; Directional dusk lighting and aerial perspective are applied to actual geometry.
ShadeRoofCityPixel3D PROC uses ebx esi edi color:DWORD,depth:DWORD,light:DWORD,material:DWORD
    local fog:DWORD,inverseFog:DWORD,red:DWORD,green:DWORD,blue:DWORD,level:DWORD
    local targetR:DWORD,targetG:DWORD,targetB:DWORD
    mov roofPixelGlow3D,0
    mov eax,depth
    sar eax,16
    test eax,eax
    jns @F
    xor eax,eax
@@:
    cmp eax,1023
    jbe @F
    mov eax,1023
@@:
    movzx eax,roofFog3D[eax]
    mov fog,eax
    neg eax
    add eax,256
    mov inverseFog,eax
    mov eax,color
    and eax,255
    mov blue,eax
    mov eax,color
    shr eax,8
    and eax,255
    mov green,eax
    mov eax,color
    shr eax,16
    and eax,255
    mov red,eax
    mov targetR,171
    mov targetG,157
    mov targetB,177
    mov eax,light
    mov level,eax
    cmp roofNight3D,0
    je roof_lighting_day
    mov targetR,13
    mov targetG,24
    mov targetB,44
    mov level,72
    cmp material,ROOF_CITY_ROAD
    jne @F
    mov level,256
@@:
    cmp material,ROOF_LIGHT
    jne @F
    mov level,256
    mov roofPixelGlow3D,96
@@:
    cmp roofLandmarkLight3D,0
    je @F
    mov level,148
@@:
    cmp material,ROOF_BRASS
    jne @F
    mov level,228
    cmp roofLandmarkLight3D,0
    je @F
    mov roofPixelGlow3D,12
@@:
    ; Emission is tagged in the actual window pixels, never inferred from gold trim.
    cmp material,ROOF_FACADE
    jb roof_lighting_apply
    cmp material,ROOF_FACADE+7
    jbe roof_lighting_window
    cmp material,ROOF_MODERN_FACADE
    jb roof_lighting_apply
    cmp material,ROOF_MODERN_FACADE+7
    ja roof_lighting_apply
roof_lighting_window:
    mov eax,color
    shr eax,24
    cmp eax,255
    jne roof_lighting_apply
    mov level,310
    mov roofPixelGlow3D,64
    shr fog,1
    mov eax,fog
    neg eax
    add eax,256
    mov inverseFog,eax
    jmp roof_lighting_apply
roof_lighting_day:
    cmp material,ROOF_CITY_ROOF
    jne @F
    imul eax,red,180
    shr eax,8
    mov red,eax
    imul eax,green,220
    shr eax,8
    mov green,eax
@@:
    mov eax,red
    imul eax,263
    shr eax,8
    cmp eax,255
    jbe @F
    mov eax,255
@@:
    mov red,eax
    imul eax,blue,235
    shr eax,8
    mov blue,eax
roof_lighting_apply:
    mov eax,red
    imul eax,level
    shr eax,8
    cmp eax,255
    jbe @F
    mov eax,255
@@:
    imul eax,inverseFog
    mov ecx,targetR
    imul ecx,fog
    add eax,ecx
    shr eax,8
    mov ebx,eax
    shl ebx,16
    mov eax,green
    imul eax,level
    shr eax,8
    cmp eax,255
    jbe @F
    mov eax,255
@@:
    imul eax,inverseFog
    mov ecx,targetG
    imul ecx,fog
    add eax,ecx
    shr eax,8
    shl eax,8
    or ebx,eax
    mov eax,blue
    imul eax,level
    shr eax,8
    cmp eax,255
    jbe @F
    mov eax,255
@@:
    imul eax,inverseFog
    mov ecx,targetB
    imul ecx,fog
    add eax,ecx
    shr eax,8
    or eax,ebx
    ret
ShadeRoofCityPixel3D ENDP

SampleRoofGroundLight3D PROC uses ebx esi edi color:DWORD,wx:DWORD,wy:DWORD
    mov eax,color
    cmp roofLightingArt3D.pixels,0
    je roof_ground_light_done
    mov eax,wx
    sar eax,17
    add eax,256
    cmp eax,511
    ja roof_ground_light_original
    mov ebx,eax
    mov eax,wy
    sar eax,17
    add eax,256
    cmp eax,511
    ja roof_ground_light_original
    shl eax,9
    add eax,ebx
    mov esi,roofLightingArt3D.pixels
    cmp roofNight3D,0
    je @F
    add esi,512*512*4
@@:
    mov edx,[esi+eax*4]
    mov edi,edx
    and edx,255
    mov eax,color
    and eax,255
    imul eax,edx
    shr eax,8
    mov ebx,eax
    mov edx,edi
    shr edx,8
    and edx,255
    mov eax,color
    shr eax,8
    and eax,255
    imul eax,edx
    and eax,0FF00h
    or ebx,eax
    mov edx,edi
    shr edx,16
    and edx,255
    mov eax,color
    shr eax,16
    and eax,255
    imul eax,edx
    and eax,0FF00h
    shl eax,8
    or eax,ebx
    ret
roof_ground_light_original:
    mov eax,color
roof_ground_light_done:
    ret
SampleRoofGroundLight3D ENDP

PrepareRoofCityAA3D PROC uses ebx esi edi
    mov roofAAStill3D,0
    cmp roofAAValid3D,0
    je roof_aa_moving
    mov eax,playerX
    cmp eax,roofAAX3D
    jne roof_aa_moving
    mov eax,playerY
    cmp eax,roofAAY3D
    jne roof_aa_moving
    mov eax,playerAngle
    cmp eax,roofAAAngle3D
    jne roof_aa_moving
    mov eax,viewEye3D
    cmp eax,roofAAEye3D
    jne roof_aa_moving
    mov eax,viewHorizon3D
    cmp eax,roofAAHorizon3D
    jne roof_aa_moving
    mov eax,roofNight3D
    cmp eax,roofAATheme3D
    jne roof_aa_moving
    mov roofAAStill3D,1
    inc roofAAFrame3D
    and roofAAFrame3D,3
    jmp roof_aa_save_view
roof_aa_moving:
    mov roofAAFrame3D,0
roof_aa_save_view:
    mov eax,playerX
    mov roofAAX3D,eax
    mov eax,playerY
    mov roofAAY3D,eax
    mov eax,playerAngle
    mov roofAAAngle3D,eax
    mov eax,viewEye3D
    mov roofAAEye3D,eax
    mov eax,viewHorizon3D
    mov roofAAHorizon3D,eax
    mov eax,roofNight3D
    mov roofAATheme3D,eax
    mov eax,roofAAFrame3D
    shl eax,1
    sub eax,3
    mov ebx,eax
    mov eax,playerPlaneX
    imul ebx
    cdq
    mov ecx,SCREEN_W*4
    idiv ecx
    mov esi,eax
    mov eax,playerPlaneY
    imul ebx
    cdq
    idiv ecx
    mov edi,eax
    xor ebx,ebx
roof_aa_shift_ray:
    add cityRayX3D[ebx*4],esi
    add cityRayY3D[ebx*4],edi
    inc ebx
    cmp ebx,SCREEN_W
    jb roof_aa_shift_ray
    ret
PrepareRoofCityAA3D ENDP

FinishRoofCityAA3D PROC uses ebx esi edi
    xor edi,edi
roof_aa_pixel:
    mov eax,screenBuffer[edi*4]
    cmp roofAAStill3D,0
    je roof_aa_store
    cmp roofCityMask3D[edi],1
    jne roof_aa_store
    and eax,00FCFCFCh
    shr eax,2
    mov edx,roofAAHistory3D[edi*4]
    and edx,00FCFCFCh
    shr edx,2
    imul edx,3
    add eax,edx
    mov screenBuffer[edi*4],eax
roof_aa_store:
    mov roofAAHistory3D[edi*4],eax
    inc edi
    cmp edi,SCREEN_SIZE
    jb roof_aa_pixel
    mov roofAAValid3D,1
    ret
FinishRoofCityAA3D ENDP

RenderRoofCityBloom3D PROC uses ebx esi edi
    local pixel:DWORD,color:DWORD,amount:DWORD,rowOffset:DWORD,columnOffset:DWORD
    local target:DWORD,red:DWORD,green:DWORD,blue:DWORD
    cmp roofNight3D,0
    je roof_bloom_done
    mov pixel,SCREEN_W+1
roof_bloom_source:
    mov esi,pixel
    movzx eax,roofGlowMask3D[esi]
    test eax,eax
    jz roof_bloom_next_source
    shr eax,2
    mov amount,eax
    mov eax,screenBuffer[esi*4]
    mov color,eax
    mov rowOffset,-1
roof_bloom_row:
    mov columnOffset,-1
roof_bloom_column:
    mov eax,rowOffset
    imul eax,SCREEN_W
    add eax,columnOffset
    add eax,pixel
    cmp eax,SCREEN_SIZE
    jae roof_bloom_next_column
    mov target,eax
    lea edi,screenBuffer[eax*4]
    mov ebx,[edi]
    mov eax,color
    and eax,255
    imul eax,amount
    shr eax,8
    movzx ecx,bl
    add eax,ecx
    cmp eax,255
    jbe @F
    mov eax,255
@@:
    mov blue,eax
    mov eax,color
    shr eax,8
    and eax,255
    imul eax,amount
    shr eax,8
    mov ecx,ebx
    shr ecx,8
    and ecx,255
    add eax,ecx
    cmp eax,255
    jbe @F
    mov eax,255
@@:
    mov green,eax
    mov eax,color
    shr eax,16
    and eax,255
    imul eax,amount
    shr eax,8
    shr ebx,16
    and ebx,255
    add eax,ebx
    cmp eax,255
    jbe @F
    mov eax,255
@@:
    shl eax,16
    mov ecx,green
    shl ecx,8
    or eax,ecx
    or eax,blue
    mov [edi],eax
roof_bloom_next_column:
    inc columnOffset
    cmp columnOffset,1
    jle roof_bloom_column
    inc rowOffset
    cmp rowOffset,1
    jle roof_bloom_row
roof_bloom_next_source:
    inc pixel
    cmp pixel,SCREEN_SIZE-SCREEN_W-1
    jb roof_bloom_source
roof_bloom_done:
    ret
RenderRoofCityBloom3D ENDP