static bool SDL_AddDisplayMode(SDL_VideoDisplay display, SDL_DisplayMode mode)
{
SDL_DisplayMode[] modes;
int i, nmodes;
// Make sure we don't already have the mode in the list
modes = display.display_modes;
nmodes = display.num_display_modes;
for (i = nmodes; CBool(i--);)
{
if (CompareMemory(mode, modes[i]) == 0)
{
return(false);
}
}
// Go ahead and add the new mode
if (nmodes == display.max_display_modes)
{
modes = Resize(display.display_modes, display.max_display_modes + 32);
display.display_modes = modes;
display.max_display_modes += 32;
}
modes[nmodes] = mode;
display.num_display_modes++;
// Re-sort video modes
Array.Sort(display.display_modes, 0, display.num_display_modes
, Comparer <SDL_DisplayMode> .Create(CompareModes));
return(true);
}
static void SDL_SetDisplayModeForDisplay(SDL_VideoDisplay display, SDL_DisplayMode mode)
{
SDL_DisplayMode display_mode;
SDL_DisplayMode current_mode;
if (mode != null)
{
display_mode = mode.DeepCopy();
// Default to the current mode
if (!CBool(display_mode.format))
{
display_mode.format = display.current_mode.format;
}
if (!CBool(display_mode.w))
{
display_mode.w = display.current_mode.w;
}
if (!CBool(display_mode.h))
{
display_mode.h = display.current_mode.h;
}
if (!CBool(display_mode.refresh_rate))
{
display_mode.refresh_rate = display.current_mode.refresh_rate;
}
// Get a good video mode, the closest one possible
if (SDL_GetClosestDisplayModeForDisplay(display
, display_mode
, display_mode) == null)
{
throw new NativeException("No video mode large enough for {0}x{1}"
, display_mode.w
, display_mode.h);
}
}
else
{
display_mode = display.desktop_mode;
}
// See if there's anything left to do
current_mode = display.current_mode;
if (CompareMemory(display_mode, current_mode) == 0)
{
return;
}
// Actually change the display mode
if (_video.SetDisplayMode == null)
{
throw new NativeException("Video driver doesn't support changing display mode");
}
_video.SetDisplayMode(_video, display, display_mode);
display.current_mode = display_mode;
}
static int CompareMemory(SDL_DisplayMode a, SDL_DisplayMode b)
{
if (a.format != b.format)
{
return((int)(a.format - b.format));
}
if (a.w != b.w)
{
return(a.w - b.w);
}
if (a.h != b.h)
{
return(a.h - b.h);
}
if (a.refresh_rate != b.refresh_rate)
{
return(a.refresh_rate - b.refresh_rate);
}
if (_video.CompareMemory != null)
{
return(_video.CompareMemory(a.driverdata, b.driverdata));
}
return(0);
}
static int CompareModes(SDL_DisplayMode a, SDL_DisplayMode b)
{
if (a.w != b.w)
{
return(b.w - a.w);
}
if (a.h != b.h)
{
return(b.h - a.h);
}
if (SDL_BitsPerPixel(a.format) != SDL_BitsPerPixel(b.format))
{
return((int)(SDL_BitsPerPixel(b.format) - SDL_BitsPerPixel(a.format)));
}
if (SDL_PixelLayout(a.format) != SDL_PixelLayout(b.format))
{
return((int)(SDL_PixelLayout(b.format) - SDL_PixelLayout(a.format)));
}
if (a.refresh_rate != b.refresh_rate)
{
return(b.refresh_rate - a.refresh_rate);// 降序排列
}
return(0);
}
static SDL_DisplayMode SDL_GetClosestDisplayModeForDisplay(
SDL_VideoDisplay display,
SDL_DisplayMode mode,
SDL_DisplayMode closest)
{
uint target_format;
int target_refresh_rate;
int i;
SDL_DisplayMode current, match;
if (CBool(mode) || CBool(closest))
{
throw new NativeException("Missing desired mode or closest mode parameter");
}
// Default to the desktop format
if (CBool(mode.format))
{
target_format = mode.format;
}
else
{
target_format = display.desktop_mode.format;
}
// Default to the desktop refresh rate
if (CBool(mode.refresh_rate))
{
target_refresh_rate = mode.refresh_rate;
}
else
{
target_refresh_rate = display.desktop_mode.refresh_rate;
}
match = null;
for (i = 0; i < SDL_GetNumDisplayModesForDisplay(display); ++i)
{
current = display.display_modes[i];
if (CBool(current.w) && (current.w < mode.w))
{
// Out of sorted modes large enough here
break;
}
if (CBool(current.h) && (current.h < mode.h))
{
if (CBool(current.w) && (current.w == mode.w))
{
// Out of sorted modes large enough here
break;
}
/*
* Wider, but not tall enough, due to a different
* aspect ratio. This mode must be skipped, but closer
* modes may still follow.
*/
continue;
}
if (match == null || current.w < match.w || current.h < match.h)
{
match = current;
continue;
}
if (current.format != match.format)
{
// Sorted highest depth to lowest
if (current.format == target_format ||
(SDL_BitsPerPixel(current.format) >= SDL_BitsPerPixel(target_format) &&
SDL_PixelType(current.format) == SDL_PixelType(target_format))
)
{
match = current;
}
continue;
}
if (current.refresh_rate != match.refresh_rate)
{
// Sorted highest refresh to lowest
if (current.refresh_rate >= target_refresh_rate)
{
match = current;
}
}
}
if (match != null)
{
if (CBool(match.format))
{
closest.format = match.format;
}
else
{
closest.format = mode.format;
}
if (CBool(match.w) && CBool(match.h))
{
closest.w = match.w;
closest.h = match.h;
}
else
{
closest.w = mode.w;
closest.h = mode.h;
}
if (CBool(match.refresh_rate))
{
closest.refresh_rate = match.refresh_rate;
}
else
{
closest.refresh_rate = mode.refresh_rate;
}
closest.driverdata = match.driverdata;
// Pick some reasonable defaults if the app and driver don't care
if (!CBool(closest.format))
{
closest.format = SDL_PIXELFORMAT_RGB888;
}
if (!CBool(closest.w))
{
closest.w = 640;
}
if (!CBool(closest.h))
{
closest.h = 480;
}
return(closest);
}
return(null);
}