136 lines
3.6 KiB
C++
136 lines
3.6 KiB
C++
/*
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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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*
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* 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
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*
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*----------------------------------------------------------------------------
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*
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* FILE
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* vesablit.c
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*
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* DESCRIPTION
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* VESA bitblit routines. (32-Bit protected mode)
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*
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* PROGRAMMER
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* Bill Randolph
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* Denzil E. Long, Jr.
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*
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* DATE
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* January 26, 1995
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*
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*----------------------------------------------------------------------------
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*
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* PUBLIC
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* VESA_Blit_640x480 - Blit to 640x480 256 color VESA mode.
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*
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****************************************************************************/
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#include <stdio.h>
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#include <mem.h>
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#include <dos.h>
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#include "video.h"
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#include "vesavid.h"
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#include "vesablit.h"
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/****************************************************************************
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*
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* NAME
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* VESA_Blit_640x480 - Blit to 640x480 256 color VESA mode.
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*
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* SYNOPSIS
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* VESA_Blit_640x480(DisplayInfo, Buffer, X, Y, Width, Height)
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*
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* void VESA_Blit_640x480(DisplayInfo *, char *, long, long, long, long);
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*
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* FUNCTION
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*
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* INPUTS
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* DisplayInfo - Pointer to display information structure.
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* Buffer - Pointer to buffer to blit to VRAM.
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* X - Destination X coordinate of blit (upper left).
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* Y - Destination Y coordinate of blit (upper left).
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* Width - Width of blit.
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* Height - Height of blit.
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*
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* RESULT
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* NONE
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*
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****************************************************************************/
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void VESA_Blit_640x480(DisplayInfo *disp,unsigned char *buf,long x1,long y1,
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long width,long height)
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{
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VESAModeInfo *vminfo;
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long bank;
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long last_bank;
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long bank_offset;
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long scrn_offset;
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long grains_per_win;
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long part1;
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long part2;
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long i;
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/* Initialize values */
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vminfo = (VESAModeInfo *)disp->Extended;
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scrn_offset = ((disp->XRes * y1) + x1);
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grains_per_win = ((long)vminfo->WinSize / (long)vminfo->WinGranularity);
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bank_offset = scrn_offset % 65536L;
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last_bank = -1;
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for (i = 0; i < height; i++) {
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/* Compute which bank this scanline is in */
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bank = (scrn_offset / 65536L);
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/* Set a new bank */
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if (bank != last_bank) {
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SetVESAWindow(bank);
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last_bank = bank;
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bank_offset = (scrn_offset % 65536L);
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}
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/* Copy a full scanline */
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if ((bank_offset + width) < 65536L) {
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Copy_Row((char *)buf, (char *)bank_offset, width);
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buf += width;
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scrn_offset += disp->XRes;
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bank_offset += disp->XRes;
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}
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/* Copy two partial scanlines */
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else {
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part1 = (65536L - bank_offset);
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part2 = (width - part1);
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Copy_Row((char *)buf, (char *)bank_offset, part1);
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buf += part1;
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bank += grains_per_win;
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last_bank += grains_per_win;
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SetVESAWindow(bank);
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Copy_Row((char *)buf, (char *)0, part2);
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buf += part2;
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scrn_offset += disp->XRes;
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bank_offset = (scrn_offset % 65536L);
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}
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}
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}
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