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Diffstat (limited to 'code/asm/snd_mixa.s')
| -rw-r--r-- | code/asm/snd_mixa.s | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/code/asm/snd_mixa.s b/code/asm/snd_mixa.s new file mode 100644 index 0000000..4c6be5b --- /dev/null +++ b/code/asm/snd_mixa.s @@ -0,0 +1,217 @@ +/* +=========================================================================== +Copyright (C) 1999-2005 Id Software, Inc. + +This file is part of Quake III Arena source code. + +Quake III Arena source code is free software; you can redistribute it +and/or modify it under the terms of the GNU General Public License as +published by the Free Software Foundation; either version 2 of the License, +or (at your option) any later version. + +Quake III Arena source code is distributed in the hope that it will be +useful, but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with Foobar; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA +=========================================================================== +*/ +// +// snd_mixa.s +// x86 assembly-language sound code +// + +#include "qasm.h" + +#if id386 + + .text + +#if 0 +//---------------------------------------------------------------------- +// 8-bit sound-mixing code +//---------------------------------------------------------------------- + +#define ch 4+16 +#define sc 8+16 +#define count 12+16 + +.globl C(S_PaintChannelFrom8) +C(S_PaintChannelFrom8): + pushl %esi // preserve register variables + pushl %edi + pushl %ebx + pushl %ebp + +// int data; +// short *lscale, *rscale; +// unsigned char *sfx; +// int i; + + movl ch(%esp),%ebx + movl sc(%esp),%esi + +// if (ch->leftvol > 255) +// ch->leftvol = 255; +// if (ch->rightvol > 255) +// ch->rightvol = 255; + movl ch_leftvol(%ebx),%eax + movl ch_rightvol(%ebx),%edx + cmpl $255,%eax + jna LLeftSet + movl $255,%eax +LLeftSet: + cmpl $255,%edx + jna LRightSet + movl $255,%edx +LRightSet: + +// lscale = snd_scaletable[ch->leftvol >> 3]; +// rscale = snd_scaletable[ch->rightvol >> 3]; +// sfx = (signed char *)sc->data + ch->pos; +// ch->pos += count; + andl $0xF8,%eax + addl $20,%esi + movl (%esi),%esi + andl $0xF8,%edx + movl ch_pos(%ebx),%edi + movl count(%esp),%ecx + addl %edi,%esi + shll $7,%eax + addl %ecx,%edi + shll $7,%edx + movl %edi,ch_pos(%ebx) + addl $(C(snd_scaletable)),%eax + addl $(C(snd_scaletable)),%edx + subl %ebx,%ebx + movb -1(%esi,%ecx,1),%bl + + testl $1,%ecx + jz LMix8Loop + + movl (%eax,%ebx,4),%edi + movl (%edx,%ebx,4),%ebp + addl C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi + addl C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp + movl %edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size) + movl %ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size) + movb -2(%esi,%ecx,1),%bl + + decl %ecx + jz LDone + +// for (i=0 ; i<count ; i++) +// { +LMix8Loop: + +// data = sfx[i]; +// paintbuffer[i].left += lscale[data]; +// paintbuffer[i].right += rscale[data]; + movl (%eax,%ebx,4),%edi + movl (%edx,%ebx,4),%ebp + addl C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi + addl C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp + movb -2(%esi,%ecx,1),%bl + movl %edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size) + movl %ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size) + + movl (%eax,%ebx,4),%edi + movl (%edx,%ebx,4),%ebp + movb -3(%esi,%ecx,1),%bl + addl C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size),%edi + addl C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size),%ebp + movl %edi,C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size) + movl %ebp,C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size) + +// } + subl $2,%ecx + jnz LMix8Loop + +LDone: + popl %ebp + popl %ebx + popl %edi + popl %esi + + ret + + +#endif + +//---------------------------------------------------------------------- +// Transfer of stereo buffer to 16-bit DMA buffer code +//---------------------------------------------------------------------- + +.globl C(S_WriteLinearBlastStereo16) +C(S_WriteLinearBlastStereo16): + pushl %edi + pushl %ebx + +// int i; +// int val; + movl C(snd_linear_count),%ecx + movl C(snd_p),%ebx + movl C(snd_out),%edi + +// for (i=0 ; i<snd_linear_count ; i+=2) +// { +LWLBLoopTop: + +// val = (snd_p[i]*snd_vol)>>8; +// if (val > 0x7fff) +// snd_out[i] = 0x7fff; +// else if (val < (short)0x8000) +// snd_out[i] = (short)0x8000; +// else +// snd_out[i] = val; + movl -8(%ebx,%ecx,4),%eax + sarl $8,%eax + cmpl $0x7FFF,%eax + jg LClampHigh + cmpl $0xFFFF8000,%eax + jnl LClampDone + movl $0xFFFF8000,%eax + jmp LClampDone +LClampHigh: + movl $0x7FFF,%eax +LClampDone: + +// val = (snd_p[i+1]*snd_vol)>>8; +// if (val > 0x7fff) +// snd_out[i+1] = 0x7fff; +// else if (val < (short)0x8000) +// snd_out[i+1] = (short)0x8000; +// else +// snd_out[i+1] = val; + movl -4(%ebx,%ecx,4),%edx + sarl $8,%edx + cmpl $0x7FFF,%edx + jg LClampHigh2 + cmpl $0xFFFF8000,%edx + jnl LClampDone2 + movl $0xFFFF8000,%edx + jmp LClampDone2 +LClampHigh2: + movl $0x7FFF,%edx +LClampDone2: + shll $16,%edx + andl $0xFFFF,%eax + orl %eax,%edx + movl %edx,-4(%edi,%ecx,2) + +// } + subl $2,%ecx + jnz LWLBLoopTop + +// snd_p += snd_linear_count; + + popl %ebx + popl %edi + + ret + +#endif // id386 + |