Mercurial > hg > orthanc-stone
view Framework/OpenGL/WebAssemblyOpenGLContext.cpp @ 702:c0a5eb9a4290 refactor-viewport-controller
Merge from default
author | Benjamin Golinvaux <bgo@osimis.io> |
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date | Sun, 19 May 2019 16:29:50 +0200 |
parents | 7efa2543699d |
children | 0aff28f15ea2 |
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/** * 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 "WebAssemblyOpenGLContext.h" #if ORTHANC_ENABLE_WASM == 1 #include <Core/OrthancException.h> #include <emscripten/html5.h> #include <boost/math/special_functions/round.hpp> namespace OrthancStone { namespace OpenGL { class WebAssemblyOpenGLContext::PImpl { private: std::string canvas_; EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context_; unsigned int canvasWidth_; unsigned int canvasHeight_; public: PImpl(const std::string& canvas) : canvas_(canvas) { // Context configuration EmscriptenWebGLContextAttributes attr; emscripten_webgl_init_context_attributes(&attr); context_ = emscripten_webgl_create_context(canvas.c_str(), &attr); if (context_ < 0) { throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, "Cannot create an OpenGL context for canvas: " + canvas); } UpdateSize(); } ~PImpl() { emscripten_webgl_destroy_context(context_); } const std::string& GetCanvasIdentifier() const { return canvas_; } void MakeCurrent() { if (emscripten_webgl_make_context_current(context_) != EMSCRIPTEN_RESULT_SUCCESS) { throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, "Cannot set the OpenGL context"); } } void SwapBuffer() { /** * "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". **/ } unsigned int GetCanvasWidth() const { return canvasWidth_; } unsigned int GetCanvasHeight() const { return canvasHeight_; } void UpdateSize() { double w, h; emscripten_get_element_css_size(canvas_.c_str(), &w, &h); /** * Emscripten has the function emscripten_get_element_css_size() * to query the width and height of a named HTML element. I'm * calling this first to get the initial size of the canvas DOM * element, and then call emscripten_set_canvas_size() to * initialize the framebuffer size of the canvas to the same * size as its DOM element. * https://floooh.github.io/2017/02/22/emsc-html.html **/ if (w <= 0 || h <= 0) { canvasWidth_ = 0; canvasHeight_ = 0; } else { canvasWidth_ = static_cast<unsigned int>(boost::math::iround(w)); canvasHeight_ = static_cast<unsigned int>(boost::math::iround(h)); } emscripten_set_canvas_element_size(canvas_.c_str(), canvasWidth_, canvasHeight_); } }; WebAssemblyOpenGLContext::WebAssemblyOpenGLContext(const std::string& canvas) : pimpl_(new PImpl(canvas)) { } void WebAssemblyOpenGLContext::MakeCurrent() { assert(pimpl_.get() != NULL); pimpl_->MakeCurrent(); } void WebAssemblyOpenGLContext::SwapBuffer() { assert(pimpl_.get() != NULL); pimpl_->SwapBuffer(); } unsigned int WebAssemblyOpenGLContext::GetCanvasWidth() const { assert(pimpl_.get() != NULL); return pimpl_->GetCanvasWidth(); } unsigned int WebAssemblyOpenGLContext::GetCanvasHeight() const { assert(pimpl_.get() != NULL); return pimpl_->GetCanvasHeight(); } void WebAssemblyOpenGLContext::UpdateSize() { assert(pimpl_.get() != NULL); pimpl_->UpdateSize(); } const std::string& WebAssemblyOpenGLContext::GetCanvasIdentifier() const { assert(pimpl_.get() != NULL); return pimpl_->GetCanvasIdentifier(); } } } #endif