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      1 // Copyright (C) 2011, Google Inc. All rights reserved.
      2 //
      3 // Redistribution and use in source and binary forms, with or without
      4 // modification, are permitted provided that the following conditions are met:
      5 //
      6 // 1. Redistributions of source code must retain the above copyright
      7 //    notice, this list of conditions and the following disclaimer.
      8 // 2. Redistributions in binary form must reproduce the above copyright
      9 //    notice, this list of conditions and the following disclaimer in the
     10 //    documentation and/or other materials provided with the distribution.
     11 //
     12 // THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
     13 // ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     14 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     15 // ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
     16 // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     17 // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     18 // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     19 // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     20 // LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     21 // OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
     22 // DAMAGE.
     23 
     24 #ifndef WebGamepad_h
     25 #define WebGamepad_h
     26 
     27 #include "WebCommon.h"
     28 
     29 #if WEBKIT_IMPLEMENTATION
     30 #include <wtf/Assertions.h>
     31 #endif
     32 
     33 namespace WebKit {
     34 
     35 #pragma pack(push, 1)
     36 
     37 // This structure is intentionally POD and fixed size so that it can be shared
     38 // memory between hardware polling threads and the rest of the browser. See
     39 // also WebGamepads.h.
     40 class WebGamepad {
     41 public:
     42     static const size_t idLengthCap = 128;
     43     static const size_t axesLengthCap = 16;
     44     static const size_t buttonsLengthCap = 32;
     45 
     46     WebGamepad()
     47         : connected(false)
     48         , timestamp(0)
     49         , axesLength(0)
     50         , buttonsLength(0)
     51     {
     52         id[0] = 0;
     53     }
     54 
     55     // Is there a gamepad connected at this index?
     56     bool connected;
     57 
     58     // Device identifier (based on manufacturer, model, etc.).
     59     WebUChar id[idLengthCap];
     60 
     61     // Monotonically increasing value referring to when the data were last
     62     // updated.
     63     unsigned long long timestamp;
     64 
     65     // Number of valid entries in the axes array.
     66     unsigned axesLength;
     67 
     68     // Normalized values representing axes, in the range [-1..1].
     69     float axes[axesLengthCap];
     70 
     71     // Number of valid entries in the buttons array.
     72     unsigned buttonsLength;
     73 
     74     // Normalized values representing buttons, in the range [0..1].
     75     float buttons[buttonsLengthCap];
     76 };
     77 
     78 #if WEBKIT_IMPLEMENTATION
     79 COMPILE_ASSERT(sizeof(WebGamepad) == 465, WebGamepad_has_wrong_size);
     80 #endif
     81 
     82 #pragma pack(pop)
     83 
     84 }
     85 
     86 #endif // WebGamepad_h
     87