Merged SDL2 changes from bartbes/love-experiments/SDL2 into default.

- Added love.system module, including clipboard functions.

- Added custom hardware cursors (love.mouse.newCursor, love.mouse.setCursor.)

- Revamped love.joystick:
-- added Joystick objects and moved love.joystick functions which operated on individual joysticks to methods on the Joystick objects.
-- Added love.joystick.getJoystick and love.joystick.getJoystickCount.
-- Added events for when joysticks are connected and disconnected.
-- Added 'Gamepad' methods to Joystick objects: Joystick:isGamepad, Joystick:getGamepadAxis, and Joystick:isGamepadDown. They're a common abstraction for xbox controller-like joystick across operating systems.

- Added monitor choosing support and "fullscreen desktop" mode to love.window.

- Moved unicode text input events to their own callback function (love.textinput), removed the key repeat functions from love.keyboard and made the second argument of love.keypressed a boolean saying whether the keypress was a repeat.

- liblove now works with love.window and love.graphics in OS X

src/modules/joystick/Joystick.cpp

@@ -18,15 +18,26 @@
  * 3. This notice may not be removed or altered from any source distribution.
  **/
 
+// LOVE
 #include "Joystick.h"
 
+// STL
+#include <cmath>
+
 namespace love
 {
 namespace joystick
 {
 
-Joystick::~Joystick()
+float Joystick::clampval(float x) const
 {
+	if (fabsf(x) < 0.01)
+		return 0.0f;
+
+	if (x < -0.99f) return -1.0f;
+	if (x > 0.99f) return 1.0f;
+
+	return x;
 }
 
 bool Joystick::getConstant(const char *in, Joystick::Hat &out)
@@ -34,11 +45,41 @@ bool Joystick::getConstant(const char *in, Joystick::Hat &out)
 	return hats.find(in, out);
 }
 
-bool Joystick::getConstant(Joystick::Hat in, const char  *&out)
+bool Joystick::getConstant(Joystick::Hat in, const char *&out)
 {
 	return hats.find(in, out);
 }
 
+bool Joystick::getConstant(const char *in, Joystick::GamepadAxis &out)
+{
+	return gpAxes.find(in, out);
+}
+
+bool Joystick::getConstant(Joystick::GamepadAxis in, const char *&out)
+{
+	return gpAxes.find(in, out);
+}
+
+bool Joystick::getConstant(const char *in, Joystick::GamepadButton &out)
+{
+	return gpButtons.find(in, out);
+}
+
+bool Joystick::getConstant(Joystick::GamepadButton in, const char *&out)
+{
+	return gpButtons.find(in, out);
+}
+
+bool Joystick::getConstant(const char *in, Joystick::InputType &out)
+{
+	return inputTypes.find(in, out);
+}
+
+bool Joystick::getConstant(Joystick::InputType in, const char *&out)
+{
+	return inputTypes.find(in, out);
+}
+
 StringMap<Joystick::Hat, Joystick::HAT_MAX_ENUM>::Entry Joystick::hatEntries[] =
 {
 	{"c", Joystick::HAT_CENTERED},
@@ -54,5 +95,47 @@ StringMap<Joystick::Hat, Joystick::HAT_MAX_ENUM>::Entry Joystick::hatEntries[] =
 
 StringMap<Joystick::Hat, Joystick::HAT_MAX_ENUM> Joystick::hats(Joystick::hatEntries, sizeof(Joystick::hatEntries));
 
+StringMap<Joystick::GamepadAxis, Joystick::GAMEPAD_AXIS_MAX_ENUM>::Entry Joystick::gpAxisEntries[] =
+{
+	{"leftx", GAMEPAD_AXIS_LEFTX},
+	{"lefty", GAMEPAD_AXIS_LEFTY},
+	{"rightx", GAMEPAD_AXIS_RIGHTX},
+	{"righty", GAMEPAD_AXIS_RIGHTY},
+	{"triggerleft", GAMEPAD_AXIS_TRIGGERLEFT},
+	{"triggerright", GAMEPAD_AXIS_TRIGGERRIGHT},
+};
+
+StringMap<Joystick::GamepadAxis, Joystick::GAMEPAD_AXIS_MAX_ENUM> Joystick::gpAxes(Joystick::gpAxisEntries, sizeof(Joystick::gpAxisEntries));
+
+StringMap<Joystick::GamepadButton, Joystick::GAMEPAD_BUTTON_MAX_ENUM>::Entry Joystick::gpButtonEntries[] =
+{
+	{"a", GAMEPAD_BUTTON_A},
+	{"b", GAMEPAD_BUTTON_B},
+	{"x", GAMEPAD_BUTTON_X},
+	{"y", GAMEPAD_BUTTON_Y},
+	{"back", GAMEPAD_BUTTON_BACK},
+	{"guide", GAMEPAD_BUTTON_GUIDE},
+	{"start", GAMEPAD_BUTTON_START},
+	{"leftstick", GAMEPAD_BUTTON_LEFTSTICK},
+	{"rightstick", GAMEPAD_BUTTON_RIGHTSTICK},
+	{"leftshoulder", GAMEPAD_BUTTON_LEFTSHOULDER},
+	{"rightshoulder", GAMEPAD_BUTTON_RIGHTSHOULDER},
+	{"dpup", GAMEPAD_BUTTON_DPAD_UP},
+	{"dpdown", GAMEPAD_BUTTON_DPAD_DOWN},
+	{"dpleft", GAMEPAD_BUTTON_DPAD_LEFT},
+	{"dpright", GAMEPAD_BUTTON_DPAD_RIGHT},
+};
+
+StringMap<Joystick::GamepadButton, Joystick::GAMEPAD_BUTTON_MAX_ENUM> Joystick::gpButtons(Joystick::gpButtonEntries, sizeof(Joystick::gpButtonEntries));
+
+StringMap<Joystick::InputType, Joystick::INPUT_TYPE_MAX_ENUM>::Entry Joystick::inputTypeEntries[] =
+{
+	{"axis", Joystick::INPUT_TYPE_AXIS},
+	{"button", Joystick::INPUT_TYPE_BUTTON},
+	{"hat", Joystick::INPUT_TYPE_HAT},
+};
+
+StringMap<Joystick::InputType, Joystick::INPUT_TYPE_MAX_ENUM> Joystick::inputTypes(Joystick::inputTypeEntries, sizeof(Joystick::inputTypeEntries));
+
 } // joystick
 } // love