From e126d0677786bc2a76f4b8dfcbc1be81bd5d9d1b Mon Sep 17 00:00:00 2001
From: Holger Schemel <info@artsoft.org>
Date: Wed, 20 Jan 2016 00:12:01 +0100
Subject: [PATCH] added blitting of textures for global animations

---
 src/libgame/sdl.c    | 43 +++++++++++++++++++++++++++++++++++++++++++
 src/libgame/sdl.h    |  1 +
 src/libgame/system.c | 22 ++++++++++++++++++++++
 src/libgame/system.h |  2 ++
 4 files changed, 68 insertions(+)

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index 71f6cf17..0b2e1c16 100644
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -98,10 +98,22 @@ static void UpdateScreen(SDL_Rect *rect)
   {
     SDL_UpdateTexture(sdl_texture, NULL, screen->pixels, screen->pitch);
   }
+
+  // clear render target buffer
   SDL_RenderClear(sdl_renderer);
+
+  // copy backbuffer to render target buffer
   SDL_RenderCopy(sdl_renderer, sdl_texture, NULL, NULL);
+
+  // copy global animations to render target buffer, if defined
+  if (gfx.draw_global_anim_function != NULL)
+    gfx.draw_global_anim_function();
+
+  // show render target buffer on screen
   SDL_RenderPresent(sdl_renderer);
+
 #else
+
   if (rect)
     SDL_UpdateWindowSurfaceRects(sdl_window, rect, 1);
   else
@@ -961,6 +973,37 @@ void SDLCopyArea(Bitmap *src_bitmap, Bitmap *dst_bitmap,
 #endif
 }
 
+void SDLBlitTexture(Bitmap *bitmap,
+		    int src_x, int src_y, int width, int height,
+		    int dst_x, int dst_y, int mask_mode)
+{
+#if defined(TARGET_SDL2)
+#if USE_RENDERER
+  SDL_Texture *texture;
+  SDL_Rect src_rect;
+  SDL_Rect dst_rect;
+
+  texture =
+    (mask_mode == BLIT_MASKED ? bitmap->texture_masked : bitmap->texture);
+
+  if (texture == NULL)
+    return;
+
+  src_rect.x = src_x;
+  src_rect.y = src_y;
+  src_rect.w = width;
+  src_rect.h = height;
+
+  dst_rect.x = dst_x;
+  dst_rect.y = dst_y;
+  dst_rect.w = width;
+  dst_rect.h = height;
+
+  SDL_RenderCopy(sdl_renderer, texture, &src_rect, &dst_rect);
+#endif
+#endif
+}
+
 void SDLFillRectangle(Bitmap *dst_bitmap, int x, int y, int width, int height,
 		      Uint32 color)
 {
diff --git a/src/libgame/sdl.h b/src/libgame/sdl.h
index c881a3df..ad21926c 100644
--- a/src/libgame/sdl.h
+++ b/src/libgame/sdl.h
@@ -451,6 +451,7 @@ boolean SDLSetVideoMode(DrawBuffer **, boolean);
 void SDLCreateBitmapContent(Bitmap *, int, int, int);
 void SDLFreeBitmapPointers(Bitmap *);
 void SDLCopyArea(Bitmap *, Bitmap *, int, int, int, int, int, int, int);
+void SDLBlitTexture(Bitmap *, int, int, int, int, int, int, int);
 void SDLFillRectangle(Bitmap *, int, int, int, int, Uint32);
 void SDLFadeRectangle(Bitmap *, int, int, int, int, int, int, int,
 		      void (*draw_border_function)(void));
diff --git a/src/libgame/system.c b/src/libgame/system.c
index a4d3f9e8..a1fbad08 100644
--- a/src/libgame/system.c
+++ b/src/libgame/system.c
@@ -720,6 +720,28 @@ void BlitBitmapOnBackground(Bitmap *src_bitmap, Bitmap *dst_bitmap,
 	       dst_x, dst_y);
 }
 
+void BlitTexture(Bitmap *bitmap,
+		int src_x, int src_y, int width, int height,
+		int dst_x, int dst_y)
+{
+  if (bitmap == NULL)
+    return;
+
+  SDLBlitTexture(bitmap, src_x, src_y, width, height, dst_x, dst_y,
+		 BLIT_OPAQUE);
+}
+
+void BlitTextureMasked(Bitmap *bitmap,
+		       int src_x, int src_y, int width, int height,
+		       int dst_x, int dst_y)
+{
+  if (bitmap == NULL)
+    return;
+
+  SDLBlitTexture(bitmap, src_x, src_y, width, height, dst_x, dst_y,
+		 BLIT_MASKED);
+}
+
 void DrawSimpleBlackLine(Bitmap *bitmap, int from_x, int from_y,
 			 int to_x, int to_y)
 {
diff --git a/src/libgame/system.h b/src/libgame/system.h
index f8aa8296..9fd22f15 100644
--- a/src/libgame/system.h
+++ b/src/libgame/system.h
@@ -1337,6 +1337,8 @@ void BlitBitmapMasked(Bitmap *, Bitmap *, int, int, int, int, int, int);
 boolean DrawingOnBackground(int, int);
 boolean DrawingAreaChanged();
 void BlitBitmapOnBackground(Bitmap *, Bitmap *, int, int, int, int, int, int);
+void BlitTexture(Bitmap *, int, int, int, int, int, int);
+void BlitTextureMasked(Bitmap *, int, int, int, int, int, int);
 void DrawSimpleBlackLine(Bitmap *, int, int, int, int);
 void DrawSimpleWhiteLine(Bitmap *, int, int, int, int);
 void DrawLines(Bitmap *, struct XY *, int, Pixel);
-- 
2.34.1