/* modex_enable_triple_buffer:
* Tries to turn on triple buffering mode, if that is currently possible.
*/
static void modex_enable_triple_buffer(void)
{
if ((!_timer_use_retrace) && (timer_can_simulate_retrace()))
timer_simulate_retrace(TRUE);
if (_timer_use_retrace) {
gfx_modex.request_scroll = request_modex_scroll;
gfx_modex.poll_scroll = poll_modex_scroll;
}
}
/* _set_gfx_mode:
* Called by set_gfx_mode(). Separated to make a clear difference between
* the virtual GFX_SAFE driver and the rest. The allow_config parameter,
* if true, allows the configuration to override the graphics card/driver
* when using GFX_AUTODETECT.
*/
static int _set_gfx_mode(int card, int w, int h, int v_w, int v_h, int allow_config)
{
_DRIVER_INFO *driver_list;
GFX_DRIVER *drv;
char tmp1[64], tmp2[64];
AL_CONST char *dv;
int flags = 0;
int c;
ASSERT(system_driver);
ASSERT(card != GFX_SAFE);
/* remember the current console state */
if (gfx_virgin) {
TRACE(PREFIX_I "First call, remembering console state.\n");
LOCK_FUNCTION(_stub_bank_switch);
LOCK_FUNCTION(blit);
if (system_driver->save_console_state)
system_driver->save_console_state();
_add_exit_func(shutdown_gfx, "shutdown_gfx");
gfx_virgin = FALSE;
}
timer_simulate_retrace(FALSE);
_screen_split_position = 0;
/* close down any existing graphics driver */
if (gfx_driver) {
TRACE(PREFIX_I "Closing graphics driver (%p) ", gfx_driver);
TRACE("%s.\n", gfx_driver->ascii_name);
if (_al_linker_mouse)
_al_linker_mouse->show_mouse(NULL);
while (vram_bitmap_list)
destroy_bitmap(vram_bitmap_list->bmp);
bmp_read_line(screen, 0);
bmp_write_line(screen, 0);
bmp_unwrite_line(screen);
if (gfx_driver->scroll)
gfx_driver->scroll(0, 0);
if (gfx_driver->exit)
gfx_driver->exit(screen);
destroy_bitmap(screen);
gfx_driver = NULL;
screen = NULL;
gfx_capabilities = 0;
}
/* We probably don't want to do this because it makes
* Allegro "forget" the color layout of previously set
* graphics modes. But it should be retained if bitmaps
* created in those modes are to be used in the new mode.
*/
#if 0
/* restore default truecolor pixel format */
_rgb_r_shift_15 = 0;
_rgb_g_shift_15 = 5;
_rgb_b_shift_15 = 10;
_rgb_r_shift_16 = 0;
_rgb_g_shift_16 = 5;
_rgb_b_shift_16 = 11;
_rgb_r_shift_24 = 0;
_rgb_g_shift_24 = 8;
_rgb_b_shift_24 = 16;
_rgb_r_shift_32 = 0;
_rgb_g_shift_32 = 8;
_rgb_b_shift_32 = 16;
_rgb_a_shift_32 = 24;
#endif
gfx_capabilities = 0;
_set_current_refresh_rate(0);
/* return to text mode? */
if (card == GFX_TEXT) {
TRACE(PREFIX_I "Closing, restoring original console state.\n");
if (system_driver->restore_console_state)
system_driver->restore_console_state();
if (_gfx_bank) {
_AL_FREE(_gfx_bank);
_gfx_bank = NULL;
}
TRACE(PREFIX_I "Graphic mode closed.\n");
return 0;
}
/* now to the interesting part: let's try to find a graphics driver */
usetc(allegro_error, 0);
/* ask the system driver for a list of graphics hardware drivers */
if (system_driver->gfx_drivers)
driver_list = system_driver->gfx_drivers();
else
driver_list = _gfx_driver_list;
/* filter specific fullscreen/windowed driver requests */
if (card == GFX_AUTODETECT_FULLSCREEN) {
flags |= GFX_DRIVER_FULLSCREEN_FLAG;
card = GFX_AUTODETECT;
}
else if (card == GFX_AUTODETECT_WINDOWED) {
flags |= GFX_DRIVER_WINDOWED_FLAG;
card = GFX_AUTODETECT;
}
if (card == GFX_AUTODETECT) {
/* autodetect the driver */
int found = FALSE;
tmp1[0] = '\0';
/* first try the config variables */
if (allow_config) {
/* try the gfx_card variable if GFX_AUTODETECT or GFX_AUTODETECT_FULLSCREEN was selected */
if (!(flags & GFX_DRIVER_WINDOWED_FLAG))
found = get_config_gfx_driver(uconvert_ascii("gfx_card", tmp1), w, h, v_w, v_h, flags, driver_list);
/* try the gfx_cardw variable if GFX_AUTODETECT or GFX_AUTODETECT_WINDOWED was selected */
if (!(flags & GFX_DRIVER_FULLSCREEN_FLAG) && !found)
found = get_config_gfx_driver(uconvert_ascii("gfx_cardw", tmp1), w, h, v_w, v_h, flags, driver_list);
}
/* go through the list of autodetected drivers if none was previously found */
if (!found) {
TRACE(PREFIX_I "Autodetecting graphic driver.\n");
for (c=0; driver_list[c].driver; c++) {
if (driver_list[c].autodetect) {
drv = driver_list[c].driver;
if (gfx_driver_is_valid(drv, flags)) {
screen = init_gfx_driver(drv, w, h, v_w, v_h);
if (screen)
break;
}
}
}
}
else {
TRACE(PREFIX_I "GFX_AUTODETECT overridden through configuration:"
" %s.\n", tmp1);
}
}
else {
/* search the list for the requested driver */
drv = get_gfx_driver_from_id(card, driver_list);
if (drv)
screen = init_gfx_driver(drv, w, h, v_w, v_h);
}
/* gracefully handle failure */
if (!screen) {
gfx_driver = NULL; /* set by init_gfx_driver() */
if (!ugetc(allegro_error))
ustrzcpy(allegro_error, ALLEGRO_ERROR_SIZE, get_config_text("Unable to find a suitable graphics driver"));
TRACE(PREFIX_E "Failed setting graphic driver %d.\n", card);
return -1;
}
/* set the basic capabilities of the driver */
if ((VIRTUAL_W > SCREEN_W) || (VIRTUAL_H > SCREEN_H)) {
if (gfx_driver->scroll)
gfx_capabilities |= GFX_CAN_SCROLL;
if ((gfx_driver->request_scroll) || (gfx_driver->request_video_bitmap))
gfx_capabilities |= GFX_CAN_TRIPLE_BUFFER;
}
/* check whether we are instructed to disable vsync */
dv = get_config_string(uconvert_ascii("graphics", tmp1),
uconvert_ascii("disable_vsync", tmp2),
NULL);
if ((dv) && ((c = ugetc(dv)) != 0) && ((c == 'y') || (c == 'Y') || (c == '1')))
_wait_for_vsync = FALSE;
else
_wait_for_vsync = TRUE;
TRACE(PREFIX_I "The driver %s wait for vsync.\n",
(_wait_for_vsync) ? "will" : "won't");
/* Give the gfx driver an opportunity to set the drawing mode */
if ((gfx_driver->drawing_mode) && (!_dispsw_status))
gfx_driver->drawing_mode();
clear_bitmap(screen);
/* set up the default colors */
for (c=0; c<256; c++)
_palette_color8[c] = c;
set_palette(default_palette);
if (_al_linker_mouse)
_al_linker_mouse->set_mouse_etc();
LOCK_DATA(gfx_driver, sizeof(GFX_DRIVER));
_register_switch_bitmap(screen, NULL);
TRACE(PREFIX_I "set_gfx_card success for %dx%dx%d.\n",
screen->w, screen->h, bitmap_color_depth(screen));
return 0;
}
