Switch between controller glyphs and keyboard keys automatically

If a controller button is pressed, a controller is connected (even at
startup!) or an axis is moved, the game will switch to displaying
controller glyphs. If a keyboard key is pressed or the last controller
is removed, the game will switch to displaying keyboard keys.

desktop_version/src/ButtonGlyphs.cpp

@@ -136,6 +136,9 @@ static const char* glyph_layout[LAYOUT_TOTAL][SDL_CONTROLLER_BUTTON_RIGHTSHOULDE
     }
 };
 
+static bool keyboard_is_active = true;
+static ButtonGlyphLayout layout = LAYOUT_GENERIC;
+
 void BUTTONGLYPHS_init(void)
 {
     /* Set glyph array to strings for all the button glyph codepoints (U+EBxx) */
@@ -156,7 +159,12 @@ bool BUTTONGLYPHS_keyboard_is_active(void)
 {
     /* Returns true if, not only do we have a keyboard available, but it's also the
      * active input method. (So, show keyboard keys, if false, show controller glyphs) */
-    return true;
+    return keyboard_is_active;
+}
+
+void BUTTONGLYPHS_keyboard_set_active(bool active)
+{
+    keyboard_is_active = active;
 }
 
 const char* BUTTONGLYPHS_get_wasd_text(void)
@@ -177,7 +185,7 @@ static const char* sdlbutton_to_glyph(const SDL_GameControllerButton button)
         return glyph[GLYPH_UNKNOWN];
     }
 
-    return glyph_layout[LAYOUT_PLAYSTATION][button];
+    return glyph_layout[layout][button];
 }
 
 static const char* glyph_for_vector(

desktop_version/src/ButtonGlyphs.h

@@ -15,6 +15,8 @@ void BUTTONGLYPHS_init(void);
 
 bool BUTTONGLYPHS_keyboard_is_available(void);
 bool BUTTONGLYPHS_keyboard_is_active(void);
+void BUTTONGLYPHS_keyboard_set_active(bool active);
+
 const char* BUTTONGLYPHS_get_wasd_text(void);
 const char* BUTTONGLYPHS_get_button(ActionSet actionset, Action action, int binding);
 

desktop_version/src/KeyPoll.cpp

@@ -4,6 +4,7 @@
 #include <string.h>
 
 #include "Alloc.h"
+#include "ButtonGlyphs.h"
 #include "Exit.h"
 #include "Game.h"
 #include "GlitchrunnerMode.h"
@@ -174,6 +175,8 @@ void KeyPoll::Poll(void)
                 music.playef(4);
             }
 
+            BUTTONGLYPHS_keyboard_set_active(true);
+
             if (textentry())
             {
                 if (evt.key.keysym.sym == SDLK_BACKSPACE && !keybuffer.empty())
@@ -268,6 +271,7 @@ void KeyPoll::Poll(void)
         /* Controller Input */
         case SDL_CONTROLLERBUTTONDOWN:
             buttonmap[(SDL_GameControllerButton) evt.cbutton.button] = true;
+            BUTTONGLYPHS_keyboard_set_active(false);
             break;
         case SDL_CONTROLLERBUTTONUP:
             buttonmap[(SDL_GameControllerButton) evt.cbutton.button] = false;
@@ -300,6 +304,7 @@ void KeyPoll::Poll(void)
                 }
                 break;
             }
+            BUTTONGLYPHS_keyboard_set_active(false);
             break;
         }
         case SDL_CONTROLLERDEVICEADDED:
@@ -311,6 +316,7 @@ void KeyPoll::Poll(void)
                 SDL_GameControllerName(toOpen)
             );
             controllers[SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(toOpen))] = toOpen;
+            BUTTONGLYPHS_keyboard_set_active(false);
             break;
         }
         case SDL_CONTROLLERDEVICEREMOVED:
@@ -319,6 +325,10 @@ void KeyPoll::Poll(void)
             controllers.erase(evt.cdevice.which);
             vlog_info("Closing %s", SDL_GameControllerName(toClose));
             SDL_GameControllerClose(toClose);
+            if (controllers.empty())
+            {
+                BUTTONGLYPHS_keyboard_set_active(true);
+            }
             break;
         }