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Add gamepad config for PS4 DualShock 4.

Thanks to Matt Davis (3nT) for providing a detailed report for this
gamepad.

--- a/src/setup/joystick.c

+++ b/src/setup/joystick.c

@@ -156,6 +156,22 @@

     {NULL, 0},

 };

+// Playstation 4 Dual Shock 4 (DS4)

+static const joystick_config_t ps4_ds4_controller[] =

+{

+    {"joystick_x_axis",        CREATE_HAT_AXIS(0, HAT_AXIS_HORIZONTAL)},

+    {"joystick_y_axis",        CREATE_HAT_AXIS(0, HAT_AXIS_VERTICAL)},

+    {"joyb_fire",              0},  // Square

+    {"joyb_speed",             1},  // X

+    {"joyb_use",               2},  // Circle

+    {"joyb_jump",              3},  // Triangle

+    {"joyb_strafeleft",        6},  // Bottom shoulder buttons

+    {"joyb_straferight",       7},

+    {"joyb_prevweapon",        4},  // Top shoulder buttons

+    {"joyb_nextweapon",        5},

+    {"joyb_menu_activate",     12}, // Playstation logo button

+};

+

 static const joystick_config_t airflo_controller[] =

 {

     {"joystick_x_axis",        CREATE_HAT_AXIS(0, HAT_AXIS_HORIZONTAL)},

@@ -331,6 +347,15 @@

         "USB,2-axis 8-button gamepad  ",

         2, 8, 0,

         buffalo_classic_controller,

+    },

+

+    // PS4 controller just appears as the generic-sounding "Wireless

+    // Controller". Hopefully the number of buttons/axes/hats should be

+    // enough to distinguish it from other gamepads.

+    {

+        "Wireless Controller",

+        6, 14, 1,

+        ps4_ds4_controller,

     },

 };