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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 BLINK_IMPLEMENTATION
     30 #include "wtf/Assertions.h"
     31 #endif
     32 
     33 namespace blink {
     34 
     35 #pragma pack(push, 1)
     36 
     37 class WebGamepadButton {
     38 public:
     39     WebGamepadButton()
     40         : pressed(false)
     41         , value(0.)
     42     {
     43     }
     44     WebGamepadButton(bool pressed, double value)
     45         : pressed(pressed)
     46         , value(value)
     47     {
     48     }
     49     bool pressed;
     50     double value;
     51 };
     52 
     53 // This structure is intentionally POD and fixed size so that it can be shared
     54 // memory between hardware polling threads and the rest of the browser. See
     55 // also WebGamepads.h.
     56 class WebGamepad {
     57 public:
     58     static const size_t idLengthCap = 128;
     59     static const size_t mappingLengthCap = 16;
     60     static const size_t axesLengthCap = 16;
     61     static const size_t buttonsLengthCap = 32;
     62 
     63     WebGamepad()
     64         : connected(false)
     65         , timestamp(0)
     66         , axesLength(0)
     67         , buttonsLength(0)
     68     {
     69         id[0] = 0;
     70         mapping[0] = 0;
     71     }
     72 
     73     // Is there a gamepad connected at this index?
     74     bool connected;
     75 
     76     // Device identifier (based on manufacturer, model, etc.).
     77     WebUChar id[idLengthCap];
     78 
     79     // Monotonically increasing value referring to when the data were last
     80     // updated.
     81     unsigned long long timestamp;
     82 
     83     // Number of valid entries in the axes array.
     84     unsigned axesLength;
     85 
     86     // Normalized values representing axes, in the range [-1..1].
     87     double axes[axesLengthCap];
     88 
     89     // Number of valid entries in the buttons array.
     90     unsigned buttonsLength;
     91 
     92     // Button states
     93     WebGamepadButton buttons[buttonsLengthCap];
     94 
     95     // Mapping type (for example "standard")
     96     WebUChar mapping[mappingLengthCap];
     97 };
     98 
     99 #if BLINK_IMPLEMENTATION
    100 COMPILE_ASSERT(sizeof(WebGamepad) == 721, WebGamepad_has_wrong_size);
    101 #endif
    102 
    103 #pragma pack(pop)
    104 
    105 }
    106 
    107 #endif // WebGamepad_h
    108