1 /*

2 256-color 3D graphics hack for real-mode DOS.

3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>

4

5 This program is free software: you can redistribute it and/or modify

6 it under the terms of the GNU General Public License as published by

7 the Free Software Foundation, either version 3 of the License, or

8 (at your option) any later version.

9

10 This program is distributed in the hope that it will be useful,

11 but WITHOUT ANY WARRANTY; without even the implied warranty of

12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

13 GNU General Public License for more details.

14

15 You should have received a copy of the GNU General Public License

16 along with this program. If not, see <http://www.gnu.org/licenses/>.

17 */

18 #include <dos.h>

19 #include <string.h>

20

21 void set_video_mode(int mode)

22 {

23 asm {

24 mov ax, mode

25 int 0x10

26 }

27 }

28

29 void set_palette(unsigned char c, unsigned char r, unsigned char g, unsigned char b)

30 {

31 asm {

32 mov dx, 0x3c8

33 mov al, c

34 out dx, al

35 inc dx

36 mov al, r

37 shr al, 2

38 out dx, al

39 mov al, g

40 shr al, 2

41 out dx, al

42 mov al, b

43 shr al, 2

44 out dx, al

45 }

46 }

47

48 void copy_frame(unsigned char *frame)

49 {

50 _fmemcpy(MK_FP(0xa000, 0), frame, 64000);

51 }

52

53 void wait_vsync(void)

54 {

55 asm mov dx, 0x3da

56 l1:

57 asm {

58 in al, dx

59 and al, 0x8

60 jnz l1

61 }

62 l2:

63 asm {

64 in al, dx

65 and al, 0x8

66 jz l2

67 }

68 }