From 38568f7dfac13f7a53f1d8751db2a63b64c935e8 Mon Sep 17 00:00:00 2001
From: Holger Schemel <info@artsoft.org>
Date: Fri, 27 Apr 2018 01:56:05 +0200
Subject: [PATCH] added grid to (not yet functional) setup screen to configure
 virtual buttons

---
 src/libgame/sdl.c    | 40 ++++++++++++++++++++++++++++++++++++++++
 src/libgame/system.c | 12 ++++++++++++
 src/libgame/system.h |  3 +++
 src/screens.c        |  4 ++++
 4 files changed, 59 insertions(+)

diff --git a/src/libgame/sdl.c b/src/libgame/sdl.c
index 07064a4b..3eb2a737 100644
--- a/src/libgame/sdl.c
+++ b/src/libgame/sdl.c
@@ -2984,11 +2984,39 @@ boolean SDLReadJoystick(int nr, int *x, int *y, boolean *b1, boolean *b2)
 /* ========================================================================= */
 
 #if defined(USE_TOUCH_INPUT_OVERLAY)
+static void DrawTouchInputOverlay_ShowGrid(int alpha)
+{
+  SDL_Rect rect;
+  int grid_xsize = 18;
+  int grid_ysize = 11;
+  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;
+
+      SDL_RenderDrawRect(sdl_renderer, &rect);
+    }
+  }
+
+  SDL_SetRenderDrawColor(sdl_renderer, 0, 0, 0, 255);
+}
+
 static void DrawTouchInputOverlay()
 {
   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_max = SDL_ALPHA_OPAQUE / 2;
   static int alpha_step = 5;
@@ -3014,6 +3042,18 @@ static void DrawTouchInputOverlay()
       deactivated = TRUE;
   }
 
+  if (overlay.show_grid)
+    show_grid = TRUE;
+  else if (deactivated)
+    show_grid = FALSE;
+
+  if (show_grid)
+  {
+    DrawTouchInputOverlay_ShowGrid(alpha);
+
+    return;
+  }
+
   if (!initialized)
   {
     char *basename = "overlay/VirtualButtons.png";
diff --git a/src/libgame/system.c b/src/libgame/system.c
index f9f42fc8..29c3b24c 100644
--- a/src/libgame/system.c
+++ b/src/libgame/system.c
@@ -328,6 +328,8 @@ void InitOverlayInfo()
   overlay.enabled = FALSE;
   overlay.active = FALSE;
 
+  overlay.show_grid = FALSE;
+
 #if defined(PLATFORM_ANDROID)
   if (strEqual(setup.touch.control_type, TOUCH_CONTROL_VIRTUAL_BUTTONS))
     overlay.enabled = TRUE;
@@ -385,6 +387,16 @@ void SetOverlayActive(boolean active)
   overlay.active = active;
 }
 
+void SetOverlayShowGrid(boolean show_grid)
+{
+  overlay.show_grid = show_grid;
+
+  SetOverlayActive(show_grid);
+
+  if (show_grid)
+    SetOverlayEnabled(TRUE);
+}
+
 boolean GetOverlayActive()
 {
   return overlay.active;
diff --git a/src/libgame/system.h b/src/libgame/system.h
index c645089b..6bf12a66 100644
--- a/src/libgame/system.h
+++ b/src/libgame/system.h
@@ -976,6 +976,8 @@ struct OverlayInfo
 {
   boolean enabled;		/* overlay generally enabled or disabled */
   boolean active;		/* overlay activated (depending on game mode) */
+
+  boolean show_grid;
 };
 
 struct JoystickInfo
@@ -1544,6 +1546,7 @@ void SetTileCursorXY(int, int);
 void SetTileCursorSXSY(int, int);
 void SetOverlayEnabled(boolean);
 void SetOverlayActive(boolean);
+void SetOverlayShowGrid(boolean);
 boolean GetOverlayActive();
 void SetDrawDeactivationMask(int);
 int GetDrawDeactivationMask(void);
diff --git a/src/screens.c b/src/screens.c
index 6d23dc80..dbac875b 100644
--- a/src/screens.c
+++ b/src/screens.c
@@ -7205,6 +7205,8 @@ boolean ConfigureVirtualButtonsMain()
 
   FadeIn(REDRAW_FIELD);
 
+  SetOverlayShowGrid(TRUE);
+
   while (!finished)
   {
     Event event;
@@ -7285,6 +7287,8 @@ boolean ConfigureVirtualButtonsMain()
     BackToFront();
   }
 
+  SetOverlayShowGrid(FALSE);
+
   return success;
 }
 
-- 
2.34.1