Add API to access battery power state

Done:
- X11, server (tested)
- Windows (developed, would be nice to retest)
- OSX (not tested)
Prepared (not developed):
- Android (code is here, but may not compile)
- iphone
- winrt
- bb10
- haiku
- javascript

3 files changed, 60 insertions, 0 deletions

diff --git a/core/os/os.cpp b/core/os/os.cpp
index 912f7f0b0f..1d670b4466 100644
--- a/core/os/os.cpp
+++ b/core/os/os.cpp
@@ -513,6 +513,16 @@ bool OS::is_vsync_enabled() const{
 }
 
 
+PowerState OS::get_power_state() {
+	return POWERSTATE_UNKNOWN;
+}
+int OS::get_power_seconds_left() {
+	return -1;
+}
+int OS::get_power_percent_left() {
+	return -1;
+}
+
 OS::OS() {
 	last_error=NULL;
 	singleton=this;
diff --git a/core/os/os.h b/core/os/os.h
index e179b82dae..7c8100679a 100644
--- a/core/os/os.h
+++ b/core/os/os.h
@@ -34,8 +34,10 @@
 #include "vector.h"
 #include "engine.h"
 #include "os/main_loop.h"
+#include "power.h"
 #include <stdarg.h>
 
+
 /**
 	@author Juan Linietsky <reduzio@gmail.com>
 */
@@ -402,6 +404,10 @@ public:
 
 	virtual void set_use_vsync(bool p_enable);
 	virtual bool is_vsync_enabled() const;
+	
+	virtual PowerState get_power_state();
+	virtual int get_power_seconds_left();
+	virtual int get_power_percent_left();
 
 	virtual bool check_feature_support(const String& p_feature)=0;
 
diff --git a/core/os/power.h b/core/os/power.h
new file mode 100644
index 0000000000..c858d391a1
--- /dev/null
+++ b/core/os/power.h
@@ -0,0 +1,44 @@
+/*************************************************************************/
+/*  power.h                                                              */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                    http://www.godotengine.org                         */
+/*************************************************************************/
+/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef CORE_OS_POWER_H_
+#define CORE_OS_POWER_H_
+
+
+typedef enum
+{
+	POWERSTATE_UNKNOWN,      /**< cannot determine power status */
+	POWERSTATE_ON_BATTERY,   /**< Not plugged in, running on the battery */
+	POWERSTATE_NO_BATTERY,   /**< Plugged in, no battery available */
+	POWERSTATE_CHARGING,     /**< Plugged in, charging battery */
+	POWERSTATE_CHARGED       /**< Plugged in, battery charged */
+} PowerState;
+
+
+#endif /* CORE_OS_POWER_H_ */