2014-03-15 16:59:03 +00:00
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// SONIC ROBO BLAST 2
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//-----------------------------------------------------------------------------
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// Copyright (C) 1998-2000 by DooM Legacy Team.
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2016-07-06 04:09:17 +00:00
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// Copyright (C) 1999-2016 by Sonic Team Junior.
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2014-03-15 16:59:03 +00:00
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file vid_copy.s
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/// \brief code for updating the linear frame buffer screen.
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#include "asm_defs.inc" // structures, must match the C structures!
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// DJGPPv2 is as fast as this one, but then someone may compile with a less
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// good version of DJGPP than mine, so this little asm will do the trick!
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#define srcptr 4+16
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#define destptr 8+16
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#define width 12+16
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#define height 16+16
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#define srcrowbytes 20+16
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#define destrowbytes 24+16
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// VID_BlitLinearScreen( src, dest, width, height, srcwidth, destwidth );
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// width is given as BYTES
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#ifdef __i386__
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.globl C(VID_BlitLinearScreen_ASM)
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C(VID_BlitLinearScreen_ASM):
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pushl %ebp // preserve caller's stack frame
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pushl %edi
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pushl %esi // preserve register variables
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pushl %ebx
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cld
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movl srcptr(%esp),%esi
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movl destptr(%esp),%edi
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movl width(%esp),%ebx
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movl srcrowbytes(%esp),%eax
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subl %ebx,%eax
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movl destrowbytes(%esp),%edx
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subl %ebx,%edx
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shrl $2,%ebx
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movl height(%esp),%ebp
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LLRowLoop:
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movl %ebx,%ecx
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rep/movsl (%esi),(%edi)
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addl %eax,%esi
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addl %edx,%edi
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decl %ebp
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jnz LLRowLoop
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popl %ebx // restore register variables
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popl %esi
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popl %edi
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popl %ebp // restore the caller's stack frame
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ret
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#endif
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