Mercurial > hg > orthanc-stone
diff Framework/Viewport/WebGLViewport.cpp @ 1232:a28861abf888 broker
viewports for WebAssembly
author | Sebastien Jodogne <s.jodogne@gmail.com> |
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date | Mon, 09 Dec 2019 17:46:33 +0100 |
parents | |
children | 0ca50d275b9a |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Framework/Viewport/WebGLViewport.cpp Mon Dec 09 17:46:33 2019 +0100 @@ -0,0 +1,105 @@ +/** + * Stone of Orthanc + * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics + * Department, University Hospital of Liege, Belgium + * Copyright (C) 2017-2019 Osimis S.A., Belgium + * + * This program is free software: you can redistribute it and/or + * modify it under the terms of the GNU Affero General Public License + * as published by the Free Software Foundation, either version 3 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + **/ + + +#include "WebGLViewport.h" + +#include "../StoneException.h" +#include "../Scene2D/OpenGLCompositor.h" + +namespace OrthancStone +{ + void WebGLViewport::Paint(ICompositor& compositor, + ViewportController& controller) + { + try + { + compositor.Refresh(controller.GetScene()); + + /** + * No need to manually swap the buffer: "Rendered WebGL content + * is implicitly presented (displayed to the user) on the canvas + * when the event handler that renders with WebGL returns back + * to the browser event loop." + * https://emscripten.org/docs/api_reference/html5.h.html#webgl-context + * + * Could call "emscripten_webgl_commit_frame()" if + * "explicitSwapControl" option were set to "true". + **/ + } + catch (const StoneException& e) + { + // Ignore problems about the loss of the WebGL context (edge case) + if (e.GetErrorCode() == ErrorCode_WebGLContextLost) + { + return; + } + else + { + throw; + } + } + } + + + void WebGLViewport::UpdateSize(ICompositor& compositor) + { + try + { + context_.UpdateSize(); + } + catch (const StoneException& e) + { + // Ignore problems about the loss of the WebGL context (edge case) + if (e.GetErrorCode() == ErrorCode_WebGLContextLost) + { + return; + } + else + { + throw; + } + } + } + + + WebGLViewport::WebGLViewport(const std::string& canvasId) : + WebAssemblyViewport(canvasId, NULL), + context_(GetFullCanvasId()) + { + AcquireCompositor(new OpenGLCompositor(context_)); + } + + + WebGLViewport::WebGLViewport(const std::string& canvasId, + const Scene2D& scene) : + WebAssemblyViewport(canvasId, &scene), + context_(GetFullCanvasId()) + { + AcquireCompositor(new OpenGLCompositor(context_)); + } + + + WebGLViewport::~WebGLViewport() + { + // Make sure to delete the compositor before its parent "context_" gets deleted + ClearCompositor(); + } +}