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: 
nuclear@0: /* This file implements all calls made to dos-specific code using SDL
nuclear@0:  * Don't ask why ...
nuclear@0:  */
nuclear@0: 
nuclear@0: #include <stdlib.h>
nuclear@0: #include <assert.h>
nuclear@0: #include <SDL.h>
nuclear@0: #include "vga.h"
nuclear@0: #include "conio.h"
nuclear@0: #include "mouse.h"
nuclear@0: #include "timer.h"
nuclear@0: 
nuclear@0: static void proc_events(void);
nuclear@0: 
nuclear@0: /* ----- graphics (vga.c implementation) ----- */
nuclear@0: static SDL_Surface *fbsurf;
nuclear@0: 
nuclear@0: #define DOUBLESZ	(fbsurf->w != 320)
nuclear@0: 
nuclear@0: void set_video_mode(int mode)
nuclear@0: {
nuclear@0: 	int resx = 320, resy = 200;
nuclear@9: 	unsigned int sdl_flags = SDL_HWPALETTE;
nuclear@0: 
nuclear@0: 	if(getenv("DOSEMU_DOUBLESIZE")) {
nuclear@0: 		resx *= 2;
nuclear@0: 		resy *= 2;
nuclear@0: 	}
nuclear@0: 
nuclear@9: 	if(getenv("DOSEMU_FULLSCREEN")) {
nuclear@9: 		sdl_flags |= SDL_FULLSCREEN;
nuclear@9: 	}
nuclear@9: 
nuclear@0: 	switch(mode) {
nuclear@0: 	case 0x13:
nuclear@0: 		SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER);
nuclear@9: 		if(!(fbsurf = SDL_SetVideoMode(resx, resy, 8, sdl_flags))) {
nuclear@0: 			fprintf(stderr, "failed to set video mode\n");
nuclear@0: 			abort();
nuclear@0: 		}
nuclear@0: 		SDL_ShowCursor(0);
nuclear@11: 		SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	case 3:
nuclear@0: 		SDL_ShowCursor(1);
nuclear@11: 		SDL_EnableKeyRepeat(0, 0);
nuclear@0: 		SDL_Quit();
nuclear@0: 		break;
nuclear@0: 
nuclear@0: 	default:
nuclear@0: 		break;
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: 	SDL_Color col;
nuclear@0: 	col.r = r;
nuclear@0: 	col.g = g;
nuclear@0: 	col.b = b;
nuclear@0: 
nuclear@0: 	if(SDL_SetPalette(fbsurf, SDL_LOGPAL | SDL_PHYSPAL, &col, c, 1) != 1) {
nuclear@0: 		fprintf(stderr, "set_palette failed to set the required color\n");
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: void copy_frame(unsigned char *frame)
nuclear@0: {
nuclear@0: 	if(SDL_MUSTLOCK(fbsurf)) {
nuclear@0: 		SDL_LockSurface(fbsurf);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(DOUBLESZ) {
nuclear@0: 		int i, j;
nuclear@0: 		Uint16 *dest = fbsurf->pixels;
nuclear@0: 
nuclear@0: 		for(i=0; i<200; i++) {
nuclear@0: 			for(j=0; j<320; j++) {
nuclear@0: 				Uint16 twopix = ((Uint16)*frame << 8) | (Uint16)*frame;
nuclear@0: 				dest[j] = dest[j + 320] = twopix;
nuclear@0: 				frame++;
nuclear@0: 			}
nuclear@0: 			dest += fbsurf->pitch;
nuclear@0: 		}
nuclear@0: 	} else {
nuclear@0: 		memcpy(fbsurf->pixels, frame, 64000);
nuclear@0: 	}
nuclear@0: 
nuclear@0: 	if(SDL_MUSTLOCK(fbsurf)) {
nuclear@0: 		SDL_UnlockSurface(fbsurf);
nuclear@0: 	}
nuclear@0: 	SDL_Flip(fbsurf);
nuclear@0: }
nuclear@0: 
nuclear@0: void wait_vsync(void)
nuclear@0: {
nuclear@0: }
nuclear@0: 
nuclear@0: /* ----- event handling (conio.h) ----- */
nuclear@0: static SDL_Event *keybev;
nuclear@0: static int mousex, mousey, bnmask;
nuclear@0: 
nuclear@0: int kbhit(void)
nuclear@0: {
nuclear@0: 	if(!keybev) {
nuclear@0: 		proc_events();
nuclear@0: 	}
nuclear@0: 	return keybev != 0;
nuclear@0: }
nuclear@0: 
nuclear@9: int getch(void)
nuclear@0: {
nuclear@9: 	int res;
nuclear@0: 
nuclear@0: 	while(!keybev) {
nuclear@0: 		SDL_Event ev;
nuclear@0: 		SDL_WaitEvent(&ev);
nuclear@0: 		SDL_PushEvent(&ev);
nuclear@0: 		proc_events();
nuclear@0: 	}
nuclear@0: 	res = keybev->key.keysym.sym;
nuclear@0: 	keybev = 0;
nuclear@0: 	return res;
nuclear@0: }
nuclear@0: 
nuclear@0: /* mouse handling (mouse.c implementation) */
nuclear@0: int have_mouse(void)
nuclear@0: {
nuclear@0: 	return 1;
nuclear@0: }
nuclear@0: 
nuclear@0: int read_mouse(int *xp, int *yp)
nuclear@0: {
nuclear@0: 	if(xp) *xp = mousex;
nuclear@0: 	if(yp) *yp = mousey;
nuclear@0: 	return bnmask;
nuclear@0: }
nuclear@0: 
nuclear@0: static void proc_events(void)
nuclear@0: {
nuclear@0: 	static SDL_Event ev;
nuclear@0: 
nuclear@0: 	while(SDL_PollEvent(&ev)) {
nuclear@0: 		switch(ev.type) {
nuclear@0: 		case SDL_KEYDOWN:
nuclear@0: 			keybev = &ev;
nuclear@0: 			return;
nuclear@0: 
nuclear@0: 		case SDL_MOUSEMOTION:
nuclear@0: 			mousex = ev.motion.x;
nuclear@0: 			mousey = ev.motion.y;
nuclear@0: 
nuclear@0: 			if(DOUBLESZ) {
nuclear@0: 				mousex /= 2;
nuclear@0: 				mousey /= 2;
nuclear@0: 			}
nuclear@0: 			break;
nuclear@0: 
nuclear@0: 		case SDL_MOUSEBUTTONDOWN:
nuclear@0: 		case SDL_MOUSEBUTTONUP:
nuclear@0: 			{
nuclear@0: 				int mask = 0;
nuclear@0: 				switch(ev.button.button) {
nuclear@0: 				case SDL_BUTTON_LEFT:
nuclear@0: 					mask = MOUSE_LEFT;
nuclear@0: 					break;
nuclear@0: 				case SDL_BUTTON_MIDDLE:
nuclear@0: 					mask = MOUSE_MIDDLE;
nuclear@0: 					break;
nuclear@0: 				case SDL_BUTTON_RIGHT:
nuclear@0: 					mask = MOUSE_RIGHT;
nuclear@0: 				default:
nuclear@0: 					break;
nuclear@0: 				}
nuclear@0: 				if(!mask) {
nuclear@0: 					break;
nuclear@0: 				}
nuclear@0: 
nuclear@0: 				if(ev.button.state == SDL_PRESSED) {
nuclear@0: 					bnmask |= mask;
nuclear@0: 				} else {
nuclear@0: 					bnmask &= ~mask;
nuclear@0: 				}
nuclear@0: 			}
nuclear@0: 			break;
nuclear@0: 
nuclear@0: 		default:
nuclear@0: 			break;
nuclear@0: 		}
nuclear@0: 	}
nuclear@0: }
nuclear@0: 
nuclear@0: /* ---- timer.c implementation ---- */
nuclear@0: static Uint32 start_time;
nuclear@0: 
nuclear@0: void init_timer(int res_hz)
nuclear@0: {
nuclear@0: 	reset_timer();
nuclear@0: }
nuclear@0: 
nuclear@0: void reset_timer(void)
nuclear@0: {
nuclear@0: 	start_time = SDL_GetTicks();
nuclear@0: }
nuclear@0: 
nuclear@0: unsigned long get_msec(void)
nuclear@0: {
nuclear@0: 	return (unsigned long)(SDL_GetTicks() - start_time);
nuclear@0: }