278 lines
5.0 KiB
ArmAsm
278 lines
5.0 KiB
ArmAsm
XDEF _takeOverSystem
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XDEF _giveBackSystem
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XDEF _initializeCopperlist
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XDEF _setUpDisplay
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XDEF _addDisplayToCopperlist
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XDEF _addColorsToCopperlist
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XDEF _endCopperlist
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XDEF _myWaitBlit
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XDEF _WaitBOF
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XREF _custom
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FUNC_CNT SET -30
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FUNCDEF MACRO
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_LVO\1 EQU FUNC_CNT
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FUNC_CNT SET FUNC_CNT-6
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ENDM
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INCDIR "include_i_39:"
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INCDIR "extra_lvos_39:"
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INCLUDE "exec/exec_lib.i"
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INCLUDE "exec/types.i"
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INCLUDE "exec/libraries.i" # get the CALLLIB macro
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INCLUDE "graphics/gfxbase.i"
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INCLUDE "graphics_lvo.i"
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INCLUDE "hardware/custom.i"
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INCLUDE "hardware/dmabits.i"
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; @param 1 Pointer to null terminated name of library
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; @param 2 Minimum version of library, 0 for any
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; @outreg D0 pointer to library in memory
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OpenLibrary MACRO
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MOVE.L 4,A6
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MOVEM.L A1,-(SP)
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MOVE.L \1,A1
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MOVE.L \2,D0
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CALLLIB _LVOOpenLibrary
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MOVEM.L (SP)+,A1
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ENDM
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PreserveRegister MACRO
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MOVE.L D0,-(SP)
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LEA _custom,A0
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MOVE.W \1r(A0),D0
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OR.W #$8000,D0
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MOVE.W D0,Old\1
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MOVE.L (SP)+,D0
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ENDM
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RestoreRegister MACRO
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MOVE.W #$7FFF,\1(A0)
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MOVE.W Old\1,\1(A0)
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ENDM
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STRUCTURE ScreenSetup,0
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UWORD ScreenSetup_width
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UWORD ScreenSetup_height
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UWORD ScreenSetup_bitplanes
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ULONG ScreenSetup_memoryStart
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LABEL ScreenSetup_SIZEOF
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BPLCON0_COLOR EQU $200
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_takeOverSystem:
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MOVE.L A6,-(SP)
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OpenLibrary #GraphicsLibrary,#0
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MOVE.L D0,GraphicsBase
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MOVE.L D0,A6
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MOVE.L gb_ActiView(A6),OldView
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MOVE.L gb_copinit(A6),OldCopper
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LEA _custom,A0
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PreserveRegister dmacon
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PreserveRegister intena
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PreserveRegister intreq
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PreserveRegister adkcon
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; http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node0036.html
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MOVE.W #$C000,intena(A0) ; enable master interrupt
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MOVE.W #$3FFF,intena(A0) ; disable every other interrupt
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MOVE.W #DMAF_SETCLR|DMAF_COPPER|DMAF_RASTER|DMAF_BLITTER,dmacon(A0)
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MOVE.W #DMAF_AUDIO|DMAF_DISK|DMAF_SPRITE,dmacon(A0)
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MOVE.L #0,A1
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CALLLIB _LVOLoadView
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CALLLIB _LVOWaitTOF
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CALLLIB _LVOWaitTOF
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CALLLIB _LVOOwnBlitter
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CALLLIB _LVOWaitBlit
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MOVE.L $4,A6
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CALLLIB _LVOForbid
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MOVE.L (SP)+,A6
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RTS
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_giveBackSystem:
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MOVE.L A6,-(SP)
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LEA _custom,A0
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RestoreRegister dmacon
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RestoreRegister intena
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RestoreRegister intreq
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RestoreRegister adkcon
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MOVE.L OldCopper,cop1lc(A0)
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MOVE.L GraphicsBase,A6
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MOVE.L OldView,A1
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CALLLIB _LVOLoadView
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CALLLIB _LVOWaitTOF
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CALLLIB _LVOWaitTOF
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CALLLIB _LVOWaitBlit
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CALLLIB _LVODisownBlitter
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MOVE.L $4,A6
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CALLLIB _LVOPermit
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MOVE.L (SP)+,A6
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RTS
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; @stack *copperlist Pointer to copperlist
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_initializeCopperlist:
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MOVE.L 4(A7),A0
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MOVE.L #$FFFFFFFE,(A0)
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RTS
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; @stack *copperlist Pointer to copperlist
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; @stack ScreenSetup Pointer to screensetup struct
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_addDisplayToCopperlist:
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MOVE.L 4(A7),A0 ; copperlist
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MOVE.L 8(A7),A1 ; struct
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; A2,D2,D3
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MOVEM.L A2/D2/D3,-(SP)
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MOVE.W ScreenSetup_bitplanes(A1),D0
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MOVE.L ScreenSetup_memoryStart(A1),A2
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; get bitplane offset
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MOVEQ #0,D2
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MOVE.W ScreenSetup_width(A1),D2
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ROR.W #3,D2
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MULU ScreenSetup_height(A1),D2
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SUBQ #1,D0
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.continue:
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; set up bplpt
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MOVEQ #0,D1
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MOVE.L D0,D1
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ROL.L #2,D1
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ADD.W #bplpt,D1
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; set up bitplane pointer
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MOVE.L D0,D3
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MULU D2,D3
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ADD.L A2,D3
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; high byte
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SWAP D3
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MOVE.W D1,(A0)+
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MOVE.W D3,(A0)+
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; low byte
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SWAP D3
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ADDQ #2,D1
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MOVE.W D1,(A0)+
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MOVE.W D3,(A0)+
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DBRA D0,.continue
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; current copperlist position
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MOVE.L A0,D0
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MOVEM.L (SP)+,A2/D2/D3
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RTS
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; @stack *copperlist
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; @stack *colors
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; @stack count
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_addColorsToCopperlist:
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MOVE.L 4(A7),A0 ; copperlist
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MOVE.L 8(A7),A1 ; colors
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MOVE.L 12(A7),D0 ; count
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MOVEM.L A2/D2,-(SP)
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LEA _custom,A2
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MOVE.L #color,D2
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ADD.L D2,A2
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SUBQ #1,D0
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.continue:
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MOVE.W (A1)+,(A2)+
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DBRA D0,.continue
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MOVE.L A2,D0
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MOVEM.L (SP)+,A2/D2
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RTS
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; @stack *copperlist
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_endCopperlist:
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MOVE.L 4(A7),A0
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MOVE.W #$ffff,(A0)+
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MOVE.W #$fffe,(A0)+
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MOVE.L A0,D0
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RTS
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; @stack bitplaneCount
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_setUpDisplay:
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MOVE.L D2,-(SP)
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MOVE.L 4(A7),D2
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LEA _custom,A1
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MOVEQ #0,D0
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MOVE.W #BPLCON0_COLOR,D0
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MOVEQ #0,D1
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MOVE.W D2,D1
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AND.W #$7,D1
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ROL.W #8,D1
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ROL.W #4,D1
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ADD.W D1,D0
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MOVE.W D0,bplcon0(A1)
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MOVE.W #0,bplcon1(A1)
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MOVE.W #0,bpl1mod(A1)
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MOVE.W #$2c21,diwstrt(A1)
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MOVE.W #$2cc1,diwstop(A1)
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MOVE.W #$0038,ddfstrt(A1)
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MOVE.W #$00d0,ddfstop(A1)
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MOVE.L (SP)+,D2
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RTS
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_myWaitBlit:
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LEA _custom,A0
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BTST.B #DMAB_BLTDONE-8,dmaconr(A0)
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BTST.B #DMAB_BLTDONE-8,dmaconr(A0)
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BEQ .done
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.loop:
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BTST.B #DMAB_BLTDONE-8,dmaconr(A0)
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BNE .loop
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.done:
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RTS
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_WaitBOF:
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MOVE.W 6(A7),D1
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ROL.W #8,D1
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MOVE.L $dff004,D0
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AND.L #$1ff00,D0
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CMP.L D1,D0
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BNE.B _WaitBOF
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.loop2:
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MOVE.L $dff004,D0
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AND.L #$1ff00,D0
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CMP.L D1,D0
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BEQ.B .loop2
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RTS
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CNOP 0,4
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OldView dc.l 0
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OldCopper dc.l 0
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GraphicsBase dc.l 0
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Olddmacon dc.w 0
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Oldintena dc.w 0
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Oldintreq dc.w 0
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Oldadkcon dc.w 0
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CNOP 0,4
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GraphicsLibrary GRAPHICSNAME
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