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: WebGamepadButton()39 WebGamepadButton() 40 : pressed(false) 41 , value(0.) 42 { 43 } WebGamepadButton(bool pressed,double value)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 WebGamepad()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