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1.1 ! root 1: // ! 2: // snd_mixa.s ! 3: // x86 assembly-language sound code ! 4: // ! 5: ! 6: #include "qasm.h" ! 7: ! 8: #if id386 ! 9: ! 10: .text ! 11: ! 12: //---------------------------------------------------------------------- ! 13: // 8-bit sound-mixing code ! 14: //---------------------------------------------------------------------- ! 15: ! 16: #define ch 4+16 ! 17: #define sc 8+16 ! 18: #define count 12+16 ! 19: ! 20: .globl C(S_PaintChannelFrom8) ! 21: C(S_PaintChannelFrom8): ! 22: pushl %esi // preserve register variables ! 23: pushl %edi ! 24: pushl %ebx ! 25: pushl %ebp ! 26: ! 27: // int data; ! 28: // short *lscale, *rscale; ! 29: // unsigned char *sfx; ! 30: // int i; ! 31: ! 32: movl ch(%esp),%ebx ! 33: movl sc(%esp),%esi ! 34: ! 35: // if (ch->leftvol > 255) ! 36: // ch->leftvol = 255; ! 37: // if (ch->rightvol > 255) ! 38: // ch->rightvol = 255; ! 39: movl ch_leftvol(%ebx),%eax ! 40: movl ch_rightvol(%ebx),%edx ! 41: cmpl $255,%eax ! 42: jna LLeftSet ! 43: movl $255,%eax ! 44: LLeftSet: ! 45: cmpl $255,%edx ! 46: jna LRightSet ! 47: movl $255,%edx ! 48: LRightSet: ! 49: ! 50: // lscale = snd_scaletable[ch->leftvol >> 3]; ! 51: // rscale = snd_scaletable[ch->rightvol >> 3]; ! 52: // sfx = (signed char *)sc->data + ch->pos; ! 53: // ch->pos += count; ! 54: andl $0xF8,%eax ! 55: addl $(sfxc_data),%esi ! 56: andl $0xF8,%edx ! 57: movl ch_pos(%ebx),%edi ! 58: movl count(%esp),%ecx ! 59: addl %edi,%esi ! 60: shll $7,%eax ! 61: addl %ecx,%edi ! 62: shll $7,%edx ! 63: movl %edi,ch_pos(%ebx) ! 64: addl $(C(snd_scaletable)),%eax ! 65: addl $(C(snd_scaletable)),%edx ! 66: subl %ebx,%ebx ! 67: movb -1(%esi,%ecx,1),%bl ! 68: ! 69: testl $1,%ecx ! 70: jz LMix8Loop ! 71: ! 72: movl (%eax,%ebx,4),%edi ! 73: movl (%edx,%ebx,4),%ebp ! 74: addl C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi ! 75: addl C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp ! 76: movl %edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size) ! 77: movl %ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size) ! 78: movb -2(%esi,%ecx,1),%bl ! 79: ! 80: decl %ecx ! 81: jz LDone ! 82: ! 83: // for (i=0 ; i<count ; i++) ! 84: // { ! 85: LMix8Loop: ! 86: ! 87: // data = sfx[i]; ! 88: // paintbuffer[i].left += lscale[data]; ! 89: // paintbuffer[i].right += rscale[data]; ! 90: movl (%eax,%ebx,4),%edi ! 91: movl (%edx,%ebx,4),%ebp ! 92: addl C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size),%edi ! 93: addl C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size),%ebp ! 94: movb -2(%esi,%ecx,1),%bl ! 95: movl %edi,C(paintbuffer)+psp_left-psp_size(,%ecx,psp_size) ! 96: movl %ebp,C(paintbuffer)+psp_right-psp_size(,%ecx,psp_size) ! 97: ! 98: movl (%eax,%ebx,4),%edi ! 99: movl (%edx,%ebx,4),%ebp ! 100: movb -3(%esi,%ecx,1),%bl ! 101: addl C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size),%edi ! 102: addl C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size),%ebp ! 103: movl %edi,C(paintbuffer)+psp_left-psp_size*2(,%ecx,psp_size) ! 104: movl %ebp,C(paintbuffer)+psp_right-psp_size*2(,%ecx,psp_size) ! 105: ! 106: // } ! 107: subl $2,%ecx ! 108: jnz LMix8Loop ! 109: ! 110: LDone: ! 111: popl %ebp ! 112: popl %ebx ! 113: popl %edi ! 114: popl %esi ! 115: ! 116: ret ! 117: ! 118: ! 119: //---------------------------------------------------------------------- ! 120: // Transfer of stereo buffer to 16-bit DMA buffer code ! 121: //---------------------------------------------------------------------- ! 122: ! 123: .globl C(S_WriteLinearBlastStereo16) ! 124: C(S_WriteLinearBlastStereo16): ! 125: pushl %edi ! 126: pushl %ebx ! 127: ! 128: // int i; ! 129: // int val; ! 130: movl C(snd_linear_count),%ecx ! 131: movl C(snd_p),%ebx ! 132: movl C(snd_out),%edi ! 133: ! 134: // for (i=0 ; i<snd_linear_count ; i+=2) ! 135: // { ! 136: LWLBLoopTop: ! 137: ! 138: // val = (snd_p[i]*snd_vol)>>8; ! 139: // if (val > 0x7fff) ! 140: // snd_out[i] = 0x7fff; ! 141: // else if (val < (short)0x8000) ! 142: // snd_out[i] = (short)0x8000; ! 143: // else ! 144: // snd_out[i] = val; ! 145: movl -8(%ebx,%ecx,4),%eax ! 146: sarl $8,%eax ! 147: cmpl $0x7FFF,%eax ! 148: jg LClampHigh ! 149: cmpl $0xFFFF8000,%eax ! 150: jnl LClampDone ! 151: movl $0xFFFF8000,%eax ! 152: jmp LClampDone ! 153: LClampHigh: ! 154: movl $0x7FFF,%eax ! 155: LClampDone: ! 156: ! 157: // val = (snd_p[i+1]*snd_vol)>>8; ! 158: // if (val > 0x7fff) ! 159: // snd_out[i+1] = 0x7fff; ! 160: // else if (val < (short)0x8000) ! 161: // snd_out[i+1] = (short)0x8000; ! 162: // else ! 163: // snd_out[i+1] = val; ! 164: movl -4(%ebx,%ecx,4),%edx ! 165: sarl $8,%edx ! 166: cmpl $0x7FFF,%edx ! 167: jg LClampHigh2 ! 168: cmpl $0xFFFF8000,%edx ! 169: jnl LClampDone2 ! 170: movl $0xFFFF8000,%edx ! 171: jmp LClampDone2 ! 172: LClampHigh2: ! 173: movl $0x7FFF,%edx ! 174: LClampDone2: ! 175: shll $16,%edx ! 176: andl $0xFFFF,%eax ! 177: orl %eax,%edx ! 178: movl %edx,-4(%edi,%ecx,2) ! 179: ! 180: // } ! 181: subl $2,%ecx ! 182: jnz LWLBLoopTop ! 183: ! 184: // snd_p += snd_linear_count; ! 185: ! 186: popl %ebx ! 187: popl %edi ! 188: ! 189: ret ! 190: ! 191: ! 192: #endif // id386 ! 193:
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