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CnC_Remastered_Collection/REDALERT/2TXTPRNT.ASM
PG-SteveT 03416d24e1 Initial Source Code commit 
Initial commit of original Tiberian Dawn and Red Alert source code converted to build as DLLs, and compatible with the release version of Command & Conquer Remastered.
2020-05-27 12:16:20 -07:00

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;
; Copyright 2020 Electronic Arts Inc.
;
; TiberianDawn.DLL and RedAlert.dll and corresponding source code 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 3 of the License, or (at your option) any later version.
; TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
; in the hope that it will be useful, but with permitted additional restrictions
; under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
; distributed with this program. You should have received a copy of the
; GNU General Public License along with permitted additional restrictions
; with this program. If not, see [https://github.com/electronicarts/CnC_Remastered_Collection]>.
;***************************************************************************
;** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S **
;***************************************************************************
;* *
;* Project Name : Westwood 32 bit Library *
;* *
;* File Name : TXTPRNT.ASM *
;* *
;* Programmer : Phil W. Gorrow *
;* *
;* Start Date : January 17, 1995 *
;* *
;* Last Update : January 17, 1995 [PWG] *
;* *
;*-------------------------------------------------------------------------*
;* Functions: *
;* MCGA_Print -- Assembly MCGA text print routine *
;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
IDEAL
P386
MODEL USE32 FLAT
;INCLUDE "mcgaprim.inc"
;INCLUDE ".\gbuffer.inc"
GLOBAL C Buffer_Print : NEAR
STRUC GraphicViewPort
GVPOffset DD ? ; offset to virtual viewport
GVPWidth DD ? ; width of virtual viewport
GVPHeight DD ? ; height of virtual viewport
GVPXAdd DD ? ; x mod to get to next line
GVPXPos DD ? ; x pos relative to Graphic Buff
GVPYPos DD ? ; y pos relative to Graphic Buff
GVPPitch dd ? ; modulo of graphic view port
GVPBuffPtr DD ? ; ptr to associated Graphic Buff
ENDS
;*=========================================================================*
;* Extern the font pointer which is defined by the font class *
;*=========================================================================*
GLOBAL C FontPtr:DWORD
GLOBAL C FontXSpacing:DWORD
GLOBAL C FontYSpacing:DWORD
GLOBAL C ColorXlat:BYTE
;*=========================================================================*
;* Define the necessary equates for structures and bounds checking *
;*=========================================================================*
; The header of the font file looks like this:
; UWORD FontLength; 0
; BYTE FontCompress; 2
; BYTE FontDataBlocks; 3
; UWORD InfoBlockOffset; 4
; UWORD OffsetBlockOffset; 6
; UWORD WidthBlockOffset; 8
; UWORD DataBlockOffset; 10
; UWORD HeightOffset; 12
; For this reason the following equates have these values:
FONTINFOBLOCK EQU 4
FONTOFFSETBLOCK EQU 6
FONTWIDTHBLOCK EQU 8
FONTDATABLOCK EQU 10
FONTHEIGHTBLOCK EQU 12
FONTINFOMAXHEIGHT EQU 4
FONTINFOMAXWIDTH EQU 5
LOCALS ??
;*=========================================================================*
;* Define the color xlate table in the data segment *
;*=========================================================================*
DATASEG
ColorXlat DB 000H,001H,002H,003H,004H,005H,006H,007H
DB 008H,009H,00AH,00BH,00CH,00DH,00EH,00FH
DB 001H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 002H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 003H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 004H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 005H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 006H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 007H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 008H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 009H,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 00AH,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 00BH,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 00CH,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 00DH,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 00EH,000H,000H,000H,000H,000H,000H,000H
DB 000H,000H,000H,000H,000H,000H,000H,000H
DB 00FH
CODESEG
;***************************************************************************
;* MCGA_PRINT -- Assembly MCGA text print routine *
;* *
;* *
;* *
;* INPUT: *
;* *
;* OUTPUT: *
;* *
;* PROTO: *
;* *
;* WARNINGS: *
;* *
;* HISTORY: *
;* 01/17/1995 PWG : Created. *
;*=========================================================================*
PROC Buffer_Print C near
USES ebx,ecx,edx,esi,edi
ARG this:DWORD
ARG string:DWORD
ARG x_pixel:DWORD
ARG y_pixel:DWORD
ARG fcolor:DWORD
ARG bcolor:DWORD
LOCAL infoblock:DWORD ; pointer to info block
LOCAL offsetblock:DWORD ; pointer to offset block (UWORD *)
LOCAL widthblock:DWORD ; pointer to width block (BYTE *)
LOCAL heightblock:DWORD ; pointer to height block (UWORD *)
LOCAL curline:DWORD ; pointer to first column of current row.
LOCAL bufferwidth:DWORD ; width of buffer (vpwidth + Xadd)
LOCAL nextdraw:DWORD ; bufferwidth - width of cur character.
LOCAL startdraw:DWORD ; where next character will start being drawn.
LOCAL char:DWORD ; current character value.
LOCAL maxheight:BYTE ; max height of characters in font.
LOCAL bottomblank:BYTE ; amount of empty space below current character.
LOCAL charheight:BYTE ; true height of current character.
LOCAL vpwidth:DWORD
LOCAL vpheight:DWORD
LOCAL original_x:DWORD ; Starting X position.
;-------------------------------- Where to draw -----------------------------------------------
; Set up memory location to start drawing.
mov ebx,[this] ; get a pointer to dest
mov eax,[(GraphicViewPort ebx).GVPHeight] ; get height of viewport
mov [vpheight],eax ; save off height of viewport
mov eax,[(GraphicViewPort ebx).GVPWidth] ; get width of viewport
mov [vpwidth],eax ; save it off for later
add eax,[(GraphicViewPort ebx).GVPXAdd] ; add in xadd for bytes_per_line
add eax,[(GraphicViewPort ebx).GVPPitch] ; add in pitch of direct draw surface
mov [bufferwidth],eax ; save it off for later use.
mul [y_pixel] ; multiply rowsize * y_pixel start.
mov edi,[(GraphicViewPort ebx).GVPOffset] ; get start of the viewport
add edi,eax ; add y position to start of vp
mov [curline],edi ; save 0,y address for line feed stuff.
add edi,[x_pixel] ; add to get starting column in starting row.
mov [startdraw],edi ; save it off.
mov eax,[x_pixel]
mov [original_x],eax
;-------------------------------- Create block pointers ----------------------------------------
; Get the pointer to the font.
; We could check for NULL but why waste the time.
; It is up to programmer to make sure it is set.
mov esi,[FontPtr] ; Get the font pointer
or esi,esi
jz ??overflow
; Set up some pointers to the different memory blocks.
; esi (FontPtr) is added to each to get the true address of each block.
; Many registers are used for P5 optimizations.
; ebx is used for InfoBlock which is then used in the next section.
movzx eax,[WORD PTR esi+FONTOFFSETBLOCK] ; get offset to offset block
movzx ebx,[WORD PTR esi+FONTINFOBLOCK] ; get offset to info block (must be ebx for height test)
movzx ecx,[WORD PTR esi+FONTWIDTHBLOCK] ; get offset to width block
movzx edx,[WORD PTR esi+FONTHEIGHTBLOCK] ; get offset to height block
add eax,esi ; add offset of FontPtr to offset block
add ebx,esi ; add offset of FontPtr to info block
add ecx,esi ; add offset of FontPtr to width block
add edx,esi ; add offset of FontPtr to height block
mov [offsetblock],eax ; save offset to offset block
mov [infoblock],ebx ; save offset to info block
mov [widthblock],ecx ; save offset to width block
mov [heightblock],edx ; save offset to height block
;------------------------------------------ Test for fit ----------------------------------------------
; Test to make sure the height of the max character will fit on this line
; and and not fall out of the viewport.
; remember we set ebx to FONTINFOBLOCK above.
movzx eax,[BYTE PTR ebx + FONTINFOMAXHEIGHT]; get the max height in font.
mov [maxheight],al ; save it for later use.
add eax,[y_pixel] ; add current y_value.
cmp eax,[vpheight] ; are we over the edge?
jg ??overflow ; if so, we're outa here.
mov [y_pixel],eax ; save for next line feed. y value for next line.
cld ; Make sure we are always forward copying.
;------------------------ Set palette foreground and background ----------------------------------
mov eax,[fcolor] ; foreground color
mov [ColorXlat+1],al
mov [ColorXlat+16],al
mov eax,[bcolor] ; background color
mov [ColorXlat],al
;-------------------------------------------------------------------------------------------------
;----------------------------------------- Main loop ----------------------------------------------
; Now we go into the main loop of reading each character in the string and doing
; something with it.
??next_char:
; while (*string++)
xor eax,eax ; zero out since we will just load al.
mov esi,[string] ; get address on next character.
lodsb ; load the character into al.
test eax,0FFH ; test to see if character is a NULL
jz ??done ; character is NULL, get outa here.
mov edi,[startdraw] ; Load the starting address.
mov [string],esi ; save index into string. (incremented by lodsb)
cmp al,10 ; is the character a line feed?
je ??line_feed ; if so, go to special case.
cmp al,13 ; is the character a line feed?
je ??line_feed ; if so, go to special case.
mov [char],eax ; save the character off for later reference.
mov ebx,eax ; save it in ebx for later use also.
add eax,[widthblock] ; figure address of width of character.
mov ecx,[x_pixel] ; get current x_pixel.
movzx edx,[BYTE PTR eax] ; get the width of the character in dl.
add ecx,edx ; add width of char to current x_pixel.
mov eax,[FontXSpacing]
add ecx,eax
add [startdraw],edx ; save start draw for next character.
add [startdraw],eax ; adjust for the font spacing value
cmp ecx,[vpwidth] ; is the pixel greater then the vp width?
jg ??force_line_feed ; if so, force a line feed.
mov [x_pixel],ecx ; save value of start of next character.
mov ecx,[bufferwidth] ; get amount to next y same x (one row down)
sub ecx,edx ; take the current width off.
mov [nextdraw],ecx ; save it to add to edi when done with a row.
; At this point we got the character. It is now time to find out specifics
; about drawing the darn thing.
; ebx = char so they can be used as an indexes.
; edx = width of character for loop later.
; get offset of data for character into esi.
shl ebx,1 ; mult by 2 to later use as a WORD index.
mov esi,[offsetblock] ; get pointer to begining of offset block.
add esi,ebx ; index into offset block.
movzx esi,[WORD PTR esi] ; get true offset into data block from FontPtr.
add esi,[FontPtr] ; Now add FontPtr address to get true address.
; Get top and bottom blank sizes and the true height of the character.
add ebx,[heightblock] ; point ebx to element in height array.
mov al,[ebx+1] ; load the data height into dl.
mov cl,[ebx] ; load the first data row into cl.
mov bl,[maxheight] ; get the max height of characters.
mov [charheight],al ; get number of rows with data.
add al,cl ; add the two heights.
sub bl,al ; subract topblank + char height from maxheight.
mov [bottomblank],bl ; save off the number of blank rows on the bottom.
; leaving this section:
; dl is still the width of the character.
; cl is the height of the top blank area.
mov ebx,OFFSET ColorXlat ; setup ebx for xlat commands.
mov dh,dl ; save the width of the character to restore each loop.
cmp cl,0 ; is there any blank rows on top?
jz ??draw_char ; if not go and draw the real character.
xor eax,eax ; get color 0 for background.
xlat [ebx] ; get translated color into al
test al,al ; is it transparent black
jnz ??loop_top ; if not go and write the color
;----------------------------------------- skip Top blank area ----------------------------------------
; this case, the top is transparrent, but we need to increase our dest pointer to correct row.
movzx eax,cl ; get number of rows into eax;
mov ecx,edx ; save width since edx will be destroyed by mul.
mul [bufferwidth] ; multiply that by the width of the buffer.
mov edx,ecx ; restore the width
add edi,eax ; update the pointer.
jmp short ??draw_char ; now go draw the character.
;----------------------------------------- fill Top blank area ----------------------------------------
; edi was set a long time ago.
; al is the translated color
??loop_top:
stosb ; store the value
dec dh ; decrement our width.
jnz ??loop_top ; if more width, continue on.
add edi,[nextdraw] ; add amount for entire row.
dec cl ; decrement or row count
mov dh,dl ; restore width in dh for loop.
jz ??draw_char ; we are done here, go draw the character.
jmp short ??loop_top ; go back to top of loop.
;----------------------------------------- Draw character ----------------------------------------------
??draw_char:
movzx ecx,[charheight] ; get the height of character to count down rows.
test ecx,ecx ; is there any data? (blank would not have any)
jz ??next_char ; if no data, go on to next character.
??while_data:
lodsb ; get byte value from font data
mov ah,al ; save hinibble
and eax,0F00FH ; mask of low nibble in al hi nibble in ah.
xlat [ebx] ; get new color
test al,al ; is it a transparent?
jz short ??skiplo ; skip over write
mov [es:edi],al ; write it out
??skiplo:
inc edi
dec dh ; decrement our width.
jz short ??nextrow ; check if done with width of char
mov al,ah ; restore to get
; test the time difference between looking up in a large table when shr al,4 is not done as
; compared to using only a 16 byte table when using the shr al,4
;shr al,4 ; shift the hi nibble down to low nibble
xlat [ebx] ; get new color
test al,al ; is it a transparent?
jz short ??skiphi ; skip over write
mov [es:edi],al ; write it out
??skiphi:
inc edi
dec dh ; decrement our width.
jnz short ??while_data ; check if done with width of char
??nextrow:
add edi,[nextdraw] ; go to next line.
dec ecx ; decrement the number of rows to go
mov dh,dl ; restore our column count for row.
jnz ??while_data ; more data for character.
; Now it is time to setup for clearing out the bottom of the character.
movzx ecx,[bottomblank] ; get amount on bottom that is blank
cmp ecx,0 ; if there is no blank bottom...
jz ??next_char ; then skip to go to next character
xor eax,eax ; get color 0 for background.
xlat [ebx] ; get translated color into al
test al,al ; is it transparent black
jz ??next_char ; skip the top black section to let the background through
mov dh,dl ; restore width in dh for loop.
;----------------------------------------- Blank below character -----------------------------------
??loop_bottom:
stosb ; store the value
dec dh ; decrement our width.
jnz ??loop_bottom ; if more width, continue on.
add edi,[nextdraw] ; add amount for entire row.
mov dh,dl ; restore width in dh for loop.
dec cl ; decrement or row count
jz ??next_char ; we are done here, go to the next character.
jmp short ??loop_bottom ; go back to top of loop.
;----------------------------------- end of next_char (main) loop ------------------------------------
;-------------------------------------------------------------------------------------------------
;----------------------------------- special case line feeds ----------------------------------------
??force_line_feed:
; decrement pointer *string so that it will be back at same character
; when it goes through the loop.
mov eax,[string] ; get string pointer.
dec eax ; decrement it to point to previos char
mov [string],eax ; save it back off.
xor eax,eax
; Now go into the line feed code.....
??line_feed:
mov bl,al
mov edx,[y_pixel] ; get the current y pixel value.
movzx ecx,[maxheight] ; get max height for later use.
add ecx,[FontYSpacing]
add edx,ecx ; add max height to y_pixel
cmp edx,[vpheight] ; are we over the edge?
jg ??overflow ; if so, we are outa here.
mov eax,[bufferwidth] ; get bytes to next line.
mov edi,[curline] ; get start of current line.
mul ecx ; mult max height * next line.
add edi,eax ; add adjustment to current line.
add [y_pixel],ecx ; increment to our next y position.
;;; DRD
mov [curline],edi ; save it off for next line_feed.
; Move the cursor to either the left edge of the screen
; or the left margin of the print position depending
; on whether <CR> or <LF> was specified. <CR> = left margin
; <LF> = left edge of screen
xor eax,eax
cmp bl,10
je ??lfeed
mov eax,[original_x]
??lfeed:
mov [x_pixel],eax ; zero out x_pixel
add edi,eax
;;; DRD mov [curline],edi ; save it off for next line_feed.
mov [startdraw],edi ; save it off so we know where to draw next char.w
jmp ??next_char
??overflow:
mov [startdraw],0 ; Indicate that there is no valid next pos.
??done:
mov eax,[startdraw] ; return this so calling routine
ret ; can figure out where to draw next.
ENDP Buffer_Print
;***************************************************************************
;* GET_FONT_PALETTE_PTR -- Returns a pointer to the 256 byte font palette *
;* *
;* INPUT: none *
;* *
;* OUTPUT: none *
;* *
;* PROTO: void *Get_Font_Palette_Ptr(void); *
;* *
;* HISTORY: *
;* 08/18/1995 PWG : Created. *
;*=========================================================================*
GLOBAL C Get_Font_Palette_Ptr:NEAR
PROC Get_Font_Palette_Ptr C near
mov eax, OFFSET ColorXlat
ret
ENDP Get_Font_Palette_Ptr
END
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