Merge branch 'master' into stable

2 files changed, 450 insertions, 13 deletions

diff --git a/Samples/CommonSrc/Platform/Linux_Gamepad.cpp b/Samples/CommonSrc/Platform/Linux_Gamepad.cpp
index 9370120..7bca5c5 100644
--- a/Samples/CommonSrc/Platform/Linux_Gamepad.cpp
+++ b/Samples/CommonSrc/Platform/Linux_Gamepad.cpp
@@ -3,7 +3,7 @@
 Filename    :   Linux_Gamepad.cpp
 Content     :   Linux implementation of Platform app infrastructure
 Created     :   May 6, 2013
-Authors     :   Lee Cooper
+Authors     :   Lee Cooper, Simon Hallam
 
 Copyright   :   Copyright 2013 Oculus VR, Inc. All Rights reserved.
 
@@ -21,18 +21,34 @@ limitations under the License.
 
 ************************************************************************************/
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <glob.h>
+#include <linux/joystick.h>
 #include "Linux_Gamepad.h"
 
+
 namespace OVR { namespace Platform { namespace Linux {
 
-GamepadManager::GamepadManager()
-{
+const char* pNameXbox360Wireless = "Xbox 360";
+const char* pNameXbox360Wired    = "Microsoft X-Box 360";
+
 
+GamepadManager::GamepadManager() :
+    pDevice(NULL)
+{
 }
 
 GamepadManager::~GamepadManager()
 {
-
+    // if we have an open device, close it
+    if (pDevice)
+    {
+        pDevice->Close();
+        pDevice = NULL;
+    }
 }
 
 UInt32 GamepadManager::GetGamepadCount()
@@ -40,9 +56,398 @@ UInt32 GamepadManager::GetGamepadCount()
     return 1;
 }
 
-bool GamepadManager::GetGamepadState(UInt32 index, GamepadState* pState)
+bool GamepadManager::GetGamepadState(UInt32 index, GamepadState *pState)
+{
+    if (!pDevice)
+    {
+        // get a list of paths to all the connected joystick devices
+        glob_t joystickGlobBuffer;
+        glob("/dev/input/js*", 0, NULL, &joystickGlobBuffer);
+
+        // open each joystick device, until we find one that will work for our needs
+        for (UInt32 i = 0; i < joystickGlobBuffer.gl_pathc; i++)
+        {
+            pDevice = new Gamepad();
+            if (pDevice->Open(joystickGlobBuffer.gl_pathv[i]))
+            {
+
+                if (pDevice->IsSupportedType())
+                {
+                    break;
+                }
+            }
+
+            // we don't know why the device was not useable, make sure it gets closed cleanly
+            pDevice->Close();
+            pDevice = NULL;
+        }
+
+    }
+
+    if (pDevice)
+    {
+        // we have a device, so update it
+        pDevice->UpdateState();
+
+        // copy the device state into the struct param
+        memcpy(pState, pDevice->GetState(), sizeof(GamepadState));
+
+        // TODO: is the device still active/connected?  if not, we should close it 
+        //       and clear pDevice, so that another device can take over
+
+        return true;
+    }
+    else
+    {
+        return false;
+    }
+}
+
+Gamepad::Gamepad() :
+    IsInitialized(false),
+    Name(String("Undefined")),
+    Type(UNDEFINED)
+{
+}
+
+Gamepad::~Gamepad()
+{
+    this->Close();
+}
+
+bool Gamepad::Open(const String& devicePathName)
 {
+    Name = "Undefined";
+    Type = UNDEFINED;
+
+    FileDescriptor = ::open(devicePathName.ToCStr(), O_RDONLY | O_NONBLOCK);
+    if (FileDescriptor == -1)
+    {
+        return false;
+    }
+
+    // get the device name
+    char name[128];
+    if (ioctl(FileDescriptor, JSIOCGNAME(sizeof(name)), name) < 0)
+    {
+        return false;
+    }
+
+    Name = name;
+
+    // see if device name matches one of our supported devices
+    static const UInt32 Wireless360Len = String(pNameXbox360Wireless).GetLength();
+    static const UInt32 Wired360Len = String(pNameXbox360Wired).GetLength();
+    if (Name.Substring(0, Wireless360Len) == pNameXbox360Wireless)
+    {
+        Type = XBOX360GAMEPADWIRELESS;
+        return true;
+    }
+    else if(Name.Substring(0, Wired360Len) == pNameXbox360Wired)
+    {
+        Type = XBOX360GAMEPADWIRED;
+        return true;
+    }
+
     return false;
 }
 
+bool Gamepad::Close()
+{
+    IsInitialized = false;
+    Name = "Undefined";
+    Type = UNDEFINED;
+    return !::close(FileDescriptor);
+}
+
+void Gamepad::UpdateState()
+{
+    GamepadState *pState = &State;
+    js_event gamepadEvent;
+
+    // read the latest batch of events
+    while (read(FileDescriptor, &gamepadEvent, sizeof(struct js_event)) != -1)
+    {
+        switch (gamepadEvent.type)
+        {
+        case JS_EVENT_BUTTON:
+            IsInitialized = true;
+            SetStateButton(pState, gamepadEvent.number, gamepadEvent.value);
+            break;
+
+        case JS_EVENT_AXIS:
+            IsInitialized = true;
+            SetStateAxis(pState, gamepadEvent.number, gamepadEvent.value);
+            break;
+
+        case JS_EVENT_BUTTON | JS_EVENT_INIT:
+            if (IsInitialized) // skip the fake values during device event initialization
+            {
+                SetStateButton(pState, gamepadEvent.number, gamepadEvent.value);
+            }
+            break;
+
+        case JS_EVENT_AXIS | JS_EVENT_INIT:
+            if (IsInitialized) // skip the fake values during device event initialization
+            {
+                SetStateAxis(pState, gamepadEvent.number, gamepadEvent.value);
+            }
+            break;
+
+        default:
+            LogText("OVR::Linux::UpdateState unknown event type\n");
+        }
+    }
+}
+
+const GamepadState* Gamepad::GetState()
+{
+    return &State;
+}
+
+
+bool Gamepad::IsSupportedType()
+{
+    return Type != UNDEFINED;
+}
+
+const String& Gamepad::GetIdentifier()
+{
+    return Name;
+}
+
+static inline float NormalizeGamepadStickXbox360(SInt32 in)
+{
+    float v;
+    if (abs(in) < 9000) return 0;
+    else if (in > 9000) v = (float)in - 9000;
+    else v = (float)in + 9000;
+    return v / (32767 - 9000);
+}
+
+static inline float NormalizeGamepadTriggerXbox360(SInt32 in, 
+                                                   SInt32 offset, 
+                                                   SInt32 deadBand, 
+                                                   float divisor)
+{
+    in += offset;
+
+    if (in < deadBand) 
+    {
+        return 0;
+    }
+    else
+    {
+        return float(in - deadBand) / divisor;
+    }
+}
+
+static inline void UpdateButtonMaskAndBitfield(GamepadState *pState, 
+                                               SInt32 value, 
+                                               UInt32 buttonBitfield)
+{
+    if (value)
+    {
+        pState->Buttons |= buttonBitfield;
+    }
+    else
+    {
+        pState->Buttons = pState->Buttons & (0xFFFFFFFF ^ buttonBitfield);
+    }
+}
+
+void Gamepad::SetStateAxis(GamepadState *pState, UInt32 axis, SInt32 value)
+{
+    // some pads/sticks have lots in common with one another,
+    // handle those shared cases first
+    switch (Type)
+    {
+    case XBOX360GAMEPADWIRELESS:
+    case XBOX360GAMEPADWIRED:
+        switch (axis)
+        {
+        case 0:
+            pState->LX = NormalizeGamepadStickXbox360(value);
+            break;
+
+        case 1:
+            pState->LY = -NormalizeGamepadStickXbox360(value);
+            break;
+
+        case 3:
+            pState->RX = NormalizeGamepadStickXbox360(value);
+            break;
+
+        case 4:
+            pState->RY = -NormalizeGamepadStickXbox360(value);
+            break;
+        }
+        break;
+
+    case UNDEFINED:
+    default:
+        break;
+    }
+
+    // handle the special cases, or pads/sticks which are unique
+    switch (Type)
+    {
+    case XBOX360GAMEPADWIRELESS:
+        switch (axis)
+        {
+        case 2:
+            pState->LT = NormalizeGamepadTriggerXbox360(value, 0, 500, 32267);
+            break;
+
+        case 5:
+            pState->RT = NormalizeGamepadTriggerXbox360(value, 0, 500, 32267);
+            break;
+        }
+        break;
+
+    case XBOX360GAMEPADWIRED:
+        switch (axis)
+        {
+        case 2:
+            pState->LT = NormalizeGamepadTriggerXbox360(value, 32767, 1000, 64535);
+            break;
+
+        case 5:
+            pState->RT = NormalizeGamepadTriggerXbox360(value, 32767, 1000, 64535);
+            break;
+
+        case 6:
+            if (value == 0)
+            {
+                UpdateButtonMaskAndBitfield(pState, 0, Gamepad_Left);
+                UpdateButtonMaskAndBitfield(pState, 0, Gamepad_Right);
+            }
+            else if (value < 0)
+            {
+                UpdateButtonMaskAndBitfield(pState, 1, Gamepad_Left);
+            }
+            else if (value > 0)
+            {
+                UpdateButtonMaskAndBitfield(pState, 1, Gamepad_Right);
+            }
+            break;
+
+        case 7:
+            if (value == 0)
+            {
+                UpdateButtonMaskAndBitfield(pState, 0, Gamepad_Up);
+                UpdateButtonMaskAndBitfield(pState, 0, Gamepad_Down);
+            }
+            else if (value < 0)
+            {
+                UpdateButtonMaskAndBitfield(pState, 1, Gamepad_Up);
+            }
+            else if (value > 0)
+            {
+                UpdateButtonMaskAndBitfield(pState, 1, Gamepad_Down);
+            }
+            break;
+        }
+        break;
+
+    case UNDEFINED:
+    default:
+        break;
+    }
+}
+
+void Gamepad::SetStateButton(GamepadState *pState, UInt32 button, SInt32 value)
+{
+    // some pads/sticks have lots in common with one another,
+    // handle those shared cases first
+    switch (Type)
+    {
+    case XBOX360GAMEPADWIRELESS:
+    case XBOX360GAMEPADWIRED:
+        switch (button)
+        {
+        case 0:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_A);
+            break;
+
+        case 1:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_B);
+            break;
+
+        case 2:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_X);
+            break;
+
+        case 3:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_Y);
+            break;
+
+        case 4:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_L1);
+            break;
+
+        case 5:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_R1);
+            break;
+
+        case 6:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_Back);
+            break;
+
+        case 7:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_Start);
+            break;
+
+        case 8:
+            // we have no value defined for the Xbox/power button
+            break;
+
+        case 9:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_LStick);
+            break;
+
+        case 10:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_RStick);
+            break;
+        }
+        break;
+
+    case UNDEFINED:
+    default:
+        break;
+    }
+
+    // handle the special cases, or pads/sticks which are unique
+    switch (Type)
+    {
+    case XBOX360GAMEPADWIRELESS:
+        switch (button)
+        {
+        case 11:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_Left);
+            break;
+
+        case 12:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_Right);
+            break;
+
+        case 13:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_Up);
+            break;
+
+        case 14:
+            UpdateButtonMaskAndBitfield(pState, value, Gamepad_Down);
+            break;
+        }
+
+    case XBOX360GAMEPADWIRED:
+        break;
+
+    case UNDEFINED:
+    default:
+        break;
+    }
+}
+
 }}} // OVR::Platform::Linux
+
diff --git a/Samples/CommonSrc/Platform/Linux_Gamepad.h b/Samples/CommonSrc/Platform/Linux_Gamepad.h
index 9e6413d..ba66e70 100644
--- a/Samples/CommonSrc/Platform/Linux_Gamepad.h
+++ b/Samples/CommonSrc/Platform/Linux_Gamepad.h
@@ -3,7 +3,7 @@
 Filename    :   Linux_Gamepad.h
 Content     :   Linux implementation of Gamepad functionality.
 Created     :   May 6, 2013
-Authors     :   Lee Cooper
+Authors     :   Lee Cooper, Simon Hallam
 
 Copyright   :   Copyright 2013 Oculus VR, Inc. All Rights reserved.
 
@@ -28,22 +28,54 @@ limitations under the License.
 
 namespace OVR { namespace Platform { namespace Linux {
 
+class Gamepad;  // forward declaration for readability
+
 class GamepadManager : public Platform::GamepadManager
 {
 public:
+
     GamepadManager();
     ~GamepadManager();
 
-    virtual UInt32  GetGamepadCount();
-    virtual bool    GetGamepadState(UInt32 index, GamepadState* pState);
+    virtual UInt32      GetGamepadCount();
+    virtual bool        GetGamepadState(UInt32 index, GamepadState *pState);
 
 private:
-    // Dynamically ink to XInput to simplify projects.
-    //HMODULE             hXInputModule;
-    //typedef DWORD (WINAPI *PFn_XInputGetState)(DWORD dwUserIndex, XINPUT_STATE* pState);
-    //PFn_XInputGetState  pXInputGetState;
 
-    //UInt32              LastPadPacketNo;
+    Gamepad *pDevice;
+};
+
+class Gamepad
+{
+public:
+
+    Gamepad();
+    virtual ~Gamepad();
+
+    bool                 Open(const String& devicePathName);
+    bool                 Close();
+    bool                 IsSupportedType();
+    const String&        GetIdentifier();
+    void                 UpdateState();
+    const GamepadState*  GetState();
+
+private:
+
+    void                 SetStateAxis(GamepadState *pState, UInt32 axis, SInt32 value);
+    void                 SetStateButton(GamepadState *pState, UInt32 button, SInt32 value);
+
+    enum GamepadType
+    {
+        UNDEFINED,
+        XBOX360GAMEPADWIRELESS,
+        XBOX360GAMEPADWIRED
+    };
+
+    UInt32               FileDescriptor;
+    bool                 IsInitialized; 
+    String               Name;
+    GamepadType          Type;
+    GamepadState         State;
 };
 
 }}}