added configurability of transparency for virtual buttons

[rocksndiamonds.git] / src / libgame / system.h

diff --git a/src/libgame/system.h b/src/libgame/system.h
index 4ef22022c95a4e2d1dde0325742dce733695c09b..88df586da83d553995800bd2767552197b33418e 100644 (file)
--- a/src/libgame/system.h
+++ b/src/libgame/system.h
@@ -96,7 +96,10 @@
 
 #define TOUCH_MOVE_DISTANCE_DEFAULT    2
 #define TOUCH_DROP_DISTANCE_DEFAULT    5
+#define TOUCH_TRANSPARENCY_DEFAULT     50
 
+#define ALPHA_FROM_TRANSPARENCY(x)     ((100 - x) * SDL_ALPHA_OPAQUE / 100)
+#define ALPHA_FADING_STEPSIZE(x)       ((x) / 25)
 
 /* values for special settings for mobile devices */
 #if defined(PLATFORM_ANDROID)
@@ -1056,6 +1059,8 @@ struct SetupTouchInfo
 
   char grid_button[2][MAX_GRID_XSIZE][MAX_GRID_YSIZE];
 
+  int transparency;            /* in percent (0 == opaque, 100 == invisible) */
+
   boolean grid_initialized;
 };