221 lines
4.3 KiB
NASM
221 lines
4.3 KiB
NASM
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; outer loop could easily be optimised
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.586p
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.model flat,c
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include drv.inc
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include common.inc
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include fpsetup.inc
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include fpwork.inc
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.code
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majorScanAddress equ scratch0
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DRAW_ZI_I8_D16_ShadeTable macro minorX,direction,half
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local drawPixel,drawLine,done,lineDrawn,noPlot
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mov ebx,workspace.&half&Count
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mov edi,workspace.scanAddress
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cmp ebx,0
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jl done
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mov esi,workspace.s_i
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mov edx,workspace.s_z
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mov workspace.c_i,esi
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mov workspace.c_z,edx
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mov ecx,workspace.s_i
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mov ebx,workspace.s_z
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mov ebp,workspace.depthAddress
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mov edx,workspace.minorX
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drawLine:
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shr edx,16
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mov esi,workspace.xm
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shr esi,16
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add edi,edx
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ror ecx,16
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xor eax,eax
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ror ebx,16
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sub esi,edx
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mov workspace.majorScanAddress,edi
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lea ebp,[ebp+2*edx]
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jg_d lineDrawn,direction
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drawPixel:
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mov al,byte ptr work.index_base
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mov edi,workspace.d_i_x
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mov ah,cl
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mov dl,[ebp+2*esi]
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add_d ecx,edi,direction
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mov edi,work.shade_table
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adc_d ecx,0,direction
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mov dh,[ebp+2*esi+1]
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mov al,[edi+eax]
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mov edi,workspace.majorScanAddress
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cmp bx,dx ;2 cycles
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ja noPlot
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mov [ebp+2*esi],bl
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mov [edi+esi],al
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mov [ebp+2*esi+1],bh
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noPlot:
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mov edi,workspace.d_z_x
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add_d ebx,edi,direction
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; stall
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adc_d ebx,0,direction
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inc_d esi,direction
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; stall
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jle_d drawPixel,direction
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lineDrawn:
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mov ebx,workspace.xm_f
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mov edx,workspace.d_xm_f
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add ebx,edx
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sbb ecx,ecx
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mov workspace.xm_f,ebx
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mov edi,workspace.scanAddress
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add edi,work.colour.stride_b ;two cycles
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mov workspace.scanAddress,edi
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mov ebp,workspace.depthAddress
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add ebp,work.depth.stride_b
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mov workspace.depthAddress,ebp
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mov ebx,workspace.s_z
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add ebx,[workspace.d_z_y_0+8*ecx] ;two cycles
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mov workspace.s_z,ebx
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mov edx,workspace.s_i
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add edx,[workspace.d_i_y_0+8*ecx]
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mov workspace.s_i,edx
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mov ecx,edx ;probably will optimise out
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mov esi,workspace.xm
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add esi,workspace.d_xm ;two cycles
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mov workspace.xm,esi
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mov edx,workspace.minorX
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add edx,workspace.d_&minorX
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mov workspace.minorX,edx
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mov esi,workspace.&half&Count
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dec esi
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mov workspace.&half&Count,esi
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jge drawLine
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done:
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endm
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if PARTS and PART_8Z
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TriangleRender_ZI_I8_D16_ShadeTable proc dummy:dword, v0:ptr brp_vertex, v1:ptr brp_vertex, v2:ptr brp_vertex
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mov edx,v2
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mov eax,v0
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mov ecx,v1
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mov workspace.v2,edx
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mov workspace.v0,eax
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mov workspace.v1,ecx
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call TriangleSetup_ZTI
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TriangleRasterise_ZTI_I8_D16_256 label proc
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; Floating point address calculation - 20 cycles, (Integer=26)
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; st(0) st(1) st(2) st(3) st(4) st(5) st(6) st(7)
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fild work.colour.base ; cb
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fild workspace.t_y ; ty cb
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fild work.depth.base ; db ty cb
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fild work.colour.stride_b ; cs db ty cb
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fild work.depth.stride_b ; ds cs db ty cb
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fxch st(4) ; cb cs db ty ds
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fsub fp_one ; cb-1 cs db ty ds
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fxch st(3) ; ty cs db cb-1 ds
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fsub fp_one ; ty-1 cs db cb-1 ds
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fxch st(2) ; db cs ty-1 cb-1 ds
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fsub fp_two ; db-2 cs ty-1 cb-1 ds
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fxch st(3) ; cb-1 cs ty-1 db-2 ds
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fadd fp_conv_d ; cb-1I cs ty-1 db-2 ds
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fxch st(1) ; cs cb-1I ty-1 db-2 ds
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fmul st,st(2) ; csy cb-1I ty-1 db-2 ds
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fxch st(3) ; db-2 cb-1I ty-1 csy ds
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fadd fp_conv_d ; db-2I cb-1I ty-1 csy ds
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fxch st(2) ; ty-1 cb-1I db-2I csy ds
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fmulp st(4),st ; cb-1I db-2I csy dsy
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faddp st(2),st ; db-2I ca dsy
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;stall
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faddp st(2),st ; ca da
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fstp qword ptr workspace.scanAddress
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fstp qword ptr workspace.depthAddress
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mov edx,workspace.d_z_x
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cmp edx,80000000
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adc edx,-1
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ror edx,16
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mov workspace.d_z_x,edx
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mov edx,workspace.d_i_x
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cmp edx,80000000
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adc edx,-1
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ror edx,16
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mov workspace.d_i_x,edx
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mov eax,workspace.xm
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shl eax,16
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mov ebx,workspace.d_xm
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shl ebx,16
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mov workspace.xm_f,eax
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mov workspace.d_xm_f,ebx
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mov eax,workspace.flip
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test eax,eax
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jnz drawRL
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DRAW_ZI_I8_D16_ShadeTable x1,DRAW_LR,top
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DRAW_ZI_I8_D16_ShadeTable x2,DRAW_LR,bottom
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ret
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drawRL:
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DRAW_ZI_I8_D16_ShadeTable x1,DRAW_RL,top
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DRAW_ZI_I8_D16_ShadeTable x2,DRAW_RL,bottom
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ret
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TriangleRender_ZI_I8_D16_ShadeTable endp
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endif
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.data
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fp_one dword 1.0
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fp_two dword 2.0
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fp_conv_d dword (127+52-0) shl 23 + (1 shl 22)
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end
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