Win32_Gamepad.cpp
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00001 /************************************************************************************
00002 
00003 Filename    :   Win32_Gamepad.cpp
00004 Content     :   Win32 implementation of Platform app infrastructure
00005 Created     :   May 6, 2013
00006 Authors     :   Lee Cooper
00007 
00008 Copyright   :   Copyright 2013 Oculus VR, Inc. All Rights reserved.
00009 
00010 Licensed under the Apache License, Version 2.0 (the "License");
00011 you may not use this file except in compliance with the License.
00012 You may obtain a copy of the License at
00013 
00014 http://www.apache.org/licenses/LICENSE-2.0
00015 
00016 Unless required by applicable law or agreed to in writing, software
00017 distributed under the License is distributed on an "AS IS" BASIS,
00018 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00019 See the License for the specific language governing permissions and
00020 limitations under the License.
00021 
00022 ************************************************************************************/
00023 
00024 #include "Win32_Gamepad.h"
00025 
00026 namespace OVR { namespace Platform { namespace Win32 {
00027 
00028 GamepadManager::GamepadManager()
00029 {
00030     hXInputModule = ::LoadLibraryA("Xinput9_1_0.dll");
00031     if (hXInputModule)
00032     {
00033         pXInputGetState = (PFn_XInputGetState)
00034             ::GetProcAddress(hXInputModule, "XInputGetState");        
00035     }
00036 }
00037 
00038 GamepadManager::~GamepadManager()
00039 {
00040     if (hXInputModule)
00041         ::FreeLibrary(hXInputModule);
00042 }
00043 
00044 static inline float GamepadStick(short in)
00045 {
00046     float v;
00047     if (abs(in) < 9000)
00048         return 0;
00049     else if (in > 9000)
00050         v = (float) in - 9000;
00051     else
00052         v = (float) in + 9000;
00053     return v / (32767 - 9000);
00054 }
00055 
00056 static inline float GamepadTrigger(BYTE in)
00057 {
00058     if (in < 30)
00059         return 0;
00060     else
00061         return float(in-30) / 225;
00062 }
00063 
00064 UInt32 GamepadManager::GetGamepadCount()
00065 {
00066     return 1;
00067 }
00068 
00069 bool GamepadManager::GetGamepadState(UInt32 index, GamepadState* pState)
00070 {
00071     // For now we just support one gamepad.
00072     OVR_UNUSED(index);
00073 
00074     if (pXInputGetState)
00075     {
00076         XINPUT_STATE xis;
00077                 
00078         if (pXInputGetState(0, &xis))
00079             return false;
00080 
00081         if (xis.dwPacketNumber == LastPadPacketNo)
00082             return false;
00083 
00084         // State changed.
00085         pState->Buttons = xis.Gamepad.wButtons; // Currently matches Xinput
00086         pState->LT = GamepadTrigger(xis.Gamepad.bLeftTrigger);
00087         pState->RT = GamepadTrigger(xis.Gamepad.bRightTrigger);
00088         pState->LX = GamepadStick(xis.Gamepad.sThumbLX);
00089         pState->LY = GamepadStick(xis.Gamepad.sThumbLY);
00090         pState->RX = GamepadStick(xis.Gamepad.sThumbRX);
00091         pState->RY = GamepadStick(xis.Gamepad.sThumbRY);
00092 
00093         LastPadPacketNo = xis.dwPacketNumber;
00094 
00095         return true;
00096     }
00097 
00098     return false;
00099 }
00100 
00101 }}} // OVR::Platform::Win32


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autogenerated on Fri Aug 28 2015 11:53:11