411 lines
8.7 KiB
NASM
411 lines
8.7 KiB
NASM
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;; Copyright (c) 1992,1993-1995 Argonaut Technologies Limited. All rights reserved.
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;;
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;; $Id: T15_PIZP.ASM 1.2 1996/11/14 14:44:16 NIKH Exp $
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;; $Locker: $
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;;
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;; Scanline loop for 15 bit perpsective correct texture mapping
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;;
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.386p
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.model c,flat
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include drv.inc
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.data
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z dd ?
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i dd ?
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du_numerator dd ?
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dv_numerator dd ?
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u_numerator dd ?
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v_numerator dd ?
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zdest dd ?
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dest dd ?
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dest2 dd ?
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source dd ?
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denominator dd ?
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dz dd ?
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align 4
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.code
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; Smoothly lit perspective texture mapping
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ScanLinePIZ2TIP macro name,pre,incu,decu,incv,decv,post1,post2,BLEND
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name proc
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pushad
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; Copy various parameters into registers
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mov esi,work.pu.current
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mov ebx,work.pv.current
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mov eax,work.pu.grad_x
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mov edi,work.pv.grad_x
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mov dv_numerator,edi
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mov ecx,work.pi.current
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mov edx,work.pq.current
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mov v_numerator,ebx
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mov denominator,edx
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mov i,ecx
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mov ecx,work.pz.current
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mov z,ecx
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mov ecx,work.tsl.zstart
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mov zdest,ecx
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mov ebp,work.tsl._end
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mov du_numerator,eax
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mov edi,work.tsl.start
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mov eax,work.tsl.source
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cmp edi,ebp
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mov ebp,zdest
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ja rtol ; Jump if right to left
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; Left to right scan
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mov dest,edi
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next_pixelb:
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jae L50 ; Jump if end of scan
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mov source,eax ; Free up eax
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; Texel fetch and store section
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; z buffer test
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mov dl,[ebp]
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mov ebx,z ; Get new z value
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mov dh,1[ebp]
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ror ebx,16
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cmp bx,dx
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ja L34 ; Jump if new pixel behind old
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mov edx,work.texture.base
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xor ecx,ecx
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;; Get texel and test for transparency
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mov cl,[eax+edx]
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if 1
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test cl,cl
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jz L34
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endif
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;; Store texel and z
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mov eax,work.shade_table
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mov ch,byte ptr i+2
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lea eax,[2*ecx+eax]
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if BLEND
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mov cx,[eax] ; Get lit texel
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mov dx,[edi] ; Get screen pixel
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if BLEND-16
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shr ecx,1 ; Halve src & dest colours
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and edx,07bdeh ;
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shr edx,1 ;
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and ecx,03defh ;
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else
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shr ecx,1 ; Halve src & dest colours
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and edx,0f7deh ;
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shr edx,1 ;
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and ecx,07befh ;
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endif
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add ecx,edx ; Add together to blend them
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else
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mov [ebp],bx ; Store new z
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mov cx,[eax] ; Get lit texel
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endif
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mov [edi],cx ; Store texel
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L34:
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ror ebx,16
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mov edx,work.pz.grad_x ; Get z step
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add ebp,2 ; zdest++
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add ebx,edx ; z += dz
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mov edx,i ; Get lighting
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mov eax,work.pi.grad_x
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add edx,eax ; i += di
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mov i,edx
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L34a:
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lea edi,2[edi]
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if 1
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cmp edi,work.tsl._end
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jae L50
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endif
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mov edx,denominator
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mov dest,edi
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mov edi,dv_numerator
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mov z,ebx
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mov zdest,ebp
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mov ecx,work.pq.grad_x
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mov ebp,du_numerator
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mov ebx,v_numerator
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mov eax,source ; Restore eax
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; Perspective calculation section
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pre
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sub esi,ebp
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add edx,ecx
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cmp esi,edx
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jl L36 ; Jump if u not too large
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mov ecx,work.pq.grad_x
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mov ebp,du_numerator
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sub esi,edx
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incufloop:
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incu ; Increment u
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add ebp,ecx
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sub esi,edx
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jge incufloop
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add esi,edx
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mov du_numerator,ebp
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jmp L37
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L36:
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test esi,esi
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jge L37
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mov ebp,du_numerator
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decufloop:
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decu
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sub ebp,work.pq.grad_x
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add esi,edx
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jnc decufloop
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mov du_numerator,ebp
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L37:
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sub ebx,edi
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jl decvf
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L40a:
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cmp ebx,edx
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jge incvf ; Jump if v not too small
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jmp L40
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decvf:
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mov ebp,work.pq.grad_x
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decvfloop:
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decv ; Decrement v
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sub edi,ebp
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add ebx,edx
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jnc decvfloop
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mov dv_numerator,edi
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L40:
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post1
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post2
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mov denominator,edx
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mov v_numerator,ebx
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mov edi,dest
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cmp edi,work.tsl._end
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mov ebp,zdest
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jmp next_pixelb
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; Right to left
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rtol:
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mov dest,edi
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next_pixelbr:
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jbe L50 ; Jump if end of scan
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mov source,eax ; Free up eax
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; z buffer test
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mov dl,[ebp]
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mov ebx,z ; Get new z value
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mov dh,1[ebp]
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ror ebx,16
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cmp bx,dx
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ja R34 ; Jump if new pixel behind old
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mov edx,work.texture.base
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xor ecx,ecx
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;; Get texel and test for transparency
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mov cl,[edx+eax]
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if 1
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test cl,cl ; Transparent?
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jz R34
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endif
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;; Store texel and z
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mov eax,work.shade_table
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mov ch,byte ptr i+2
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lea eax,[2*ecx+eax]
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if BLEND
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mov cx,[eax] ; Get lit texel
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mov dx,[edi] ; Get screen pixel
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if BLEND-16
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shr ecx,1 ; Halve src & dest colours
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and edx,07bdeh ;
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shr edx,1 ;
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and ecx,03defh ;
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else
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shr ecx,1 ; Halve src & dest colours
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and edx,0f7deh ;
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shr edx,1 ;
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and ecx,07befh ;
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endif
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add ecx,edx ; Add together to blend them
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else
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mov [ebp],bx ; Store new z
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mov cx,[eax] ; Get lit texel
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endif
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mov [edi],cx ; Store texel
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R34:
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sub ebp,2 ; zdest++
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;; Update lighting and z
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ror ebx,16
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mov edx,work.pz.grad_x ; Get z step
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mov eax,work.pi.grad_x
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sub ebx,edx ; z += dz
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mov edx,i ; Get lighting
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sub edx,eax ; i += di
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mov i,edx
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R34a:
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lea edi,(-2)[edi]
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if 1
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cmp edi,work.tsl._end
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jbe L50
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endif
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mov edx,denominator
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mov dest,edi
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mov edi,dv_numerator
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mov z,ebx
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mov zdest,ebp
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mov ecx,work.pq.grad_x
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mov ebp,du_numerator
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mov ebx,v_numerator
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mov eax,source ; Restore eax
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; Core perspective calculations
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pre
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add esi,ebp
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sub edx,ecx
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cmp esi,edx
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jge incub ; Jump if u not too large
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R36:
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test esi,esi
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jl decub
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R37:
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add ebx,edi
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jl decvb
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cmp ebx,edx
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jge incvb ; Jump if v not too small
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R40:
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post1
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post2
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mov denominator,edx
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mov v_numerator,ebx
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mov edi,dest
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cmp edi,work.tsl._end
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mov ebp,zdest
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jmp next_pixelbr
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L50:
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popad
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ret
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incvf:
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mov ecx,work.pq.grad_x
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sub ebx,edx
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incvfloop:
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incv ; Increment v
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add edi,ecx
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sub ebx,edx
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jge incvfloop
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add ebx,edx
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mov dv_numerator,edi
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jmp L40
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; Back
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decub:
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mov ebp,du_numerator
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decubloop:
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decu
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sub ebp,work.pq.grad_x
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add esi,edx
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jnc decubloop
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mov du_numerator,ebp
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jmp R37
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incub:
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mov ecx,work.pq.grad_x
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mov ebp,du_numerator
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sub esi,edx
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incubloop:
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incu ; Increment u
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add ebp,ecx
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sub esi,edx
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jge incubloop
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add esi,edx
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mov du_numerator,ebp
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jmp R37
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decvb:
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mov ebp,work.pq.grad_x
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decvbloop:
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decv ; Decrement v
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sub edi,ebp
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add ebx,edx
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jnc decvbloop
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mov dv_numerator,edi
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jmp R40
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incvb:
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mov ecx,work.pq.grad_x
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sub ebx,edx
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incvbloop:
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incv ; Increment v
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add edi,ecx
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sub ebx,edx
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jge incvbloop
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add ebx,edx
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mov dv_numerator,edi
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jmp R40
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name endp
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endm
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if PARTS and PART_15Z
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ScanLinePIZ2TIP ScanLinePIZ2TIP256_RGB_555,\
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<>,\
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<inc al>,<dec al>,<inc ah>,<dec ah>,\
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<>,<>
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ScanLinePIZ2TIP ScanLinePIZ2TIPB256_RGB_555,\
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<>,\
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<inc al>,<dec al>,<inc ah>,<dec ah>,\
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<>,<>,15
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endif
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if PARTS and PART_16Z
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ScanLinePIZ2TIP ScanLinePIZ2TIPB256_RGB_565,\
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<>,\
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<inc al>,<dec al>,<inc ah>,<dec ah>,\
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<>,<>,16
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endif
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end
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