rnd-20001130-1-src

[rocksndiamonds.git] / src / sdl.c

diff --git a/src/sdl.c b/src/sdl.c
index f3846da7491d6862b55416414cab925328575252..6e4b781b0df5a63cbdfa5ffb73ebaf448e5f1605 100644 (file)
--- a/src/sdl.c
+++ b/src/sdl.c
@@ -12,11 +12,108 @@
 *  sdl.c                                                   *
 ***********************************************************/
 
-#ifdef USE_SDL_LIBRARY
+#ifdef TARGET_SDL
 
 #include "main.h"
 #include "misc.h"
 
+inline void SDLInitBufferedDisplay(DrawBuffer *backbuffer, DrawWindow *window)
+{
+  /* initialize SDL video */
+  if (SDL_Init(SDL_INIT_VIDEO) < 0)
+    Error(ERR_EXIT, "SDL_Init() failed: %s", SDL_GetError());
+
+  /* automatically cleanup SDL stuff after exit() */
+  atexit(SDL_Quit);
+
+  /* open SDL video output device (window or fullscreen mode) */
+  if (!SDLSetVideoMode(backbuffer))
+    Error(ERR_EXIT, "setting video mode failed");
+
+  /* set window and icon title */
+  SDL_WM_SetCaption(WINDOW_TITLE_STRING, WINDOW_TITLE_STRING);
+
+  /* create additional buffer for double-buffering */
+  pix[PIX_DB_BACK] = CreateBitmap(WIN_XSIZE, WIN_YSIZE, DEFAULT_DEPTH);
+
+  /* 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. */
+
+  *window = pix[PIX_DB_BACK];          /* 'window' is only symbolic buffer */
+  pix[PIX_DB_BACK] = *backbuffer;      /* 'backbuffer' is SDL screen buffer */
+}
+
+inline boolean SDLSetVideoMode(DrawBuffer *backbuffer)
+{
+  boolean success = TRUE;
+
+  if (setup.fullscreen && !fullscreen_enabled && fullscreen_available)
+  {
+    /* switch display to fullscreen mode, if available */
+    DrawWindow window_old = *backbuffer;
+    DrawWindow window_new;
+
+    if ((window_new = SDL_SetVideoMode(WIN_XSIZE, WIN_YSIZE, WIN_SDL_DEPTH,
+                                      SDL_HWSURFACE|SDL_FULLSCREEN))
+       == NULL)
+    {
+      /* switching display to fullscreen mode failed */
+      Error(ERR_WARN, "SDL_SetVideoMode() failed: %s", SDL_GetError());
+
+      /* do not try it again */
+      fullscreen_available = FALSE;
+      success = FALSE;
+    }
+    else
+    {
+      if (window_old)
+       SDL_FreeSurface(window_old);
+      *backbuffer = window_new;
+
+      fullscreen_enabled = TRUE;
+      success = TRUE;
+    }
+  }
+
+  if ((!setup.fullscreen && fullscreen_enabled) || !*backbuffer)
+  {
+    /* switch display to window mode */
+    DrawWindow window_old = *backbuffer;
+    DrawWindow window_new;
+
+    if ((window_new = SDL_SetVideoMode(WIN_XSIZE, WIN_YSIZE, WIN_SDL_DEPTH,
+                                      SDL_HWSURFACE))
+       == NULL)
+    {
+      /* switching display to window mode failed -- should not happen */
+      Error(ERR_WARN, "SDL_SetVideoMode() failed: %s", SDL_GetError());
+
+      success = FALSE;
+    }
+    else
+    {
+      if (window_old)
+       SDL_FreeSurface(window_old);
+      *backbuffer = window_new;
+
+      fullscreen_enabled = FALSE;
+      success = TRUE;
+    }
+  }
+
+  return success;
+}
+
 inline void SDLCopyArea(SDL_Surface *src_surface, SDL_Surface *dst_surface,
                        int src_x, int src_y,
                        int width, int height,
@@ -86,4 +183,32 @@ inline void SDLDrawSimpleLine(SDL_Surface *surface, int from_x, int from_y,
                SDL_MapRGB(surface->format, color_r, color_g, color_b));
 }
 
-#endif /* USE_SDL_LIBRARY */
+inline boolean SDLOpenAudio(void)
+{
+  if (SDL_Init(SDL_INIT_AUDIO) < 0)
+  {
+    Error(ERR_WARN, "SDL_Init() failed: %s", SDL_GetError());
+    return FALSE;
+  }
+
+  if (Mix_OpenAudio(22050, AUDIO_S16, 2, 512) < 0)
+  {
+    Error(ERR_WARN, "Mix_OpenAudio() failed: %s", SDL_GetError());
+    return FALSE;
+  }
+
+  Mix_Volume(-1, SDL_MIX_MAXVOLUME / 4);
+  Mix_VolumeMusic(SDL_MIX_MAXVOLUME / 4);
+
+  return TRUE;
+}
+
+inline void SDLCloseAudio(void)
+{
+  Mix_HaltMusic();
+  Mix_HaltChannel(-1);
+
+  Mix_CloseAudio();
+}
+
+#endif /* TARGET_SDL */