; A single rigid sprite transform aligns the dart axis with the live target.
DrawDartsArm3D PROC uses ebx esi edi pose:DWORD,targetX:SDWORD,targetY:SDWORD
    local originX:DWORD,originY:DWORD,left:DWORD,right:DWORD,bottom:DWORD,row:DWORD,column:DWORD
    local deltaX:DWORD,deltaY:DWORD,sourceX:DWORD,framePtr:DWORD
    mov eax,pose
    shl eax,18
    add eax,dtHands3D.pixels
    mov framePtr,eax
    mov eax,targetX
    sub eax,10
    mov originX,eax
    mov left,eax
    add eax,363
    mov right,eax
    mov eax,targetY
    add eax,49
    mov originY,eax
    add eax,182
    cmp eax,400
    jle @F
    mov eax,400
@@:
    mov bottom,eax
    mov eax,originY
    sub eax,182
    cmp eax,32
    jge @F
    mov eax,32
@@:
    mov row,eax
    cmp left,0
    jge @F
    mov left,0
@@:
    cmp right,640
    jle dt_arm_row
    mov right,640
dt_arm_row:
    mov eax,row
    cmp eax,bottom
    jge dt_arm_done
    sub eax,originY
    mov deltaY,eax
    mov eax,left
    mov column,eax
dt_arm_column:
    mov eax,column
    cmp eax,right
    jge dt_arm_next_row
    sub eax,originX
    mov deltaX,eax
    sub eax,deltaY
    imul eax,46341
    sar eax,16
    cmp eax,256
    jae dt_arm_skip
    mov sourceX,eax
    mov eax,deltaX
    add eax,deltaY
    imul eax,46341
    sar eax,16
    cmp eax,256
    jae dt_arm_skip
    shl eax,8
    add eax,sourceX
    mov esi,framePtr
    mov eax,[esi+eax*4]
    test eax,80000000h
    jz dt_arm_skip
    and eax,00FFFFFFh
    mov edx,row
    imul edx,640
    add edx,column
    mov screenBuffer[edx*4],eax
dt_arm_skip:
    inc column
    jmp dt_arm_column
dt_arm_next_row:
    inc row
    jmp dt_arm_row
dt_arm_done:
    ret
DrawDartsArm3D ENDP

; Furniture is attached to fixed world planes, never camera-facing billboards.
DrawDartsProps3D PROC uses ebx esi edi
    local item:DWORD,column:DWORD,depth:DWORD,sourceU:DWORD,packPtr:DWORD
    local firstY:DWORD,lastY:DWORD,row:DWORD,sourceY:DWORD,stepY:DWORD,span:DWORD
    mov item,0
dt_prop_item:
    imul eax,item,28
    lea esi,dtProps3D[eax]
    mov eax,[esi+24]
    mov packPtr,eax
    mov column,0
dt_prop_column:
    mov ebx,column
    cmp dword ptr [esi],0
    jne dt_prop_side
    mov ecx,dtRayZ3D[ebx*4]
    mov eax,[esi+4]
    sub eax,dtCamZ3D
    jmp dt_prop_distance
dt_prop_side:
    mov ecx,dtRayX3D[ebx*4]
    mov eax,[esi+4]
    sub eax,dtCamX3D
dt_prop_distance:
    test ecx,ecx
    jz dt_prop_next_column
    shl eax,16
    cdq
    idiv ecx
    cmp eax,40
    jl dt_prop_next_column
    cmp eax,dtRayDepth3D[ebx*4]
    jge dt_prop_next_column
    mov depth,eax
    mov eax,dtRayX3D[ebx*4]
    mov edi,dtCamX3D
    cmp dword ptr [esi],0
    je @F
    mov eax,dtRayZ3D[ebx*4]
    mov edi,dtCamZ3D
@@:
    imul depth
    shrd eax,edx,16
    add eax,edi
    sub eax,[esi+8]
    js dt_prop_next_column
    mov ecx,[esi+12]
    sub ecx,[esi+8]
    cmp eax,ecx
    jge dt_prop_next_column
    mov edi,packPtr
    imul eax,[edi].AnimPack3D.imageWidth
    cdq
    idiv ecx
    mov sourceU,eax
    mov eax,[esi+20]
    sub eax,dtCamY3D
    imul eax,dtLens3D
    cdq
    idiv depth
    mov ecx,dtScreenY3D
    sub ecx,eax
    mov firstY,ecx
    mov eax,[esi+16]
    sub eax,dtCamY3D
    imul eax,dtLens3D
    cdq
    idiv depth
    mov ecx,dtScreenY3D
    sub ecx,eax
    mov lastY,ecx
    sub ecx,firstY
    jle dt_prop_next_column
    mov span,ecx
    mov eax,[edi].AnimPack3D.height
    shl eax,16
    xor edx,edx
    div span
    mov stepY,eax
    mov eax,firstY
    cmp eax,32
    jge @F
    mov eax,32
@@:
    mov row,eax
    sub eax,firstY
    imul eax,stepY
    mov sourceY,eax
    cmp lastY,400
    jle dt_prop_row
    mov lastY,400
dt_prop_row:
    mov eax,row
    cmp eax,lastY
    jge dt_prop_next_column
    mov eax,sourceY
    shr eax,16
    cmp eax,[edi].AnimPack3D.height
    jae dt_prop_next_column
    imul eax,[edi].AnimPack3D.imageWidth
    add eax,sourceU
    mov edx,[edi].AnimPack3D.pixels
    mov eax,[edx+eax*4]
    test eax,80000000h
    jz @F
    mov edx,row
    imul edx,640
    add edx,column
    and eax,00FFFFFFh
    mov screenBuffer[edx*4],eax
@@:
    mov eax,stepY
    add sourceY,eax
    inc row
    jmp dt_prop_row
dt_prop_next_column:
    inc column
    cmp column,640
    jb dt_prop_column
    inc item
    cmp item,4
    jb dt_prop_item
    ret
DrawDartsProps3D ENDP

; Write chalk glyphs directly into the wall texture, so the score follows perspective.
DartsWallText3D PROC uses ebx esi edi px:DWORD,py:DWORD,textPtr:DWORD
    local row:DWORD,column:DWORD,pen:DWORD,glyph:DWORD
    mov esi,textPtr
    mov eax,px
    mov pen,eax
dt_chalk_char:
    movzx eax,byte ptr [esi]
    test eax,eax
    jz dt_chalk_done
    lea eax,font8x8[eax*8]
    mov glyph,eax
    mov row,0
dt_chalk_row:
    mov eax,glyph
    mov edx,row
    movzx ebx,byte ptr [eax+edx]
    mov column,0
dt_chalk_pixel:
    test ebx,80h
    jz @F
    mov eax,row
    add eax,py
    shl eax,9
    add eax,pen
    add eax,column
    mov edi,dtWall3D.pixels
    mov dword ptr [edi+eax*4],0FFD8D9C2h
@@:
    shl ebx,1
    inc column
    cmp column,8
    jb dt_chalk_pixel
    inc row
    cmp row,8
    jb dt_chalk_row
    add pen,8
    inc esi
    jmp dt_chalk_char
dt_chalk_done:
    ret
DartsWallText3D ENDP

UpdateDartsWall3D PROC uses ebx esi edi
    cmp dtWallDirty3D,0
    je dt_wall_score_done
    cmp dtWall3D.pixels,0
    je dt_wall_score_done
    mov ebx,104
dt_chalk_clear:
    mov eax,ebx
    shl eax,9
    add eax,32
    mov edi,dtWall3D.pixels
    lea edi,[edi+eax*4]
    mov ecx,102
    mov eax,0FF202623h
    rep stosd
    inc ebx
    cmp ebx,282
    jb dt_chalk_clear
    invoke DartsWallText3D,40,108,OFFSET dtYou
    invoke DartsWallText3D,86,108,OFFSET dtBot
    invoke FormatNumber,dtScores3D,OFFSET hudNumBuffer
    invoke DartsWallText3D,40,126,OFFSET hudNumBuffer
    invoke FormatNumber,dtScores3D[4],OFFSET hudNumBuffer
    invoke DartsWallText3D,86,126,OFFSET hudNumBuffer
    mov ebx,dtHistoryRows3D
    sub ebx,7
    jns @F
    xor ebx,ebx
@@:
    mov esi,150
dt_chalk_history:
    cmp ebx,dtHistoryRows3D
    jae dt_chalk_clean
    invoke FormatNumber,dtHistory3D[ebx*8],OFFSET hudNumBuffer
    invoke DartsWallText3D,40,esi,OFFSET hudNumBuffer
    invoke FormatNumber,dtHistory3D[ebx*8+4],OFFSET hudNumBuffer
    invoke DartsWallText3D,86,esi,OFFSET hudNumBuffer
    add esi,17
    inc ebx
    jmp dt_chalk_history
dt_chalk_clean:
    mov dtWallDirty3D,0
dt_wall_score_done:
    ret
UpdateDartsWall3D ENDP

DrawDartsScoreboard3D PROC uses ebx esi edi
    invoke DrawBoxBorder,54,23,212,174,001A2420h,00B0A16Eh,2
    invoke DrawString8x8,70,32,OFFSET dtScoreTitle,00E9DEBAh
    invoke DrawString8x8,118,49,OFFSET dtYou,0090CDB9h
    invoke DrawString8x8,198,49,OFFSET dtBot,00E8D7ADh
    mov ebx,dtHistoryRows3D
    sub ebx,10
    jns @F
    xor ebx,ebx
@@:
    mov esi,65
dt_scoreboard_row:
    cmp ebx,dtHistoryRows3D
    jae dt_scoreboard_current
    lea eax,[ebx+1]
    invoke FormatNumber,eax,OFFSET hudNumBuffer
    invoke DrawString8x8,70,esi,OFFSET hudNumBuffer,008A9C91h
    invoke FormatNumber,dtHistory3D[ebx*8],OFFSET hudNumBuffer
    invoke DrawString8x8,118,esi,OFFSET hudNumBuffer,00E2E2CFh
    invoke FormatNumber,dtHistory3D[ebx*8+4],OFFSET hudNumBuffer
    invoke DrawString8x8,198,esi,OFFSET hudNumBuffer,00E2E2CFh
    add esi,10
    inc ebx
    jmp dt_scoreboard_row
dt_scoreboard_current:
    invoke DrawBox,66,170,188,1,00758772h
    invoke FormatNumber,dtScores3D,OFFSET hudNumBuffer
    invoke DrawString8x8,118,180,OFFSET hudNumBuffer,00FFFFFFh
    invoke FormatNumber,dtScores3D[4],OFFSET hudNumBuffer
    invoke DrawString8x8,198,180,OFFSET hudNumBuffer,00FFFFFFh
    ret
DrawDartsScoreboard3D ENDP