2021-11-03 17:39:08 +01:00
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; Real Phong's shading implemented if flat assembler
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; by Maciej Guba.
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; http://macgub.co.pl
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ROUND2 equ 10
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real_phong_tri_z:
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;----procedure render Phongs shaded triangle with z coord
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;----interpolation ( Catmull alghoritm )-----------------
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;----I normalize normal vector in every pixel -----------
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;------------------in - eax - x1 shl 16 + y1 ------------
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;---------------------- ebx - x2 shl 16 + y2 ------------
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;---------------------- ecx - x3 shl 16 + y3 ------------
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;---------------------- esi - pointer to Z-buffer filled-
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;---------------------- with dd float variables--------
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;---------------------- edi - pointer to screen buffer---
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;---------------------- xmm0 - 1st normal vector --------
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;---------------------- xmm1 - 2cond normal vector ------
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;---------------------- xmm2 - 3rd normal vector --------
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;---------------------- xmm3 - normalized light vector --
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;---------------------- xmm4 - lo -> hi z1, z2, z3 coords
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;---------------------- as dwords floats ---------------
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;---------------------- xmm5 - lo -> hi y_min, y_max, ---
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;---------------------- x_min, x_max as dword integers -
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;---------------------- stack - no parameters -----------
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;--------------------------------------------------------
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;----------------- procedure don't save registers !! ----
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push ebp
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mov ebp,esp
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sub esp,512
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sub ebp,16
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and ebp,0xfffffff0
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.1_nv equ [ebp-16]
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.2_nv equ [ebp-32]
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.3_nv equ [ebp-48]
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.l_v equ [ebp-64]
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.z3 equ [ebp-72]
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.z2 equ [ebp-76]
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.z1 equ [ebp-80]
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.x1 equ [ebp-82]
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.y1 equ [ebp-84]
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.x2 equ [ebp-86]
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.y2 equ [ebp-88]
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.x3 equ [ebp-90]
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.y3 equ [ebp-92]
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.Zbuf equ [ebp-96]
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.x_max equ [ebp-100]
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.x_min equ [ebp-104]
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.y_max equ [ebp-108]
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.y_min equ [ebp-112]
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.screen equ [ebp-116]
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.dx12 equ [ebp-120]
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.dx13 equ [ebp-124]
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.dx23 equ [ebp-128]
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.dn12 equ [ebp-144]
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.dn13 equ [ebp-160]
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.dn23 equ [ebp-176]
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.dz12 equ [ebp-180]
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.dz13 equ [ebp-184]
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.dz23 equ [ebp-188]
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.cnv1 equ [ebp-208] ; cur normal vectors
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.cnv2 equ [ebp-224]
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.cz2 equ [ebp-228]
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.cz1 equ [ebp-232]
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.sort3: ; sort triangle coordinates...
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cmp ax,bx
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jle .sort1
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xchg eax,ebx
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shufps xmm4,xmm4,11100001b
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movaps xmm6,xmm0
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movaps xmm0,xmm1
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movaps xmm1,xmm6
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.sort1:
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cmp bx,cx
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jle .sort2
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xchg ebx,ecx
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shufps xmm4,xmm4,11011000b
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movaps xmm6,xmm1
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movaps xmm1,xmm2
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movaps xmm2,xmm6
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jmp .sort3
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.sort2:
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movaps .z1,xmm4
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mov .y1,eax
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mov .y2,ebx
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mov .y3,ecx
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movdqa .y_min,xmm5
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if 1 ; check if at last only fragment
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packssdw xmm5,xmm5 ; of triangle is in visable area
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pshuflw xmm5,xmm5,11011000b
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movdqu xmm7,.y3
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movdqa xmm6,xmm5
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pshufd xmm5,xmm5,0 ; xmm5 lo-hi -> broadcasted y_min, x_min
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pshufd xmm6,xmm6,01010101b ;xmm6 -> brd y_max x_max
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movdqa xmm4,xmm7
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pcmpgtw xmm7,xmm5
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pcmpgtw xmm4,xmm6
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pxor xmm7,xmm4
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pmovmskb eax,xmm7
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and eax,0x00aaaaaa
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or eax,eax
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jz .rpt_loop2_end
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end if
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movaps .1_nv,xmm0
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movaps .2_nv,xmm1
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movaps .3_nv,xmm2
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movaps .l_v,xmm3
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mov .Zbuf,esi
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mov .screen,edi
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mov bx,.y2 ; calc deltas
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sub bx,.y1
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jnz .rpt_dx12_make
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xorps xmm7,xmm7
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mov dword .dx12,0
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mov dword .dz12,0
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movaps .dn12,xmm7
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jmp .rpt_dx12_done
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.rpt_dx12_make:
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mov ax,.x2
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sub ax,.x1
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cwde
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movsx ebx,bx
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shl eax,ROUND2
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cdq
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idiv ebx
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mov .dx12,eax
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cvtsi2ss xmm6,ebx
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movss xmm5,.z2
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subss xmm5,.z1
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divss xmm5,xmm6
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movss .dz12,xmm5
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movaps xmm0,.2_nv
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subps xmm0,.1_nv
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shufps xmm6,xmm6,0
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divps xmm0,xmm6
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movaps .dn12,xmm0
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.rpt_dx12_done:
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mov bx,.y3 ; calc deltas
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sub bx,.y1
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jnz .rpt_dx13_make
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xorps xmm7,xmm7
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mov dword .dx13,0
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mov dword .dz13,0
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movaps .dn13,xmm7
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jmp .rpt_dx13_done
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.rpt_dx13_make:
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mov ax,.x3
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sub ax,.x1
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cwde
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movsx ebx,bx
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shl eax,ROUND2
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cdq
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idiv ebx
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mov .dx13,eax
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cvtsi2ss xmm6,ebx
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movss xmm5,.z3
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subss xmm5,.z1
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divss xmm5,xmm6
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movss .dz13,xmm5
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movaps xmm0,.3_nv
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subps xmm0,.1_nv
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shufps xmm6,xmm6,0
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divps xmm0,xmm6
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movaps .dn13,xmm0
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.rpt_dx13_done:
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mov bx,.y3 ; calc deltas
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sub bx,.y2
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jnz .rpt_dx23_make
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xorps xmm7,xmm7
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mov dword .dx23,0
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mov dword .dz23,0
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movaps .dn23,xmm7
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jmp .rpt_dx23_done
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.rpt_dx23_make:
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mov ax,.x3
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sub ax,.x2
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cwde
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movsx ebx,bx
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shl eax,ROUND2
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cdq
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idiv ebx
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mov .dx23,eax
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cvtsi2ss xmm6,ebx
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movss xmm5,.z3
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subss xmm5,.z2
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divss xmm5,xmm6
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movss .dz23,xmm5
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movaps xmm0,.3_nv
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subps xmm0,.2_nv
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shufps xmm6,xmm6,0
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divps xmm0,xmm6
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movaps .dn23,xmm0
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.rpt_dx23_done:
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movsx eax,word .x1
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shl eax,ROUND2
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mov ebx,eax
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mov edx,.z1
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mov .cz1,edx
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mov .cz2,edx
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movaps xmm0,.1_nv
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movaps .cnv1,xmm0
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movaps .cnv2,xmm0
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movsx ecx,word .y1
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cmp cx,.y2
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jge .rpt_loop1_end
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.rpt_loop1:
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pushad
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movaps xmm2,.y_min
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movaps xmm0,.cnv1
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movaps xmm1,.cnv2
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movlps xmm3,.cz1
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movaps xmm4,.l_v
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sar ebx,ROUND2
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sar eax,ROUND2
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mov edi,.screen
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mov esi,.Zbuf
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call real_phong_line_z
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popad
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movaps xmm0,.cnv1
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movaps xmm1,.cnv2
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movss xmm2,.cz1
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movss xmm3,.cz2
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addps xmm0,.dn13
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addps xmm1,.dn12
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addss xmm2,.dz13
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addss xmm3,.dz12
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add eax,.dx13
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add ebx,.dx12
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movaps .cnv1,xmm0
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movaps .cnv2,xmm1
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movss .cz1,xmm2
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movss .cz2,xmm3
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add ecx,1
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cmp cx,.y2
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jl .rpt_loop1
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.rpt_loop1_end:
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movsx ecx,word .y2
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cmp cx,.y3
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jge .rpt_loop2_end
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movsx ebx,word .x2 ; eax - cur x1
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shl ebx,ROUND2 ; ebx - cur x2
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push dword .z2
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pop dword .cz2
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movaps xmm0,.2_nv
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movaps .cnv2,xmm0
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.rpt_loop2:
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pushad
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movaps xmm2,.y_min
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movaps xmm0,.cnv1
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movaps xmm1,.cnv2
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movlps xmm3,.cz1
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movaps xmm4,.l_v
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sar ebx,ROUND2
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sar eax,ROUND2
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mov edi,.screen
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mov esi,.Zbuf
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call real_phong_line_z
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popad
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movaps xmm0,.cnv1
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movaps xmm1,.cnv2
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movss xmm2,.cz1
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movss xmm3,.cz2
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addps xmm0,.dn13
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addps xmm1,.dn23
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addss xmm2,.dz13
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addss xmm3,.dz23
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add eax,.dx13
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add ebx,.dx23
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movaps .cnv1,xmm0
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movaps .cnv2,xmm1
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movss .cz1,xmm2
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movss .cz2,xmm3
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add ecx,1
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cmp cx,.y3
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jl .rpt_loop2
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.rpt_loop2_end:
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add esp,512
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pop ebp
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ret
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real_phong_line_z:
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; in:
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; xmm0 - normal vector 1
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; xmm1 - normal vect 2
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; xmm3 - lo -> hi z1, z2 coords as dwords floats
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; xmm2 - lo -> hi y_min, y_max, x_min, x_max
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; as dword integers
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; xmm4 - normalized light vector
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; eax - x1
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; ebx - x2
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; ecx - y
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; edi - screen buffer
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; esi - z buffer filled with dd floats
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push ebp
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mov ebp,esp
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sub esp,160
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sub ebp,16
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and ebp,0xfffffff0
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.n1 equ [ebp-16]
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.n2 equ [ebp-32]
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.lv equ [ebp-48]
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.lx1 equ [ebp-52]
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.lx2 equ [ebp-56]
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.z2 equ [ebp-60]
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.z1 equ [ebp-64]
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.screen equ [ebp-68]
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.zbuff equ [ebp-72]
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.x_max equ [ebp-74]
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.x_min equ [ebp-76]
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.y_max equ [ebp-78]
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.y_min equ [ebp-80]
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.dn equ [ebp-96]
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.dz equ [ebp-100]
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.y equ [ebp-104]
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.cnv equ [ebp-128]
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mov .y,ecx
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packssdw xmm2,xmm2
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movq .y_min,xmm2
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cmp cx,.y_min
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jl .end_rp_line
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cmp cx,.y_max
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jge .end_rp_line ;
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cmp eax,ebx
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je .end_rp_line
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jl @f
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xchg eax,ebx
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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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shufps xmm3,xmm3,11100001b
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@@:
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cmp ax,.x_max
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jge .end_rp_line
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cmp bx,.x_min
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jle .end_rp_line
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movaps .lv,xmm4
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movaps .n1,xmm0
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movaps .n2,xmm1
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mov .lx1,eax
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mov .lx2,ebx
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movlps .z1,xmm3
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sub ebx,eax
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cvtsi2ss xmm7,ebx
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shufps xmm7,xmm7,0
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subps xmm1,xmm0
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divps xmm1,xmm7
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movaps .dn,xmm1
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psrldq xmm3,4
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subss xmm3,.z1
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divss xmm3,xmm7
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movss .dz,xmm3
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mov ebx,.lx1
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cmp bx,.x_min ; clipping on function4
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jge @f
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movzx eax,word .x_min
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sub eax,ebx
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cvtsi2ss xmm7,eax
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shufps xmm7,xmm7,0
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|
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mulss xmm3,xmm7
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mulps xmm1,xmm7
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addss xmm3,.z1
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|
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addps xmm1,.n1
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|
|
movsx eax,word .x_min
|
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|
|
movss .z1,xmm3
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|
|
movaps .n1,xmm1
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|
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mov dword .lx1,eax
|
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|
@@:
|
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|
|
|
movzx eax,word .x_max
|
|
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|
|
cmp .lx2,eax
|
|
|
|
|
jl @f
|
|
|
|
|
mov .lx2,eax
|
|
|
|
|
@@:
|
|
|
|
|
movzx eax,word[size_x_var]
|
|
|
|
|
mul dword .y
|
|
|
|
|
; mov edx,.x1
|
|
|
|
|
add eax,.lx1
|
|
|
|
|
shl eax,2
|
|
|
|
|
add edi,eax
|
|
|
|
|
add esi,eax
|
|
|
|
|
|
|
|
|
|
mov ecx,.lx2
|
|
|
|
|
sub ecx,.lx1
|
|
|
|
|
movaps xmm0,.n1
|
|
|
|
|
movss xmm2,.z1
|
2021-12-28 09:18:43 +01:00
|
|
|
|
2021-11-03 17:39:08 +01:00
|
|
|
.ddraw:
|
|
|
|
|
movss xmm7,xmm2
|
|
|
|
|
cmpnltss xmm7,dword[esi]
|
|
|
|
|
movd eax,xmm7
|
|
|
|
|
or eax,eax
|
|
|
|
|
jnz .skip
|
|
|
|
|
movss [esi],xmm2
|
|
|
|
|
movaps xmm7,xmm0
|
|
|
|
|
mulps xmm7,xmm7 ; normalize
|
|
|
|
|
haddps xmm7,xmm7
|
|
|
|
|
haddps xmm7,xmm7
|
|
|
|
|
rsqrtps xmm7,xmm7
|
|
|
|
|
mulps xmm7,xmm0
|
|
|
|
|
movaps .cnv,xmm7
|
|
|
|
|
|
|
|
|
|
mov edx,lights_aligned ; lights - global variable
|
|
|
|
|
xorps xmm1,xmm1 ; instead global can be used .lv - light vect.
|
|
|
|
|
@@:
|
|
|
|
|
movaps xmm6,[edx+16]
|
|
|
|
|
movaps xmm5,[edx]
|
|
|
|
|
movaps xmm3,[edx+48]
|
|
|
|
|
andps xmm5,[zero_hgst_dd] ; global
|
|
|
|
|
|
|
|
|
|
mulps xmm5,.cnv ;.lv ; last dword should be zeroed
|
|
|
|
|
haddps xmm5,xmm5
|
|
|
|
|
haddps xmm5,xmm5
|
|
|
|
|
; mulps xmm5,[env_const2]
|
|
|
|
|
; maxps xmm5,[dot_min]
|
|
|
|
|
; minps xmm5,[dot_max]
|
|
|
|
|
movaps xmm7,xmm5
|
|
|
|
|
; mulps xmm7,[env_const2]
|
|
|
|
|
; mulps xmm7,[env_const2]
|
|
|
|
|
; maxps xmm7,[dot_min]
|
|
|
|
|
; minps xmm7,[dot_max]
|
|
|
|
|
|
|
|
|
|
mulps xmm7,xmm7
|
|
|
|
|
mulps xmm7,xmm7
|
|
|
|
|
mulps xmm5,xmm6
|
|
|
|
|
mulps xmm7,xmm7
|
|
|
|
|
mulps xmm7,xmm3
|
|
|
|
|
|
|
|
|
|
addps xmm5,xmm7
|
|
|
|
|
minps xmm5,[mask_255f] ; global
|
|
|
|
|
maxps xmm1,xmm5
|
|
|
|
|
; movq xmm3,[edx+20] ; minimal color
|
|
|
|
|
; punpcklwd xmm3,[minimum0]
|
|
|
|
|
; cvtdq2ps xmm3,xmm3
|
|
|
|
|
; maxps xmm1,xmm3
|
|
|
|
|
add edx,64
|
|
|
|
|
cmp edx,lights_aligned_end ; global
|
|
|
|
|
jnz @b
|
|
|
|
|
|
|
|
|
|
cvtps2dq xmm1,xmm1
|
|
|
|
|
packssdw xmm1,xmm1
|
|
|
|
|
packuswb xmm1,xmm1
|
|
|
|
|
movd [edi],xmm1
|
|
|
|
|
.skip:
|
|
|
|
|
add edi,4
|
|
|
|
|
add esi,4
|
|
|
|
|
addps xmm0,.dn
|
|
|
|
|
addss xmm2,.dz
|
|
|
|
|
sub ecx,1
|
|
|
|
|
jnz .ddraw
|
|
|
|
|
|
|
|
|
|
.end_rp_line:
|
|
|
|
|
add esp,160
|
|
|
|
|
pop ebp
|
|
|
|
|
|
|
|
|
|
ret
|
