+++ /dev/null
-; Catacomb 3-D Source Code\r
-; Copyright (C) 1993-2014 Flat Rock Software\r
-;\r
-; This program is free software; you can redistribute it and/or modify\r
-; it under the terms of the GNU General Public License as published by\r
-; the Free Software Foundation; either version 2 of the License, or\r
-; (at your option) any later version.\r
-;\r
-; This program is distributed in the hope that it will be useful,\r
-; but WITHOUT ANY WARRANTY; without even the implied warranty of\r
-; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r
-; GNU General Public License for more details.\r
-;\r
-; You should have received a copy of the GNU General Public License along\r
-; with this program; if not, write to the Free Software Foundation, Inc.,\r
-; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.\r
-\r
-IDEAL\r
-\r
-MODEL MEDIUM,C\r
-\r
-VIEWWIDTH = (33*8)\r
-GC_INDEX = 03CEh\r
-\r
-DATASEG\r
-EVEN\r
-\r
-;=================== Tables filled in by DrawVWall ==========================\r
-\r
-;\r
-; wallheight has the height (scale number) of that collumn of scaled wall\r
-; it is pre bounded to 1-MAXSCALE (the actuial height on screen is 2*height)\r
-;\r
-wallheight dw VIEWWIDTH dup (?)\r
-\r
-;\r
-; wallwidth has the pixel width (1-7) of that collumn\r
-;\r
-wallwidth dw VIEWWIDTH dup (?)\r
-\r
-;\r
-; wallseg has the segment of the wall picture\r
-;\r
-wallseg dw VIEWWIDTH dup (?)\r
-\r
-;\r
-; wallofs has the offset of the wall picture\r
-;\r
-wallofs dw VIEWWIDTH dup (?)\r
-\r
-;============================================================================\r
-\r
-;\r
-; screenbyte is just position/8\r
-;\r
-LABEL screenbyte WORD\r
-pos = 0\r
-REPT VIEWWIDTH\r
- dw pos/8\r
-pos = pos+1\r
-ENDM\r
-\r
-;\r
-; screenbit is (position&7)*16\r
-;\r
-LABEL screenbit WORD\r
-pos = 0\r
-REPT VIEWWIDTH\r
- dw (pos AND 7)*16\r
-pos = pos+1\r
-ENDM\r
-\r
-;\r
-; Use offset: screenbit[]+pixwidth*2\r
-; acess from bitmasks-2+offset for one biased pixwidth\r
-; the low byte of bitmasks is for the first screen byte, the high byte\r
-; is the bitmask for the second screen byte (if non 0)\r
-;\r
-\r
-bitmasks dw 0080h,00c0h,00e0h,00f0h,00f8h,00fch,00feh,00ffh\r
- dw 0040h,0060h,0070h,0078h,007ch,007eh,007fh,807fh\r
- dw 0020h,0030h,0038h,003ch,003eh,003fh,803fh,0c03fh\r
- dw 0010h,0018h,001ch,001eh,001fh,801fh,0c01fh,0e01fh\r
- dw 0008h,000ch,000eh,000fh,800fh,0c00fh,0e00fh,0f00fh\r
- dw 0004h,0006h,0007h,8007h,0c007h,0e007h,0f007h,0f807h\r
- dw 0002h,0003h,8003h,0c003h,0e003h,0f003h,0f803h,0fc03h\r
- dw 0001h,8001h,0c001h,0e001h,0f001h,0f801h,0fc01h,0fe01h\r
-\r
-\r
-;\r
-; wallscalecall is a far pointer to the start of a compiled scaler\r
-; The low word will never change, while the high word is set to\r
-; compscaledirectory[scale]\r
-;\r
-wallscalecall dd (65*6) ; offset of t_compscale->code[0]\r
-\r
-\r
-PUBLIC wallheight,wallwidth,wallseg,wallofs,screenbyte,screenbit\r
-PUBLIC bitmasks,wallscalecall\r
-\r
-\r
-EXTRN scaledirectory:WORD ; array of MAXSCALE segment pointers to\r
- ; compiled scalers\r
-EXTRN screenseg:WORD ; basically just 0xa000\r
-EXTRN bufferofs:WORD ; offset of the current work screen\r
-\r
-CODESEG\r
-\r
-;============================================================================\r
-;\r
-; ScaleWalls\r
-;\r
-; AX AL is scratched in bit mask setting and scaling\r
-; BX table index\r
-; CX pixwidth*2\r
-; DX GC_INDEX\r
-; SI offset into wall data to scale from, allways 0,64,128,...4032\r
-; DI byte at top of screen that the collumn is contained in\r
-; BP x pixel * 2, index into VIEWWIDTH wide tables\r
-; DS segment of the wall data to texture map\r
-; ES screenseg\r
-; SS addressing DGROUP variables\r
-;\r
-;============================================================================\r
-\r
-PROC ScaleWalls\r
-PUBLIC ScaleWalls\r
-USES SI,DI,BP\r
-\r
- xor bp,bp ; start at location 0 in the tables\r
- mov dx,GC_INDEX+1\r
- mov es,[screenseg]\r
-\r
-;\r
-; scale one collumn of data, possibly across two bytes\r
-;\r
-nextcollumn:\r
-\r
- mov bx,[wallheight+bp] ; height of walls (1-MAXSCALE)\r
- shl bx,1\r
- mov ax,[ss:scaledirectory+bx] ; segment of the compiled scaler\r
- mov [WORD PTR ss:wallscalecall+2],ax\r
-\r
- mov cx,[wallwidth+bp]\r
- or cx,cx\r
- jnz okwidth\r
- mov cx,2\r
- jmp next\r
-\r
-okwidth:\r
- shl cx,1\r
- mov ds,[wallseg+bp]\r
- mov si,[wallofs+bp]\r
-\r
- mov di,[screenbyte+bp] ; byte at the top of the scaled collumn\r
- add di,[ss:bufferofs] ; offset of current page flip\r
- mov bx,[screenbit+bp] ; 0-7 << 4\r
- add bx,cx\r
- mov ax,[ss:bitmasks-2+bx]\r
- out dx,al ; set bit mask register\r
- call [DWORD PTR ss:wallscalecall] ; scale the line of pixels\r
- or ah,ah ; is there anything in the second byte?\r
- jnz secondbyte\r
-;\r
-; next\r
-;\r
-next:\r
- add bp,cx\r
- cmp bp,VIEWWIDTH*2\r
- jb nextcollumn\r
- jmp done\r
-\r
-;\r
-; draw a second byte for vertical strips that cross two bytes\r
-;\r
-secondbyte:\r
- mov al,ah\r
- inc di ; next byte over\r
- out dx,al ; set bit mask register\r
- call [DWORD PTR ss:wallscalecall] ; scale the line of pixels\r
-;\r
-; next\r
-;\r
- add bp,cx\r
- cmp bp,VIEWWIDTH*2\r
- jb nextcollumn\r
-\r
-done:\r
- mov ax,ss\r
- mov ds,ax\r
- ret\r
-\r
-ENDP\r
-\r
-\r
-END\r
-\r
projects / 16.git / blobdiff