170 lines
2.7 KiB
ArmAsm
170 lines
2.7 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 copperListBplPtr
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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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move.l onscreen,a0
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move.l #BACKGROUND_COLOR,d0
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move.w #SCREEN_HEIGHT,d1
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move.w #0,d2 ; ypos
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jsr BlitFillColor
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move.l offscreen,a0
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move.l #BACKGROUND_COLOR,d0
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move.w #SCREEN_HEIGHT,d1
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move.w #0,d2 ; ypos
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jsr BlitFillColor
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WaitBlitter
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jsr Init ; enable the playfield
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MainLoop:
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jsr WaitVerticalBlank
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jsr InstallPalette
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move.l offscreen,a0
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move.l #BACKGROUND_COLOR,d0
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move.w #FONT_HEIGHT,d1
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move.l ypos,d2
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jsr BlitFillColor
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move.l offscreen,a0
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move.l ypos2,d2
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jsr BlitFillColor
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move.l offscreen,a0
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move.l ypos3,d2
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jsr BlitFillColor
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move.l direction,d0
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add.l d0,xpos
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move.l xpos,d0
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move.l ypos,d1 ; ypos
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move.l offscreen,a0
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lea text,a1
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jsr DrawText8
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move.l ypos2,d1
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jsr DrawText8
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move.l ypos3,d1
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jsr DrawText8
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jsr SwitchBuffers
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cmp.l #(BITPLANE_WIDTH)-1-((endText-text)*FONT_WIDTH),xpos
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ble .notRightEdge
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move.l direction,d0
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muls.w #-1,d0
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move.l d0,direction
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bra .notLeftEdge
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.notRightEdge:
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cmp.l #0,xpos
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bne .notLeftEdge
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move.l direction,d0
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muls.w #-1,d0
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move.l d0,direction
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.notLeftEdge:
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jsr GreyPalette
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bra MainLoop
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text:
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dc.b "My first text on an Amiga!"
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endText:
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dc.b 0
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align 4
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xpos:
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dc.l 0
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ypos:
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dc.l 1
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ypos2:
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dc.l SCREEN_HEIGHT-FONT_HEIGHT-1
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ypos3:
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dc.l (SCREEN_HEIGHT-FONT_HEIGHT-1)/2
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direction:
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dc.l 2
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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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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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InstallPalette:
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include "out/font8x8-palette.s"
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rts
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GreyPalette:
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include "out/font8x8-grey.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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section .bss
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bitplanes1:
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ds.b IMAGESIZE+(512)
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bitplanes2:
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ds.b IMAGESIZE+(512*2)
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startUserstack:
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ds.b $1000 ; size of stack
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userstack:
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