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55 lines
1.1 KiB
ArmAsm
55 lines
1.1 KiB
ArmAsm
include "includes.i"
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xdef DisplayBitplane
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LoadImage:
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;; d0 - size
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;; a1 - start address
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;; a2 - InstallColorPalette(X) address
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lea bitplanes3,a0
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bsr LoadDiskData ; load data from disk
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;; move.l nextbitplane,a1 ; decompress into offscreen bitplanesp(1/2)
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;; a0 = Input buffer to be decompressed. Must be 16-bit aligned!
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;; a1 = Output buffer. Points to the end of the data at exit
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jsr Depack
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jsr WaitVerticalBlank ; avoid tearing when we show the new image
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jsr (a2) ; install new color palette
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jsr DisplayBitplane ; display new image
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rts
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DisplayBitplane:
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;; a0 - bitplane address
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movem.l d0/a0-a1,-(sp)
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moveq.l #0,d0
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move.l a0,a1
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lea copperListBplPtr,a0
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jsr PokeBitplanePointers
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movem.l (sp)+,d0/a0-a1
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rts
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PokeBitplanePointers:
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; d0 = frame offset in bytes
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; a0 = BPLP copper list address
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; a1 = bitplanes pointer
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movem.l d0-a6,-(sp)
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add.l d0,a1 ; Offset for odd/even frames
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moveq #SCREEN_BIT_DEPTH-1,d0
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.bitplaneloop:
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move.l a1,d1
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move.w d1,2(a0)
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swap d1
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move.w d1,6(a0)
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lea SCREEN_WIDTH_BYTES(a1),a1
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addq #8,a0
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dbra d0,.bitplaneloop
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movem.l (sp)+,d0-a6
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rts
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