void
vgahost_shutdown (void)
{
#if defined (SAVE_VGA_STATE)
if (vga_state != NULL)
{
/* Clean up the display, but only if we've done a mode set.
* This makes sure that error messages don't get erased.
*/
if (vga_current_mode != NULL)
restore_vga_state ();
free (vga_state);
vga_state = NULL;
}
#else
if (vga_current_mode != NULL)
restore_vga_state ();
#endif
}
boolean_t
vgahost_init (int max_width, int max_height, int max_bpp, boolean_t fixed_p,
int *argc, char *argv[])
{
int sel;
/* Grab a 64K selector for 0xA000:0000, for the frame buffer. */
sel = __dpmi_segment_to_descriptor (0xA000);
if (sel == -1)
return FALSE;
vga_window_selector = sel;
vga_screen_selector = -1; /* no value yet. */
vesa_version = compute_vesa_version ();
#if defined (SAVE_VGA_STATE)
#if !defined (USE_VESA_STATE_SAVE)
state_glue_funcp = vga_state_glue;
#else /* USE_VESA_STATE_SAVE */
#error "this will break with the mods to try switching to fullscreen and querying VESA version again...we might save the wrong kind of state!"
if (vesa_version >= 0x100) /* version 1.0 or greater? */
state_glue_funcp = vesa_state_glue;
else
state_glue_funcp = vga_state_glue;
#endif /* USE_VESA_STATE_SAVE */
#endif
/* Save the current VGA state, so we can clean up well when we exit. */
save_vga_state ();
/* WinNT appears to not show us a VESA driver unless we start in
* full screen mode. However, if we set a plain VGA graphics mode
* it switches us to full screen mode. If we didn't see a VESA
* driver, this attempts to switch to fullscreen mode and then try
* again.
*/
if (vesa_version == 0 && !only_use_vga_p)
{
__dpmi_regs regs;
dpmi_zero_regs (®s);
regs.x.ax = 0x12; /* 640x480 VGA mode. AH == 0x00. Erase screen. */
if (__dpmi_int (0x10, ®s) == 0)
{
vesa_version = compute_vesa_version ();
restore_vga_state ();
}
}
return TRUE;
}
int set_current_console(int i)
{
if (i < 0 || i >= MAX_OSS) {
return -1;
}
SCR_STATE.current = 0;
save_vga_state(dosemu_regs);
current_console = i;
dosemu_regs = &all_dosemu_regs[current_console];
restore_vga_state(dosemu_regs);
SCR_STATE.current = 1;
return 0;
}
static void restore_current_video(void)
{
if (!config.vga)
return;
/* After all that fun up there, get permissions and save/restore states */
if (video_initialized) {
debug_vid("Restoring dosemu_regs[%d]\n", current_console);
get_perm();
#ifdef WANT_DUMP_VIDEO
dump_video();
#endif
restore_vga_state(dosemu_regs);
}
}
/* Saves the vga state into vga_state, allocating space as necessary. */
static void
save_vga_state (void)
{
__dpmi_regs regs;
/* Fetch the current mode number. */
dpmi_zero_regs (®s);
regs.h.ah = 0xF;
if (__dpmi_int (0x10, ®s) != -1)
orig_vga_mode = regs.h.al & 0x7F;
else
orig_vga_mode = -1;
#if defined (SAVE_VGA_STATE)
if (state_glue_funcp (COMPUTE_BUFFER_SIZE, &vga_state_size)
&& vga_state_size <= DOS_BUF_SIZE - DOS_MIN_STACK_SPACE
&& state_glue_funcp (SAVE_STATE, NULL))
{
if (vga_state != NULL)
free (vga_state);
vga_state = malloc (vga_state_size);
if (vga_state != NULL)
{
/* Save the state away in our memory space. */
movedata (dos_buf_selector, 0, dos_pm_ds, (unsigned) vga_state,
vga_state_size);
}
}
/* Restore the VGA state because many BIOSes corrupt it when they
* save it (from the INTER document). This shouldn't be necessary
* for VESA drivers, but it's conceivable some stupid VESA driver
* calls one of the buggy BIOS routines which is known to need this.
*/
{
int save_orig_mode;
save_orig_mode = orig_vga_mode;
orig_vga_mode = -1; /* Don't reset mode! */
restore_vga_state ();
orig_vga_mode = save_orig_mode;
}
#endif
}
