annotate src/vga.c @ 0:f04884489bad
dos3d initial import
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John Tsiombikas <nuclear@member.fsf.org> |
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Mon, 21 Nov 2011 06:14:01 +0200 (2011-11-21) |
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1 /*
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2 256-color 3D graphics hack for real-mode DOS.
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3 Copyright (C) 2011 John Tsiombikas <nuclear@member.fsf.org>
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4
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation, either version 3 of the License, or
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8 (at your option) any later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18 #include <dos.h>
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19 #include <string.h>
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20
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21 void set_video_mode(int mode)
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22 {
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23 asm {
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24 mov ax, mode
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25 int 0x10
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26 }
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27 }
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28
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29 void set_palette(unsigned char c, unsigned char r, unsigned char g, unsigned char b)
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30 {
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31 asm {
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32 mov dx, 0x3c8
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33 mov al, c
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34 out dx, al
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35 inc dx
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36 mov al, r
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37 shr al, 2
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38 out dx, al
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39 mov al, g
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40 shr al, 2
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41 out dx, al
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42 mov al, b
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43 shr al, 2
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44 out dx, al
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45 }
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46 }
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47
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48 void copy_frame(unsigned char *frame)
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49 {
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50 _fmemcpy(MK_FP(0xa000, 0), frame, 64000);
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51 }
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52
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53 void wait_vsync(void)
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54 {
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55 asm mov dx, 0x3da
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56 l1:
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57 asm {
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58 in al, dx
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59 and al, 0x8
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60 jnz l1
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61 }
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62 l2:
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63 asm {
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64 in al, dx
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65 and al, 0x8
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66 jz l2
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67 }
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68 }
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