mirror of
https://github.com/ondra-novak/gates_of_skeldal.git
synced 2025-07-05 06:00:33 -04:00
380 lines
13 KiB
NASM
380 lines
13 KiB
NASM
.model small
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.386
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DGROUP group _DATA
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tzoom struc
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startptr DD ? ;0
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texture DD ? ;4
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textline DD ? ;8
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linelen DD ? ;12
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xtable DD ? ;16
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ytable DD ? ;20
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palette DD ? ;24
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ycount DW ? ;28
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xmax DW ?
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tzoom ends
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extrn _zoom:dword [8]
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extrn _lbuffer:dword
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extrn _screen:dword
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_TEXT segment byte public 'CODE' use32
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assume CS:_TEXT
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assume DS:DGROUP
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public sikma_zleva_
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sikma_zleva_:
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mov edi,_zoom ;nacti ukazatel do obrazovky
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mov ebx,_zoom[offset tzoom.palette] ;ukazatel na paletu
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mov cx,word ptr _zoom[offset tzoom.ycount] ;velikost textury na y
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shl ecx,16 ;vloz do horni pulky ecx
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mov esi,_zoom[offset tzoom.texture] ;nacti ukazatel na texturu
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skzl3: mov edx,_zoom[offset tzoom.xtable] ;nacti ukazetel na zvetsovaci tabulku x
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push esi ;uchovej esi
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push edi ;uchovej edi
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mov cx,_zoom[offset tzoom.xmax]
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skzl1: xor eax,eax ;vynuluj eax pro spravny vypocet
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lodsb ;nacti bod
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add esi,[edx] ;posun se od nekolik pozic v texture podle hodnoty v tabulce x
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add edx,4 ;posun se v tabulce x o dalsi polozku
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or al,al ;test bodu na nulu
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jz skz1 ;preskoc transparetni barvu
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cmp al,1 ;test bodu na jedna
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jz skz2 ;ukonci kresleni linky pokud narazi na 1
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mov ax,[eax*2+ebx] ;konverze barvy podle palety
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mov [edi],ax ;nakresli bod na obrazovce
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skz1: add edi,2 ;dalsi pozice
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dec cx
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jnz skzl1 ;opakuj dokola
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skz2: pop edi ;obnov edi
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pop esi ;obnov esi
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mov edx,_zoom[offset tzoom.ytable] ;vyzvedni ukazatel na ytable
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mov cx,[edx] ;cx - o kolik pozic se mam v texture posunout dolu
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or cx,cx
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jz skzskp
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skzl2: add esi,_zoom[offset tzoom.textline] ;posun o jednu pozici
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dec cx ;sniz citac
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jnz skzl2 ;dokud neni nula
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skzskp:add edx,2 ;dalsi hodnota v tabulce
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mov _zoom[offset tzoom.ytable],edx ;uloaz na puvodni misto
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sub edi,_zoom[offset tzoom.linelen] ;odecti tolik, kolik odpovida lince na obrazovce
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sub ecx,10000h ;sniz horni pulku ecx o jedna
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jnz skzl3 ;opakuj dokud neni nula
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ret
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public sikma_zprava_
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sikma_zprava_:
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mov edi,_zoom ;nacti ukazatel do obrazovky
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mov ebx,_zoom[offset tzoom.palette] ;ukazatel na paletu
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mov cx,word ptr _zoom[offset tzoom.ycount] ;velikost textury na y
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shl ecx,16 ;vloz do horni pulky ecx
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mov esi,_zoom[offset tzoom.texture] ;nacti ukazatel na texturu
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skzp3: mov edx,_zoom[offset tzoom.xtable] ;nacti ukazetel na zvetsovaci tabulku x
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push esi ;uchovej esi
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push edi ;uchovej edi
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mov cx,_zoom[offset tzoom.xmax]
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skzp1: xor eax,eax ;vynuluj eax pro spravny vypocet
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lodsb ;nacti bod
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add esi,[edx] ;posun se od nekolik pozic v texture podle hodnoty v tabulce x
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add edx,4 ;posun se v tabulce x o dalsi polozku
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or al,al ;test bodu na nulu
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jz skz3 ;preskoc transparetni barvu
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cmp al,1 ;test bodu na jedna
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jz skz4 ;ukonci kresleni linky pokud narazi na 1
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mov ax,[eax*2+ebx] ;konverze barvy podle palety
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mov [edi],ax ;nakresli bod na obrazovce
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skz3: sub edi,2 ;dalsi pozice
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dec cx
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jnz skzp1 ;opakuj dokola
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skz4: pop edi ;obnov edi
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pop esi ;obnov esi
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mov edx,_zoom[offset tzoom.ytable] ;vyzvedni ukazatel na ytable
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mov cx,[edx] ;cx - o kolik pozic se mam v texture posunout dolu
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or cx,cx
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jz skpskp
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skzp2: add esi,_zoom[offset tzoom.textline] ;posun o jednu pozici
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dec cx ;sniz citac
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jnz skzp2 ;dokud neni nula
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skpskp: add edx,2 ;dalsi hodnota v tabulce
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mov _zoom[offset tzoom.ytable],edx ;uloaz na puvodni misto
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sub edi,_zoom[offset tzoom.linelen] ;odecti tolik, kolik odpovida lince na obrazovce
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sub ecx,10000h ;sniz horni pulku ecx o jedna
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jnz skzp3 ;opakuj dokud neni nula
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ret
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public zooming32_
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zooming32_:
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;esi - zdrojovy blok
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;edi - cil
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;zoom.xtable - tabulka pro x
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;zoom.xtable - tabulka pro y
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;zoom.textline - rozdil mezi pravym okrajem a levym okrajem
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; pri prechodu na novou radku
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;ecx ysize:xsize
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push ebp
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mov bp,cx
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mov ebx,_zoom[offset tzoom.ytable]
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z32d: mov cx,bp
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mov edx,_zoom[offset tzoom.xtable]
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push esi
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z32c: mov al,[edx]
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inc edx
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or al,al
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jz z32a
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lodsw
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stosw
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stosw
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jmp z32b
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z32a: movsd
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z32b: dec cx
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jnz z32c
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pop esi
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mov eax,[ebx]
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and eax,0ffffh
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add esi,eax
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add ebx,2
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add edi,_zoom[offset tzoom.textline]
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xor cx,cx
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sub ecx,10000h
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jnz z32d
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pop ebp
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ret
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public zooming_lo_
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zooming_lo_:
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;esi - zdrojovy blok
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;edi - cil
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;zoom.xtable - tabulka pro x
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;zoom.xtable - tabulka pro y
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;zoom.textline - rozdil mezi pravym okrajem a levym okrajem
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; pri prechodu na novou radku
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;ecx ysize:xsize
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;ebx xlat
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push ebp
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mov bp,cx
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zlod: mov cx,bp
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mov edx,_zoom[offset tzoom.xtable]
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push esi
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zloc: xor eax,eax
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mov al,[edx]
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inc edx
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or al,al
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jz zloa
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lodsw
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mov eax,[ebx+eax*2]
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stosb
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jmp zlob
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zloa: lodsw
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mov eax,[ebx+eax*2]
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stosb
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add esi,2
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zlob: dec cx
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jnz zloc
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pop esi
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mov edx,_zoom[offset tzoom.ytable]
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mov eax,[edx]
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shl eax,1
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and eax,0ffffh
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add esi,eax
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add edx,2
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mov _zoom[offset tzoom.ytable],edx
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add edi,_zoom[offset tzoom.textline]
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xor cx,cx
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sub ecx,20000h
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jnz zlod
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pop ebp
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ret
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public zooming256_
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zooming256_:
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;esi - zdrojovy blok
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;edi - cil
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;zoom.xtable - tabulka pro x
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;zoom.xtable - tabulka pro y
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;zoom.textline - rozdil mezi pravym okrajem a levym okrajem
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; pri prechodu na novou radku
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;ecx ysize:xsize
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;ebx xlat
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push ebp
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mov bp,cx
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z256d: mov cx,bp
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mov edx,_zoom[offset tzoom.xtable]
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push esi
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z256c: xor eax,eax
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mov al,[edx]
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inc edx
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or al,al
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jz z256a
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lodsw
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mov eax,[ebx+eax*2]
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stosb
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stosb
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jmp z256b
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z256a: lodsw
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mov eax,[ebx+eax*2]
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stosb
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xor eax,eax
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lodsw
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mov eax,[ebx+eax*2]
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stosb
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z256b: dec cx
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jnz z256c
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pop esi
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mov edx,_zoom[offset tzoom.ytable]
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mov eax,[edx]
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and eax,0ffffh
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add esi,eax
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add edx,2
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mov _zoom[offset tzoom.ytable],edx
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add edi,_zoom[offset tzoom.textline]
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xor cx,cx
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sub ecx,10000h
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jnz z256d
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pop ebp
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ret
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; public scroll_left_
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;scroll_left_: ;edi - kam
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; ;lbuffer - obrazovka
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; ;zoom.startptr - novy obsah obrazovky
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; ;ebx - xlat
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; ;eax - o_kolik
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; mov bx,ax ;horni pulka ebx vi o kolik se posunuje vlevo
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; rol ebx,16
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; mov edx,640 ;dolni pulka ebx vi, jak velky blok je presouvan
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; sub edx,eax
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; sub edx,2
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; mov bx,dx
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; mov esi,edi ;vypocet esi
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; shl eax,1 ;esi = edi + 2 * o_kolik;
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; add esi,eax
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; mov edx,360 ;napln citac edx cislem udavajici pocet radku
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; add edi,_lbuffer ;k edi na zacatku pricti hodnotu _lbuffer
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; mov eax,esi ;uchovej esi v eax, behem prenosu bude modifikovan
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;scrl1: add esi,_lbuffer ;pricti k esi zacatek obrazovky
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; xor ecx,ecx ;vynuluj ecx
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; mov cx,bx ;do ecx naladuj delku bloku
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; shr ecx,1 ;presun 32-bit
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; rep movsd
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; adc ecx,1
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;; rep movsw
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; mov esi,_zoom ;vem ukazatel na novy obsah
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; mov ecx,ebx ;vezmi horni pulku EBx
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; shr ecx,16 ;to je hodnota, kolik se ma v prava doplnit
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; shr ecx,1 ;presun 32-bit
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; rep movsd
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; adc ecx,1
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; rep movsw
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; add _zoom,640*2 ;dalsi radka
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;; add eax,640*2 ;dalsi radka
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; mov esi,eax
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; dec edx ;dokud neni konec
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; jnz scrl1
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; ret
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;
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public scroll_support_32_
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scroll_support_32_:
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;edi - lbuffer + pozice na obrazovce
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;esi - oldbuffer
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;edx - newbuffer
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;ebx - xlat
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;ecx - size;
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push ebp ;uchovej ebp
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mov ebp,360 ;ebp pro tuto chvili predstavuje citac
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mov eax,ecx ;uchovej ecx jeste v eac - zachova citac sloupcu
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scrl1: push esi ;uchovej esi
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shr ecx,1 ;presun ecx bloku
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rep movsd
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rcl ecx,1
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rep movsw
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mov ecx,640 ;dopocitej ecx do 640
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sub ecx,eax
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pop esi ;obnov esi
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xchg esi,edx ;esi je nyni novy blok
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push esi ;uchovek esi
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shr ecx,1 ;presun
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rep movsd
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rcl ecx,1
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rep movsw
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pop esi ;obnov esi
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xchg esi,edx ;vrat edx a esi do puvodniho stavu
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mov ecx,eax ;obnov zase ecx z eax
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add esi,1280 ;dalsi radek
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add edx,1280
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dec ebp ; dokud nejsme na konci
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jnz scrl1 ;opakuj
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pop ebp
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ret
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public scroll_support_256_
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scroll_support_256_:
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;edi - lbuffer + pozice na obrazovce
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;esi - oldbuffer
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;edx - newbuffer
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;ebx - xlat
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;ecx - size;
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push ebp ;uchovej ebp
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mov ebp,360 ;ebp pro tuto chvili predstavuje citac
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scrl1a: push ecx ;uchovej ecx jeste v eac - zachova citac sloupcu
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push esi ;uchovej esi
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xor eax,eax
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scrl2a: lodsw
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mov al,[ebx+2*eax]
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xor ebx,1
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stosb
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dec ecx
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jnz scrl2a
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pop esi
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xchg esi,edx ;esi je nyni novy blok
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pop eax
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mov ecx,640 ;dopocitej ecx do 640
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sub ecx,eax
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push eax
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push esi ;uchovek esi
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xor eax,eax
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scrl3a: lodsw
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mov al,[ebx+2*eax]
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xor ebx,1
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stosb
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dec ecx
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jnz scrl3a
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pop esi ;obnov esi
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xchg esi,edx ;vrat edx a esi do puvodniho stavu
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pop ecx ;obnov zase ecx z eax
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add esi,1280 ;dalsi radek
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add edx,1280
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xor ebx,1
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dec ebp ; dokud nejsme na konci
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jnz scrl1a ;opakuj
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pop ebp
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ret
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public fcdraw_ ;Kresli strop nebo podlahu podle draw_table
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;EDX - sourceTxt
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;EBX - TargerTxt - LineOfset
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; (Lineofs je pocet bajtu odpovidajici
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; souradnicim [0,184] pro podlahu nebo [0,0]
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; pro strop)
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;EAX - draw_table
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fcdraw_:mov esi,[eax]
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mov edi,esi
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add edi,ebx
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add esi,edx
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mov ecx,[eax+4]
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shr ecx,1
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rep movsd
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rcl ecx,1
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rep movsw
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mov ecx,[eax+8]
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add eax,12
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or ecx,ecx
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jnz fcdraw_
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ret
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_TEXT ends
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END
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