libretro: Add GET_CORE_DATA and SET_CORE_DATA environment callbacks

dynamic.h

@@ -68,6 +68,13 @@ struct retro_core_t
 
    unsigned poll_type;
    uint8_t flags;
+
+   /**
+    * Arbitrary core data.
+    *
+    * @see RETRO_ENVIRONMENT_GET_CORE_DATA
+    */
+   void *core_data;
 };
 
 

libretro-common/include/libretro.h

@@ -2574,6 +2574,32 @@ enum retro_mod
  */
 #define RETRO_ENVIRONMENT_GET_FILE_BROWSER_START_DIRECTORY 80
 
+/**
+ * Sets a pointer to arbitrary data for the actively running core.
+ *
+ * Intended for use as a substitute for global state, which is a common
+ * source of bugs. Can be set in either \c retro_init() or \c retro_load_game().
+ *
+ * @param[in] data <tt>void *</tt>. Pointer to the data to set.
+ * @return \c true if the environment call is available.
+ *
+ * @see RETRO_ENVIRONMENT_GET_CORE_DATA
+ */
+#define RETRO_ENVIRONMENT_SET_CORE_DATA (81 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+
+/**
+ * Gets a pointer to arbitrary data for the actively running core.
+ *
+ * This is persistent for the lifetime of the core until \c retro_deinit() is called.
+ *
+ * @param[out] data <tt>void **</tt>. Pointer to the data that was set.
+ * May be \c NULL if the data was not set yet.
+ * @return \c true if the environment call is available.
+ *
+ * @see RETRO_ENVIRONMENT_SET_CORE_DATA
+ */
+#define RETRO_ENVIRONMENT_GET_CORE_DATA (82 | RETRO_ENVIRONMENT_EXPERIMENTAL)
+
 /**@}*/
 
 /**

runloop.c

@@ -3556,6 +3556,18 @@ bool runloop_environment_cb(unsigned cmd, void *data)
             }
          }
          break;
+
+      case RETRO_ENVIRONMENT_SET_CORE_DATA:
+         runloop_st->current_core.core_data = data;
+         break;
+
+      case RETRO_ENVIRONMENT_GET_CORE_DATA:
+         if (data != NULL) {
+            void **core_data = (void **)data;
+            *core_data = runloop_st->current_core.core_data;
+         }
+         break;
+
       default:
          RARCH_LOG("[Environ]: UNSUPPORTED (#%u).\n", cmd);
          return false;