlank
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jsr WaitVerticalBlank
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bsr RenderNextFrame
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jsr UpdateShiftCounter
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add.l #1,d1
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jsr SwitchBuffers ; takes bitplane pointer offset in d0
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bra MainLoop
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RenderNextFrame:
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move.l d1,d0 ; x position in pixels
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lea map,a2
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add.l d3,a2
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cmp.w #0,20(a2)
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bne .skip
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bra Reset
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.skip:
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jsr HoriScrollPlayfield ; returns bitplane pointer offset in d0
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move.l onscreen,a0
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bsr RenderTile
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move.l offscreen,a0
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bsr RenderTile
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add.l #2,d3 ; increment tile index
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rts
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RenderTile:
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;; a0 - dest bitplane
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;; d0 - x position in pixels
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add.l d0,a0
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lea tilemap,a1
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add.l #BITPLANE_WIDTH_BYTES-2,a0 ; dest
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add.w (a2),a1 ; source tile
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jsr BlitTile
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rts
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UpdateShiftCounter:
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cmp.l #15,d2
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bne .s1
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move.l #0,d2
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bra .s2
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.s1:
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add.l #1,d2
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.s2:
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rts
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Level3InterruptHandler:
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movem.l d0-a6,-(sp)
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lea CUSTOM,a6
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.checkVerticalBlank:
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move.w INTREQR(a6),d0
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and.w #INTF_VERTB,d0
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beq.s .checkCopper
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.verticalBlank:
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move.w #INTF_VERTB,INTREQ(a6) ; clear interrupt bit
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.checkCopper:
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move.w INTREQR(a6),d0
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and.w #INTF_COPER,d0
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beq.s .interruptComplete
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.copperInterrupt:
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move.w #INTF_COPER,INTREQ(a6) ; clear interrupt bit
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.interruptComplete:
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movem.l (sp)+,d0-a6
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rte
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copperList:
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copperListBpl1Ptr:
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;; this is where bitplanes are assigned to playfields
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;; http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node0079.html
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;; 3 bitplanes per playfield, playfield1 gets bitplanes 1,3,5
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dc.w BPL1PTL,0
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dc.w BPL1PTH,0
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dc.w BPL3PTL,0
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dc.w BPL3PTH,0
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dc.w BPL5PTL,0
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dc.w BPL5PTH,0
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copperListBpl2Ptr:
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;; 3 bitplanes per playfield, playfield2 gets bitplanes 2,4,6
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dc.w BPL2PTL,0
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dc.w BPL2PTH,0
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dc.w BPL4PTL,0
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dc.w BPL4PTH,0
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dc.w BPL6PTL,0
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dc.w BPL6PTH,0
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dc.l $fffffffe
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if 0
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copperList:
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copperListBplPtr:
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dc.w BPL1PTL,0
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dc.w BPL1PTH,0
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dc.w BPL2PTL,0
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dc.w BPL2PTH,0
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dc.w BPL3PTL,0
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dc.w BPL3PTH,0
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dc.w BPL4PTL,0
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dc.w BPL4PTH,0
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dc.w BPL5PTL,0
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dc.w BPL5PTH,0
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dc.w BPL6PTL,0
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dc.w BPL6PTH,0
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dc.l $fffffffe
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endif
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InstallPalette:
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include "out/2222-palette.s"
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rts
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onscreen:
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dc.l bitplanes1
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offscreen:
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dc.l bitplanes2
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tilemap:
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incbin "out/2222.bin"
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bitplanes1:
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ds.b IMAGESIZE
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ds.b BITPLANE_WIDTH_BYTES*20
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bitplanes2:
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ds.b IMAGESIZE
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ds.b BITPLANE_WIDTH_BYTES*20
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map:
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include "out/main-map.s"
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dc.w 0
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backgroundTiles:
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include "out/background_tiles.bin"
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section .bss
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startUserstack:
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ds.b $1000 ; size of stack
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userstack:
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