1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/vga.c	Mon Nov 21 06:14:01 2011 +0200
     1.3 @@ -0,0 +1,68 @@
     1.4 +/*
     1.5 +256-color 3D graphics hack for real-mode DOS.
     1.6 +Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
     1.7 +
     1.8 +This program is free software: you can redistribute it and/or modify
     1.9 +it under the terms of the GNU General Public License as published by
    1.10 +the Free Software Foundation, either version 3 of the License, or
    1.11 +(at your option) any later version.
    1.12 +
    1.13 +This program is distributed in the hope that it will be useful,
    1.14 +but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.16 +GNU General Public License for more details.
    1.17 +
    1.18 +You should have received a copy of the GNU General Public License
    1.19 +along with this program.  If not, see <http://www.gnu.org/licenses/>.
    1.20 +*/
    1.21 +#include <dos.h>
    1.22 +#include <string.h>
    1.23 +
    1.24 +void set_video_mode(int mode)
    1.25 +{
    1.26 +	asm {
    1.27 +		mov ax, mode
    1.28 +		int 0x10
    1.29 +	}
    1.30 +}
    1.31 +
    1.32 +void set_palette(unsigned char c, unsigned char r, unsigned char g, unsigned char b)
    1.33 +{
    1.34 +	asm {
    1.35 +		mov dx, 0x3c8
    1.36 +		mov al, c
    1.37 +		out dx, al
    1.38 +		inc dx
    1.39 +		mov al, r
    1.40 +		shr al, 2
    1.41 +		out dx, al
    1.42 +		mov al, g
    1.43 +		shr al, 2
    1.44 +		out dx, al
    1.45 +		mov al, b
    1.46 +		shr al, 2
    1.47 +		out dx, al
    1.48 +	}
    1.49 +}
    1.50 +
    1.51 +void copy_frame(unsigned char *frame)
    1.52 +{
    1.53 +	_fmemcpy(MK_FP(0xa000, 0), frame, 64000);
    1.54 +}
    1.55 +
    1.56 +void wait_vsync(void)
    1.57 +{
    1.58 +	asm mov dx, 0x3da
    1.59 +l1:
    1.60 +	asm {
    1.61 +		in al, dx
    1.62 +		and al, 0x8
    1.63 +		jnz l1
    1.64 +	}
    1.65 +l2:
    1.66 +	asm {
    1.67 +		in al, dx
    1.68 +		and al, 0x8
    1.69 +		jz l2
    1.70 +	}
    1.71 +}