mirror of
https://frontier.innolan.net/github/AmigaExamples.git
synced 2026-09-12 06:52:21 +00:00
142 lines
3.4 KiB
ArmAsm
142 lines
3.4 KiB
ArmAsm
include "../include/registers.i"
|
|
include "hardware/dmabits.i"
|
|
include "hardware/intbits.i"
|
|
|
|
LVL3_INT_VECTOR equ $6c
|
|
SCREEN_WIDTH equ 320
|
|
SCREEN_HEIGHT equ 256
|
|
SCREEN_WIDTH_BYTES equ (SCREEN_WIDTH/8)
|
|
SCREEN_BIT_DEPTH equ 5
|
|
SCREEN_RES equ 8 ; 8=lo resolution, 4=hi resolution
|
|
RASTER_X_START equ $81 ; hard coded coordinates from hardware manual
|
|
RASTER_Y_START equ $2c
|
|
RASTER_X_STOP equ RASTER_X_START+SCREEN_WIDTH
|
|
RASTER_Y_STOP equ RASTER_Y_START+SCREEN_HEIGHT
|
|
|
|
public _bitblit
|
|
|
|
entry:
|
|
;; custom chip base globally in a6
|
|
lea CUSTOM,a6
|
|
|
|
move #$7ff,DMACON(a6) ; disable all dma
|
|
move #$7fff,INTENA(a6) ; disable all interrupts
|
|
|
|
;; bsr.s resetBitplanePointers
|
|
;; reset color registers to white
|
|
move.l #32,d0
|
|
lea COLOR00(a6),a0
|
|
.loop:
|
|
move.w #$FFF,(a0)
|
|
addq #2,a0
|
|
dbra d0,.loop
|
|
|
|
;; set up playfield
|
|
move.w #(RASTER_Y_START<<8)|RASTER_X_START,DIWSTRT(a6)
|
|
move.w #((RASTER_Y_STOP-256)<<8)|(RASTER_X_STOP-256),DIWSTOP(a6)
|
|
|
|
move.w #(RASTER_X_START/2-SCREEN_RES),DDFSTRT(a6)
|
|
move.w #(RASTER_X_START/2-SCREEN_RES)+(8*((SCREEN_WIDTH/16)-1)),DDFSTOP(a6)
|
|
|
|
move.w #(SCREEN_BIT_DEPTH<<12)|$200,BPLCON0(a6)
|
|
move.w #SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH-SCREEN_WIDTH_BYTES,BPL1MOD(a6)
|
|
move.w #SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH-SCREEN_WIDTH_BYTES,BPL2MOD(a6)
|
|
|
|
;; poke bitplane pointers
|
|
lea bitplanes(pc),a1
|
|
lea copper(pc),a2
|
|
moveq #SCREEN_BIT_DEPTH-1,d0
|
|
.bitplaneloop:
|
|
move.l a1,d1
|
|
move.w d1,2(a2)
|
|
swap d1
|
|
move.w d1,6(a2)
|
|
lea SCREEN_WIDTH_BYTES(a1),a1 ; bit plane data is interleaved
|
|
addq #8,a2
|
|
dbra d0,.bitplaneloop
|
|
|
|
;; install copper list, then enable dma and selected interrupts
|
|
lea copper(pc),a0
|
|
move.l a0,COP1LC(a6)
|
|
move.w COPJMP1(a6),d0
|
|
move.w #(DMAF_BLITTER|DMAF_SETCLR!DMAF_COPPER!DMAF_RASTER!DMAF_MASTER),DMACON(a6)
|
|
move.w #(INTF_SETCLR|INTF_INTEN|INTF_EXTER),INTENA(a6)
|
|
|
|
bsr.s doblit
|
|
|
|
.mainLoop:
|
|
move.w #$02a,d0 ;wait for EOFrame
|
|
bsr.s waitRaster
|
|
bra.s .mainLoop
|
|
|
|
if 0
|
|
resetBitplanePointers:
|
|
movem.l d0-a6,-(sp)
|
|
lea bitplanes,a1
|
|
lea BPL1PTH(a6),a2
|
|
moveq #SCREEN_BIT_DEPTH,d0
|
|
.bitplaneloop:
|
|
move.l a1,(a2)
|
|
lea SCREEN_WIDTH_BYTES(a1),a1 ; bit plane data is interleaved
|
|
addq #4,a2
|
|
dbra d0,.bitplaneloop
|
|
movem.l (sp)+,d0-a6
|
|
rts
|
|
endif
|
|
|
|
waitRaster: ;wait for rasterline d0.w. Modifies d0-d2/a0.
|
|
move.l #$1ff00,d2
|
|
lsl.l #8,d0
|
|
and.l d2,d0
|
|
lea $dff004,a0
|
|
.wr: move.l (a0),d1
|
|
and.l d2,d1
|
|
cmp.l d1,d0
|
|
bne.s .wr
|
|
rts
|
|
|
|
blitWait:
|
|
tst DMACONR(a6) ;for compatibility
|
|
.waitblit:
|
|
btst #6,DMACONR(a6)
|
|
bne.s .waitblit
|
|
rts
|
|
|
|
doblit:
|
|
movem.l d0-a6,-(sp)
|
|
lea $dff000,a6
|
|
bsr blitWait
|
|
move.l #$09f00000,BLTCON0(a6) ;A->D copy, no shifts, ascending mode
|
|
move.l #$ffffffff,BLTAFWM(a6) ;no masking of first/last word
|
|
move.w #0,BLTAMOD(a6) ;A modulo=bytes to skip between lines
|
|
move.w #0,BLTDMOD(a6) ;D modulo
|
|
move.l #bitplanes,BLTAPTH(a6) ;source graphic top left corner
|
|
move.l #bitplanes+(SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH*SCREEN_HEIGHT/2),BLTDPTH(a6) ;destination top left corner
|
|
move.w #SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH*SCREEN_HEIGHT/4,BLTSIZE(a6) ;rectangle size, starts blit
|
|
movem.l (sp)+,d0-a6
|
|
rts
|
|
|
|
include "out/bitblit.s"
|
|
copper:
|
|
;; bitplane pointers must be first else poking addresses will be incorrect
|
|
dc.w BPL1PTL,0
|
|
dc.w BPL1PTH,0
|
|
dc.w BPL2PTL,0
|
|
dc.w BPL2PTH,0
|
|
dc.w BPL3PTL,0
|
|
dc.w BPL3PTH,0
|
|
dc.w BPL4PTL,0
|
|
dc.w BPL4PTH,0
|
|
dc.w BPL5PTL,0
|
|
dc.w BPL5PTH,0
|
|
|
|
include "out/image-copper-list.s"
|
|
|
|
dc.l $fffffffe
|
|
bitplanes:
|
|
incbin "out/image.bin"
|
|
|
|
tc:
|
|
incbin "out/tc.bin"
|
|
tcMask:
|
|
incbin "out/tc-mask.bin" |