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https://github.com/Pecusx/libretro-atari800.git
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R-type
134 lines
2.5 KiB
NASM
134 lines
2.5 KiB
NASM
; atari_asm.asm - Amiga specific port code
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;
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; Copyright (c) 2000 Sebastian Bauer
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; Copyright (C) 2000-2003 Atari800 development team (see DOC/CREDITS)
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;
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; This file is part of the Atari800 emulator project which emulates
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; the Atari 400, 800, 800XL, 130XE, and 5200 8-bit computers.
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;
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; Atari800 is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; Atari800 is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with Atari800; if not, write to the Free Software
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; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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MC68020
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XDEF _ScreenData28bit
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; a0 - UBYTE *screen
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; a1 - UBYTE *destscreendata
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; a2 - UBYTE *colortable8
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; d0 - UWORD width
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; d1 - UWORD height
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_ScreenData28bit:
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movem.l d2/d7,-(a7)
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lsr.w #2,d0
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subq.l #1,d1
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subq.l #1,d0
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moveq #0,d2
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; moveq #0,d3
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; moveq #0,d4
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; moveq #0,d5
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.heightloop: move.l d0,d7
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.widthloop:
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; move.b (a0)+,d2
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; move.b (a0)+,d3
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; move.b (a0)+,d4
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; move.b (a0)+,d5
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; move.b (a2,d2),(a1)+
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; move.b (a2,d3),(a1)+
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; move.b (a2,d4),(a1)+
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; move.b (a2,d5),(a1)+
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move.b (a0)+,d2
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move.b (a2,d2),(a1)+
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move.b (a0)+,d2
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move.b (a2,d2),(a1)+
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move.b (a0)+,d2
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move.b (a2,d2),(a1)+
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move.b (a0)+,d2
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move.b (a2,d2),(a1)+
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; moveq #0,d3
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; moveq #0,d5
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; move.b (a0)+,d2
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; move.b (a2,d2),d3
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; move.b (a0)+,d2
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; lsl.w #8,d3
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; move.b (a2,d2),d4
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; move.b (a0)+,d2
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; or.w d4,d3
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; move.b (a2,d2),d5
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; swap d3
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; move.b (a0)+,d2
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; lsl.w #8,d5
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; move.b (a2,d2),d3
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; or.w d5,d3
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; move.l d3,(a1)+
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dbra d7,.widthloop
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dbra d1,.heightloop
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movem.l (a7)+,d2/d7
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rts
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XDEF _ScreenData215bit
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; a0 - UBYTE *screen
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; a1 - UWORD *destscreendata
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; a2 - UWORD *colortable15
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; d0 - UWORD width
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; d1 - UWORD height
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_ScreenData215bit:
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movem.l d2/d3/d7,-(a7)
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lsr.l #1,d0
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subq.l #1,d1
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subq.l #1,d0
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moveq #0,d2
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.heightloop: move.l d0,d7
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.widthloop:
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move.b (a0)+,d2
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move.w (a2,d2*2),d3
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move.b (a0)+,d2
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swap d3
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move.w (a2,d2*2),d3
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move.l d3,(a1)+
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dbra d7,.widthloop
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dbra d1,.heightloop
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movem.l (a7)+,d2/d3/d7
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rts
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end
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