Separated joystick state from window system state.

This is partially in preparation for pending support for additional
joystick APIs like XInput, DirectInput and IOHID.

src/winmm_joystick.h

@@ -0,0 +1,56 @@
+//========================================================================
+// GLFW 3.1 WinMM - www.glfw.org
+//------------------------------------------------------------------------
+// Copyright (c) 2006-2014 Camilla Berglund <elmindreda@elmindreda.org>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would
+//    be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+//    be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+//    distribution.
+//
+//========================================================================
+
+#ifndef _winmm_joystick_h_
+#define _winmm_joystick_h_
+
+#define _GLFW_PLATFORM_LIBRARY_JOYSTICK_STATE \
+    _GLFWjoystickWinMM joystick[GLFW_JOYSTICK_LAST + 1]
+
+
+//========================================================================
+// GLFW platform specific types
+//========================================================================
+
+//------------------------------------------------------------------------
+// Platform-specific joystick structure
+//------------------------------------------------------------------------
+typedef struct _GLFWjoystickWinMM
+{
+    float           axes[6];
+    unsigned char   buttons[36]; // 32 buttons plus one hat
+    char*           name;
+} _GLFWjoystickWinMM;
+
+
+//========================================================================
+// Prototypes for platform specific internal functions
+//========================================================================
+
+void _glfwInitJoysticks(void);
+void _glfwTerminateJoysticks(void);
+
+#endif // _winmm_joystick_h_