3 * Graphics functions for DOS.
28 #include <sys/nearptr.h>
31 static int last_r=0, last_g=0, last_b=0;
34 unsigned char * gr_video_memory = (unsigned char *)0xa0000;
36 char gr_pal_default[768];
40 volatile ubyte * pVideoMode = (volatile ubyte *)0x449;
41 volatile ushort * pNumColumns = (volatile ushort *)0x44a;
42 volatile ubyte * pNumRows = (volatile ubyte *)0x484;
43 volatile ushort * pCharHeight = (volatile ushort *)0x485;
44 volatile ushort * pCursorPos = (volatile ushort *)0x450;
45 volatile ushort * pCursorType = (volatile ushort *)0x460;
46 volatile ushort * pTextMemory = (volatile ushort *)0xb8000;
48 typedef struct screen_save {
54 ubyte cursor_x, cursor_y;
55 ubyte cursor_sline, cursor_eline;
56 ushort * video_memory;
59 screen_save gr_saved_screen;
61 int gr_show_screen_info = 0;
62 extern int VGA_current_mode;
64 void gr_set_cellheight( ubyte height )
77 outpw( 0x3c4, 0xE04 ); // enable chain4 mode
78 outpw( 0x3d4, 0x4014 ); // turn on dword mode
79 outpw( 0x3d4, 0xa317 ); // turn off byte mode
84 outpw( 0x3ce, 0x4005 ); // set Shift reg to 1
86 inp( 0x3da ); // dummy input
89 outp( 0x3c0, 0x61 ); // turns on PCS & PCC
91 inp( 0x3da ); // dummy input
97 void gr_turn_screen_off()
104 void gr_turn_screen_on()
111 void gr_set_misc_mode( uint mode )
115 memset( ®s, 0, sizeof(regs) );
117 int386( 0x10, ®s, ®s );
121 void gr_set_3dbios_mode( uint mode )
124 memset( ®s, 0, sizeof(regs) );
126 regs.w.bx = 0x3d00 | (mode & 0xff);
127 int386( 0x10, ®s, ®s );
132 void gr_set_text_25()
137 int386( 0x10, ®s, ®s );
141 void gr_set_text_43()
147 int386( 0x10, ®s, ®s );
150 int386( 0x10, ®s, ®s );
154 int386( 0x10, ®s, ®s );
157 void gr_set_text_50()
163 int386( 0x10, ®s, ®s );
166 int386( 0x10, ®s, ®s );
170 int386( 0x10, ®s, ®s );
173 ubyte is_graphics_mode()
176 tmp = inp( 0x3DA ); // Reset flip-flip
177 outp( 0x3C0, 0x30 ); // Select attr register 10
178 tmp = inp( 0x3C1 ); // Get graphics/text bit
182 void gr_setcursor(ubyte x, ubyte y, ubyte sline, ubyte eline)
186 memset( ®s, 0, sizeof(regs) );
191 int386( 0x10, ®s, ®s );
193 memset( ®s, 0, sizeof(regs) );
195 regs.h.ch = sline & 0xf;
196 regs.h.cl = eline & 0xf;
197 int386( 0x10, ®s, ®s );
200 void gr_getcursor(ubyte *x, ubyte *y, ubyte * sline, ubyte * eline)
204 memset( ®s, 0, sizeof(regs) );
207 int386( 0x10, ®s, ®s );
219 gr_saved_screen.is_graphics = is_graphics_mode();
220 gr_saved_screen.video_mode = *pVideoMode;
222 if (!gr_saved_screen.is_graphics) {
223 gr_saved_screen.width = *pNumColumns;
224 gr_saved_screen.height = *pNumRows+1;
225 gr_saved_screen.char_height = *pCharHeight;
226 gr_getcursor(&gr_saved_screen.cursor_x, &gr_saved_screen.cursor_y, &gr_saved_screen.cursor_sline, &gr_saved_screen.cursor_eline );
227 MALLOC(gr_saved_screen.video_memory,ushort, gr_saved_screen.width*gr_saved_screen.height );
228 for (i=0; i < gr_saved_screen.width*gr_saved_screen.height; i++ )
229 gr_saved_screen.video_memory[i] = pTextMemory[i];
232 if (gr_show_screen_info ) {
233 printf( "Current video mode 0x%x:\n", gr_saved_screen.video_mode );
234 if (gr_saved_screen.is_graphics)
235 printf( "Graphics mode\n" );
237 printf( "Text mode\n" );
238 printf( "( %d columns by %d rows)\n", gr_saved_screen.width, gr_saved_screen.height );
239 printf( "Char height is %d pixel rows\n", gr_saved_screen.char_height );
240 printf( "Cursor of type 0x%x,0x%x is at (%d, %d)\n", gr_saved_screen.cursor_sline, gr_saved_screen.cursor_eline,gr_saved_screen.cursor_x, gr_saved_screen.cursor_y );
251 memset( ®s, 0, sizeof(regs) );
253 int386( 0x10, ®s, ®s );
255 if ( regs.h.al == 0x1a )
261 void gr_restore_mode()
268 gr_palette_fade_out( gr_palette, 32, 0 );
269 gr_palette_set_gamma(0);
270 if ( gr_saved_screen.video_mode == 3 ) {
271 switch( gr_saved_screen.height ) {
272 case 43: gr_set_text_43(); break;
273 case 50: gr_set_text_50(); break;
274 default: gr_set_text_25(); break;
277 gr_set_misc_mode(gr_saved_screen.video_mode);
279 if (gr_saved_screen.is_graphics==0) {
282 gr_palette_read( gr_pal_default );
284 for (i=0; i < gr_saved_screen.width*gr_saved_screen.height; i++ )
285 pTextMemory[i]=gr_saved_screen.video_memory[i];
286 gr_setcursor( gr_saved_screen.cursor_x, gr_saved_screen.cursor_y, gr_saved_screen.cursor_sline, gr_saved_screen.cursor_eline );
287 gr_palette_faded_out = 1;
288 gr_palette_fade_in( gr_pal_default, 32, 0 );
301 if( gr_saved_screen.video_memory ) {
302 free(gr_saved_screen.video_memory);
303 gr_saved_screen.video_memory = NULL;
309 int gr_vesa_setmode( int mode )
313 retcode=gr_vesa_checkmode( mode );
314 if ( retcode ) return retcode;
316 return gr_vesa_setmodea( mode );
321 int gr_set_mode(uint32_t mode)
324 unsigned int w,h,t,data, r;
326 //JOHNgr_disable_default_palette_loading();
334 case SM(320,200)://0:
335 if (!isvga()) return 1;
336 gr_set_misc_mode(0x13);
337 w = 320; r = 320; h = 200; t=BM_LINEAR; data = (int)gr_video_memory;
339 case SM(640,400)://SM_640x400V:
340 retcode = gr_vesa_setmode( 0x100 );
341 if (retcode !=0 ) return retcode;
342 w = 640; r = 640; h = 400; t=BM_SVGA; data = 0;
344 case SM(640,480)://SM_640x480V:
345 retcode = gr_vesa_setmode( 0x101 );
346 if (retcode !=0 ) return retcode;
347 w = 640; r = 640; h = 480; t=BM_SVGA; data = 0;
349 case SM(800,600)://SM_800x600V:
350 retcode = gr_vesa_setmode( 0x103 );
351 if (retcode !=0 ) return retcode;
352 w = 800; r = 800; h = 600; t=BM_SVGA; data = 0;
354 case SM(1024,768)://SM_1024x768V:
355 retcode = gr_vesa_setmode( 0x105 );
356 if (retcode !=0 ) return retcode;
357 w = 1024; r = 1024; h = 768; t=BM_SVGA; data = 0;
359 /* case SM_640x480V15:
360 retcode = gr_vesa_setmode( 0x110 );
361 if (retcode !=0 ) return retcode;
362 w = 640; r = 640*2; h=480; t=BM_SVGA15; data = 0;
365 retcode = gr_vesa_setmode( 0x113 );
366 if (retcode !=0 ) return retcode;
367 w = 800; r = 800*2; h=600; t=BM_SVGA15; data = 0;
371 if (!isvga()) return 1;
372 gr_set_misc_mode(0x13);
379 gr_set_cellheight( 3 );
381 w = 320; r = 320; h = 100; t=BM_LINEAR; data = (int)gr_video_memory;
384 retcode = gr_vesa_setmode( 0x102 );
385 //gr_enable_default_palette_loading();
386 if (retcode !=0 ) return retcode;
389 //gr_set_cellheight( 1 );
390 gr_vesa_setlogical( 400 );
391 w = 400; r = 400; h = 600; t=BM_SVGA; data = 0;
394 if (!isvga()) return 1;
395 gr_set_misc_mode(0xd);
398 gr_set_cellheight( 3 );
399 w = 160; r = 160; h = 100; t=BM_LINEAR; data = (int)gr_video_memory;
401 case //22: // 3dmax 320x400
402 if (!isvga()) return 1;
403 gr_set_3dbios_mode(0x31);
404 //w = 320; r = 320/4; h = 400; t=BM_MODEX; data = 0;
405 w = 320; r = 320; h = 400; t=BM_SVGA; data = 0;
408 if (!isvga()) return 1;
409 if (mode==SM(320,240))
410 w = gr_modex_setmode( 2 );
411 else if (mode==SM(320,400))
412 w = gr_modex_setmode( 6 );
414 Error("unhandled vid mode\n");
415 //gr_enable_default_palette_loading();
416 h = w & 0xffff; w = w >> 16; r = w / 4;t = BM_MODEX; data = 0;
421 memset( grd_curscreen, 0, sizeof(grs_screen));
422 grd_curscreen->sc_mode = mode;
423 grd_curscreen->sc_w = w;
424 grd_curscreen->sc_h = h;
425 grd_curscreen->sc_aspect = fixdiv(grd_curscreen->sc_w*3,grd_curscreen->sc_h*4);
426 grd_curscreen->sc_canvas.cv_bitmap.bm_x = 0;
427 grd_curscreen->sc_canvas.cv_bitmap.bm_y = 0;
428 grd_curscreen->sc_canvas.cv_bitmap.bm_w = w;
429 grd_curscreen->sc_canvas.cv_bitmap.bm_h = h;
430 grd_curscreen->sc_canvas.cv_bitmap.bm_rowsize = r;
431 grd_curscreen->sc_canvas.cv_bitmap.bm_type = t;
432 grd_curscreen->sc_canvas.cv_bitmap.bm_data = (unsigned char *)data;
433 VGA_current_mode = mode;
434 gr_set_current_canvas(NULL);
436 //gr_enable_default_palette_loading();
437 // gamefont_choose_game_font(w,h);
446 int mode = SM(320,200);
448 // Only do this function once!
453 if (!__djgpp_nearptr_enable()) {
454 printf("nearptr enable=%x\n", __dpmi_error);
458 gr_video_memory = (unsigned char *)(__djgpp_conventional_base + 0xa0000);
460 gr_video_memory=(unsigned char *)-1;
462 pVideoMode = (volatile ubyte *)(__djgpp_conventional_base+0x449);
463 pNumColumns = (volatile ushort *)(__djgpp_conventional_base+0x44a);
464 pNumRows = (volatile ubyte *)(__djgpp_conventional_base+0x484);
465 pCharHeight = (volatile ushort *)(__djgpp_conventional_base+0x485);
466 pCursorPos = (volatile ushort *)(__djgpp_conventional_base+0x450);
467 pCursorType = (volatile ushort *)(__djgpp_conventional_base+0x460);
468 pTextMemory = (volatile ushort *)(__djgpp_conventional_base+0xb8000);
475 // Save the current text screen mode
476 if (gr_save_mode()==1)
480 // Save the current palette, and fade it out to black.
481 gr_palette_read( gr_pal_default );
482 gr_palette_faded_out = 0;
483 org_gamma = gr_palette_get_gamma();
484 gr_palette_set_gamma( 0 );
485 gr_palette_fade_out( gr_pal_default, 32, 0 );
487 gr_palette_set_gamma( org_gamma );
494 __djgpp_nearptr_disable();
498 MALLOC( grd_curscreen,grs_screen,1 );
499 memset( grd_curscreen, 0, sizeof(grs_screen));
502 if ((retcode=gr_set_mode(mode)))
507 //JOHNgr_disable_default_palette_loading();
509 // Set all the screen, canvas, and bitmap variables that
510 // aren't set by the gr_set_mode call:
511 grd_curscreen->sc_canvas.cv_color = 0;
512 grd_curscreen->sc_canvas.cv_drawmode = 0;
513 grd_curscreen->sc_canvas.cv_font = NULL;
514 grd_curscreen->sc_canvas.cv_font_fg_color = 0;
515 grd_curscreen->sc_canvas.cv_font_bg_color = 0;
516 gr_set_current_canvas( &grd_curscreen->sc_canvas );
519 if (!dpmi_allocate_selector( &gr_fade_table, 256*GR_FADE_LEVELS, &gr_fade_table_selector ))
520 Error( "Error allocating fade table selector!" );
522 if (!dpmi_allocate_selector( &gr_palette, 256*3, &gr_palette_selector ))
523 Error( "Error allocating palette selector!" );
526 // if (!dpmi_allocate_selector( &gr_inverse_table, 32*32*32, &gr_inverse_table_selector ))
527 // Error( "Error allocating inverse table selector!" );
530 // Set flags indicating that this is installed.
534 atexit((void (*)) gr_close);
541 int gr_mode13_checkmode()
550 // 1=No VGA adapter installed
551 // 2=Program doesn't support this VESA granularity
552 // 3=Monitor doesn't support that VESA mode.:
553 // 4=Video card doesn't support that VESA mode.
554 // 5=No VESA driver found.
555 // 6=Bad Status after VESA call/
556 // 7=Not enough DOS memory to call VESA functions.
557 // 8=Error using DPMI.
558 // 9=Error setting logical line width.
559 // 10=Error allocating selector for A0000h
560 // 11=Not a valid mode support by gr.lib
562 int gr_check_mode(uint32_t mode)
566 case SM(320,100)://19:
578 case SM(376,564): return gr_mode13_checkmode();
579 case SM(640,400): return gr_vesa_checkmode( 0x100 );
580 case SM(640,480): return gr_vesa_checkmode( 0x101 );
581 case SM(800,600): return gr_vesa_checkmode( 0x103 );
582 case SM(1024,768): return gr_vesa_setmode( 0x105 );
583 // case SM_640x480V15: return gr_vesa_setmode( 0x110 );
584 // case SM_800x600V15: return gr_vesa_setmode( 0x113 );
589 /* Palette Stuff Starts Here... */
591 void gr_palette_step_up( int r, int g, int b )
597 if (gr_palette_faded_out) return;
599 if ( (r==last_r) && (g==last_g) && (b==last_b) ) return;
601 last_r = r; last_g = g; last_b = b;
607 for (i=0; i<256; i++ ) {
608 temp = (int)(*p++) + r + gr_palette_gamma;
610 else if (temp>63) temp=63;
612 temp = (int)(*p++) + g + gr_palette_gamma;
614 else if (temp>63) temp=63;
616 temp = (int)(*p++) + b + gr_palette_gamma;
618 else if (temp>63) temp=63;
624 void gr_palette_clear()
629 for (i=0; i<768; i++ ) {
632 gr_palette_faded_out = 1;
635 void gr_palette_load( ubyte * pal )
641 for (i=0; i<768; i++ ) {
642 c = pal[i] + gr_palette_gamma;
643 if ( c > 63 ) c = 63;
645 gr_current_pal[i] = pal[i];
647 gr_palette_faded_out = 0;
649 init_computed_colors();
653 int gr_palette_fade_out(ubyte *pal, int nsteps, int allow_keys )
657 fix fade_palette[768];
658 fix fade_palette_delta[768];
660 if (gr_palette_faded_out) return 0;
663 pal = gr_current_pal;
665 for (i=0; i<768; i++ ) {
666 fade_palette[i] = i2f(pal[i]+gr_palette_gamma);
667 fade_palette_delta[i] = fade_palette[i] / nsteps;
670 for (j=0; j<nsteps; j++ ) {
674 for (i=0; i<768; i++ ) {
675 fade_palette[i] -= fade_palette_delta[i];
676 if (fade_palette[i] < 0 )
678 c = f2i(fade_palette[i]);
679 if ( c > 63 ) c = 63;
683 gr_palette_faded_out = 1;
687 int gr_palette_fade_in(ubyte *pal, int nsteps, int allow_keys)
691 fix fade_palette[768];
692 fix fade_palette_delta[768];
695 if (!gr_palette_faded_out) return 0;
697 for (i=0; i<768; i++ ) {
698 gr_current_pal[i] = pal[i];
700 fade_palette_delta[i] = i2f(pal[i]+gr_palette_gamma) / nsteps;
703 for (j=0; j<nsteps; j++ ) {
707 for (i=0; i<768; i++ ) {
708 fade_palette[i] += fade_palette_delta[i];
709 if (fade_palette[i] > i2f(pal[i]+gr_palette_gamma) )
710 fade_palette[i] = i2f(pal[i]+gr_palette_gamma);
711 c = f2i(fade_palette[i]);
712 if ( c > 63 ) c = 63;
716 gr_palette_faded_out = 0;
720 void gr_palette_read(ubyte * palette)
725 for (i=0; i<768; i++ ) {
726 *palette++ = inp( 0x3c9 );