+#else
+ video.default_depth = 32; // (how to determine video depth in SDL2?)
+#endif
+}
+
+inline static void SDLInitVideoBuffer_VideoBuffer(boolean fullscreen)
+{
+ if (program.headless)
+ return;
+
+ video.window_scaling_percent = setup.window_scaling_percent;
+ video.window_scaling_quality = setup.window_scaling_quality;
+
+ SDLSetScreenRenderingMode(setup.screen_rendering_mode);
+
+#if defined(TARGET_SDL2)
+ // SDL 2.0: support for (desktop) fullscreen mode available
+ video.fullscreen_available = TRUE;
+#else
+ // SDL 1.2: no support for fullscreen mode in R'n'D anymore
+ video.fullscreen_available = FALSE;
+#endif
+
+ /* open SDL video output device (window or fullscreen mode) */
+ if (!SDLSetVideoMode(fullscreen))
+ Error(ERR_EXIT, "setting video mode failed");
+
+ /* !!! SDL2 can only set the window icon if the window already exists !!! */
+ /* set window icon */
+ SDLSetWindowIcon(program.icon_filename);
+
+ /* set window and icon title */
+ SDLSetWindowTitle();
+}
+
+inline static void SDLInitVideoBuffer_DrawBuffer()
+{
+ /* SDL cannot directly draw to the visible video framebuffer like X11,
+ but always uses a backbuffer, which is then blitted to the visible
+ video framebuffer with 'SDL_UpdateRect' (or replaced with the current
+ visible video framebuffer with 'SDL_Flip', if the hardware supports
+ this). Therefore do not use an additional backbuffer for drawing, but
+ use a symbolic buffer (distinguishable from the SDL backbuffer) called
+ 'window', which indicates that the SDL backbuffer should be updated to
+ the visible video framebuffer when attempting to blit to it.
+
+ For convenience, it seems to be a good idea to create this symbolic
+ buffer 'window' at the same size as the SDL backbuffer. Although it
+ should never be drawn to directly, it would do no harm nevertheless. */
+
+ /* create additional (symbolic) buffer for double-buffering */
+ ReCreateBitmap(&window, video.width, video.height);
+
+ /* create dummy drawing buffer for headless mode, if needed */
+ if (program.headless)
+ ReCreateBitmap(&backbuffer, video.width, video.height);
+}
+
+void SDLInitVideoBuffer(boolean fullscreen)
+{
+ SDLInitVideoBuffer_VideoBuffer(fullscreen);
+ SDLInitVideoBuffer_DrawBuffer();
+}
+
+static boolean SDLCreateScreen(boolean fullscreen)
+{
+ SDL_Surface *new_surface = NULL;
+
+#if defined(TARGET_SDL2)
+ int surface_flags_window = SURFACE_FLAGS | SDL_WINDOW_RESIZABLE;
+ int surface_flags_fullscreen = SURFACE_FLAGS | SDL_WINDOW_FULLSCREEN_DESKTOP;
+#else
+ int surface_flags_window = SURFACE_FLAGS;
+ int surface_flags_fullscreen = SURFACE_FLAGS; // (no fullscreen in SDL 1.2)
+#endif
+
+#if defined(TARGET_SDL2)
+#if 1
+ int renderer_flags = SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE;
+#else
+ /* If SDL_CreateRenderer() is called from within a VirtualBox Windows VM
+ _without_ enabling 2D/3D acceleration and/or guest additions installed,
+ it will crash if flags are *not* set to SDL_RENDERER_SOFTWARE (because
+ it will try to use accelerated graphics and apparently fails miserably) */
+ int renderer_flags = SDL_RENDERER_SOFTWARE;
+#endif
+
+ SDLSetScreenSizeAndOffsets(video.width, video.height);
+#endif
+
+ int width = video.width;
+ int height = video.height;
+ int screen_width = video.screen_width;
+ int screen_height = video.screen_height;
+ int surface_flags = (fullscreen ? surface_flags_fullscreen :
+ surface_flags_window);
+
+ // default window size is unscaled
+ video.window_width = screen_width;
+ video.window_height = screen_height;
+
+#if defined(TARGET_SDL2)
+
+ // store if initial screen mode is fullscreen mode when changing screen size
+ video.fullscreen_initial = fullscreen;
+
+ float window_scaling_factor = (float)setup.window_scaling_percent / 100;
+
+ video.window_width = window_scaling_factor * screen_width;
+ video.window_height = window_scaling_factor * screen_height;
+
+ if (sdl_texture_stream)
+ {
+ SDL_DestroyTexture(sdl_texture_stream);
+ sdl_texture_stream = NULL;
+ }
+
+ if (sdl_texture_target)
+ {
+ SDL_DestroyTexture(sdl_texture_target);
+ sdl_texture_target = NULL;
+ }
+
+ if (!(fullscreen && fullscreen_enabled))
+ {
+ if (sdl_renderer)
+ {
+ SDL_DestroyRenderer(sdl_renderer);
+ sdl_renderer = NULL;
+ }
+
+ if (sdl_window)
+ {
+ SDL_DestroyWindow(sdl_window);
+ sdl_window = NULL;
+ }
+ }
+
+ if (sdl_window == NULL)
+ sdl_window = SDL_CreateWindow(program.window_title,
+ SDL_WINDOWPOS_CENTERED,
+ SDL_WINDOWPOS_CENTERED,
+ video.window_width,
+ video.window_height,
+ surface_flags);
+
+ if (sdl_window != NULL)
+ {
+ if (sdl_renderer == NULL)
+ sdl_renderer = SDL_CreateRenderer(sdl_window, -1, renderer_flags);
+
+ if (sdl_renderer != NULL)
+ {
+ SDL_RenderSetLogicalSize(sdl_renderer, screen_width, screen_height);
+ // SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");
+ SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, setup.window_scaling_quality);
+
+ sdl_texture_stream = SDL_CreateTexture(sdl_renderer,
+ SDL_PIXELFORMAT_ARGB8888,
+ SDL_TEXTUREACCESS_STREAMING,
+ width, height);
+
+ if (SDL_RenderTargetSupported(sdl_renderer))
+ sdl_texture_target = SDL_CreateTexture(sdl_renderer,
+ SDL_PIXELFORMAT_ARGB8888,
+ SDL_TEXTUREACCESS_TARGET,
+ width, height);
+
+ if (sdl_texture_stream != NULL)
+ {
+ // use SDL default values for RGB masks and no alpha channel
+ new_surface = SDL_CreateRGBSurface(0, width, height, 32, 0,0,0, 0);
+
+ if (new_surface == NULL)
+ Error(ERR_WARN, "SDL_CreateRGBSurface() failed: %s", SDL_GetError());
+ }
+ else
+ {
+ Error(ERR_WARN, "SDL_CreateTexture() failed: %s", SDL_GetError());
+ }
+ }
+ else
+ {
+ Error(ERR_WARN, "SDL_CreateRenderer() failed: %s", SDL_GetError());
+ }
+ }
+ else
+ {
+ Error(ERR_WARN, "SDL_CreateWindow() failed: %s", SDL_GetError());
+ }
+
+#else // TARGET_SDL
+
+ if (gfx.final_screen_bitmap == NULL)
+ gfx.final_screen_bitmap = CreateBitmapStruct();
+
+ gfx.final_screen_bitmap->width = width;
+ gfx.final_screen_bitmap->height = height;
+
+ gfx.final_screen_bitmap->surface =
+ SDL_SetVideoMode(width, height, video.depth, surface_flags);
+
+ if (gfx.final_screen_bitmap->surface != NULL)
+ {
+ new_surface =
+ SDL_CreateRGBSurface(surface_flags, width, height, video.depth, 0,0,0, 0);
+
+ if (new_surface == NULL)
+ Error(ERR_WARN, "SDL_CreateRGBSurface() failed: %s", SDL_GetError());
+
+#if 0
+ new_surface = gfx.final_screen_bitmap->surface;
+ gfx.final_screen_bitmap = NULL;
+#endif
+
+ }
+ else
+ {
+ Error(ERR_WARN, "SDL_SetVideoMode() failed: %s", SDL_GetError());
+ }
+#endif
+
+#if defined(TARGET_SDL2)
+ // store fullscreen state ("video.fullscreen_enabled" may not reflect this!)
+ if (new_surface != NULL)
+ fullscreen_enabled = fullscreen;
+#endif
+
+ if (backbuffer == NULL)
+ backbuffer = CreateBitmapStruct();
+
+ backbuffer->width = video.width;
+ backbuffer->height = video.height;
+
+ if (backbuffer->surface)
+ SDL_FreeSurface(backbuffer->surface);
+
+ backbuffer->surface = new_surface;
+
+ return (new_surface != NULL);
+}
+
+boolean SDLSetVideoMode(boolean fullscreen)
+{
+ boolean success = FALSE;
+
+ SetWindowTitle();
+
+ if (fullscreen && !video.fullscreen_enabled && video.fullscreen_available)
+ {
+ /* switch display to fullscreen mode, if available */
+ success = SDLCreateScreen(TRUE);
+
+ if (!success)
+ {
+ /* switching display to fullscreen mode failed -- do not try it again */
+ video.fullscreen_available = FALSE;
+ }
+ else
+ {
+ video.fullscreen_enabled = TRUE;
+ }
+ }
+
+ if ((!fullscreen && video.fullscreen_enabled) || !success)
+ {
+ /* switch display to window mode */
+ success = SDLCreateScreen(FALSE);
+
+ if (!success)
+ {
+ /* switching display to window mode failed -- should not happen */
+ }
+ else
+ {
+ video.fullscreen_enabled = FALSE;
+ video.window_scaling_percent = setup.window_scaling_percent;
+ video.window_scaling_quality = setup.window_scaling_quality;
+
+ SDLSetScreenRenderingMode(setup.screen_rendering_mode);
+ }
+ }
+
+#if defined(TARGET_SDL2)
+ SDLRedrawWindow(); // map window
+#endif
+
+#ifdef DEBUG
+#if defined(PLATFORM_WIN32)
+ // experimental drag and drop code
+
+ SDL_EventState(SDL_SYSWMEVENT, SDL_ENABLE);
+
+ {
+ SDL_SysWMinfo wminfo;
+ HWND hwnd;
+ boolean wminfo_success = FALSE;
+
+ SDL_VERSION(&wminfo.version);
+#if defined(TARGET_SDL2)
+ if (sdl_window)
+ wminfo_success = SDL_GetWindowWMInfo(sdl_window, &wminfo);
+#else
+ wminfo_success = (SDL_GetWMInfo(&wminfo) == 1);
+#endif
+
+ if (wminfo_success)
+ {
+#if defined(TARGET_SDL2)
+ hwnd = wminfo.info.win.window;
+#else
+ hwnd = wminfo.window;
+#endif
+
+ DragAcceptFiles(hwnd, TRUE);
+ }
+ }
+#endif
+#endif
+
+ return success;
+}
+
+void SDLSetWindowTitle()
+{
+#if defined(TARGET_SDL2)
+ if (sdl_window == NULL)
+ return;
+
+ SDL_SetWindowTitle(sdl_window, program.window_title);
+#else
+ SDL_WM_SetCaption(program.window_title, program.window_title);
+#endif