[client] added new input:mouseRedraw option

This new option, when enabled (the default) enables cursor movements to
trigger frame updates in the client, improving responsiveness at the
cost of increased FPS while the mouse is moving around.

VERSION

@@ -1 +1 @@
-B2-rc4-7-g5c912e3c27+1
+B2-rc4-8-gf9b6dcc986+1

client/src/config.c

@@ -247,6 +247,13 @@ static struct Option options[] =
     .type           = OPTION_TYPE_INT,
     .value.x_int    = 0,
   },
+  {
+    .module         = "input",
+    .name           = "mouseRedraw",
+    .description    = "Mouse movements trigger redraws (ignores FPS minimum)",
+    .type           = OPTION_TYPE_BOOL,
+    .value.x_bool   = true,
+  },
 
   // spice options
   {
@@ -399,6 +406,7 @@ bool config_load(int argc, char * argv[])
   params.escapeKey     = option_get_int   ("input", "escapeKey"   );
   params.hideMouse     = option_get_bool  ("input", "hideCursor"  );
   params.mouseSens     = option_get_int   ("input", "mouseSens"   );
+  params.mouseRedraw   = option_get_bool  ("input", "mouseRedraw" );
 
   params.minimizeOnFocusLoss = option_get_bool("win", "minimizeOnFocusLoss");
 

client/src/main.c

@@ -358,6 +358,9 @@ static int cursorThread(void * unused)
       state.cursor.x,
       state.cursor.y
     );
+
+    if (params.mouseRedraw)
+      lgSignalEvent(e_frame);
   }
 
   lgmpClientUnsubscribe(&queue);
@@ -1349,13 +1352,15 @@ static int lg_run()
   // ensure renderer viewport is aware of the current window size
   updatePositionInfo();
 
-  // use a default of 60FPS now that frame updates are host update triggered
   if (params.fpsMin == -1)
-    state.frameTime = 1e9 / 60;
+  {
+      // minimum 60fps to keep interactivity decent
+      state.frameTime = 1000000000ULL / 60ULL;
+  }
   else
   {
       DEBUG_INFO("Using the FPS minimum from args: %d", params.fpsMin);
-      state.frameTime = 1e9 / params.fpsMin;
+      state.frameTime = 1000000000ULL / (unsigned long long)params.fpsMin;
   }
 
   register_key_binds();

client/src/main.h

@@ -160,6 +160,7 @@ struct AppParams
 
   const char * windowTitle;
   int          mouseSens;
+  bool         mouseRedraw;
 };
 
 struct CBRequest