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Rev Author Line No. Line
8719 leency 1 
; 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