404 lines
11 KiB
NASM
404 lines
11 KiB
NASM
;
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; Command & Conquer Red Alert(tm)
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; Copyright 2025 Electronic Arts Inc.
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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;***************************************************************************
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;** 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 **
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;***************************************************************************
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;* *
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;* Project Name : Westwood 32 bit Library *
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;* *
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;* File Name : BITBLIT.ASM *
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;* *
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;* Programmer : Phil W. Gorrow *
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;* *
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;* Start Date : June 8, 1994 *
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;* *
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;* Last Update : December 13, 1994 [PWG] *
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;* *
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;*-------------------------------------------------------------------------*
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;* Functions: *
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;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
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IDEAL
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P386
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MODEL USE32 FLAT
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LOCALS ??
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INCLUDE "svgaprim.inc"
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INCLUDE "gbuffer.inc"
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TRANSP equ 0
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CODESEG
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;***************************************************************************
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;* GVC::BLIT -- Copies a buffer to a graphic page non-linearly *
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;* *
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;* NOTE: All coordinate values are expressed in pixels *
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;* *
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;* INPUT: VideoViewPortClass *dest - Video View Port to copy to *
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;* WORD src_x - Src x position to copy from *
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;* WORD src_y - Src y position to copy from *
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;* WORD dst_x - Dest x position to copy to *
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;* WORD dst_y - Dest y position to copy to *
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;* WORD w - Width of region to copy *
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;* WORD h - Height of region to copy *
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;* *
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;* OUTPUT: none *
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;* *
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;* WARNINGS: Coordinates and dimensions will be adjusted if they exceed *
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;* the boundaries. In the event that no adjustment is *
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;* possible this routine will abort. *
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;* *
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;* HISTORY: *
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;* 05/11/1994 PWG : Created. *
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;* 08/05/1994 PWG : Fixed clipping problem *
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;*=========================================================================*
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PROC Linear_Blit_To_Vesa C near
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USES ebx,ecx,edx,esi,edi
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;*===================================================================
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;* define the arguements that our function takes.
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;*===================================================================
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ARG this :DWORD ; this is a member function
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ARG dest :DWORD ; what are we blitting to
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ARG x_pixel :DWORD ; x pixel position in source
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ARG y_pixel :DWORD ; y pixel position in source
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ARG dest_x0 :dword
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ARG dest_y0 :dword
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ARG pixel_width :DWORD ; width of rectangle to blit
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ARG pixel_height:DWORD ; height of rectangle to blit
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ARG trans :DWORD ; do we deal with transparents?
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;*===================================================================
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; Define some locals so that we can handle things quickly
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;*===================================================================
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LOCAL x1_pixel :dword
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LOCAL y1_pixel :dword
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LOCAL dest_x1 : dword
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LOCAL dest_y1 : dword
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LOCAL scr_ajust_width:DWORD
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LOCAL dest_ajust_width:DWORD
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LOCAL source_area : dword
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LOCAL dest_area : dword
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; Clip Source Rectangle against source Window boundaries.
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mov esi , [ this ] ; get ptr to src
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xor ecx , ecx
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xor edx , edx
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mov edi , [ (VideoViewPort esi) . VIVPWidth ] ; get width into register
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mov ebx , [ x_pixel ]
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mov eax , [ x_pixel ]
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add ebx , [ pixel_width ]
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shld ecx , eax , 1
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mov [ x1_pixel ] , ebx
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inc edi
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shld edx , ebx , 1
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sub eax , edi
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sub ebx , edi
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shld ecx , eax , 1
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shld edx , ebx , 1
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mov edi,[ ( VideoViewPort esi) . VIVPHeight ] ; get height into register
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mov ebx , [ y_pixel ]
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mov eax , [ y_pixel ]
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add ebx , [ pixel_height ]
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shld ecx , eax , 1
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mov [ y1_pixel ] , ebx
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inc edi
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shld edx , ebx , 1
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sub eax , edi
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sub ebx , edi
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shld ecx , eax , 1
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shld edx , ebx , 1
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xor cl , 5
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xor dl , 5
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mov al , cl
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test dl , cl
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jnz ??real_out
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or al , dl
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jz ??clip_against_dest
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test cl , 1000b
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jz ??scr_left_ok
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mov [ x_pixel ] , 0
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??scr_left_ok:
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test cl , 0010b
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jz ??scr_bottom_ok
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mov [ y_pixel ] , 0
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??scr_bottom_ok:
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test dl , 0100b
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jz ??scr_right_ok
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mov eax , [ (VideoViewPort esi) . VIVPWidth ] ; get width into register
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mov [ x1_pixel ] , eax
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??scr_right_ok:
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test dl , 0001b
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jz ??clip_against_dest
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mov eax , [ (VideoViewPort esi) . VIVPHeight ] ; get width into register
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mov [ y1_pixel ] , eax
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; Clip Source Rectangle against destination Window boundaries.
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??clip_against_dest:
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mov eax , [ dest_x0 ]
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mov ebx , [ dest_y0 ]
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sub eax , [ x_pixel ]
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sub ebx , [ y_pixel ]
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add eax , [ x1_pixel ]
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add ebx , [ y1_pixel ]
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mov [ dest_x1 ] , eax
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mov [ dest_y1 ] , ebx
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mov esi , [ dest ] ; get ptr to src
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xor ecx , ecx
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xor edx , edx
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mov edi , [ (VideoViewPort esi) . VIVPWidth ] ; get width into register
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mov eax , [ dest_x0 ]
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mov ebx , [ dest_x1 ]
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shld ecx , eax , 1
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inc edi
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shld edx , ebx , 1
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sub eax , edi
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sub ebx , edi
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shld ecx , eax , 1
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shld edx , ebx , 1
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mov edi,[ ( VideoViewPort esi) . VIVPHeight ] ; get height into register
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mov eax , [ dest_y0 ]
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mov ebx , [ dest_y1 ]
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shld ecx , eax , 1
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inc edi
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shld edx , ebx , 1
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sub eax , edi
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sub ebx , edi
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shld ecx , eax , 1
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shld edx , ebx , 1
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xor cl , 5
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xor dl , 5
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mov al , cl
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test dl , cl
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jnz ??real_out
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or al , dl
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jz ??do_blit
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test cl , 1000b
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jz ??dest_left_ok
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mov eax , [ dest_x0 ]
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mov [ dest_x0 ] , 0
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sub [ x_pixel ] , eax
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??dest_left_ok:
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test cl , 0010b
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jz ??dest_bottom_ok
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mov eax , [ dest_y0 ]
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mov [ dest_y0 ] , 0
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sub [ y_pixel ] , eax
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??dest_bottom_ok:
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test dl , 0100b
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jz ??dest_right_ok
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mov ebx , [ (VideoViewPort esi) . VIVPWidth ] ; get width into register
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mov eax , [ dest_x1 ]
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mov [ dest_x1 ] , ebx
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sub eax , ebx
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sub [ x1_pixel ] , eax
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??dest_right_ok:
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test dl , 0001b
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jz ??do_blit
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mov ebx , [ (VideoViewPort esi) . VIVPHeight ] ; get width into register
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mov eax , [ dest_y1 ]
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mov [ dest_y1 ] , ebx
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sub eax , ebx
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sub [ y1_pixel ] , eax
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??do_blit:
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cld
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mov ebx , [ this ]
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mov esi , [ (VideoViewPort ebx) . VIVPOffset ]
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mov eax , [ (VideoViewPort ebx) . VIVPXAdd ]
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add eax , [ (VideoViewPort ebx) . VIVPWidth ]
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mov ecx , eax
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mul [ y_pixel ]
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add esi , [ x_pixel ]
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mov [ source_area ] , ecx
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add esi , eax
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add ecx , [ x_pixel ]
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sub ecx , [ x1_pixel ]
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mov [ scr_ajust_width ] , ecx
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mov ebx , [ dest ]
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mov edi , [ (VideoViewPort ebx) . VIVPOffset ]
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mov eax , [ (VideoViewPort ebx) . VIVPXAdd ]
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add eax , [ (VideoViewPort ebx) . VIVPWidth ]
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mov ecx , eax
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mul [ dest_y0 ]
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add edi , [ dest_x0 ]
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mov [ dest_area ] , ecx
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add edi , eax
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Call Vesa_Asm_Set_Win ; set the window
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mov eax , [ dest_x1 ]
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sub eax , [ dest_x0 ]
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jz ??real_out
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sub ecx , eax
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mov [ dest_ajust_width ] , ecx
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mov edx , [ dest_y1 ]
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sub edx , [ dest_y0 ]
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jz ??real_out
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; ********************************************************************
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; Forward bitblit only
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IF TRANSP
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test [ trans ] , 1
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jnz ??forward_Blit_trans
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ENDIF
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; the inner loop is so efficient that
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; the optimal consept no longer apply because
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; the optimal byte have to by a number greather than 9 bytes
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cmp eax , 10
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jl ??forward_loop_bytes
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??forward_loop_dword:
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lea ebx , [ edi + eax ]
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add ebx , [ cpu_video_page ]
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cmp ebx , [ cpu_page_limit ]
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jl ??in_range
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xor ecx , ecx
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mov ebx , eax
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cmp edi , 0b0000h
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jge ??no_trailing
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mov ecx , 0b0000h
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sub ecx , edi
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sub ebx , ecx
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rep movsb
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??no_trailing:
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add edi , [ cpu_video_page ]
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Call Vesa_Asm_Set_Win ; set the window
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mov ecx , ebx
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rep movsb
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add esi , [ scr_ajust_width ]
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add edi , [ dest_ajust_width ]
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dec edx ; decrement the height
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jnz ??forward_loop_dword
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ret
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??in_range:
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mov ecx , edi
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mov ebx , eax
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neg ecx
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and ecx , 3
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sub ebx , ecx
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rep movsb
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mov ecx , ebx
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shr ecx , 2
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rep movsd
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mov ecx , ebx
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and ecx , 3
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rep movsb
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add esi , [ scr_ajust_width ]
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add edi , [ dest_ajust_width ]
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dec edx
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jnz ??forward_loop_dword
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ret
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??forward_loop_bytes:
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lea ebx , [ edi + eax ]
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add ebx , [ cpu_video_page ]
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cmp ebx , [ cpu_page_limit ]
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mov ebx , eax
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jl ??in_range_bytes
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xor ecx , ecx
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cmp edi , 0b0000h
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jge ??no_trailing_bytes
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mov ecx , 0b0000h
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sub ecx , edi
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sub ebx , ecx
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rep movsb
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??no_trailing_bytes:
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add edi , [ cpu_video_page ]
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Call Vesa_Asm_Set_Win ; set the window
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??in_range_bytes:
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mov ecx , ebx
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rep movsb
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add esi , [ scr_ajust_width ]
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add edi , [ dest_ajust_width ]
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dec edx ; decrement the height
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jnz ??forward_loop_bytes
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ret
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IF TRANSP
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??forward_Blit_trans:
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mov ecx , eax
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and ecx , 01fh
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lea ecx , [ ecx + ecx * 4 ]
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neg ecx
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shr eax , 5
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lea ecx , [ ??transp_reference + ecx * 2 ]
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mov [ y1_pixel ] , ecx
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??forward_loop_trans:
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mov ecx , eax
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jmp [ y1_pixel ]
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??forward_trans_line:
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REPT 32
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local transp_pixel
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mov bl , [ esi ]
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test bl , bl
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jz transp_pixel
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mov [ edi ] , bl
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transp_pixel:
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inc esi
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inc edi
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ENDM
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??transp_reference:
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dec ecx
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jge ??forward_trans_line
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add esi , [ scr_ajust_width ]
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add edi , [ dest_ajust_width ]
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dec edx
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jnz ??forward_loop_trans
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ret
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ENDIF
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??real_out:
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ret
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ENDP Linear_Blit_To_Vesa
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END
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