Add gamepad support, initial commit.

Author: mupfdev

src/core.c

@@ -538,6 +538,7 @@ bool handle_events(SDL_Renderer* renderer, SDL_Event* event)
         {
             return false;
         }
+        case SDL_EVENT_GAMEPAD_BUTTON_DOWN:
         case SDL_EVENT_KEY_DOWN:
         {
             if (state == STATE_MENU)
@@ -570,6 +571,20 @@ bool handle_events(SDL_Renderer* renderer, SDL_Event* event)
                     case SDLK_HASH: // Show FPS on the N-Gage.
                         render_cartridge(renderer);
                 }
+                switch (event->button.button)
+                {
+                    case SDL_BUTTON_LEFT:
+                        select_prev_cartridge(renderer);
+                        render_cartridge(renderer);
+                        return true;
+                    case SDL_BUTTON_RIGHT:
+                        select_next_cartridge(renderer);
+                        render_cartridge(renderer);
+                        return true;
+                    case SDL_BUTTON_X1:
+                        run_cartridge(renderer);
+                        return true;
+                }
             }
             else if (state == STATE_EMULATOR)
             {
@@ -586,6 +601,15 @@ bool handle_events(SDL_Renderer* renderer, SDL_Event* event)
                         state = STATE_MENU;
                         return true;
                 }
+                switch (event->button.button)
+                {
+                    case SDL_BUTTON_X2:
+                        destroy_vm();
+                        init_vm(renderer);
+                        reset_memory();
+                        state = STATE_MENU;
+                        return true;
+                }
             }
             break;
         }