mirror of
https://github.com/blendogames/thirtyflightsofloving.git
synced 2024-11-14 16:40:57 +00:00
193 lines
3.9 KiB
ArmAsm
193 lines
3.9 KiB
ArmAsm
//
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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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// 8-bit sound-mixing code
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//----------------------------------------------------------------------
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#define ch 4+16
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#define sc 8+16
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#define count 12+16
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.globl C(S_PaintChannelFrom8)
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C(S_PaintChannelFrom8):
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pushl %esi // preserve register variables
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pushl %edi
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pushl %ebx
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pushl %ebp
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// int data;
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// short *lscale, *rscale;
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// unsigned char *sfx;
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// int i;
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movl ch(%esp),%ebx
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movl sc(%esp),%esi
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// if (ch->leftvol > 255)
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// ch->leftvol = 255;
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// if (ch->rightvol > 255)
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// ch->rightvol = 255;
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movl ch_leftvol(%ebx),%eax
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movl ch_rightvol(%ebx),%edx
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cmpl $255,%eax
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jna LLeftSet
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movl $255,%eax
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LLeftSet:
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cmpl $255,%edx
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jna LRightSet
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movl $255,%edx
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LRightSet:
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// lscale = snd_scaletable[ch->leftvol >> 3];
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// rscale = snd_scaletable[ch->rightvol >> 3];
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// sfx = (signed char *)sc->data + ch->pos;
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// ch->pos += count;
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andl $0xF8,%eax
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addl $(sfxc_data),%esi
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andl $0xF8,%edx
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movl ch_pos(%ebx),%edi
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movl count(%esp),%ecx
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addl %edi,%esi
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shll $7,%eax
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addl %ecx,%edi
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shll $7,%edx
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movl %edi,ch_pos(%ebx)
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addl $(C(snd_scaletable)),%eax
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addl $(C(snd_scaletable)),%edx
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subl %ebx,%ebx
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movb -1(%esi,%ecx,1),%bl
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testl $1,%ecx
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jz LMix8Loop
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movl (%eax,%ebx,4),%edi
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movl (%edx,%ebx,4),%ebp
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addl C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi
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addl C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp
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movl %edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size)
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movl %ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size)
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movb -2(%esi,%ecx,1),%bl
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decl %ecx
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jz LDone
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// for (i=0 ; i<count ; i++)
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// {
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LMix8Loop:
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// data = sfx[i];
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// paintbuffer[i].left += lscale[data];
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// paintbuffer[i].right += rscale[data];
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movl (%eax,%ebx,4),%edi
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movl (%edx,%ebx,4),%ebp
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addl C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi
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addl C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp
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movb -2(%esi,%ecx,1),%bl
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movl %edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size)
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movl %ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size)
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movl (%eax,%ebx,4),%edi
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movl (%edx,%ebx,4),%ebp
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movb -3(%esi,%ecx,1),%bl
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addl C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size),%edi
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addl C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size),%ebp
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movl %edi,C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size)
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movl %ebp,C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size)
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// }
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subl $2,%ecx
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jnz LMix8Loop
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LDone:
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popl %ebp
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popl %ebx
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popl %edi
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popl %esi
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ret
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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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