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 33namespace blink { 34 35#pragma pack(push, 1) 36 37class WebGamepadButton { 38public: 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. 56class WebGamepad { 57public: 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 100COMPILE_ASSERT(sizeof(WebGamepad) == 721, WebGamepad_has_wrong_size); 101#endif 102 103#pragma pack(pop) 104 105} 106 107#endif // WebGamepad_h 108