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id_vw_ac.asm
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id_vw_ac.asm
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; Keen Dreams Source Code
; Copyright (C) 2014 Javier M. Chavez
;
; 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.
;=================================
;
; CGA view manager routines
;
;=================================
;============================================================================
;
; All of these routines draw into a floating virtual screen segment in main
; memory. bufferofs points to the origin of the drawing page in screenseg.
; The routines that write out words must take into account buffer wrapping
; and not write a word at 0xffff (which causes an exception on 386s).
;
; The direction flag should be clear
;
;============================================================================
DATASEG
plotpixels db 0c0h,030h,0ch,03h
colorbyte db 000000b,01010101b,10101010b,11111111b
colorword dw 0,5555h,0aaaah,0ffffh
CODESEG
;============================================================================
;
; VW_Plot (int x,y,color)
;
;============================================================================
PROC VW_Plot x:WORD, y:WORD, color:WORD
PUBLIC VW_Plot
USES SI,DI
mov es,[screenseg]
mov di,[bufferofs]
mov bx,[y]
shl bx,1
add di,[ylookup+bx]
mov bx,[x]
mov ax,bx
shr ax,1
shr ax,1
add di,ax ; di = byte on screen
and bx,3
mov ah,[plotpixels+bx]
mov bx,[color]
mov cl,[colorbyte+bx]
and cl,ah
not ah
mov al,[es:di]
and al,ah ; mask off other pixels
or al,cl
stosb
ret
ENDP
;============================================================================
;
; VW_Vlin (int yl,yh,x,color)
;
;============================================================================
PROC VW_Vlin yl:WORD, yh:WORD, x:WORD, color:WORD
PUBLIC VW_Vlin
USES SI,DI
mov es,[screenseg]
mov di,[bufferofs]
mov bx,[yl]
shl bx,1
add di,[ylookup+bx]
mov bx,[x]
mov ax,bx
shr ax,1
shr ax,1
add di,ax ; di = byte on screen
and bx,3
mov ah,[plotpixels+bx]
mov bx,[color]
mov bl,[colorbyte+bx]
and bl,ah
not ah
mov cx,[yh]
sub cx,[yl]
inc cx ;number of pixels to plot
mov dx,[linewidth]
@@plot:
mov al,[es:di]
and al,ah ; mask off other pixels
or al,bl
mov [es:di],al
add di,dx
loop @@plot
ret
ret
ENDP
;============================================================================
;===================
;
; VW_DrawTile8
;
; xcoord in bytes (8 pixels), ycoord in pixels
; All Tile8s are in one grseg, so an offset is calculated inside it
;
; DONE
;
;===================
PROC VW_DrawTile8 xcoord:WORD, ycoord:WORD, tile:WORD
PUBLIC VW_DrawTile8
USES SI,DI
mov es,[screenseg]
mov di,[bufferofs]
add di,[xcoord]
mov bx,[ycoord]
shl bx,1
add di,[ylookup+bx]
mov bx,[linewidth]
sub bx,2
mov si,[tile]
shl si,1
shl si,1
shl si,1
shl si,1
mov ds,[grsegs+STARTTILE8*2] ; segment for all tile8s
;
; start drawing
;
REPT 7
movsb ;no word moves because of segment wrapping
movsb
add di,bx
ENDM
movsb
movsb
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
ENDP
;============================================================================
;
; VW_MaskBlock
;
; Draws a masked block shape to the screen. bufferofs is NOT accounted for.
; The mask comes first, then the data. Seperate unwound routines are used
; to speed drawing.
;
; Mask blocks will allways be an even width because of the way IGRAB works
;
; DONE
;
;============================================================================
DATASEG
UNWOUNDMASKS = 18
maskroutines dw mask0,mask0,mask2E,mask2O,mask4E,mask4O
dw mask6E,mask6O,mask8E,mask8O,mask10E,mask10O
dw mask12E,mask12O,mask14E,mask14O,mask16E,mask16O
dw mask18E,mask18O
routinetouse dw ?
CODESEG
PROC VW_MaskBlock segm:WORD, ofs:WORD, dest:WORD, wide:WORD, height:WORD, planesize:WORD
PUBLIC VW_MaskBlock
USES SI,DI
mov es,[screenseg]
mov di,[wide]
mov dx,[linewidth]
sub dx,di ;dx = delta to start of next line
mov bx,[planesize] ; si+bx = data location
cmp di,UNWOUNDMASKS
jbe @@unwoundroutine
;==============
;
; General purpose masked block drawing. This could be optimised into
; four routines to use words, but few play loop sprites should be this big!
;
;==============
mov [ss:linedelta],dx
mov ds,[segm]
mov si,[ofs]
mov di,[dest]
mov dx,[height] ;scan lines to draw
@@lineloopgen:
mov cx,[wide]
@@byteloop:
mov al,[es:di]
and al,[si]
or al,[bx+si]
inc si
stosb
loop @@byteloop
add di,[ss:linedelta]
dec dx
jnz @@lineloopgen
mask0:
mov ax,ss
mov ds,ax
ret ;width of 0 = no drawing
;=================
;
; use the unwound routines
;
;=================
@@unwoundroutine:
shr di,1 ;we only have even width unwound routines
mov cx,[dest]
shr cx,1
rcl di,1 ;shift a 1 in if destination is odd
shl di,1
mov ax,[maskroutines+di] ;call the right routine
mov ds,[segm]
mov si,[ofs]
mov di,[dest]
mov cx,[height] ;scan lines to draw
jmp ax ;draw it
;=================
;
; Horizontally unwound routines to draw certain masked blocks faster
;
;=================
MACRO MASKBYTE
mov al,[es:di]
and al,[si]
or al,[bx+si]
inc si
stosb
ENDM
MACRO MASKWORD
mov ax,[es:di]
and ax,[si]
or ax,[bx+si]
inc si
inc si
stosw
ENDM
MACRO SPRITELOOP addr
add di,dx
loop addr
mov ax,ss
mov ds,ax
ret
ENDM
EVEN
mask2E:
MASKWORD
SPRITELOOP mask2E
EVEN
mask2O:
MASKBYTE
MASKBYTE
SPRITELOOP mask2O
EVEN
mask4E:
MASKWORD
MASKWORD
SPRITELOOP mask4E
EVEN
mask4O:
MASKBYTE
MASKWORD
MASKBYTE
SPRITELOOP mask4O
EVEN
mask6E:
MASKWORD
MASKWORD
MASKWORD
SPRITELOOP mask6E
EVEN
mask6O:
MASKBYTE
MASKWORD
MASKWORD
MASKBYTE
SPRITELOOP mask6O
EVEN
mask8E:
MASKWORD
MASKWORD
MASKWORD
MASKWORD
SPRITELOOP mask8E
EVEN
mask8O:
MASKBYTE
MASKWORD
MASKWORD
MASKWORD
MASKBYTE
SPRITELOOP mask8O
EVEN
mask10E:
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
SPRITELOOP mask10E
EVEN
mask10O:
MASKBYTE
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKBYTE
SPRITELOOP mask10O
EVEN
mask12E:
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
SPRITELOOP mask12E
EVEN
mask12O:
MASKBYTE
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKBYTE
SPRITELOOP mask12O
EVEN
mask14E:
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
SPRITELOOP mask14E
EVEN
mask14O:
MASKBYTE
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKBYTE
SPRITELOOP mask14O
EVEN
mask16E:
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
SPRITELOOP mask16E
EVEN
mask16O:
MASKBYTE
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKBYTE
SPRITELOOP mask16O
EVEN
mask18E:
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
SPRITELOOP mask18E
EVEN
mask18O:
MASKBYTE
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKWORD
MASKBYTE
SPRITELOOP mask18O
ENDP
;============================================================================
;
; VW_ScreenToScreen
;
; Basic block copy routine. Copies one block of screen memory to another,
; bufferofs is NOT accounted for.
;
; DONE
;
;============================================================================
PROC VW_ScreenToScreen source:WORD, dest:WORD, wide:WORD, height:WORD
PUBLIC VW_ScreenToScreen
USES SI,DI
mov bx,[linewidth]
sub bx,[wide]
mov ax,[screenseg]
mov es,ax
mov ds,ax
mov si,[source]
mov di,[dest] ;start at same place in all planes
mov dx,[height] ;scan lines to draw
mov ax,[wide]
;
; if the width, source, and dest are all even, use word moves
; This is allways the case in the CGA refresh
;
test ax,1
jnz @@bytelineloop
test si,1
jnz @@bytelineloop
test di,1
jnz @@bytelineloop
shr ax,1
@@wordlineloop:
mov cx,ax
rep movsw
add si,bx
add di,bx
dec dx
jnz @@wordlineloop
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
@@bytelineloop:
mov cx,ax
rep movsb
add si,bx
add di,bx
dec dx
jnz @@bytelineloop
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
ENDP
;============================================================================
;
; VW_MemToScreen
;
; Basic block drawing routine. Takes a block shape at segment pointer source
; of width by height data, and draws it to dest in the virtual screen,
; based on linewidth. bufferofs is NOT accounted for.
; There are four drawing routines to provide the best optimized code while
; accounting for odd segment wrappings due to the floating screens.
;
; DONE
;
;============================================================================
DATASEG
memtoscreentable dw eventoeven,eventoodd,oddtoeven,oddtoodd
CODESEG
PROC VW_MemToScreen source:WORD, dest:WORD, wide:WORD, height:WORD
PUBLIC VW_MemToScreen
USES SI,DI
mov es,[screenseg]
mov bx,[linewidth]
sub bx,[wide]
mov ds,[source]
xor si,si ;block is segment aligned
xor di,di
shr [wide],1 ;change wide to words, and see if carry is set
rcl di,1 ;1 if wide is odd
mov ax,[dest]
shr ax,1
rcl di,1 ;shift a 1 in if destination is odd
shl di,1 ;to index into a word width table
mov dx,[height] ;scan lines to draw
mov ax,[wide]
jmp [ss:memtoscreentable+di] ;call the right routine
;==============
;
; Copy an even width block to an even destination address
;
;==============
eventoeven:
mov di,[dest] ;start at same place in all planes
EVEN
@@lineloopEE:
mov cx,ax
rep movsw
add di,bx
dec dx
jnz @@lineloopEE
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
;==============
;
; Copy an odd width block to an even video address
;
;==============
oddtoeven:
mov di,[dest] ;start at same place in all planes
EVEN
@@lineloopOE:
mov cx,ax
rep movsw
movsb ;copy the last byte
add di,bx
dec dx
jnz @@lineloopOE
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
;==============
;
; Copy an even width block to an odd video address
;
;==============
eventoodd:
mov di,[dest] ;start at same place in all planes
dec ax ;one word has to be handled seperately
EVEN
@@lineloopEO:
movsb
mov cx,ax
rep movsw
movsb
add di,bx
dec dx
jnz @@lineloopEO
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
;==============
;
; Copy an odd width block to an odd video address
;
;==============
oddtoodd:
mov di,[dest] ;start at same place in all planes
EVEN
@@lineloopOO:
movsb
mov cx,ax
rep movsw
add di,bx
dec dx
jnz @@lineloopOO
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
ENDP
;===========================================================================
;
; VW_ScreenToMem
;
; Copies a block of video memory to main memory, in order from planes 0-3.
; This could be optimized along the lines of VW_MemToScreen to take advantage
; of word copies, but this is an infrequently called routine.
;
; DONE
;
;===========================================================================
PROC VW_ScreenToMem source:WORD, dest:WORD, wide:WORD, height:WORD
PUBLIC VW_ScreenToMem
USES SI,DI
mov es,[dest]
mov bx,[linewidth]
sub bx,[wide]
mov ds,[screenseg]
xor di,di
mov si,[source]
mov dx,[height] ;scan lines to draw
@@lineloop:
mov cx,[wide]
rep movsb
add si,bx
dec dx
jnz @@lineloop
mov ax,ss
mov ds,ax ;restore turbo's data segment
ret
ENDP
;===========================================================================
;
; MISC CGA ROUTINES
;
;===========================================================================
;==============
;
; VW_SetScreen
;
; DONE
;
;==============
PROC VW_SetScreen crtc:WORD
PUBLIC VW_SetScreen
;
; for some reason, my XT's EGA card doesn't like word outs to the CRTC
; index...
;
cli
mov cx,[crtc]
mov dx,CRTC_INDEX
mov al,0ch ;start address high register
out dx,al
inc dx
mov al,ch
out dx,al
dec dx
mov al,0dh ;start address low register
out dx,al
mov al,cl
inc dx
out dx,al
sti
ret
ENDP
if NUMFONT+NUMFONTM
;===========================================================================
;
; GENERAL FONT DRAWING ROUTINES
;
;===========================================================================
DATASEG
px dw ? ; proportional character drawing coordinates
py dw ?
pdrawmode db 11000b ; 8 = OR, 24 = XOR, put in GC_DATAROTATE
fontcolor db 15 ;0-15 mapmask value
PUBLIC px,py,pdrawmode,fontcolor
;
; offsets in font structure
;
pcharheight = 0 ;lines high
charloc = 2 ;pointers to every character
charwidth = 514 ;every character's width in pixels
propchar dw ? ; the character number to shift
stringptr dw ?,?
fontcolormask dw ? ; font color expands into this
BUFFWIDTH = 100
BUFFHEIGHT = 32 ; must be twice as high as font for masked fonts
databuffer db BUFFWIDTH*BUFFHEIGHT dup (?)
bufferwidth dw ? ; bytes with valid info / line
bufferheight dw ? ; number of lines currently used
bufferbyte dw ?
bufferbit dw ?
PUBLIC bufferwidth,bufferheight,bufferbyte,bufferbit
screenspot dw ? ; where the buffer is going
bufferextra dw ? ; add at end of a line copy
screenextra dw ?
CODESEG
;======================
;
; Macros to table shift a byte of font
;
;======================
MACRO SHIFTNOXOR
mov al,[es:bx] ; source
xor ah,ah
shl ax,1
mov si,ax
mov ax,[bp+si] ; table shift into two bytes
or [di],al ; or with first byte
inc di
mov [di],ah ; replace next byte
inc bx ; next source byte
ENDM
MACRO SHIFTWITHXOR
mov al,[es:bx] ; source
xor ah,ah
shl ax,1
mov si,ax
mov ax,[bp+si] ; table shift into two bytes
not ax
and [di],al ; and with first byte
inc di
mov [di],ah ; replace next byte
inc bx ; next source byte
ENDM
;=======================
;
; VWL_XORBuffer
;
; Pass buffer start in SI (somewhere in databuffer)
; Draws the buffer to the screen buffer
;
;========================
PROC VWL_XORBuffer NEAR
USES BP
mov bl,[fontcolor]
xor bh,bh
shl bx,1
mov ax,[colorword+bx]
mov [fontcolormask],ax
mov es,[screenseg]
mov di,[screenspot]
mov bx,[bufferwidth] ;calculate offsets for end of each line
mov [bufferwidth],bx
or bx,bx
jnz @@isthere
ret ;nothing to draw
@@isthere:
test bx,1
jnz @@odd
jmp @@even
;
; clear the last byte so word draws can be used
;
@@odd:
mov al,0
line = 0
REPT BUFFHEIGHT
mov [BYTE databuffer+BUFFWIDTH*line+bx],al
line = line+1
ENDM
inc bx
@@even:
mov ax,[linewidth]
sub ax,bx
mov [screenextra],ax
mov ax,BUFFWIDTH
sub ax,bx
mov [bufferextra],ax
mov dx,bx
shr dx,1 ;word to copy
mov bx,[bufferheight] ;lines to copy
mov bp,[fontcolormask]
@@lineloop:
mov cx,dx
@@wordloop:
lodsw ;get a word from the buffer
and ax,bp
xor [es:di],ax ;draw it
add di,2
loop @@wordloop
add si,[bufferextra]
add di,[screenextra]
dec bx
jnz @@lineloop
ret
ENDP
DATASEG
;============================================================================
;
; NON MASKED FONT DRAWING ROUTINES
;
;============================================================================
if numfont
DATASEG
shiftdrawtable dw 0,shift1wide,shift2wide,shift3wide,shift4wide
dw shift5wide,shift6wide
CODESEG
;==================
;
; ShiftPropChar
;
; Call with BX = character number (0-255)
; Draws one character to the buffer at bufferbyte/bufferbit, and adjusts
; them to the new position
;
;==================
PROC ShiftPropChar NEAR
mov es,[grsegs+STARTFONT*2] ;segment of font to use
;
; find character location, width, and height
;
mov si,[es:charwidth+bx]
and si,0ffh ;SI hold width in pixels
shl bx,1
mov bx,[es:charloc+bx] ;BX holds pointer to character data
;
; look up which shift table to use, based on bufferbit
;
mov di,[bufferbit]
shl di,1
mov bp,[shifttabletable+di] ;BP holds pointer to shift table
mov di,OFFSET databuffer
add di,[bufferbyte] ;DI holds pointer to buffer
mov cx,[bufferbit]
add cx,si ;add twice because pixel == two bits
add cx,si ;new bit position
mov ax,cx
and ax,7
mov [bufferbit],ax ;new bit position
mov ax,cx
shr ax,1