9293a45368
This is `#if 0` anyway, and has been since the initial Quake 3 Arena GPL release, so clearly it hasn't been used for some time. Signed-off-by: Simon McVittie <smcv@debian.org>
107 lines
2.4 KiB
ArmAsm
107 lines
2.4 KiB
ArmAsm
/*
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===========================================================================
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Copyright (C) 1999-2005 Id Software, Inc.
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This file is part of Quake III Arena source code.
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Quake III Arena source code is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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Quake III Arena source code is distributed in the hope that it will be
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useful, 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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You should have received a copy of the GNU General Public License
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along with Quake III Arena source code; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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===========================================================================
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*/
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//
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// snd_mixa.s
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// x86 assembly-language sound code
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//
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#include "qasm.h"
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#if id386
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.text
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//----------------------------------------------------------------------
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// Transfer of stereo buffer to 16-bit DMA buffer code
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//----------------------------------------------------------------------
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.globl C(S_WriteLinearBlastStereo16)
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C(S_WriteLinearBlastStereo16):
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pushl %edi
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pushl %ebx
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// int i;
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// int val;
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movl C(snd_linear_count),%ecx
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movl C(snd_p),%ebx
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movl C(snd_out),%edi
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// for (i=0 ; i<snd_linear_count ; i+=2)
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// {
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LWLBLoopTop:
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// val = (snd_p[i]*snd_vol)>>8;
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// if (val > 0x7fff)
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// snd_out[i] = 0x7fff;
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// else if (val < (short)0x8000)
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// snd_out[i] = (short)0x8000;
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// else
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// snd_out[i] = val;
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movl -8(%ebx,%ecx,4),%eax
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sarl $8,%eax
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cmpl $0x7FFF,%eax
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jg LClampHigh
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cmpl $0xFFFF8000,%eax
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jnl LClampDone
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movl $0xFFFF8000,%eax
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jmp LClampDone
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LClampHigh:
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movl $0x7FFF,%eax
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LClampDone:
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// val = (snd_p[i+1]*snd_vol)>>8;
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// if (val > 0x7fff)
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// snd_out[i+1] = 0x7fff;
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// else if (val < (short)0x8000)
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// snd_out[i+1] = (short)0x8000;
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// else
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// snd_out[i+1] = val;
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movl -4(%ebx,%ecx,4),%edx
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sarl $8,%edx
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cmpl $0x7FFF,%edx
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jg LClampHigh2
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cmpl $0xFFFF8000,%edx
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jnl LClampDone2
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movl $0xFFFF8000,%edx
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jmp LClampDone2
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LClampHigh2:
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movl $0x7FFF,%edx
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LClampDone2:
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shll $16,%edx
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andl $0xFFFF,%eax
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orl %eax,%edx
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movl %edx,-4(%edi,%ecx,2)
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// }
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subl $2,%ecx
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jnz LWLBLoopTop
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// snd_p += snd_linear_count;
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popl %ebx
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popl %edi
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ret
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#endif // id386
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