From 192839a436fbf559812a2ee578eac1310527d5b0 Mon Sep 17 00:00:00 2001
From: Braden Obrzut <admin@maniacsvault.net>
Date: Sun, 29 Apr 2012 00:53:27 +0000
Subject: [PATCH] - Added button mapping for the first 8 axes for SDL
 joysticks.  The first two axes are assumed to be x/y. - Added POV hat support
 for SDL.  (First 4 map to buttons, but all map to an x/y axis.)

SVN r3607 (trunk)
---
 src/sdl/i_joystick.cpp | 97 ++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 93 insertions(+), 4 deletions(-)

diff --git a/src/sdl/i_joystick.cpp b/src/sdl/i_joystick.cpp
index 44cbc08439..e39482c474 100644
--- a/src/sdl/i_joystick.cpp
+++ b/src/sdl/i_joystick.cpp
@@ -1,5 +1,6 @@
 #include <SDL_joystick.h>
 
+#include "doomdef.h"
 #include "m_joy.h"
 
 class SDLInputJoystick: public IJoystickConfig
@@ -9,7 +10,12 @@ public:
 	{
 		Device = SDL_JoystickOpen(DeviceIndex);
 		if(Device != NULL)
+		{
+			NumAxes = SDL_JoystickNumAxes(Device);
+			NumHats = SDL_JoystickNumHats(Device);
+
 			SetDefaultConfig();
+		}
 	}
 	~SDLInputJoystick()
 	{
@@ -38,7 +44,7 @@ public:
 
 	int GetNumAxes()
 	{
-		return SDL_JoystickNumAxes(Device);
+		return NumAxes + NumHats*2;
 	}
 	float GetAxisDeadZone(int axis)
 	{
@@ -95,10 +101,14 @@ public:
 		for(int i = 0;i < GetNumAxes();i++)
 		{
 			AxisInfo info;
-			info.Name.Format("Axis %d", i);
+			if(i < NumAxes)
+				info.Name.Format("Axis %d", i+1);
+			else
+				info.Name.Format("Hat %d (%c)", (i-NumAxes)/2 + 1, (i-NumAxes)%2 == 0 ? 'x' : 'y');
 			info.DeadZone = 0.0f;
 			info.Multiplier = 1.0f;
 			info.Value = 0.0;
+			info.ButtonValue = 0;
 			if(i >= 5)
 				info.GameAxis = JOYAXIS_None;
 			else
@@ -125,10 +135,86 @@ public:
 
 	void ProcessInput()
 	{
-		for (int i = 0; i < GetNumAxes(); ++i)
+		BYTE buttonstate;
+
+		for (int i = 0; i < NumAxes; ++i)
 		{
+			buttonstate = 0;
+
 			Axes[i].Value = SDL_JoystickGetAxis(Device, i)/32768.0;
-			Axes[i].Value = Joy_RemoveDeadZone(Axes[i].Value, Axes[i].DeadZone, NULL);
+			Axes[i].Value = Joy_RemoveDeadZone(Axes[i].Value, Axes[i].DeadZone, &buttonstate);
+
+			// Map button to axis
+			// X and Y are handled differently so if we have 2 or more axes then we'll use that code instead.
+			if (NumAxes == 1 || (i >= 2 && i < NUM_JOYAXISBUTTONS))
+			{
+				Joy_GenerateButtonEvents(Axes[i].ButtonValue, buttonstate, 2, KEY_JOYAXIS1PLUS + i*2);
+				Axes[i].ButtonValue = buttonstate;
+			}
+		}
+
+		if(NumAxes > 1)
+		{
+			buttonstate = Joy_XYAxesToButtons(Axes[0].Value, Axes[1].Value);
+			Joy_GenerateButtonEvents(Axes[0].ButtonValue, buttonstate, 4, KEY_JOYAXIS1PLUS);
+			Axes[0].ButtonValue = buttonstate;
+		}
+
+		// Map POV hats to buttons and axes.  Why axes?  Well apparently I have
+		// a gamepad where the left control stick is a POV hat (instead of the
+		// d-pad like you would expect, no that's pressure sensitive).  Also
+		// KDE's joystick dialog maps them to axes as well.
+		for (int i = 0; i < NumHats; ++i)
+		{
+			AxisInfo &x = Axes[NumAxes + i*2];
+			AxisInfo &y = Axes[NumAxes + i*2 + 1];
+
+			buttonstate = SDL_JoystickGetHat(Device, i);
+			switch(buttonstate)
+			{
+				case SDL_HAT_LEFTUP:
+					x.Value = -1.0;
+					y.Value = -1.0;
+					break;
+				case SDL_HAT_LEFT:
+					x.Value = -1.0;
+					y.Value = 0.0;
+					break;
+				case SDL_HAT_LEFTDOWN:
+					x.Value = -1.0;
+					y.Value = 1.0;
+					break;
+				case SDL_HAT_RIGHTUP:
+					x.Value = 1.0;
+					y.Value = -1.0;
+					break;
+				case SDL_HAT_RIGHT:
+					x.Value = 1.0;
+					y.Value = 0.0;
+					break;
+				case SDL_HAT_RIGHTDOWN:
+					x.Value = 1.0;
+					y.Value = 1.0;
+					break;
+				case SDL_HAT_UP:
+					x.Value = 0.0;
+					y.Value = -1.0;
+					break;
+				case SDL_HAT_DOWN:
+					x.Value = 0.0;
+					y.Value = 1.0;
+					break;
+				default:
+					x.Value = 0.0;
+					y.Value = 0.0;
+					break;
+			}
+
+			if(i < 4)
+			{
+				Joy_GenerateButtonEvents(x.ButtonValue, buttonstate, 4, KEY_JOYPOV1_UP + i*4);
+				x.ButtonValue = buttonstate;
+			}
 		}
 	}
 
@@ -140,6 +226,7 @@ protected:
 		float Multiplier;
 		EJoyAxis GameAxis;
 		double Value;
+		BYTE ButtonValue;
 	};
 	static const EJoyAxis DefaultAxes[5];
 
@@ -148,6 +235,8 @@ protected:
 
 	float				Multiplier;
 	TArray<AxisInfo>	Axes;
+	int					NumAxes;
+	int					NumHats;
 };
 const EJoyAxis SDLInputJoystick::DefaultAxes[5] = {JOYAXIS_Side, JOYAXIS_Forward, JOYAXIS_Pitch, JOYAXIS_Yaw, JOYAXIS_Up};