| 1 | // Copyright (c) 2019 OPEN CASCADE SAS |
| 2 | // |
| 3 | // This file is part of the examples of the Open CASCADE Technology software library. |
| 4 | // |
| 5 | // Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | // of this software and associated documentation files (the "Software"), to deal |
| 7 | // in the Software without restriction, including without limitation the rights |
| 8 | // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | // copies of the Software, and to permit persons to whom the Software is |
| 10 | // furnished to do so, subject to the following conditions: |
| 11 | // |
| 12 | // The above copyright notice and this permission notice shall be included in all |
| 13 | // copies or substantial portions of the Software. |
| 14 | // |
| 15 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 18 | // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE |
| 21 | |
| 22 | #ifndef _WasmOcctView_HeaderFile |
| 23 | #define _WasmOcctView_HeaderFile |
| 24 | |
| 25 | #include <AIS_InteractiveContext.hxx> |
| 26 | #include <AIS_ViewController.hxx> |
| 27 | #include <V3d_View.hxx> |
| 28 | |
| 29 | #include <emscripten.h> |
| 30 | #include <emscripten/html5.h> |
| 31 | |
| 32 | class AIS_ViewCube; |
| 33 | |
| 34 | //! Sample class creating 3D Viewer within Emscripten canvas. |
| 35 | class WasmOcctView : protected AIS_ViewController |
| 36 | { |
| 37 | public: |
| 38 | //! Default constructor. |
| 39 | WasmOcctView(); |
| 40 | |
| 41 | //! Destructor. |
| 42 | virtual ~WasmOcctView(); |
| 43 | |
| 44 | //! Main application entry point. |
| 45 | void run(); |
| 46 | |
| 47 | //! Return interactive context. |
| 48 | const Handle(AIS_InteractiveContext)& Context() const { return myContext; } |
| 49 | |
| 50 | //! Return view. |
| 51 | const Handle(V3d_View)& View() const { return myView; } |
| 52 | |
| 53 | //! Return device pixel ratio for handling high DPI displays. |
| 54 | float DevicePixelRatio() const { return myDevicePixelRatio; } |
| 55 | |
| 56 | private: |
| 57 | |
| 58 | //! Create window. |
| 59 | void initWindow(); |
| 60 | |
| 61 | //! Create 3D Viewer. |
| 62 | bool initViewer(); |
| 63 | |
| 64 | //! Fill 3D Viewer with a DEMO items. |
| 65 | void initDemoScene(); |
| 66 | |
| 67 | //! Application event loop. |
| 68 | void mainloop(); |
| 69 | |
| 70 | //! Request view redrawing. |
| 71 | void updateView(); |
| 72 | |
| 73 | //! Flush events and redraw view. |
| 74 | void redrawView(); |
| 75 | |
| 76 | //! Handle view redraw. |
| 77 | virtual void handleViewRedraw (const Handle(AIS_InteractiveContext)& theCtx, |
| 78 | const Handle(V3d_View)& theView) override; |
| 79 | |
| 80 | //! Dump WebGL context information. |
| 81 | void dumpGlInfo (bool theIsBasic); |
| 82 | |
| 83 | //! Initialize pixel scale ratio. |
| 84 | void initPixelScaleRatio(); |
| 85 | |
| 86 | //! Return point from logical units to backing store. |
| 87 | Graphic3d_Vec2d convertPointToBacking (const Graphic3d_Vec2d& thePnt) const |
| 88 | { |
| 89 | return thePnt * myDevicePixelRatio; |
| 90 | } |
| 91 | |
| 92 | //! Return point from logical units to backing store. |
| 93 | Graphic3d_Vec2i convertPointToBacking (const Graphic3d_Vec2i& thePnt) const |
| 94 | { |
| 95 | Graphic3d_Vec2d aPnt = Graphic3d_Vec2d (thePnt) * myDevicePixelRatio + Graphic3d_Vec2d (0.5); |
| 96 | return Graphic3d_Vec2i (aPnt); |
| 97 | } |
| 98 | |
| 99 | //! @name Emscripten callbacks |
| 100 | private: |
| 101 | //! Window resize event. |
| 102 | EM_BOOL onResizeEvent (int theEventType, const EmscriptenUiEvent* theEvent); |
| 103 | |
| 104 | //! Mouse event. |
| 105 | EM_BOOL onMouseEvent (int theEventType, const EmscriptenMouseEvent* theEvent); |
| 106 | |
| 107 | //! Scroll event. |
| 108 | EM_BOOL onWheelEvent (int theEventType, const EmscriptenWheelEvent* theEvent); |
| 109 | |
| 110 | //! Touch event. |
| 111 | EM_BOOL onTouchEvent (int theEventType, const EmscriptenTouchEvent* theEvent); |
| 112 | |
| 113 | //! Key down event. |
| 114 | EM_BOOL onKeyDownEvent (int theEventType, const EmscriptenKeyboardEvent* theEvent); |
| 115 | |
| 116 | //! Key up event. |
| 117 | EM_BOOL onKeyUpEvent (int theEventType, const EmscriptenKeyboardEvent* theEvent); |
| 118 | |
| 119 | //! @name Emscripten callbacks (static functions) |
| 120 | private: |
| 121 | |
| 122 | static EM_BOOL onResizeCallback (int theEventType, const EmscriptenUiEvent* theEvent, void* theView) |
| 123 | { return ((WasmOcctView* )theView)->onResizeEvent (theEventType, theEvent); } |
| 124 | |
| 125 | static void onRedrawView (void* theView) |
| 126 | { return ((WasmOcctView* )theView)->redrawView(); } |
| 127 | |
| 128 | static EM_BOOL onMouseCallback (int theEventType, const EmscriptenMouseEvent* theEvent, void* theView) |
| 129 | { return ((WasmOcctView* )theView)->onMouseEvent (theEventType, theEvent); } |
| 130 | |
| 131 | static EM_BOOL onWheelCallback (int theEventType, const EmscriptenWheelEvent* theEvent, void* theView) |
| 132 | { return ((WasmOcctView* )theView)->onWheelEvent (theEventType, theEvent); } |
| 133 | |
| 134 | static EM_BOOL onTouchCallback (int theEventType, const EmscriptenTouchEvent* theEvent, void* theView) |
| 135 | { return ((WasmOcctView* )theView)->onTouchEvent (theEventType, theEvent); } |
| 136 | |
| 137 | static EM_BOOL onKeyDownCallback (int theEventType, const EmscriptenKeyboardEvent* theEvent, void* theView) |
| 138 | { return ((WasmOcctView* )theView)->onKeyDownEvent (theEventType, theEvent); } |
| 139 | |
| 140 | static EM_BOOL onKeyUpCallback (int theEventType, const EmscriptenKeyboardEvent* theEvent, void* theView) |
| 141 | { return ((WasmOcctView* )theView)->onKeyUpEvent (theEventType, theEvent); } |
| 142 | |
| 143 | private: |
| 144 | |
| 145 | Handle(AIS_InteractiveContext) myContext; //!< interactive context |
| 146 | Handle(V3d_View) myView; //!< 3D view |
| 147 | Handle(Prs3d_TextAspect) myTextStyle; //!< text style for OSD elements |
| 148 | Handle(AIS_ViewCube) myViewCube; //!< view cube object |
| 149 | TCollection_AsciiString myCanvasId; //!< canvas element id on HTML page |
| 150 | Aspect_Touch myClickTouch; //!< single touch position for handling clicks |
| 151 | OSD_Timer myDoubleTapTimer; //!< timer for handling double tap |
| 152 | float myDevicePixelRatio; //!< device pixel ratio for handling high DPI displays |
| 153 | unsigned int myUpdateRequests; //!< counter for unhandled update requests |
| 154 | |
| 155 | }; |
| 156 | |
| 157 | #endif // _WasmOcctView_HeaderFile |