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backends/platform/sdl/emscripten/emscripten.cpp
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261
backends/platform/sdl/emscripten/emscripten.cpp
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifdef __EMSCRIPTEN__
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#define FORBIDDEN_SYMBOL_EXCEPTION_FILE
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#define FORBIDDEN_SYMBOL_EXCEPTION_getenv
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#include <emscripten.h>
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#include "backends/events/emscriptensdl/emscriptensdl-events.h"
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#include "backends/fs/emscripten/emscripten-fs-factory.h"
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#include "backends/mutex/null/null-mutex.h"
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#include "backends/fs/emscripten/emscripten-fs-factory.h"
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#include "backends/platform/sdl/emscripten/emscripten.h"
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#include "backends/timer/default/default-timer.h"
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#include "common/file.h"
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#ifdef USE_TTS
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#include "backends/text-to-speech/emscripten/emscripten-text-to-speech.h"
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#endif
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// Inline JavaScript, see https://emscripten.org/docs/api_reference/emscripten.h.html#inline-assembly-javascript for details
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EM_JS(bool, isFullscreen, (), {
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return !!document.fullscreenElement;
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});
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EM_JS(void, toggleFullscreen, (bool enable), {
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let canvas = document.getElementById('canvas');
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if (enable && !document.fullscreenElement) {
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canvas.requestFullscreen();
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}
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if (!enable && document.fullscreenElement) {
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document.exitFullscreen();
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}
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});
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EM_JS(void, downloadFile, (const char *filenamePtr, char *dataPtr, int dataSize), {
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const view = new Uint8Array(Module.HEAPU8.buffer, dataPtr, dataSize);
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const blob = new Blob([view], {
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type:
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'octet/stream'
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});
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const filename = UTF8ToString(filenamePtr);
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setTimeout(() => {
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const a = document.createElement('a');
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a.style = 'display:none';
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document.body.appendChild(a);
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const url = window.URL.createObjectURL(blob);
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a.href = url;
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a.download = filename;
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a.click();
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window.URL.revokeObjectURL(url);
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document.body.removeChild(a);
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}, 0);
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});
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#ifdef USE_CLOUD
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/* Listener to feed the activation JSON from the wizard at cloud.scummvm.org back
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* Usage: Run the following on the final page of the activation flow:
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* window.opener.postMessage(document.getElementById("json").value,"*")
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*/
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EM_JS(bool, cloud_connection_open_oauth_window, (char const *url), {
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oauth_window = window.open(UTF8ToString(url));
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window.addEventListener("message", (event) => {
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Module._cloud_connection_json_callback(stringToNewUTF8( JSON.stringify(event.data)));
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oauth_window.close()
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}, {once : true});
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return true;
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});
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#endif
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extern "C" {
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#ifdef USE_CLOUD
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void EMSCRIPTEN_KEEPALIVE cloud_connection_json_callback(char *str) {
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warning("cloud_connection_callback: %s", str);
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OSystem_Emscripten *emscripten_g_system = dynamic_cast<OSystem_Emscripten *>(g_system);
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if (emscripten_g_system->_cloudConnectionCallback) {
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(*emscripten_g_system->_cloudConnectionCallback)(new Common::String(str));
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} else {
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warning("No Storage Connection Callback Registered!");
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}
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}
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#endif
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}
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// Overridden functions
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void OSystem_Emscripten::initBackend() {
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#ifdef USE_TTS
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// Initialize Text to Speech manager
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_textToSpeechManager = new EmscriptenTextToSpeechManager();
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#endif
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// SDL Timers don't work in Emscripten unless threads are enabled or Asyncify is disabled.
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// We can do neither, so we use the DefaultTimerManager instead.
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_timerManager = new DefaultTimerManager();
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// Event source
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_eventSource = new EmscriptenSdlEventSource();
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// Invoke parent implementation of this method
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OSystem_POSIX::initBackend();
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}
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void OSystem_Emscripten::init() {
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// Initialze File System Factory
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EmscriptenFilesystemFactory *fsFactory = new EmscriptenFilesystemFactory();
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_fsFactory = fsFactory;
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// Invoke parent implementation of this method
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OSystem_SDL::init();
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}
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bool OSystem_Emscripten::hasFeature(Feature f) {
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if (f == kFeatureFullscreenMode)
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return true;
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if (f == kFeatureNoQuit)
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return true;
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return OSystem_POSIX::hasFeature(f);
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}
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bool OSystem_Emscripten::getFeatureState(Feature f) {
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if (f == kFeatureFullscreenMode) {
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return isFullscreen();
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} else {
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return OSystem_POSIX::getFeatureState(f);
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}
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}
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void OSystem_Emscripten::setFeatureState(Feature f, bool enable) {
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if (f == kFeatureFullscreenMode) {
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toggleFullscreen(enable);
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} else {
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OSystem_POSIX::setFeatureState(f, enable);
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}
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}
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Common::Path OSystem_Emscripten::getDefaultLogFileName() {
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return Common::Path("/tmp/scummvm.log");
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}
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Common::Path OSystem_Emscripten::getDefaultConfigFileName() {
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return Common::Path(Common::String::format("%s/scummvm.ini", getenv("HOME")));
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}
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Common::Path OSystem_Emscripten::getScreenshotsPath() {
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return Common::Path("/tmp/");
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}
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Common::Path OSystem_Emscripten::getDefaultIconsPath() {
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return Common::Path(DATA_PATH"/gui-icons/");
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}
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bool OSystem_Emscripten::displayLogFile() {
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if (_logFilePath.empty())
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return false;
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exportFile(_logFilePath);
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return true;
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}
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#ifdef USE_OPENGL
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OSystem_SDL::GraphicsManagerType OSystem_Emscripten::getDefaultGraphicsManager() const {
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return GraphicsManagerOpenGL;
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}
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#endif
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void OSystem_Emscripten::exportFile(const Common::Path &filename) {
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Common::File file;
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Common::FSNode node(filename);
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file.open(node);
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if (!file.isOpen()) {
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warning("Could not open file %s!", filename.toString(Common::Path::kNativeSeparator).c_str());
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return;
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}
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Common::String exportName = filename.getLastComponent().toString(Common::Path::kNativeSeparator);
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const int32 size = file.size();
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char *bytes = new char[size + 1];
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file.read(bytes, size);
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file.close();
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downloadFile(exportName.c_str(), bytes, size);
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delete[] bytes;
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}
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void OSystem_Emscripten::updateTimers() {
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// avoid a recursion loop if a timer callback decides to call OSystem::delayMillis()
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static bool inTimer = false;
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if (!inTimer) {
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inTimer = true;
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((DefaultTimerManager *)_timerManager)->checkTimers();
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inTimer = false;
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} else {
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const Common::ConfigManager::Domain *activeDomain = ConfMan.getActiveDomain();
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assert(activeDomain);
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warning("%s/%s calls update() from timer",
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activeDomain->getValOrDefault("engineid").c_str(),
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activeDomain->getValOrDefault("gameid").c_str());
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}
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}
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Common::MutexInternal *OSystem_Emscripten::createMutex() {
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return new NullMutexInternal();
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}
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void OSystem_Emscripten::addSysArchivesToSearchSet(Common::SearchSet &s, int priority) {
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// Add the global DATA_PATH (and some sub-folders) to the directory search list
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// Note: gui-icons folder is added in GuiManager::initIconsSet
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Common::FSNode dataNode(DATA_PATH);
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if (dataNode.exists() && dataNode.isDirectory()) {
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s.addDirectory(dataNode, priority, 2, false);
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}
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}
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void OSystem_Emscripten::delayMillis(uint msecs) {
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static uint32 lastThreshold = 0;
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const uint32 threshold = getMillis() + msecs;
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if (msecs == 0 && threshold - lastThreshold < 10) {
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return;
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}
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uint32 pause = 0;
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do {
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#ifdef ENABLE_EVENTRECORDER
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if (!g_eventRec.processDelayMillis())
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#endif
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SDL_Delay(pause);
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updateTimers();
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pause = getMillis() > threshold ? 0 : threshold - getMillis(); // Avoid negative values
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pause = pause > 10 ? 10 : pause; // ensure we don't pause for too long
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} while (pause > 0);
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lastThreshold = threshold;
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}
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#ifdef USE_CLOUD
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bool OSystem_Emscripten::openUrl(const Common::String &url) {
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if(url.hasPrefix("https://cloud.scummvm.org/")){
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return cloud_connection_open_oauth_window(url.c_str());
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}
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return OSystem_SDL::openUrl(url);
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}
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#endif
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#endif
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