mirror of
https://git.code.sf.net/p/quake/quake2forge
synced 2024-12-12 13:42:21 +00:00
193 lines
3.9 KiB
ArmAsm
193 lines
3.9 KiB
ArmAsm
//
|
|
// snd_mixa.s
|
|
// x86 assembly-language sound code
|
|
//
|
|
|
|
#include "qasm.h"
|
|
|
|
#if id386
|
|
|
|
.text
|
|
|
|
//----------------------------------------------------------------------
|
|
// 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 $(sfxc_data),%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
|
|
|
|
|
|
//----------------------------------------------------------------------
|
|
// 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
|
|
|