nuclear@0: /*
nuclear@0: 256-color 3D graphics hack for real-mode DOS.
nuclear@0: Copyright (C) 2011  John Tsiombikas <nuclear@member.fsf.org>
nuclear@0: 
nuclear@0: This program is free software: you can redistribute it and/or modify
nuclear@0: it under the terms of the GNU General Public License as published by
nuclear@0: the Free Software Foundation, either version 3 of the License, or
nuclear@0: (at your option) any later version.
nuclear@0: 
nuclear@0: This program is distributed in the hope that it will be useful,
nuclear@0: but WITHOUT ANY WARRANTY; without even the implied warranty of
nuclear@0: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nuclear@0: GNU General Public License for more details.
nuclear@0: 
nuclear@0: You should have received a copy of the GNU General Public License
nuclear@0: along with this program.  If not, see <http://www.gnu.org/licenses/>.
nuclear@0: */
nuclear@0: #include <dos.h>
nuclear@0: #include <string.h>
nuclear@0: 
nuclear@0: void set_video_mode(int mode)
nuclear@0: {
nuclear@0: 	asm {
nuclear@0: 		mov ax, mode
nuclear@0: 		int 0x10
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void set_palette(unsigned char c, unsigned char r, unsigned char g, unsigned char b)
nuclear@0: {
nuclear@0: 	asm {
nuclear@0: 		mov dx, 0x3c8
nuclear@0: 		mov al, c
nuclear@0: 		out dx, al
nuclear@0: 		inc dx
nuclear@0: 		mov al, r
nuclear@0: 		shr al, 2
nuclear@0: 		out dx, al
nuclear@0: 		mov al, g
nuclear@0: 		shr al, 2
nuclear@0: 		out dx, al
nuclear@0: 		mov al, b
nuclear@0: 		shr al, 2
nuclear@0: 		out dx, al
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void copy_frame(unsigned char *frame)
nuclear@0: {
nuclear@0: 	_fmemcpy(MK_FP(0xa000, 0), frame, 64000);
nuclear@0: }
nuclear@0: 
nuclear@0: void wait_vsync(void)
nuclear@0: {
nuclear@0: 	asm mov dx, 0x3da
nuclear@0: l1:
nuclear@0: 	asm {
nuclear@0: 		in al, dx
nuclear@0: 		and al, 0x8
nuclear@0: 		jnz l1
nuclear@0: 	}
nuclear@0: l2:
nuclear@0: 	asm {
nuclear@0: 		in al, dx
nuclear@0: 		and al, 0x8
nuclear@0: 		jz l2
nuclear@0: 	}
nuclear@0: }