668 lines
18 KiB
NASM
668 lines
18 KiB
NASM
;
|
||
; 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 A S S O C I A T E S *
|
||
; **************************************************************************
|
||
; * *
|
||
; * Project Name : WSA Support routines *
|
||
; * *
|
||
; * File Name : XORDELTA.ASM *
|
||
; * *
|
||
; * Programmer : Scott K. Bowen *
|
||
; * *
|
||
; * Last Update :May 23, 1994 [SKB] *
|
||
; * *
|
||
; *------------------------------------------------------------------------*
|
||
; * Functions: *
|
||
;* Apply_XOR_Delta -- Apply XOR delta data to a buffer. *
|
||
;* Apply_XOR_Delta_To_Page_Or_Viewport -- Calls the copy or the XOR funti*
|
||
;* Copy_Delta_buffer -- Copies XOR Delta Data to a section of a page. *
|
||
;* XOR_Delta_Buffer -- Xor's the data in a XOR Delta format to a page. *
|
||
; * - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*
|
||
|
||
;IDEAL
|
||
;P386
|
||
;MODEL USE32 FLAT
|
||
.model flat
|
||
|
||
|
||
|
||
;LOCALS ??
|
||
|
||
; These are used to call Apply_XOR_Delta_To_Page_Or_Viewport() to setup flags parameter. If
|
||
; These change, make sure and change their values in wsa.cpp.
|
||
DO_XOR equ 0
|
||
DO_COPY equ 1
|
||
TO_VIEWPORT equ 0
|
||
TO_PAGE equ 2
|
||
|
||
;
|
||
; Routines defined in this module
|
||
;
|
||
;
|
||
; UWORD Apply_XOR_Delta(UWORD page_seg, BYTE *delta_ptr);
|
||
; PUBLIC Apply_XOR_Delta_To_Page_Or_Viewport(UWORD page_seg, BYTE *delta_ptr, WORD width, WORD copy)
|
||
;
|
||
; PROC C XOR_Delta_Buffer
|
||
; PROC C Copy_Delta_Buffer
|
||
;
|
||
|
||
externdef C Apply_XOR_Delta:NEAR
|
||
externdef C Apply_XOR_Delta_To_Page_Or_Viewport:NEAR
|
||
|
||
|
||
|
||
;CODESEG
|
||
.code
|
||
|
||
|
||
;***************************************************************************
|
||
;* APPLY_XOR_DELTA -- Apply XOR delta data to a linear buffer. *
|
||
;* AN example of this in C is at the botton of the file commented out. *
|
||
;* *
|
||
;* INPUT: BYTE *target - destination buffer. *
|
||
;* BYTE *delta - xor data to be delta uncompress. *
|
||
;* *
|
||
;* OUTPUT: *
|
||
;* *
|
||
;* WARNINGS: *
|
||
;* *
|
||
;* HISTORY: *
|
||
;* 05/23/1994 SKB : Created. *
|
||
;*=========================================================================*
|
||
Apply_XOR_Delta proc C public USES ebx ecx edx esi edi target:DWORD, delta:DWORD
|
||
|
||
;USES ebx,ecx,edx,edi,esi
|
||
;ARG target:DWORD ; pointers.
|
||
;ARG delta:DWORD ; pointers.
|
||
|
||
; Optimized for 486/pentium by rearanging instructions.
|
||
mov edi,[target] ; get our pointers into offset registers.
|
||
mov esi,[delta]
|
||
|
||
cld ; make sure we go forward
|
||
xor ecx,ecx ; use cx for loop
|
||
|
||
top_loop:
|
||
xor eax,eax ; clear out eax.
|
||
mov al,[esi] ; get delta source byte
|
||
inc esi
|
||
|
||
test al,al ; check for a SHORTDUMP ; check al incase of sign value.
|
||
je short_run
|
||
js check_others
|
||
|
||
;
|
||
; SHORTDUMP
|
||
;
|
||
mov ecx,eax ; stick count in cx
|
||
|
||
dump_loop:
|
||
mov al,[esi] ;get delta XOR byte
|
||
xor [edi],al ; xor that byte on the dest
|
||
inc esi
|
||
inc edi
|
||
dec ecx
|
||
jnz dump_loop
|
||
jmp top_loop
|
||
|
||
;
|
||
; SHORTRUN
|
||
;
|
||
|
||
short_run:
|
||
mov cl,[esi] ; get count
|
||
inc esi ; inc delta source
|
||
|
||
do_run:
|
||
mov al,[esi] ; get XOR byte
|
||
inc esi
|
||
|
||
run_loop:
|
||
xor [edi],al ; xor that byte.
|
||
|
||
inc edi ; go to next dest pixel
|
||
dec ecx ; one less to go.
|
||
jnz run_loop
|
||
jmp top_loop
|
||
|
||
;
|
||
; By now, we know it must be a LONGDUMP, SHORTSKIP, LONGRUN, or LONGSKIP
|
||
;
|
||
|
||
check_others:
|
||
sub eax,080h ; opcode -= 0x80
|
||
jnz do_skip ; if zero then get next word, otherwise use remainder.
|
||
|
||
mov ax,[esi]
|
||
lea esi,[esi+2] ; get word code in ax
|
||
test ax,ax ; set flags. (not 32bit register so neg flag works)
|
||
jle not_long_skip
|
||
|
||
;
|
||
; SHORTSKIP AND LONGSKIP
|
||
;
|
||
do_skip:
|
||
add edi,eax ; do the skip.
|
||
jmp top_loop
|
||
|
||
|
||
not_long_skip:
|
||
jz stop ; long count of zero means stop
|
||
sub eax,08000h ; opcode -= 0x8000
|
||
test eax,04000h ; is it a LONGRUN (code & 0x4000)?
|
||
je long_dump
|
||
|
||
;
|
||
; LONGRUN
|
||
;
|
||
sub eax,04000h ; opcode -= 0x4000
|
||
mov ecx,eax ; use cx as loop count
|
||
jmp do_run ; jump to run code.
|
||
|
||
|
||
;
|
||
; LONGDUMP
|
||
;
|
||
|
||
long_dump:
|
||
mov ecx,eax ; use cx as loop count
|
||
jmp dump_loop ; go to the dump loop.
|
||
|
||
stop:
|
||
|
||
ret
|
||
|
||
Apply_XOR_Delta endp
|
||
|
||
|
||
;----------------------------------------------------------------------------
|
||
|
||
|
||
;***************************************************************************
|
||
;* APPLY_XOR_DELTA_To_Page_Or_Viewport -- Calls the copy or the XOR funtion. *
|
||
;* *
|
||
;* *
|
||
;* This funtion is call to either xor or copy XOR_Delta data onto a *
|
||
;* page instead of a buffer. The routine will set up the registers *
|
||
;* need for the actual routines that will perform the copy or xor. *
|
||
;* *
|
||
;* The registers are setup as follows : *
|
||
;* es:edi - destination segment:offset onto page. *
|
||
;* ds:esi - source buffer segment:offset of delta data. *
|
||
;* dx,cx,ax - are all zeroed out before entry. *
|
||
;* *
|
||
;* INPUT: *
|
||
;* *
|
||
;* OUTPUT: *
|
||
;* *
|
||
;* WARNINGS: *
|
||
;* *
|
||
;* HISTORY: *
|
||
;* 03/09/1992 SB : Created. *
|
||
;*=========================================================================*
|
||
|
||
|
||
Apply_XOR_Delta_To_Page_Or_Viewport proc C public USES ebx ecx edx esi edi target:DWORD, delta:DWORD, xwidth:DWORD, nextrow:DWORD, copy:DWORD
|
||
|
||
;USES ebx,ecx,edx,edi,esi
|
||
;ARG target:DWORD ; pointer to the destination buffer.
|
||
;ARG delta:DWORD ; pointer to the delta buffer.
|
||
;ARG width:DWORD ; width of animation.
|
||
;ARG nextrow:DWORD ; Page/Buffer width - anim width.
|
||
;ARG copy:DWORD ; should it be copied or xor'd?
|
||
|
||
|
||
mov edi,[target] ; Get the target pointer.
|
||
mov esi,[delta] ; Get the destination pointer.
|
||
|
||
xor eax,eax ; clear eax, later put them into ecx and edx.
|
||
|
||
cld ; make sure we go forward
|
||
|
||
mov ebx,[nextrow] ; get the amount to add to get to next row from end. push it later...
|
||
|
||
mov ecx,eax ; use cx for loop
|
||
mov edx,eax ; use dx to count the relative column.
|
||
|
||
push ebx ; push nextrow onto the stack for Copy/XOR_Delta_Buffer.
|
||
mov ebx,[xwidth] ; bx will hold the max column for speed compares
|
||
|
||
; At this point, all the registers have been set up. Now call the correct function
|
||
; to either copy or xor the data.
|
||
|
||
cmp [copy],DO_XOR ; Do we want to copy or XOR
|
||
je xorfunct ; Jump to XOR if not copy
|
||
call Copy_Delta_Buffer ; Call the function to copy the delta buffer.
|
||
jmp didcopy ; jump past XOR
|
||
xorfunct:
|
||
call XOR_Delta_Buffer ; Call funtion to XOR the deltat buffer.
|
||
didcopy:
|
||
pop ebx ; remove the push done to pass a value.
|
||
|
||
ret
|
||
|
||
Apply_XOR_Delta_To_Page_Or_Viewport ENDP
|
||
;----------------------------------------------------------------------------
|
||
|
||
|
||
;***************************************************************************
|
||
;* XOR_DELTA_BUFFER -- Xor's the data in a XOR Delta format to a page. *
|
||
;* This will only work right if the page has the previous data on it. *
|
||
;* This function should only be called by XOR_Delta_Buffer_To_Page_Or_Viewport. *
|
||
;* The registers must be setup as follows : *
|
||
;* *
|
||
;* INPUT: *
|
||
;* es:edi - destination segment:offset onto page. *
|
||
;* ds:esi - source buffer segment:offset of delta data. *
|
||
;* edx,ecx,eax - are all zeroed out before entry. *
|
||
;* *
|
||
;* OUTPUT: *
|
||
;* *
|
||
;* WARNINGS: *
|
||
;* *
|
||
;* HISTORY: *
|
||
;* 03/09/1992 SB : Created. *
|
||
;*=========================================================================*
|
||
|
||
XOR_Delta_Buffer proc C nextrow:DWORD
|
||
|
||
top_loop2:
|
||
xor eax,eax ; clear out eax.
|
||
mov al,[esi] ; get delta source byte
|
||
inc esi
|
||
|
||
test al,al ; check for a SHORTDUMP ; check al incase of sign value.
|
||
je short_run2
|
||
js check_others2
|
||
|
||
;
|
||
; SHORTDUMP
|
||
;
|
||
mov ecx,eax ; stick count in cx
|
||
|
||
dump_loop2:
|
||
mov al,[esi] ; get delta XOR byte
|
||
xor [edi],al ; xor that byte on the dest
|
||
inc esi
|
||
inc edx ; increment our count on current column
|
||
inc edi
|
||
cmp edx,ebx ; are we at the final column
|
||
jne end_col1 ; if not the jmp over the code
|
||
|
||
sub edi,edx ; get our column back to the beginning.
|
||
xor edx,edx ; zero out our column counter
|
||
add edi,[nextrow] ; jump to start of next row
|
||
end_col1:
|
||
|
||
dec ecx
|
||
jnz dump_loop2
|
||
jmp top_loop2
|
||
|
||
;
|
||
; SHORTRUN
|
||
;
|
||
|
||
short_run2:
|
||
mov cl,[esi] ; get count
|
||
inc esi ; inc delta source
|
||
|
||
do_run2:
|
||
mov al,[esi] ; get XOR byte
|
||
inc esi
|
||
|
||
run_loop2:
|
||
xor [edi],al ; xor that byte.
|
||
|
||
inc edx ; increment our count on current column
|
||
inc edi ; go to next dest pixel
|
||
cmp edx,ebx ; are we at the final column
|
||
jne end_col2 ; if not the jmp over the code
|
||
|
||
sub edi,ebx ; get our column back to the beginning.
|
||
xor edx,edx ; zero out our column counter
|
||
add edi,[nextrow] ; jump to start of next row
|
||
end_col2:
|
||
|
||
|
||
dec ecx
|
||
jnz run_loop2
|
||
jmp top_loop2
|
||
|
||
;
|
||
; By now, we know it must be a LONGDUMP, SHORTSKIP, LONGRUN, or LONGSKIP
|
||
;
|
||
|
||
check_others2:
|
||
sub eax,080h ; opcode -= 0x80
|
||
jnz do_skip2 ; if zero then get next word, otherwise use remainder.
|
||
|
||
mov ax,[esi] ; get word code in ax
|
||
lea esi,[esi+2]
|
||
test ax,ax ; set flags. (not 32bit register so neg flag works)
|
||
jle not_long_skip2
|
||
|
||
;
|
||
; SHORTSKIP AND LONGSKIP
|
||
;
|
||
do_skip2:
|
||
sub edi,edx ; go back to beginning or row.
|
||
add edx,eax ; incriment our count on current row
|
||
recheck2:
|
||
cmp edx,ebx ; are we past the end of the row
|
||
jb end_col3 ; if not the jmp over the code
|
||
|
||
sub edx,ebx ; Subtract width from the col counter
|
||
add edi,[nextrow] ; jump to start of next row
|
||
jmp recheck2 ; jump up to see if we are at the right row
|
||
end_col3:
|
||
add edi,edx ; get to correct position in row.
|
||
jmp top_loop2
|
||
|
||
|
||
not_long_skip2:
|
||
jz stop2 ; long count of zero means stop
|
||
sub eax,08000h ; opcode -= 0x8000
|
||
test eax,04000h ; is it a LONGRUN (code & 0x4000)?
|
||
je long_dump2
|
||
|
||
;
|
||
; LONGRUN
|
||
;
|
||
sub eax,04000h ; opcode -= 0x4000
|
||
mov ecx,eax ; use cx as loop count
|
||
jmp do_run2 ; jump to run code.
|
||
|
||
|
||
;
|
||
; LONGDUMP
|
||
;
|
||
|
||
long_dump2:
|
||
mov ecx,eax ; use cx as loop count
|
||
jmp dump_loop2 ; go to the dump loop.
|
||
|
||
stop2:
|
||
|
||
ret
|
||
|
||
|
||
XOR_Delta_Buffer ENDP
|
||
|
||
;----------------------------------------------------------------------------
|
||
|
||
|
||
;***************************************************************************
|
||
;* COPY_DELTA_BUFFER -- Copies XOR Delta Data to a section of a page. *
|
||
;* This function should only be called by XOR_Delta_Buffer_To_Page_Or_Viewport. *
|
||
;* The registers must be setup as follows : *
|
||
;* *
|
||
;* INPUT: *
|
||
;* es:edi - destination segment:offset onto page. *
|
||
;* ds:esi - source buffer segment:offset of delta data. *
|
||
;* dx,cx,ax - are all zeroed out before entry. *
|
||
;* *
|
||
;* OUTPUT: *
|
||
;* *
|
||
;* WARNINGS: *
|
||
;* *
|
||
;* HISTORY: *
|
||
;* 03/09/1992 SB : Created. *
|
||
;*=========================================================================*
|
||
Copy_Delta_Buffer proc C nextrow:DWORD
|
||
|
||
;ARG nextrow:DWORD
|
||
|
||
top_loop3:
|
||
xor eax,eax ; clear out eax.
|
||
mov al,[esi] ; get delta source byte
|
||
inc esi
|
||
|
||
test al,al ; check for a SHORTDUMP ; check al incase of sign value.
|
||
je short_run3
|
||
js check_others3
|
||
|
||
;
|
||
; SHORTDUMP
|
||
;
|
||
mov ecx,eax ; stick count in cx
|
||
|
||
dump_loop3:
|
||
mov al,[esi] ; get delta XOR byte
|
||
|
||
mov [edi],al ; store that byte on the dest
|
||
|
||
inc edx ; increment our count on current column
|
||
inc esi
|
||
inc edi
|
||
cmp edx,ebx ; are we at the final column
|
||
jne end_col1_3 ; if not the jmp over the code
|
||
|
||
sub edi,edx ; get our column back to the beginning.
|
||
xor edx,edx ; zero out our column counter
|
||
add edi,[nextrow] ; jump to start of next row
|
||
end_col1_3:
|
||
|
||
dec ecx
|
||
jnz dump_loop3
|
||
jmp top_loop3
|
||
|
||
;
|
||
; SHORTRUN
|
||
;
|
||
|
||
short_run3:
|
||
mov cl,[esi] ; get count
|
||
inc esi ; inc delta source
|
||
|
||
do_run3:
|
||
mov al,[esi] ; get XOR byte
|
||
inc esi
|
||
|
||
run_loop3:
|
||
mov [edi],al ; store the byte (instead of XOR against current color)
|
||
|
||
inc edx ; increment our count on current column
|
||
inc edi ; go to next dest pixel
|
||
cmp edx,ebx ; are we at the final column
|
||
jne end_col2_3 ; if not the jmp over the code
|
||
|
||
sub edi,ebx ; get our column back to the beginning.
|
||
xor edx,edx ; zero out our column counter
|
||
add edi,[nextrow] ; jump to start of next row
|
||
end_col2_3:
|
||
|
||
|
||
dec ecx
|
||
jnz run_loop3
|
||
jmp top_loop3
|
||
|
||
;
|
||
; By now, we know it must be a LONGDUMP, SHORTSKIP, LONGRUN, or LONGSKIP
|
||
;
|
||
|
||
check_others3:
|
||
sub eax,080h ; opcode -= 0x80
|
||
jnz do_skip3 ; if zero then get next word, otherwise use remainder.
|
||
|
||
mov ax,[esi] ; get word code in ax
|
||
lea esi,[esi+2]
|
||
test ax,ax ; set flags. (not 32bit register so neg flag works)
|
||
jle not_long_skip3
|
||
|
||
;
|
||
; SHORTSKIP AND LONGSKIP
|
||
;
|
||
do_skip3:
|
||
sub edi,edx ; go back to beginning or row.
|
||
add edx,eax ; incriment our count on current row
|
||
recheck3:
|
||
cmp edx,ebx ; are we past the end of the row
|
||
jb end_col3_3 ; if not the jmp over the code
|
||
|
||
sub edx,ebx ; Subtract width from the col counter
|
||
add edi,[nextrow] ; jump to start of next row
|
||
jmp recheck3 ; jump up to see if we are at the right row
|
||
end_col3_3:
|
||
add edi,edx ; get to correct position in row.
|
||
jmp top_loop3
|
||
|
||
|
||
not_long_skip3:
|
||
jz stop3 ; long count of zero means stop
|
||
sub eax,08000h ; opcode -= 0x8000
|
||
test eax,04000h ; is it a LONGRUN (code & 0x4000)?
|
||
je long_dump3
|
||
|
||
;
|
||
; LONGRUN
|
||
;
|
||
sub eax,04000h ; opcode -= 0x4000
|
||
mov ecx,eax ; use cx as loop count
|
||
jmp do_run3 ; jump to run code.
|
||
|
||
|
||
;
|
||
; LONGDUMP
|
||
;
|
||
|
||
long_dump3:
|
||
mov ecx,eax ; use cx as loop count
|
||
jmp dump_loop3 ; go to the dump loop.
|
||
|
||
stop3:
|
||
|
||
ret
|
||
|
||
Copy_Delta_Buffer ENDP
|
||
|
||
;----------------------------------------------------------------------------
|
||
|
||
END
|
||
|
||
|
||
;----------------------------------------------------------------------------
|
||
;
|
||
;PUBLIC UWORD Apply_XOR_Delta(UWORD page_seg, BYTE *delta_ptr)
|
||
;{
|
||
;
|
||
; register UWORD loop;
|
||
; BYTE opcode, xor_byte;
|
||
; UWORD bytes_to_uncompress = 64000U;
|
||
;
|
||
;
|
||
; /* Make our buffer pointer */
|
||
;
|
||
; to = MK_FP(page_seg, 0);
|
||
; delta = Normalize_Pointer(delta_ptr);
|
||
;
|
||
;
|
||
; while (bytes_to_uncompress) {
|
||
;
|
||
; opcode = *delta++;
|
||
;
|
||
;
|
||
; /* Check for SHORTDUMP */
|
||
;
|
||
; if (opcode > 0) {
|
||
;
|
||
;
|
||
; bytes_to_uncompress -= opcode;
|
||
;
|
||
; for (loop = 0; loop < opcode; loop++) {
|
||
; xor_byte = *delta++;
|
||
; *to++ ^= xor_byte;
|
||
; }
|
||
; continue;
|
||
; }
|
||
;
|
||
; /* Check for SHORTRUN */
|
||
;
|
||
; if (opcode == 0) {
|
||
;
|
||
; word_count = *delta++;
|
||
; xor_byte = *delta++;
|
||
;
|
||
; bytes_to_uncompress -= word_count;
|
||
;
|
||
; for (loop = 0; loop < word_count; loop++) {
|
||
; *to++ ^= xor_byte;
|
||
; }
|
||
; continue;
|
||
; }
|
||
;
|
||
; /* By now, we know it must be a LONGDUMP, SHORTSKIP, or LONGSKIP */
|
||
;
|
||
; opcode -= 0x80;
|
||
;
|
||
;
|
||
; /* Is it a SHORTSKIP? */
|
||
;
|
||
; if (opcode != 0) {
|
||
;
|
||
; to += opcode;
|
||
; bytes_to_uncompress -= (WORD) opcode;
|
||
; continue;
|
||
; }
|
||
;
|
||
;
|
||
; word_count = *((UWORD *) delta)++;
|
||
;
|
||
; /* Is it a LONGSKIP? */
|
||
;
|
||
; if ((WORD) word_count > 0) {
|
||
;
|
||
; to += word_count;
|
||
; bytes_to_uncompress -= (WORD) word_count;
|
||
; continue;
|
||
; }
|
||
;
|
||
;
|
||
; word_count -= 0x8000;
|
||
;
|
||
; /* Is it a LONGRUN? */
|
||
;
|
||
; if (word_count & 0x4000) {
|
||
;
|
||
; word_count -= 0x4000;
|
||
;
|
||
; bytes_to_uncompress -= word_count;
|
||
;
|
||
; xor_byte = *delta++;
|
||
;
|
||
; for (loop = 0; loop < word_count; loop++) {
|
||
; *to++ ^= xor_byte;
|
||
; }
|
||
; continue;
|
||
; }
|
||
;
|
||
;
|
||
; /* It must be a LONGDUMP */
|
||
;
|
||
; bytes_to_uncompress -= word_count;
|
||
;
|
||
; for (loop = 0; loop < word_count; loop++) {
|
||
; xor_byte = *delta++;
|
||
; *to++ ^= xor_byte;
|
||
; }
|
||
; }
|
||
;
|
||
;
|
||
; return(64000U);
|
||
;}
|
||
;
|
||
|
||
|