Add RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK. An interface for allowing keyboard event data to be sent to the core.

dynamic.c

@@ -482,6 +482,15 @@ static bool environment_cb(unsigned cmd, void *data)
 
          break;
       }
+      
+      case RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK:
+      {
+         const struct retro_keyboard_callback *info = (const struct retro_keyboard_callback*)data;
+      
+         g_extern.system.key_event = info->callback;
+      
+         break;
+      }
 
       default:
          RARCH_LOG("Environ UNSUPPORTED (#%u).\n", cmd);

general.h

@@ -320,6 +320,8 @@ struct global
       bool force_nonblock;
 
       const char *input_desc_btn[MAX_PLAYERS][RARCH_FIRST_CUSTOM_BIND];
+      
+      retro_keyboard_event_t key_event;
    } system;
 
    struct

gfx/context/sdl_ctx.c

@@ -254,6 +254,24 @@ static void gfx_ctx_check_window(bool *quit,
             *width  = event.resize.w;
             *height = event.resize.h;
             break;
+            
+         case SDL_KEYDOWN:
+         case SDL_KEYUP:
+            if(g_extern.system.key_event)
+            {
+               static bool unicodeOn = false;
+               
+               if(!unicodeOn)
+               {
+                  unicodeOn = true;
+                  SDL_EnableUNICODE(true);
+               }
+               
+               // For now it seems that all RETROK_* constant values match the SDLK_* values.
+               // Ultimately the table in sdl_input.c should be used in case this changes.
+               g_extern.system.key_event(event.type == SDL_KEYDOWN, event.key.keysym.sym, event.key.keysym.unicode);
+            }
+            break;
       }
    }
 

libretro.h

@@ -388,8 +388,22 @@ enum retro_key
                                            // It is up to the frontend to present this in a usable way.
                                            // The array is terminated by retro_input_descriptor::description being set to NULL.
                                            // This function can be called at any time, but it is recommended to call it as early as possible.
+#define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12
+                                           // const struct retro_keyboard_callback * --
+                                           // Sets a callback function used to notify core about keyboard events.
 
 
+// Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK. Called by the frontend in response to keyboard events.
+// down is set if the key is being pressed, or false if it is being released.
+// keycode is the RETROK value of the char.
+// character is the text character of the pressed key. (UTF?)
+typedef void (*retro_keyboard_event_t)(bool down, unsigned keycode, unsigned character);
+
+struct retro_keyboard_callback
+{
+    retro_keyboard_event_t callback;
+};
+
 enum retro_pixel_format
 {
    // 0RGB1555, native endian. 0 bit must be set to 0.