2021-05-12 02:26:00 +02:00
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; Line drawing procedure by Pablo Reda.
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; Gouraud extension by Maciej Guba.
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;****************************************************
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line_grd: ; eax=x1 ebx=y1 ecx=x2 edx=y2
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; xmm0 - color1 argb as 4 dword float
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; xmm1 - color2 argb as 4 dword float
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; xmm2 - z1 as dword float
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; xmm3 - z2 as dword float
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; mm0 - Z buffer
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; mm1 - screen buffer
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; mm2 - screen width
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cmp ebx,edx
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; je horizontal_grd
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jg .noswap
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xchg eax,ecx
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xchg ebx,edx
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movaps xmm7,xmm0
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movaps xmm0,xmm1
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movaps xmm1,xmm7
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movaps xmm7,xmm2
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movaps xmm2,xmm3
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movaps xmm3,xmm7
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.noswap:
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cvtsi2ss xmm7,eax
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cvtsi2ss xmm6,ebx
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cvtsi2ss xmm5,ecx
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cvtsi2ss xmm4,edx
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subss xmm7,xmm5
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subss xmm6,xmm4
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andps xmm7,[abs_mask] ; 0x7fff
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andps xmm6,[abs_mask] ; 0x7fff
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maxss xmm7,xmm6 ; xmm7 - delta
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shufps xmm7,xmm7,0
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movaps xmm6,xmm3
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rcpps xmm7,xmm7
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subss xmm6,xmm2
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mulss xmm6,xmm7 ; xmm6 - delta z
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movaps xmm5,xmm1
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subps xmm5,xmm0
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mulps xmm5,xmm7 ; xmm5 - delta col argb
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shl eax,16
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shl ecx,16
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sub eax,ecx
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push ebx
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push edx
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sub ebx,edx
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add ebx,1
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cdq
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idiv ebx
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mov esi,eax
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add ecx,$7fff
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pop ebx
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pop edx
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.lineas:
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mov eax,ecx
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add eax,esi
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push ebx
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push eax
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push edx
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shr ecx,16
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shr eax,16
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call horizontal_grd
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pop edx
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pop ecx
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pop ebx
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add ebx,1
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cmp ebx,edx
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jle .lineas
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ret
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horizontal_grd: ; eax=x1 ebx=y1 ecx=x2
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cmp ecx,eax
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jg .m
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xchg ecx,eax
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.m:
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sub ecx,eax
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jnz .nn
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add ecx,1
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.nn:
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movd edx,mm2
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imul ebx,edx
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add eax,ebx
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movd edi,mm1
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lea edi,[edi+eax*4]
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push eax
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push ebx
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movd ebx,mm0
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lea ebx,[ebx+eax*4]
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.l:
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; movss xmm4,xmm2 ; xmm2 - cur z
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; cmpnltss xmm4,[ebx]
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; movd eax,xmm4
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; or eax,eax
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; jnz @f
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comiss xmm2,[ebx]
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jng @f
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movaps xmm4,xmm0 ; xmm0 - cur col
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cvtps2dq xmm4,xmm4
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packssdw xmm4,xmm4
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packuswb xmm4,xmm4
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movd [edi],xmm4
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@@:
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addss xmm2,xmm6
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addps xmm0,xmm5
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add edi,4
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sub ecx,1
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jnz .l
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pop ebx
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pop eax
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ret
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