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-rw-r--r--Samples/CommonSrc/Platform/Linux_Gamepad.cpp453
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diff --git a/Samples/CommonSrc/Platform/Linux_Gamepad.cpp b/Samples/CommonSrc/Platform/Linux_Gamepad.cpp
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-/************************************************************************************
-
-Filename : Linux_Gamepad.cpp
-Content : Linux implementation of Platform app infrastructure
-Created : May 6, 2013
-Authors : Lee Cooper, Simon Hallam
-
-Copyright : Copyright 2013 Oculus VR, Inc. All Rights reserved.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-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 {
-
-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()
-{
- return 1;
-}
-
-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
-
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