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C3_SCA_A.ASM
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; Catacomb 3-D Source Code
; Copyright (C) 1993-2014 Flat Rock Software
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License along
; with this program; if not, write to the Free Software Foundation, Inc.,
; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
IDEAL
MODEL MEDIUM,C
include "ID_ASM.EQU"
;===========================================================================
;
; SCALING GRAPHICS
;
;===========================================================================
MACRO MAKELAB NUM
lab&NUM:
ENDM
MACRO MAKEREF NUM
dw OFFSET lab&NUM
ENDM
;=========================================================================
MAXSCALES equ 256
DATASEG
EXTRN screenseg:WORD
EXTRN linewidth:WORD
LABEL endtable WORD
labcount = 0
REPT MAXSCALES
MAKEREF %labcount
labcount = labcount + 1
ENDM
CODESEG
;==================================================
;
; void scaleline (int scale, unsigned picseg, unsigned maskseg,
; unsigned screen, unsigned width)
;
;==================================================
PROC ScaleLine pixels:word, scaleptr:dword, picptr:dword, screen:word
USES si,di
PUBLIC ScaleLine
;
; modify doline procedure for proper width
;
mov bx,[pixels]
cmp bx,MAXSCALES
jbe @@scaleok
mov bx,MAXSCALES
@@scaleok:
shl bx,1
mov bx,[endtable+bx]
push [cs:bx] ;save the code that will be modified over
mov [WORD cs:bx],0d18eh ;mov ss,cx
push [cs:bx+2] ;save the code that will be modified over
mov [WORD cs:bx+2],90c3h ;ret / nop
push bx
mov dx,[linewidth]
mov di,[WORD screen]
mov es,[screenseg]
mov si,[WORD scaleptr]
mov ds,[WORD scaleptr+2]
mov bx,[WORD picptr]
mov ax,[WORD picptr+2] ;will be moved into ss after call
mov bp,bx
cli
call doline
sti
;
; restore doline to regular state
;
pop bx ;address of modified code
pop [cs:bx+2]
pop [cs:bx]
mov ax,ss
mov ds,ax
ret
;================
;
; doline
;
; Big unwound scaling routine
;
; ds:si = scale table
; ss:bx = pic data
; es:di = screen location
;
;================
doline:
mov cx,ss
mov ss,ax ;can't call a routine with ss used...
labcount = 0
REPT MAXSCALES
MAKELAB %labcount
labcount = labcount + 1
lodsb ; get scaled pixel number
xlat [ss:bx] ; look it up in the picture
xchg [es:di],al ; load latches and write pixel to screen
add di,dx ; down to next line
ENDM
mov ss,cx
ret
ENDP
END