X-Git-Url: https://git.artsoft.org/?p=rocksndiamonds.git;a=blobdiff_plain;f=src%2Flibgame%2Fsdl.c;h=9a7717532e47970827dc679dc546f27873babcc1;hp=48a3e374ec39f5a64796bee38fb02b072137ca9a;hb=1f8fd7a79343ce670dc62fcb8be48ba78d0c9199;hpb=522cba3565ad60664933d454f83518961deb41c5

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index 48a3e374..9a771753 100644
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -17,6 +17,8 @@
 
 #define ENABLE_UNUSED_CODE	0	/* currently unused functions */
 
+#define DEBUG_JOYSTICKS		0
+
 
 /* ========================================================================= */
 /* video functions                                                           */
@@ -37,6 +39,11 @@ static boolean limit_screen_updates = FALSE;
 /* functions from SGE library */
 void sge_Line(SDL_Surface *, Sint16, Sint16, Sint16, Sint16, Uint32);
 
+#if defined(USE_TOUCH_INPUT_OVERLAY)
+/* functions to draw overlay graphics for touch device input */
+static void DrawTouchInputOverlay();
+#endif
+
 void SDLLimitScreenUpdates(boolean enable)
 {
   limit_screen_updates = enable;
@@ -55,6 +62,10 @@ static void FinalizeScreen(int draw_target)
   // copy global animations to render target buffer, if defined (above border)
   if (gfx.draw_global_anim_function != NULL)
     gfx.draw_global_anim_function(draw_target, DRAW_GLOBAL_ANIM_STAGE_2);
+
+  // copy tile selection cursor to render target buffer, if defined (above all)
+  if (gfx.draw_tile_cursor_function != NULL)
+    gfx.draw_tile_cursor_function(draw_target);
 }
 
 static void UpdateScreenExt(SDL_Rect *rect, boolean with_frame_delay)
@@ -129,6 +140,56 @@ static void UpdateScreenExt(SDL_Rect *rect, boolean with_frame_delay)
     SDL_UpdateTexture(sdl_texture, NULL, screen->pixels, screen->pitch);
   }
 
+  int xoff = video.screen_xoffset;
+  int yoff = video.screen_yoffset;
+  SDL_Rect dst_rect_screen = { xoff, yoff, video.width, video.height };
+  SDL_Rect *src_rect1 = NULL, *dst_rect1 = NULL;
+  SDL_Rect *src_rect2 = NULL, *dst_rect2 = NULL;
+
+  if (video.screen_rendering_mode == SPECIAL_RENDERING_TARGET ||
+      video.screen_rendering_mode == SPECIAL_RENDERING_DOUBLE)
+    dst_rect2 = &dst_rect_screen;
+  else
+    dst_rect1 = &dst_rect_screen;
+
+#if defined(HAS_SCREEN_KEYBOARD)
+  if (video.shifted_up || video.shifted_up_delay)
+  {
+    int time_current = SDL_GetTicks();
+    int pos = video.shifted_up_pos;
+    int pos_last = video.shifted_up_pos_last;
+
+    if (!DelayReachedExt(&video.shifted_up_delay, video.shifted_up_delay_value,
+			 time_current))
+    {
+      int delay = time_current - video.shifted_up_delay;
+      int delay_value = video.shifted_up_delay_value;
+
+      pos = pos_last + (pos - pos_last) * delay / delay_value;
+    }
+    else
+    {
+      video.shifted_up_pos_last = pos;
+      video.shifted_up_delay = 0;
+    }
+
+    SDL_Rect src_rect_up = { 0,    pos,  video.width, video.height - pos };
+    SDL_Rect dst_rect_up = { xoff, yoff, video.width, video.height - pos };
+
+    if (video.screen_rendering_mode == SPECIAL_RENDERING_TARGET ||
+	video.screen_rendering_mode == SPECIAL_RENDERING_DOUBLE)
+    {
+      src_rect2 = &src_rect_up;
+      dst_rect2 = &dst_rect_up;
+    }
+    else
+    {
+      src_rect1 = &src_rect_up;
+      dst_rect1 = &dst_rect_up;
+    }
+  }
+#endif
+
   // clear render target buffer
   SDL_RenderClear(sdl_renderer);
 
@@ -139,7 +200,7 @@ static void UpdateScreenExt(SDL_Rect *rect, boolean with_frame_delay)
 
   // copy backbuffer texture to render target buffer
   if (video.screen_rendering_mode != SPECIAL_RENDERING_TARGET)
-    SDL_RenderCopy(sdl_renderer, sdl_texture_stream, NULL, NULL);
+    SDL_RenderCopy(sdl_renderer, sdl_texture_stream, src_rect1, dst_rect1);
 
   if (video.screen_rendering_mode != SPECIAL_RENDERING_BITMAP)
     FinalizeScreen(DRAW_TO_SCREEN);
@@ -149,8 +210,14 @@ static void UpdateScreenExt(SDL_Rect *rect, boolean with_frame_delay)
       video.screen_rendering_mode == SPECIAL_RENDERING_DOUBLE)
   {
     SDL_SetRenderTarget(sdl_renderer, NULL);
-    SDL_RenderCopy(sdl_renderer, sdl_texture_target, NULL, NULL);
+    SDL_RenderCopy(sdl_renderer, sdl_texture_target, src_rect2, dst_rect2);
   }
+
+#if defined(USE_TOUCH_INPUT_OVERLAY)
+  // draw overlay graphics for touch device input, if needed
+  DrawTouchInputOverlay();
+#endif
+
 #endif
 
   // global synchronization point of the game to align video frame delay
@@ -178,6 +245,20 @@ static void UpdateScreen_WithoutFrameDelay(SDL_Rect *rect)
   UpdateScreenExt(rect, FALSE);
 }
 
+void Delay_WithScreenUpdates(unsigned int delay)
+{
+  unsigned int time_current = SDL_GetTicks();
+  unsigned int time_delayed = time_current + delay;
+
+  while (time_current < time_delayed)
+  {
+    // updating the screen contains waiting for frame delay (non-busy)
+    UpdateScreen_WithFrameDelay(NULL);
+
+    time_current = SDL_GetTicks();
+  }
+}
+
 static void SDLSetWindowIcon(char *basename)
 {
   /* (setting the window icon on Mac OS X would replace the high-quality
@@ -223,34 +304,40 @@ static boolean equalSDLPixelFormat(SDL_PixelFormat *format1,
 	  format1->BytesPerPixel == format2->BytesPerPixel &&
 	  format1->Rmask	 == format2->Rmask &&
 	  format1->Gmask	 == format2->Gmask &&
-	  format1->Bmask	 == format2->Bmask &&
-	  format1->Amask	 == format2->Amask);
+	  format1->Bmask	 == format2->Bmask);
 }
 
-boolean SDLSetNativeSurface(SDL_Surface **surface)
+static Pixel SDLGetColorKey(SDL_Surface *surface)
 {
-  SDL_Surface *new_surface;
+  Pixel color_key;
 
-  if (surface == NULL ||
-      *surface == NULL ||
-      backbuffer == NULL ||
-      backbuffer->surface == NULL)
-    return FALSE;
+  if (SDL_GetColorKey(surface, &color_key) != 0)
+    return -1;
 
-  // if pixel format already optimized for destination surface, do nothing
-  if (equalSDLPixelFormat((*surface)->format, backbuffer->surface->format))
-    return FALSE;
+  return color_key;
+}
 
-  new_surface = SDL_ConvertSurface(*surface, backbuffer->surface->format, 0);
+static boolean SDLHasColorKey(SDL_Surface *surface)
+{
+  return (SDLGetColorKey(surface) != -1);
+}
 
-  if (new_surface == NULL)
-    Error(ERR_EXIT, "SDL_ConvertSurface() failed: %s", SDL_GetError());
+static boolean SDLHasAlpha(SDL_Surface *surface)
+{
+  SDL_BlendMode blend_mode;
 
-  SDL_FreeSurface(*surface);
+  if (SDL_GetSurfaceBlendMode(surface, &blend_mode) != 0)
+    return FALSE;
 
-  *surface = new_surface;
+  return (blend_mode == SDL_BLENDMODE_BLEND);
+}
 
-  return TRUE;
+static void SDLSetAlpha(SDL_Surface *surface, boolean set, int alpha)
+{
+  SDL_BlendMode blend_mode = (set ? SDL_BLENDMODE_BLEND : SDL_BLENDMODE_NONE);
+
+  SDL_SetSurfaceBlendMode(surface, blend_mode);
+  SDL_SetSurfaceAlphaMod(surface, alpha);
 }
 
 SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
@@ -279,21 +366,21 @@ SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
   return new_surface;
 }
 
-#else
-
 boolean SDLSetNativeSurface(SDL_Surface **surface)
 {
   SDL_Surface *new_surface;
 
   if (surface == NULL ||
       *surface == NULL ||
-      !video.initialized)
+      backbuffer == NULL ||
+      backbuffer->surface == NULL)
     return FALSE;
 
-  new_surface = SDL_DisplayFormat(*surface);
+  // if pixel format already optimized for destination surface, do nothing
+  if (equalSDLPixelFormat((*surface)->format, backbuffer->surface->format))
+    return FALSE;
 
-  if (new_surface == NULL)
-    Error(ERR_EXIT, "SDL_DisplayFormat() failed: %s", SDL_GetError());
+  new_surface = SDLGetNativeSurface(*surface);
 
   SDL_FreeSurface(*surface);
 
@@ -302,14 +389,44 @@ boolean SDLSetNativeSurface(SDL_Surface **surface)
   return TRUE;
 }
 
+#else
+
+static Pixel SDLGetColorKey(SDL_Surface *surface)
+{
+  if ((surface->flags & SDL_SRCCOLORKEY) == 0)
+    return -1;
+
+  return surface->format->colorkey;
+}
+
+static boolean SDLHasColorKey(SDL_Surface *surface)
+{
+  return (SDLGetColorKey(surface) != -1);
+}
+
+static boolean SDLHasAlpha(SDL_Surface *surface)
+{
+  return ((surface->flags & SDL_SRCALPHA) != 0);
+}
+
+static void SDLSetAlpha(SDL_Surface *surface, boolean set, int alpha)
+{
+  SDL_SetAlpha(surface, (set ? SDL_SRCALPHA : 0), alpha);
+}
+
 SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
 {
   SDL_Surface *new_surface;
 
-  if (video.initialized)
-    new_surface = SDL_DisplayFormat(surface);
-  else
+  if (surface == NULL)
+    return NULL;
+
+  if (!video.initialized)
     new_surface = SDL_ConvertSurface(surface, surface->format, SURFACE_FLAGS);
+  else if (SDLHasAlpha(surface))
+    new_surface = SDL_DisplayFormatAlpha(surface);
+  else
+    new_surface = SDL_DisplayFormat(surface);
 
   if (new_surface == NULL)
     Error(ERR_EXIT, "%s() failed: %s",
@@ -319,11 +436,32 @@ SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
   return new_surface;
 }
 
+boolean SDLSetNativeSurface(SDL_Surface **surface)
+{
+  SDL_Surface *new_surface;
+
+  if (surface == NULL ||
+      *surface == NULL ||
+      !video.initialized)
+    return FALSE;
+
+  new_surface = SDLGetNativeSurface(*surface);
+
+  SDL_FreeSurface(*surface);
+
+  *surface = new_surface;
+
+  return TRUE;
+}
+
 #endif
 
 #if defined(TARGET_SDL2)
 static SDL_Texture *SDLCreateTextureFromSurface(SDL_Surface *surface)
 {
+  if (program.headless)
+    return NULL;
+
   SDL_Texture *texture = SDL_CreateTextureFromSurface(sdl_renderer, surface);
 
   if (texture == NULL)
@@ -387,8 +525,11 @@ void SDLInitVideoDisplay(void)
 #endif
 }
 
-void SDLInitVideoBuffer(boolean fullscreen)
+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;
 
@@ -411,12 +552,11 @@ void SDLInitVideoBuffer(boolean fullscreen)
   SDLSetWindowIcon(program.icon_filename);
 
   /* set window and icon title */
-#if defined(TARGET_SDL2)
-  SDL_SetWindowTitle(sdl_window, program.window_title);
-#else
-  SDL_WM_SetCaption(program.window_title, program.window_title);
-#endif
+  SDLSetWindowTitle();
+}
 
+static void SDLInitVideoBuffer_DrawBuffer(void)
+{
   /* 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
@@ -431,7 +571,17 @@ void SDLInitVideoBuffer(boolean fullscreen)
      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, video.depth);
+  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)
@@ -456,16 +606,20 @@ static boolean SDLCreateScreen(boolean fullscreen)
      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  = video.width;
-  video.window_height = video.height;
+  video.window_width  = screen_width;
+  video.window_height = screen_height;
 
 #if defined(TARGET_SDL2)
 
@@ -474,8 +628,8 @@ static boolean SDLCreateScreen(boolean fullscreen)
 
   float window_scaling_factor = (float)setup.window_scaling_percent / 100;
 
-  video.window_width  = window_scaling_factor * width;
-  video.window_height = window_scaling_factor * height;
+  video.window_width  = window_scaling_factor * screen_width;
+  video.window_height = window_scaling_factor * screen_height;
 
   if (sdl_texture_stream)
   {
@@ -519,10 +673,12 @@ static boolean SDLCreateScreen(boolean fullscreen)
 
     if (sdl_renderer != NULL)
     {
-      SDL_RenderSetLogicalSize(sdl_renderer, width, height);
+      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);
 
+      SDLSetScreenVsyncMode(setup.vsync_mode);
+
       sdl_texture_stream = SDL_CreateTexture(sdl_renderer,
 					     SDL_PIXELFORMAT_ARGB8888,
 					     SDL_TEXTUREACCESS_STREAMING,
@@ -689,9 +845,12 @@ boolean SDLSetVideoMode(boolean fullscreen)
   return success;
 }
 
-void SDLSetWindowTitle()
+void SDLSetWindowTitle(void)
 {
 #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);
@@ -705,8 +864,8 @@ void SDLSetWindowScaling(int window_scaling_percent)
     return;
 
   float window_scaling_factor = (float)window_scaling_percent / 100;
-  int new_window_width  = (int)(window_scaling_factor * video.width);
-  int new_window_height = (int)(window_scaling_factor * video.height);
+  int new_window_width  = (int)(window_scaling_factor * video.screen_width);
+  int new_window_height = (int)(window_scaling_factor * video.screen_height);
 
   SDL_SetWindowSize(sdl_window, new_window_width, new_window_height);
 
@@ -778,6 +937,67 @@ void SDLSetWindowFullscreen(boolean fullscreen)
     video.fullscreen_initial = FALSE;
   }
 }
+
+void SDLSetDisplaySize(void)
+{
+  SDL_Rect display_bounds;
+
+  SDL_GetDisplayBounds(0, &display_bounds);
+
+  video.display_width  = display_bounds.w;
+  video.display_height = display_bounds.h;
+
+#if 0
+  Error(ERR_DEBUG, "SDL real screen size: %d x %d",
+	video.display_width, video.display_height);
+#endif
+}
+
+void SDLSetScreenSizeAndOffsets(int width, int height)
+{
+  // set default video screen size and offsets
+  video.screen_width = width;
+  video.screen_height = height;
+  video.screen_xoffset = 0;
+  video.screen_yoffset = 0;
+
+#if defined(USE_COMPLETE_DISPLAY)
+  float ratio_video   = (float) width / height;
+  float ratio_display = (float) video.display_width / video.display_height;
+
+  if (ratio_video != ratio_display)
+  {
+    // adjust drawable screen size to cover the whole device display
+
+    if (ratio_video < ratio_display)
+      video.screen_width  *= ratio_display / ratio_video;
+    else
+      video.screen_height *= ratio_video / ratio_display;
+
+    video.screen_xoffset = (video.screen_width  - width)  / 2;
+    video.screen_yoffset = (video.screen_height - height) / 2;
+
+#if 0
+    Error(ERR_DEBUG, "Changing screen from %dx%d to %dx%d (%.2f to %.2f)",
+	  width, height,
+	  video.screen_width, video.screen_height,
+	  ratio_video, ratio_display);
+#endif
+  }
+#endif
+}
+
+void SDLSetScreenSizeForRenderer(int width, int height)
+{
+  SDL_RenderSetLogicalSize(sdl_renderer, width, height);
+}
+
+void SDLSetScreenProperties(void)
+{
+  SDLSetScreenSizeAndOffsets(video.width, video.height);
+  SDLSetScreenSizeForRenderer(video.screen_width, video.screen_height);
+}
+
 #endif
 
 void SDLSetScreenRenderingMode(char *screen_rendering_mode)
@@ -795,7 +1015,22 @@ void SDLSetScreenRenderingMode(char *screen_rendering_mode)
 #endif
 }
 
-void SDLRedrawWindow()
+void SDLSetScreenVsyncMode(char *vsync_mode)
+{
+#if defined(TARGET_SDL2)
+  int interval =
+    (strEqual(vsync_mode, STR_VSYNC_MODE_NORMAL)   ? VSYNC_MODE_NORMAL :
+     strEqual(vsync_mode, STR_VSYNC_MODE_ADAPTIVE) ? VSYNC_MODE_ADAPTIVE :
+     VSYNC_MODE_OFF);
+  int result = SDL_GL_SetSwapInterval(interval);
+
+  // if adaptive vsync requested, but not supported, retry with normal vsync
+  if (result == -1 && interval == VSYNC_MODE_ADAPTIVE)
+    SDL_GL_SetSwapInterval(VSYNC_MODE_NORMAL);
+#endif
+}
+
+void SDLRedrawWindow(void)
 {
   UpdateScreen_WithoutFrameDelay(NULL);
 }
@@ -803,6 +1038,9 @@ void SDLRedrawWindow()
 void SDLCreateBitmapContent(Bitmap *bitmap, int width, int height,
 			    int depth)
 {
+  if (program.headless)
+    return;
+
   SDL_Surface *surface =
     SDL_CreateRGBSurface(SURFACE_FLAGS, width, height, depth, 0,0,0, 0);
 
@@ -924,7 +1162,7 @@ void PrepareFadeBitmap(int draw_target)
   FinalizeScreen(draw_target);
 }
 
-void SDLFadeRectangle(Bitmap *bitmap_cross, int x, int y, int width, int height,
+void SDLFadeRectangle(int x, int y, int width, int height,
 		      int fade_mode, int fade_delay, int post_delay,
 		      void (*draw_border_function)(void))
 {
@@ -992,11 +1230,8 @@ void SDLFadeRectangle(Bitmap *bitmap_cross, int x, int y, int width, int height,
     int i;
 
     SDL_BlitSurface(surface_source, &src_rect, surface_screen, &dst_rect);
-#if defined(TARGET_SDL2)
-    SDL_SetSurfaceBlendMode(surface_target, SDL_BLENDMODE_NONE);
-#else
-    SDL_SetAlpha(surface_target, 0, 0);		/* disable alpha blending */
-#endif
+
+    SDLSetAlpha(surface_target, FALSE, 0);	/* disable alpha blending */
 
     ypos[0] = -GetSimpleRandom(16);
 
@@ -1109,11 +1344,8 @@ void SDLFadeRectangle(Bitmap *bitmap_cross, int x, int y, int width, int height,
     int xx_size = width / 2;
 
     SDL_BlitSurface(surface_target, &src_rect, surface_screen, &dst_rect);
-#if defined(TARGET_SDL2)
-    SDL_SetSurfaceBlendMode(surface_source, SDL_BLENDMODE_NONE);
-#else
-    SDL_SetAlpha(surface_source, 0, 0);		/* disable alpha blending */
-#endif
+
+    SDLSetAlpha(surface_source, FALSE, 0);	/* disable alpha blending */
 
     for (xx = 0; xx < xx_size;)
     {
@@ -1176,12 +1408,7 @@ void SDLFadeRectangle(Bitmap *bitmap_cross, int x, int y, int width, int height,
       SDL_BlitSurface(surface_source, &src_rect, surface_screen, &dst_rect);
 
       /* draw new (target) image to screen buffer using alpha blending */
-#if defined(TARGET_SDL2)
-      SDL_SetSurfaceAlphaMod(surface_target, alpha_final);
-      SDL_SetSurfaceBlendMode(surface_target, SDL_BLENDMODE_BLEND);
-#else
-      SDL_SetAlpha(surface_target, SDL_SRCALPHA, alpha_final);
-#endif
+      SDLSetAlpha(surface_target, TRUE, alpha_final);
       SDL_BlitSurface(surface_target, &src_rect, surface_screen, &dst_rect);
 
       if (draw_border_function != NULL)
@@ -1193,20 +1420,7 @@ void SDLFadeRectangle(Bitmap *bitmap_cross, int x, int y, int width, int height,
   }
 
   if (post_delay > 0)
-  {
-    unsigned int time_post_delay;
-
-    time_current = SDL_GetTicks();
-    time_post_delay = time_current + post_delay;
-
-    while (time_current < time_post_delay)
-    {
-      // updating the screen contains waiting for frame delay (non-busy)
-      UpdateScreen_WithFrameDelay(NULL);
-
-      time_current = SDL_GetTicks();
-    }
-  }
+    Delay_WithScreenUpdates(post_delay);
 
   // restore function for drawing global masked border
   gfx.draw_global_border_function = draw_global_border_function;
@@ -1325,7 +1539,7 @@ Pixel SDLGetPixel(Bitmap *src_bitmap, int x, int y)
 /* http://www.etek.chalmers.se/~e8cal1/sge/index.html                        */
 /* ========================================================================= */
 
-void _PutPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
+static void _PutPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
 {
   if (x >= 0 && x <= surface->w - 1 && y >= 0 && y <= surface->h - 1)
   {
@@ -1372,23 +1586,24 @@ void _PutPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
   }
 }
 
-void _PutPixelRGB(SDL_Surface *surface, Sint16 x, Sint16 y,
-		  Uint8 R, Uint8 G, Uint8 B)
+#if 0
+static void _PutPixelRGB(SDL_Surface *surface, Sint16 x, Sint16 y,
+			 Uint8 R, Uint8 G, Uint8 B)
 {
   _PutPixel(surface, x, y, SDL_MapRGB(surface->format, R, G, B));
 }
 
-void _PutPixel8(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
+static void _PutPixel8(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
 {
   *((Uint8 *)surface->pixels + y*surface->pitch + x) = color;
 }
 
-void _PutPixel16(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
+static void _PutPixel16(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
 {
   *((Uint16 *)surface->pixels + y*surface->pitch/2 + x) = color;
 }
 
-void _PutPixel24(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
+static void _PutPixel24(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
 {
   Uint8 *pix;
   int shift;
@@ -1403,12 +1618,12 @@ void _PutPixel24(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
   *(pix+shift/8) = color>>shift;
 }
 
-void _PutPixel32(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
+static void _PutPixel32(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
 {
   *((Uint32 *)surface->pixels + y*surface->pitch/4 + x) = color;
 }
 
-void _PutPixelX(SDL_Surface *dest,Sint16 x,Sint16 y,Uint32 color)
+static void _PutPixelX(SDL_Surface *dest,Sint16 x,Sint16 y,Uint32 color)
 {
   switch (dest->format->BytesPerPixel)
   {
@@ -1429,8 +1644,9 @@ void _PutPixelX(SDL_Surface *dest,Sint16 x,Sint16 y,Uint32 color)
       break;
   }
 }
+#endif
 
-void sge_PutPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
+static void sge_PutPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
 {
   if (SDL_MUSTLOCK(surface))
   {
@@ -1448,13 +1664,14 @@ void sge_PutPixel(SDL_Surface *surface, Sint16 x, Sint16 y, Uint32 color)
   }
 }
 
-void sge_PutPixelRGB(SDL_Surface *surface, Sint16 x, Sint16 y,
-		  Uint8 r, Uint8 g, Uint8 b)
+#if 0
+static void sge_PutPixelRGB(SDL_Surface *surface, Sint16 x, Sint16 y,
+			    Uint8 r, Uint8 g, Uint8 b)
 {
   sge_PutPixel(surface, x, y, SDL_MapRGB(surface->format, r, g, b));
 }
 
-Sint32 sge_CalcYPitch(SDL_Surface *dest, Sint16 y)
+static Sint32 sge_CalcYPitch(SDL_Surface *dest, Sint16 y)
 {
   if (y >= 0 && y <= dest->h - 1)
   {
@@ -1481,7 +1698,8 @@ Sint32 sge_CalcYPitch(SDL_Surface *dest, Sint16 y)
   return -1;
 }
 
-void sge_pPutPixel(SDL_Surface *surface, Sint16 x, Sint32 ypitch, Uint32 color)
+static void sge_pPutPixel(SDL_Surface *surface, Sint16 x, Sint32 ypitch,
+			  Uint32 color)
 {
   if (x >= 0 && x <= surface->w - 1 && ypitch >= 0)
   {
@@ -1528,8 +1746,8 @@ void sge_pPutPixel(SDL_Surface *surface, Sint16 x, Sint32 ypitch, Uint32 color)
   }
 }
 
-void sge_HLine(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y,
-	       Uint32 Color)
+static void sge_HLine(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y,
+		      Uint32 Color)
 {
   SDL_Rect l;
 
@@ -1569,13 +1787,14 @@ void sge_HLine(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y,
   }
 }
 
-void sge_HLineRGB(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y,
-		  Uint8 R, Uint8 G, Uint8 B)
+static void sge_HLineRGB(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y,
+			 Uint8 R, Uint8 G, Uint8 B)
 {
   sge_HLine(Surface, x1, x2, y, SDL_MapRGB(Surface->format, R, G, B));
 }
 
-void _HLine(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y, Uint32 Color)
+static void _HLine(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y,
+		   Uint32 Color)
 {
   SDL_Rect l;
 
@@ -1602,8 +1821,8 @@ void _HLine(SDL_Surface *Surface, Sint16 x1, Sint16 x2, Sint16 y, Uint32 Color)
   SDL_FillRect(Surface, &l, Color);
 }
 
-void sge_VLine(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2,
-	       Uint32 Color)
+static void sge_VLine(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2,
+		      Uint32 Color)
 {
   SDL_Rect l;
 
@@ -1643,13 +1862,14 @@ void sge_VLine(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2,
   }
 }
 
-void sge_VLineRGB(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2,
-		  Uint8 R, Uint8 G, Uint8 B)
+static void sge_VLineRGB(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2,
+			 Uint8 R, Uint8 G, Uint8 B)
 {
   sge_VLine(Surface, x, y1, y2, SDL_MapRGB(Surface->format, R, G, B));
 }
 
-void _VLine(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2, Uint32 Color)
+static void _VLine(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2,
+		   Uint32 Color)
 {
   SDL_Rect l;
 
@@ -1675,11 +1895,12 @@ void _VLine(SDL_Surface *Surface, Sint16 x, Sint16 y1, Sint16 y2, Uint32 Color)
 
   SDL_FillRect(Surface, &l, Color);
 }
+#endif
 
-void sge_DoLine(SDL_Surface *Surface, Sint16 x1, Sint16 y1,
-		Sint16 x2, Sint16 y2, Uint32 Color,
-		void Callback(SDL_Surface *Surf, Sint16 X, Sint16 Y,
-			      Uint32 Color))
+static void sge_DoLine(SDL_Surface *Surface, Sint16 x1, Sint16 y1,
+		       Sint16 x2, Sint16 y2, Uint32 Color,
+		       void Callback(SDL_Surface *Surf, Sint16 X, Sint16 Y,
+				     Uint32 Color))
 {
   Sint16 dx, dy, sdx, sdy, x, y, px, py;
 
@@ -1731,14 +1952,16 @@ void sge_DoLine(SDL_Surface *Surface, Sint16 x1, Sint16 y1,
   }
 }
 
-void sge_DoLineRGB(SDL_Surface *Surface, Sint16 X1, Sint16 Y1,
-		   Sint16 X2, Sint16 Y2, Uint8 R, Uint8 G, Uint8 B,
-		   void Callback(SDL_Surface *Surf, Sint16 X, Sint16 Y,
-				 Uint32 Color))
+#if 0
+static void sge_DoLineRGB(SDL_Surface *Surface, Sint16 X1, Sint16 Y1,
+			  Sint16 X2, Sint16 Y2, Uint8 R, Uint8 G, Uint8 B,
+			  void Callback(SDL_Surface *Surf, Sint16 X, Sint16 Y,
+					Uint32 Color))
 {
   sge_DoLine(Surface, X1, Y1, X2, Y2,
 	     SDL_MapRGB(Surface->format, R, G, B), Callback);
 }
+#endif
 
 void sge_Line(SDL_Surface *Surface, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2,
 	      Uint32 Color)
@@ -1759,11 +1982,13 @@ void sge_Line(SDL_Surface *Surface, Sint16 x1, Sint16 y1, Sint16 x2, Sint16 y2,
    }
 }
 
-void sge_LineRGB(SDL_Surface *Surface, Sint16 x1, Sint16 y1, Sint16 x2,
-		 Sint16 y2, Uint8 R, Uint8 G, Uint8 B)
+#if 0
+static void sge_LineRGB(SDL_Surface *Surface, Sint16 x1, Sint16 y1, Sint16 x2,
+			Sint16 y2, Uint8 R, Uint8 G, Uint8 B)
 {
   sge_Line(Surface, x1, y1, x2, y2, SDL_MapRGB(Surface->format, R, G, B));
 }
+#endif
 
 void SDLPutPixel(Bitmap *dst_bitmap, int x, int y, Pixel pixel)
 {
@@ -1834,7 +2059,7 @@ typedef struct
   Uint8 a;
 } tColorRGBA;
 
-int zoomSurfaceRGBA_scaleDownBy2(SDL_Surface *src, SDL_Surface *dst)
+static int zoomSurfaceRGBA_scaleDownBy2(SDL_Surface *src, SDL_Surface *dst)
 {
   int x, y;
   tColorRGBA *sp, *csp, *dp;
@@ -1885,7 +2110,7 @@ int zoomSurfaceRGBA_scaleDownBy2(SDL_Surface *src, SDL_Surface *dst)
   return 0;
 }
 
-int zoomSurfaceRGBA(SDL_Surface *src, SDL_Surface *dst)
+static int zoomSurfaceRGBA(SDL_Surface *src, SDL_Surface *dst)
 {
   int x, y, *sax, *say, *csax, *csay;
   float sx, sy;
@@ -1958,7 +2183,7 @@ int zoomSurfaceRGBA(SDL_Surface *src, SDL_Surface *dst)
   -----------------------------------------------------------------------------
 */
 
-int zoomSurfaceY(SDL_Surface * src, SDL_Surface * dst)
+static int zoomSurfaceY(SDL_Surface * src, SDL_Surface * dst)
 {
   Uint32 x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy;
   Uint8 *sp, *dp, *csp;
@@ -2058,7 +2283,7 @@ int zoomSurfaceY(SDL_Surface * src, SDL_Surface * dst)
   -----------------------------------------------------------------------------
 */
 
-SDL_Surface *zoomSurface(SDL_Surface *src, int dst_width, int dst_height)
+static SDL_Surface *zoomSurface(SDL_Surface *src, int dst_width, int dst_height)
 {
   SDL_Surface *zoom_src = NULL;
   SDL_Surface *zoom_dst = NULL;
@@ -2081,7 +2306,8 @@ SDL_Surface *zoomSurface(SDL_Surface *src, int dst_width, int dst_height)
   {
     /* new source surface is 32 bit with a defined RGB ordering */
     zoom_src = SDL_CreateRGBSurface(SURFACE_FLAGS, src->w, src->h, 32,
-				    0x000000ff, 0x0000ff00, 0x00ff0000, 0);
+				    0x000000ff, 0x0000ff00, 0x00ff0000,
+				    (src->format->Amask ? 0xff000000 : 0));
     SDL_BlitSurface(src, NULL, zoom_src, NULL);
     is_32bit = TRUE;
     is_converted = TRUE;
@@ -2094,7 +2320,8 @@ SDL_Surface *zoomSurface(SDL_Surface *src, int dst_width, int dst_height)
     zoom_dst = SDL_CreateRGBSurface(SURFACE_FLAGS, dst_width, dst_height, 32,
 				    zoom_src->format->Rmask,
 				    zoom_src->format->Gmask,
-				    zoom_src->format->Bmask, 0);
+				    zoom_src->format->Bmask,
+				    zoom_src->format->Amask);
   }
   else
   {
@@ -2135,10 +2362,30 @@ SDL_Surface *zoomSurface(SDL_Surface *src, int dst_width, int dst_height)
   return zoom_dst;
 }
 
+static SDL_Surface *SDLGetOpaqueSurface(SDL_Surface *surface)
+{
+  SDL_Surface *new_surface;
+
+  if (surface == NULL)
+    return NULL;
+
+  if ((new_surface = SDLGetNativeSurface(surface)) == NULL)
+    Error(ERR_EXIT, "SDLGetNativeSurface() failed");
+
+  /* remove alpha channel from native non-transparent surface, if defined */
+  SDLSetAlpha(new_surface, FALSE, 0);
+
+  /* remove transparent color from native non-transparent surface, if defined */
+  SDL_SetColorKey(new_surface, UNSET_TRANSPARENT_PIXEL, 0);
+
+  return new_surface;
+}
+
 Bitmap *SDLZoomBitmap(Bitmap *src_bitmap, int dst_width, int dst_height)
 {
   Bitmap *dst_bitmap = CreateBitmapStruct();
-  SDL_Surface **dst_surface = &dst_bitmap->surface;
+  SDL_Surface *src_surface = src_bitmap->surface_masked;
+  SDL_Surface *dst_surface;
 
   dst_width  = MAX(1, dst_width);	/* prevent zero bitmap width */
   dst_height = MAX(1, dst_height);	/* prevent zero bitmap height */
@@ -2147,10 +2394,21 @@ Bitmap *SDLZoomBitmap(Bitmap *src_bitmap, int dst_width, int dst_height)
   dst_bitmap->height = dst_height;
 
   /* create zoomed temporary surface from source surface */
-  *dst_surface = zoomSurface(src_bitmap->surface, dst_width, dst_height);
+  dst_surface = zoomSurface(src_surface, dst_width, dst_height);
 
   /* create native format destination surface from zoomed temporary surface */
-  SDLSetNativeSurface(dst_surface);
+  SDLSetNativeSurface(&dst_surface);
+
+  /* set color key for zoomed surface from source surface, if defined */
+  if (SDLHasColorKey(src_surface))
+    SDL_SetColorKey(dst_surface, SET_TRANSPARENT_PIXEL,
+		    SDLGetColorKey(src_surface));
+
+  /* create native non-transparent surface for opaque blitting */
+  dst_bitmap->surface = SDLGetOpaqueSurface(dst_surface);
+
+  /* set native transparent surface for masked blitting */
+  dst_bitmap->surface_masked = dst_surface;
 
   return dst_bitmap;
 }
@@ -2165,47 +2423,45 @@ Bitmap *SDLLoadImage(char *filename)
   Bitmap *new_bitmap = CreateBitmapStruct();
   SDL_Surface *sdl_image_tmp;
 
+  if (program.headless)
+  {
+    /* prevent sanity check warnings at later stage */
+    new_bitmap->width = new_bitmap->height = 1;
+
+    return new_bitmap;
+  }
+
   print_timestamp_init("SDLLoadImage");
 
   print_timestamp_time(getBaseNamePtr(filename));
 
   /* load image to temporary surface */
   if ((sdl_image_tmp = IMG_Load(filename)) == NULL)
-  {
-    SetError("IMG_Load(): %s", SDL_GetError());
-
-    return NULL;
-  }
+    Error(ERR_EXIT, "IMG_Load() failed: %s", SDL_GetError());
 
   print_timestamp_time("IMG_Load");
 
   UPDATE_BUSY_STATE();
 
   /* create native non-transparent surface for current image */
-  if ((new_bitmap->surface = SDLGetNativeSurface(sdl_image_tmp)) == NULL)
-  {
-    SetError("SDL_DisplayFormat(): %s", SDL_GetError());
-
-    return NULL;
-  }
+  if ((new_bitmap->surface = SDLGetOpaqueSurface(sdl_image_tmp)) == NULL)
+    Error(ERR_EXIT, "SDLGetOpaqueSurface() failed");
 
-  print_timestamp_time("SDL_DisplayFormat (opaque)");
+  print_timestamp_time("SDLGetNativeSurface (opaque)");
 
   UPDATE_BUSY_STATE();
 
-  /* create native transparent surface for current image */
-  if (sdl_image_tmp->format->Amask == 0)
+  /* set black pixel to transparent if no alpha channel / transparent color */
+  if (!SDLHasAlpha(sdl_image_tmp) &&
+      !SDLHasColorKey(sdl_image_tmp))
     SDL_SetColorKey(sdl_image_tmp, SET_TRANSPARENT_PIXEL,
 		    SDL_MapRGB(sdl_image_tmp->format, 0x00, 0x00, 0x00));
 
+  /* create native transparent surface for current image */
   if ((new_bitmap->surface_masked = SDLGetNativeSurface(sdl_image_tmp)) == NULL)
-  {
-    SetError("SDL_DisplayFormat(): %s", SDL_GetError());
+    Error(ERR_EXIT, "SDLGetNativeSurface() failed");
 
-    return NULL;
-  }
-
-  print_timestamp_time("SDL_DisplayFormat (masked)");
+  print_timestamp_time("SDLGetNativeSurface (masked)");
 
   UPDATE_BUSY_STATE();
 
@@ -2264,6 +2520,9 @@ void SDLSetMouseCursor(struct MouseCursorInfo *cursor_info)
 
 void SDLOpenAudio(void)
 {
+  if (program.headless)
+    return;
+
 #if !defined(TARGET_SDL2)
   if (!strEqual(setup.system.sdl_audiodriver, ARG_DEFAULT))
     SDL_putenv(getStringCat2("SDL_AUDIODRIVER=", setup.system.sdl_audiodriver));
@@ -2310,7 +2569,7 @@ void SDLCloseAudio(void)
 /* event functions                                                           */
 /* ========================================================================= */
 
-void SDLNextEvent(Event *event)
+void SDLWaitEvent(Event *event)
 {
   SDL_WaitEvent(event);
 }
@@ -2366,31 +2625,83 @@ void SDLHandleWindowManagerEvent(Event *event)
 /* joystick functions                                                        */
 /* ========================================================================= */
 
-static SDL_Joystick *sdl_joystick[MAX_PLAYERS] = { NULL, NULL, NULL, NULL };
-static int sdl_js_axis[MAX_PLAYERS][2]   = { {0, 0}, {0, 0}, {0, 0}, {0, 0} };
-static int sdl_js_button[MAX_PLAYERS][2] = { {0, 0}, {0, 0}, {0, 0}, {0, 0} };
+#if defined(TARGET_SDL2)
+static void *sdl_joystick[MAX_PLAYERS];		// game controller or joystick
+#else
+static SDL_Joystick *sdl_joystick[MAX_PLAYERS];	// only joysticks supported
+#endif
+static int sdl_js_axis_raw[MAX_PLAYERS][2];
+static int sdl_js_axis[MAX_PLAYERS][2];
+static int sdl_js_button[MAX_PLAYERS][2];
+static boolean sdl_is_controller[MAX_PLAYERS];
 
-static boolean SDLOpenJoystick(int nr)
+void SDLClearJoystickState(void)
 {
-  if (nr < 0 || nr > MAX_PLAYERS)
+  int i, j;
+
+  for (i = 0; i < MAX_PLAYERS; i++)
+  {
+    for (j = 0; j < 2; j++)
+    {
+      sdl_js_axis_raw[i][j] = -1;
+      sdl_js_axis[i][j] = 0;
+      sdl_js_button[i][j] = 0;
+    }
+  }
+}
+
+boolean SDLOpenJoystick(int nr)
+{
+  if (nr < 0 || nr >= MAX_PLAYERS)
     return FALSE;
 
-  return ((sdl_joystick[nr] = SDL_JoystickOpen(nr)) == NULL ? FALSE : TRUE);
+#if defined(TARGET_SDL2)
+  sdl_is_controller[nr] = SDL_IsGameController(nr);
+#else
+  sdl_is_controller[nr] = FALSE;
+#endif
+
+#if DEBUG_JOYSTICKS
+  Error(ERR_DEBUG, "opening joystick %d (%s)",
+	nr, (sdl_is_controller[nr] ? "game controller" : "joystick"));
+#endif
+
+#if defined(TARGET_SDL2)
+  if (sdl_is_controller[nr])
+    sdl_joystick[nr] = SDL_GameControllerOpen(nr);
+  else
+    sdl_joystick[nr] = SDL_JoystickOpen(nr);
+#else
+  sdl_joystick[nr] = SDL_JoystickOpen(nr);
+#endif
+
+  return (sdl_joystick[nr] != NULL);
 }
 
-static void SDLCloseJoystick(int nr)
+void SDLCloseJoystick(int nr)
 {
-  if (nr < 0 || nr > MAX_PLAYERS)
+  if (nr < 0 || nr >= MAX_PLAYERS)
     return;
 
+#if DEBUG_JOYSTICKS
+  Error(ERR_DEBUG, "closing joystick %d", nr);
+#endif
+
+#if defined(TARGET_SDL2)
+  if (sdl_is_controller[nr])
+    SDL_GameControllerClose(sdl_joystick[nr]);
+  else
+    SDL_JoystickClose(sdl_joystick[nr]);
+#else
   SDL_JoystickClose(sdl_joystick[nr]);
+#endif
 
   sdl_joystick[nr] = NULL;
 }
 
-static boolean SDLCheckJoystickOpened(int nr)
+boolean SDLCheckJoystickOpened(int nr)
 {
-  if (nr < 0 || nr > MAX_PLAYERS)
+  if (nr < 0 || nr >= MAX_PLAYERS)
     return FALSE;
 
 #if defined(TARGET_SDL2)
@@ -2400,23 +2711,164 @@ static boolean SDLCheckJoystickOpened(int nr)
 #endif
 }
 
+static void setJoystickAxis(int nr, int axis_id_raw, int axis_value)
+{
+#if defined(TARGET_SDL2)
+  int axis_id = (axis_id_raw == SDL_CONTROLLER_AXIS_LEFTX ||
+		 axis_id_raw == SDL_CONTROLLER_AXIS_RIGHTX ? 0 :
+		 axis_id_raw == SDL_CONTROLLER_AXIS_LEFTY ||
+		 axis_id_raw == SDL_CONTROLLER_AXIS_RIGHTY ? 1 : -1);
+#else
+  int axis_id = axis_id_raw % 2;
+#endif
+
+  if (nr < 0 || nr >= MAX_PLAYERS)
+    return;
+
+  if (axis_id == -1)
+    return;
+
+  // prevent (slightly jittering, but centered) axis A from resetting axis B
+  if (ABS(axis_value) < JOYSTICK_PERCENT * JOYSTICK_MAX_AXIS_POS / 100 &&
+      axis_id_raw != sdl_js_axis_raw[nr][axis_id])
+    return;
+
+  sdl_js_axis[nr][axis_id] = axis_value;
+  sdl_js_axis_raw[nr][axis_id] = axis_id_raw;
+}
+
+static void setJoystickButton(int nr, int button_id_raw, int button_state)
+{
+#if defined(TARGET_SDL2)
+  int button_id = (button_id_raw == SDL_CONTROLLER_BUTTON_A ||
+		   button_id_raw == SDL_CONTROLLER_BUTTON_X ||
+		   button_id_raw == SDL_CONTROLLER_BUTTON_LEFTSHOULDER ||
+		   button_id_raw == SDL_CONTROLLER_BUTTON_LEFTSTICK ||
+		   button_id_raw == SDL_CONTROLLER_BUTTON_RIGHTSTICK ? 0 :
+		   button_id_raw == SDL_CONTROLLER_BUTTON_B ||
+		   button_id_raw == SDL_CONTROLLER_BUTTON_Y ||
+		   button_id_raw == SDL_CONTROLLER_BUTTON_RIGHTSHOULDER ? 1 :
+		   -1);
+
+  if (button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_LEFT)
+    sdl_js_axis[nr][0] = button_state * JOYSTICK_XLEFT;
+  else if (button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_RIGHT)
+    sdl_js_axis[nr][0] = button_state * JOYSTICK_XRIGHT;
+  else if (button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_UP)
+    sdl_js_axis[nr][1] = button_state * JOYSTICK_YUPPER;
+  else if (button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_DOWN)
+    sdl_js_axis[nr][1] = button_state * JOYSTICK_YLOWER;
+
+  if (button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_LEFT ||
+      button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_RIGHT ||
+      button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_UP ||
+      button_id_raw == SDL_CONTROLLER_BUTTON_DPAD_DOWN)
+    sdl_js_axis_raw[nr][0] = sdl_js_axis_raw[nr][1] = -1;
+#else
+  int button_id = button_id_raw % 2;
+#endif
+
+  if (nr < 0 || nr >= MAX_PLAYERS)
+    return;
+
+  if (button_id == -1)
+    return;
+
+  sdl_js_button[nr][button_id] = button_state;
+}
+
 void HandleJoystickEvent(Event *event)
 {
   switch(event->type)
   {
+#if defined(TARGET_SDL2)
+    case SDL_CONTROLLERDEVICEADDED:
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_CONTROLLERDEVICEADDED: device %d added",
+	    event->cdevice.which);
+#endif
+      InitJoysticks();
+      break;
+
+    case SDL_CONTROLLERDEVICEREMOVED:
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_CONTROLLERDEVICEREMOVED: device %d removed",
+	    event->cdevice.which);
+#endif
+      InitJoysticks();
+      break;
+
+    case SDL_CONTROLLERAXISMOTION:
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_CONTROLLERAXISMOTION: device %d, axis %d: %d",
+	    event->caxis.which, event->caxis.axis, event->caxis.value);
+#endif
+      setJoystickAxis(event->caxis.which,
+		      event->caxis.axis,
+		      event->caxis.value);
+      break;
+
+    case SDL_CONTROLLERBUTTONDOWN:
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_CONTROLLERBUTTONDOWN: device %d, button %d",
+	    event->cbutton.which, event->cbutton.button);
+#endif
+      setJoystickButton(event->cbutton.which,
+			event->cbutton.button,
+			TRUE);
+      break;
+
+    case SDL_CONTROLLERBUTTONUP:
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_CONTROLLERBUTTONUP: device %d, button %d",
+	    event->cbutton.which, event->cbutton.button);
+#endif
+      setJoystickButton(event->cbutton.which,
+			event->cbutton.button,
+			FALSE);
+      break;
+#endif
+
     case SDL_JOYAXISMOTION:
-      if (event->jaxis.axis < 2)
-	sdl_js_axis[event->jaxis.which][event->jaxis.axis]= event->jaxis.value;
+      if (sdl_is_controller[event->jaxis.which])
+	break;
+
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_JOYAXISMOTION: device %d, axis %d: %d",
+	    event->jaxis.which, event->jaxis.axis, event->jaxis.value);
+#endif
+      if (event->jaxis.axis < 4)
+	setJoystickAxis(event->jaxis.which,
+			event->jaxis.axis,
+			event->jaxis.value);
       break;
 
     case SDL_JOYBUTTONDOWN:
-      if (event->jbutton.button < 2)
-	sdl_js_button[event->jbutton.which][event->jbutton.button] = TRUE;
+      if (sdl_is_controller[event->jaxis.which])
+	break;
+
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_JOYBUTTONDOWN: device %d, button %d",
+	    event->jbutton.which, event->jbutton.button);
+#endif
+      if (event->jbutton.button < 4)
+	setJoystickButton(event->jbutton.which,
+			  event->jbutton.button,
+			  TRUE);
       break;
 
     case SDL_JOYBUTTONUP:
-      if (event->jbutton.button < 2)
-	sdl_js_button[event->jbutton.which][event->jbutton.button] = FALSE;
+      if (sdl_is_controller[event->jaxis.which])
+	break;
+
+#if DEBUG_JOYSTICKS
+      Error(ERR_DEBUG, "SDL_JOYBUTTONUP: device %d, button %d",
+	    event->jbutton.which, event->jbutton.button);
+#endif
+      if (event->jbutton.button < 4)
+	setJoystickButton(event->jbutton.which,
+			  event->jbutton.button,
+			  FALSE);
       break;
 
     default:
@@ -2424,23 +2876,85 @@ void HandleJoystickEvent(Event *event)
   }
 }
 
-void SDLInitJoysticks()
+void SDLInitJoysticks(void)
 {
   static boolean sdl_joystick_subsystem_initialized = FALSE;
   boolean print_warning = !sdl_joystick_subsystem_initialized;
+#if defined(TARGET_SDL2)
+  char *mappings_file_base = getPath2(options.conf_directory,
+				      GAMECONTROLLER_BASENAME);
+  char *mappings_file_user = getPath2(getUserGameDataDir(),
+				      GAMECONTROLLER_BASENAME);
+  int num_mappings;
+#endif
   int i;
 
   if (!sdl_joystick_subsystem_initialized)
   {
     sdl_joystick_subsystem_initialized = TRUE;
 
+#if defined(TARGET_SDL2)
+    SDL_SetHint(SDL_HINT_ACCELEROMETER_AS_JOYSTICK, "0");
+
+    if (SDL_InitSubSystem(SDL_INIT_GAMECONTROLLER) < 0)
+#else
     if (SDL_InitSubSystem(SDL_INIT_JOYSTICK) < 0)
+#endif
     {
       Error(ERR_EXIT, "SDL_Init() failed: %s", SDL_GetError());
       return;
     }
+
+#if defined(TARGET_SDL2)
+    num_mappings = SDL_GameControllerAddMappingsFromFile(mappings_file_base);
+
+    /* the included game controller base mappings should always be found */
+    if (num_mappings == -1)
+      Error(ERR_WARN, "no game controller base mappings found");
+#if DEBUG_JOYSTICKS
+    else
+      Error(ERR_INFO, "%d game controller base mapping(s) added", num_mappings);
+#endif
+
+    num_mappings = SDL_GameControllerAddMappingsFromFile(mappings_file_user);
+
+#if DEBUG_JOYSTICKS
+    /* the personal game controller user mappings may or may not be found */
+    if (num_mappings == -1)
+      Error(ERR_WARN, "no game controller user mappings found");
+    else
+      Error(ERR_INFO, "%d game controller user mapping(s) added", num_mappings);
+
+    Error(ERR_INFO, "%d joystick(s) found:", SDL_NumJoysticks());
+#endif
+
+    checked_free(mappings_file_base);
+    checked_free(mappings_file_user);
+
+#if DEBUG_JOYSTICKS
+    for (i = 0; i < SDL_NumJoysticks(); i++)
+    {
+      const char *name, *type;
+
+      if (SDL_IsGameController(i))
+      {
+	name = SDL_GameControllerNameForIndex(i);
+	type = "game controller";
+      }
+      else
+      {
+	name = SDL_JoystickNameForIndex(i);
+	type = "joystick";
+      }
+
+      Error(ERR_INFO, "- joystick %d (%s): '%s'",
+	    i, type, (name ? name : "(Unknown)"));
+    }
+#endif
+#endif
   }
 
+  /* assign joysticks from configured to connected joystick for all players */
   for (i = 0; i < MAX_PLAYERS; i++)
   {
     /* get configured joystick for this player */
@@ -2455,29 +2969,24 @@ void SDLInitJoysticks()
       joystick_nr = -1;
     }
 
-    /* misuse joystick file descriptor variable to store joystick number */
-    joystick.fd[i] = joystick_nr;
-
-    if (joystick_nr == -1)
-      continue;
+    /* store configured joystick number for each player */
+    joystick.nr[i] = joystick_nr;
+  }
 
+  /* now open all connected joysticks (regardless if configured or not) */
+  for (i = 0; i < SDL_NumJoysticks(); i++)
+  {
     /* this allows subsequent calls to 'InitJoysticks' for re-initialization */
-    if (SDLCheckJoystickOpened(joystick_nr))
-      SDLCloseJoystick(joystick_nr);
-
-    if (!setup.input[i].use_joystick)
-      continue;
-
-    if (!SDLOpenJoystick(joystick_nr))
-    {
-      if (print_warning)
-	Error(ERR_WARN, "cannot open joystick %d", joystick_nr);
-
-      continue;
-    }
+    if (SDLCheckJoystickOpened(i))
+      SDLCloseJoystick(i);
 
-    joystick.status = JOYSTICK_ACTIVATED;
+    if (SDLOpenJoystick(i))
+      joystick.status = JOYSTICK_ACTIVATED;
+    else if (print_warning)
+      Error(ERR_WARN, "cannot open joystick %d", i);
   }
+
+  SDLClearJoystickState();
 }
 
 boolean SDLReadJoystick(int nr, int *x, int *y, boolean *b1, boolean *b2)
@@ -2497,3 +3006,285 @@ boolean SDLReadJoystick(int nr, int *x, int *y, boolean *b1, boolean *b2)
 
   return TRUE;
 }
+
+
+/* ========================================================================= */
+/* touch input overlay functions                                             */
+/* ========================================================================= */
+
+#if defined(USE_TOUCH_INPUT_OVERLAY)
+static void DrawTouchInputOverlay_ShowGrid(int alpha)
+{
+  SDL_Rect rect;
+  int grid_xsize = overlay.grid_xsize;
+  int grid_ysize = overlay.grid_ysize;
+  int x, y;
+
+  SDL_SetRenderDrawColor(sdl_renderer, 255, 255, 255, alpha);
+  SDL_SetRenderDrawBlendMode(sdl_renderer, SDL_BLENDMODE_BLEND);
+
+  for (x = 0; x < grid_xsize; x++)
+  {
+    rect.x = (x + 0) * video.screen_width / grid_xsize;
+    rect.w = (x + 1) * video.screen_width / grid_xsize - rect.x;
+
+    for (y = 0; y < grid_ysize; y++)
+    {
+      rect.y = (y + 0) * video.screen_height / grid_ysize;
+      rect.h = (y + 1) * video.screen_height / grid_ysize - rect.y;
+
+      if (overlay.grid_button[x][y] == CHAR_GRID_BUTTON_NONE)
+	SDL_RenderDrawRect(sdl_renderer, &rect);
+    }
+  }
+
+  SDL_SetRenderDrawColor(sdl_renderer, 0, 0, 0, 255);
+}
+
+static void RenderFillRectangle(int x, int y, int width, int height)
+{
+  SDL_Rect rect = { x, y, width, height };
+
+  SDL_RenderFillRect(sdl_renderer, &rect);
+}
+
+static void DrawTouchInputOverlay_ShowGridButtons(int alpha)
+{
+  static int alpha_direction = 0;
+  static int alpha_highlight = 0;
+  int alpha_max = ALPHA_FROM_TRANSPARENCY(setup.touch.transparency);
+  int alpha_step = ALPHA_FADING_STEPSIZE(alpha_max);
+  SDL_Rect rect;
+  int grid_xsize = overlay.grid_xsize;
+  int grid_ysize = overlay.grid_ysize;
+  int x, y;
+
+  if (alpha == alpha_max)
+  {
+    if (alpha_direction < 0)
+    {
+      alpha_highlight = MAX(0, alpha_highlight - alpha_step);
+
+      if (alpha_highlight == 0)
+	alpha_direction = 1;
+    }
+    else
+    {
+      alpha_highlight = MIN(alpha_highlight + alpha_step, alpha_max);
+
+      if (alpha_highlight == alpha_max)
+	alpha_direction = -1;
+    }
+  }
+  else
+  {
+    alpha_direction = 1;
+    alpha_highlight = alpha;
+  }
+
+  SDL_SetRenderDrawBlendMode(sdl_renderer, SDL_BLENDMODE_BLEND);
+
+  for (x = 0; x < grid_xsize; x++)
+  {
+    for (y = 0; y < grid_ysize; y++)
+    {
+      int grid_button = overlay.grid_button[x][y];
+      int grid_button_action = GET_ACTION_FROM_GRID_BUTTON(grid_button);
+      int alpha_draw = alpha;
+      int outline_border = MV_NONE;
+      int border_size = 2;
+      boolean draw_outlined = setup.touch.draw_outlined;
+      boolean draw_pressed = setup.touch.draw_pressed;
+
+      if (grid_button == CHAR_GRID_BUTTON_NONE)
+	continue;
+
+      if (grid_button == overlay.grid_button_highlight)
+	alpha_draw = alpha_highlight;
+
+      if (draw_pressed && overlay.grid_button_action & grid_button_action)
+      {
+	if (draw_outlined)
+	  draw_outlined = FALSE;
+	else
+	  alpha_draw = MIN((float)alpha_draw * 1.5, SDL_ALPHA_OPAQUE);
+      }
+
+      SDL_SetRenderDrawColor(sdl_renderer, 255, 255, 255, alpha_draw);
+
+      rect.x = (x + 0) * video.screen_width  / grid_xsize;
+      rect.y = (y + 0) * video.screen_height / grid_ysize;
+      rect.w = (x + 1) * video.screen_width  / grid_xsize - rect.x;
+      rect.h = (y + 1) * video.screen_height / grid_ysize - rect.y;
+
+      if (x == 0 || overlay.grid_button[x - 1][y] != grid_button)
+      {
+	rect.x += border_size;
+	rect.w -= border_size;
+
+	outline_border |= MV_LEFT;
+      }
+
+      if (x == grid_xsize - 1 || overlay.grid_button[x + 1][y] != grid_button)
+      {
+	rect.w -= border_size;
+
+	outline_border |= MV_RIGHT;
+      }
+
+      if (y == 0 || overlay.grid_button[x][y - 1] != grid_button)
+      {
+	rect.y += border_size;
+	rect.h -= border_size;
+
+	outline_border |= MV_UP;
+      }
+
+      if (y == grid_ysize - 1 || overlay.grid_button[x][y + 1] != grid_button)
+      {
+	rect.h -= border_size;
+
+	outline_border |= MV_DOWN;
+      }
+
+      if (draw_outlined)
+      {
+	int rect_x = rect.x +
+	  (outline_border & MV_LEFT  ? border_size : 0);
+	int rect_w = rect.w -
+	  (outline_border & MV_LEFT  ? border_size : 0) -
+	  (outline_border & MV_RIGHT ? border_size : 0);
+
+	if (outline_border & MV_LEFT)
+	  RenderFillRectangle(rect.x, rect.y, border_size, rect.h);
+
+	if (outline_border & MV_RIGHT)
+	  RenderFillRectangle(rect.x + rect.w - border_size, rect.y,
+			      border_size, rect.h);
+
+	if (outline_border & MV_UP)
+	  RenderFillRectangle(rect_x, rect.y, rect_w, border_size);
+
+	if (outline_border & MV_DOWN)
+	  RenderFillRectangle(rect_x, rect.y + rect.h - border_size,
+			      rect_w, border_size);
+      }
+      else
+      {
+	SDL_RenderFillRect(sdl_renderer, &rect);
+      }
+    }
+  }
+
+  SDL_SetRenderDrawColor(sdl_renderer, 0, 0, 0, 255);
+}
+
+static void DrawTouchInputOverlay(void)
+{
+  static SDL_Texture *texture = NULL;
+  static boolean initialized = FALSE;
+  static boolean deactivated = TRUE;
+  static boolean show_grid = FALSE;
+  static int width = 0, height = 0;
+  static int alpha_last = -1;
+  static int alpha = 0;
+  int alpha_max = ALPHA_FROM_TRANSPARENCY(setup.touch.transparency);
+  int alpha_step = ALPHA_FADING_STEPSIZE(alpha_max);
+  boolean active = (overlay.enabled && overlay.active);
+
+  if (!active && deactivated)
+    return;
+
+  if (active)
+  {
+    if (alpha < alpha_max)
+      alpha = MIN(alpha + alpha_step, alpha_max);
+
+    deactivated = FALSE;
+  }
+  else
+  {
+    alpha = MAX(0, alpha - alpha_step);
+
+    if (alpha == 0)
+      deactivated = TRUE;
+  }
+
+  if (overlay.show_grid)
+    show_grid = TRUE;
+  else if (deactivated)
+    show_grid = FALSE;
+
+  if (show_grid)
+    DrawTouchInputOverlay_ShowGrid(alpha);
+
+  DrawTouchInputOverlay_ShowGridButtons(alpha);
+
+  return;
+
+
+  // !!! VIRTUAL BUTTONS FROM IMAGE FILE NOT USED ANYMORE !!!
+
+  if (!initialized)
+  {
+    char *basename = "overlay/VirtualButtons.png";
+    char *filename = getCustomImageFilename(basename);
+
+    if (filename == NULL)
+      Error(ERR_EXIT, "LoadCustomImage(): cannot find file '%s'", basename);
+
+    SDL_Surface *surface;
+
+    if ((surface = IMG_Load(filename)) == NULL)
+      Error(ERR_EXIT, "IMG_Load() failed: %s", SDL_GetError());
+
+    width  = surface->w;
+    height = surface->h;
+
+    /* set black pixel to transparent if no alpha channel / transparent color */
+    if (!SDLHasAlpha(surface) &&
+	!SDLHasColorKey(surface))
+      SDL_SetColorKey(surface, SET_TRANSPARENT_PIXEL,
+		      SDL_MapRGB(surface->format, 0x00, 0x00, 0x00));
+
+    if ((texture = SDLCreateTextureFromSurface(surface)) == NULL)
+      Error(ERR_EXIT, "SDLCreateTextureFromSurface() failed");
+
+    SDL_FreeSurface(surface);
+
+    SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
+
+    initialized = TRUE;
+  }
+
+  if (alpha != alpha_last)
+    SDL_SetTextureAlphaMod(texture, alpha);
+
+  alpha_last = alpha;
+
+  float ratio_overlay = (float) width / height;
+  float ratio_screen = (float) video.screen_width / video.screen_height;
+  int width_scaled, height_scaled;
+  int xpos, ypos;
+
+  if (ratio_overlay > ratio_screen)
+  {
+    width_scaled = video.screen_width;
+    height_scaled = video.screen_height * ratio_screen / ratio_overlay;
+    xpos = 0;
+    ypos = video.screen_height - height_scaled;
+  }
+  else
+  {
+    width_scaled = video.screen_width * ratio_overlay / ratio_screen;
+    height_scaled = video.screen_height;
+    xpos = (video.screen_width - width_scaled) / 2;
+    ypos = 0;
+  }
+
+  SDL_Rect src_rect = { 0, 0, width, height };
+  SDL_Rect dst_rect = { xpos, ypos, width_scaled, height_scaled };
+
+  SDL_RenderCopy(sdl_renderer, texture, &src_rect, &dst_rect);
+}
+#endif