mirror of
https://git.dev.opencascade.org/repos/occt.git
synced 2025-04-04 18:06:22 +03:00
7465bfa65e
OpenGl_Context now skips loading functions related to mapping buffer, which are required by OpenGL ES 3.0 specs but not provided by WebGL 2.0. Message_PrinterSystemLog does not use a broken emscripten_log() anymore, which corrupted UNICODE strings. WasmOcctView::initWindow() - callbacks now set using EMSCRIPTEN_EVENT_TARGET_WINDOW instead of 0 used by older Emscripten API. Mouse callbacks now track canvas element and use EmscriptenMouseEvent::targetX/targetY instead of ::canvasX/canvasY as the latter was broken. Added emscripten_set_main_loop() setup to shut up eglSwapInterval() error message. Fixed missing \0 at the end of string converted by toUtf8Array().
107 lines
3.6 KiB
HTML
107 lines
3.6 KiB
HTML
<!DOCTYPE html>
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<html lang=en-us>
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<head>
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<meta charset=utf-8><meta content="text/html; charset=utf-8" http-equiv=Content-Type>
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<link rel="shortcut icon" href="lamp.ico" type="image/x-icon" />
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<title>OCCT WebGL Viewer Sample</title>
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</head>
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<body>
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<h2>OCCT WebGL Viewer Sample</h2>
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<div>
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<canvas id=canvas oncontextmenu=event.preventDefault() tabindex=-1 style="border:0 none;background-color:#000" width="409" height="409"></canvas>
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<img id=occlogo src="OCC_logo.png" style="position: absolute; left: 20px; top: 0px; z-index: 2;" />
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</div>
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<div><label for="fileInput">Choose BREP file to upload: </label><input type="file" id="fileInput" accept=".brep"></div>
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<h4>Console output:</h4>
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<p id="output"></p>
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<script>
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//! Resize canvas to fit into window.
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function updateCanvasSize()
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{
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// size of canvas in logical (density-independent) units
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var aSizeX = Math.min (window.innerWidth, window.screen.availWidth);
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var aSizeY = Math.min (window.innerHeight, window.screen.availHeight);
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aSizeX = Math.max (300, aSizeX - 30);
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aSizeY = Math.max (300, aSizeY / 2);
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canvas.style.width = aSizeX + "px";
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canvas.style.height = aSizeY + "px";
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// drawing buffer size (aka backing store)
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var aDevicePixelRatio = window.devicePixelRatio || 1;
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canvas.width = aSizeX * aDevicePixelRatio;
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canvas.height = aSizeY * aDevicePixelRatio;
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occlogo.style.top = (aSizeY - 30) + "px";
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}
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window.onresize = updateCanvasSize;
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updateCanvasSize();
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//! Check browser support.
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function isWasmSupported()
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{
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try {
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if (typeof WebAssembly === "object"
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&& typeof WebAssembly.instantiate === "function") {
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const aDummyModule = new WebAssembly.Module (Uint8Array.of (0x0, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00));
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if (aDummyModule instanceof WebAssembly.Module)
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{
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return new WebAssembly.Instance(aDummyModule) instanceof WebAssembly.Instance;
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}
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}
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} catch (e) {}
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return false;
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}
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if (!isWasmSupported())
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{
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var anElement = document.getElementById('output');
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anElement.innerHTML += "Browser is too old - WebAssembly support is missing!<br>Please check updates or install a modern browser.<br>";
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}
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//! Define OCCT WebGL Viewer module.
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var Module =
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{
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print: (function() {
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var anElement = document.getElementById('output');
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return function(theText) { anElement.innerHTML += theText + "<br>"; };
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})(),
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printErr: function(theText) {
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//var anElement = document.getElementById('output');
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//anElement.innerHTML += theText + "<br>";
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console.warn(theText);
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},
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canvas: (function() {
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var aCanvas = document.getElementById('canvas');
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return aCanvas;
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})()
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};
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//! Handle file uploading.
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fileInput.onchange = function()
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{
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if (fileInput.files.length == 0) { return; }
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// Warning! Entire file is pre-loaded into memory.
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var aFile = fileInput.files[0];
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var aReader = new FileReader();
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aReader.onload = function()
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{
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var aNameLenBytes = lengthBytesUTF8(aFile.name) + 1;
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const aNameBuffer = Module._malloc(aNameLenBytes);
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stringToUTF8(aFile.name, aNameBuffer, aNameLenBytes);
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var aDataArray = new Uint8Array (aReader.result);
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const aDataBuffer = Module._malloc(aDataArray.length);
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Module.HEAPU8.set(aDataArray, aDataBuffer);
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Module.ccall('onFileDataRead', null, ['number', 'number', 'number'], [aNameBuffer, aDataBuffer, aDataArray.length]);
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Module._free(aDataBuffer);
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Module._free(aNameBuffer);
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fileInput.value = '';
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};
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aReader.readAsArrayBuffer(aFile);
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};
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</script>
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<script type="text/javascript" src="occt-webgl-sample.js" charset="utf-8"></script>
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</body>
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</html>
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