git.sesse.net Git - mlt/blob - src/modules/qt/consumer_qglsl.cpp

   1 /*
   2  * consumer_qglsl.cpp
   3  * Copyright (C) 2012-2014 Dan Dennedy <dan@dennedy.org>
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include <framework/mlt.h>
  21 #include <QApplication>
  22 #include <QLocale>
  23 #include <QGLWidget>
  24 #include <QMutex>
  25 #include <QWaitCondition>
  26 #include <QtGlobal>
  27
  28 #if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
  29 #include <X11/Xlib.h>
  30 #endif
  31
  32 #if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
  33
  34 class GLWidget : public QGLWidget
  35 {
  36 private:
  37         QGLWidget *renderContext;
  38         bool isInitialized;
  39         QMutex mutex;
  40         QWaitCondition condition;
  41
  42 public:
  43         GLWidget()
  44 #ifdef Q_OS_MAC
  45                 : QGLWidget()
  46 #else
  47                 : QGLWidget(0, 0, Qt::SplashScreen)
  48 #endif
  49                 , renderContext(0)
  50                 , isInitialized(false)
  51         {
  52                 resize(0, 0);
  53                 show();
  54         }
  55
  56         ~GLWidget()
  57         {
  58                 delete renderContext;
  59         }
  60
  61         bool createRenderContext()
  62         {
  63                 if (!isInitialized) {
  64                         mutex.lock();
  65                         condition.wait(&mutex);
  66                         mutex.unlock();
  67                 }
  68                 if (!renderContext) {
  69                         renderContext = new QGLWidget(0, this, Qt::SplashScreen);
  70                         renderContext->resize(0, 0);
  71                         renderContext->makeCurrent();
  72                 }
  73                 return renderContext->isValid();
  74         }
  75
  76 protected:
  77         void initializeGL()
  78         {
  79                 condition.wakeAll();
  80                 isInitialized = true;
  81         }
  82 };
  83
  84 #else // Qt 5
  85
  86 #include <QThread>
  87 #include <QOpenGLContext>
  88 #include <QOffscreenSurface>
  89
  90 typedef void* ( *thread_function_t )( void* );
  91
  92 class RenderThread : public QThread
  93 {
  94 public:
  95         RenderThread(thread_function_t function, void *data)
  96                 : QThread(0)
  97                 , m_function(function)
  98                 , m_data(data)
  99         {
 100                 m_context = new QOpenGLContext;
 101                 m_context->create();
 102                 m_context->moveToThread(this);
 103                 m_surface = new QOffscreenSurface();
 104                 m_surface->create();
 105         }
 106         ~RenderThread()
 107         {
 108                 m_surface->destroy();
 109                 delete m_surface;
 110         }
 111
 112 protected:
 113         void run()
 114         {
 115                 Q_ASSERT(m_context->isValid());
 116                 m_context->makeCurrent(m_surface);
 117                 m_function(m_data);
 118                 m_context->doneCurrent();
 119                 delete m_context;
 120         }
 121
 122 private:
 123         thread_function_t m_function;
 124         void* m_data;
 125         QOpenGLContext* m_context;
 126         QOffscreenSurface* m_surface;
 127 };
 128
 129 static void onThreadCreate(mlt_properties owner, mlt_consumer self,
 130         RenderThread** thread, int* priority, thread_function_t function, void* data )
 131 {
 132         Q_UNUSED(owner)
 133         Q_UNUSED(priority)
 134         (*thread) = new RenderThread(function, data);
 135         (*thread)->start();
 136 }
 137
 138 static void onThreadJoin(mlt_properties owner, mlt_consumer self, RenderThread* thread)
 139 {
 140         Q_UNUSED(owner)
 141         Q_UNUSED(self)
 142         if (thread) {
 143                 thread->quit();
 144                 thread->wait();
 145                 qApp->processEvents();
 146                 delete thread;
 147         }
 148 }
 149
 150 #endif // Qt 5
 151
 152 static void onThreadStarted(mlt_properties owner, mlt_consumer consumer)
 153 {
 154         mlt_service service = MLT_CONSUMER_SERVICE(consumer);
 155         mlt_properties properties = MLT_CONSUMER_PROPERTIES(consumer);
 156         mlt_filter filter = (mlt_filter) mlt_properties_get_data(properties, "glslManager", NULL);
 157         mlt_properties filter_properties = MLT_FILTER_PROPERTIES(filter);
 158
 159         mlt_log_debug(service, "%s\n", __FUNCTION__);
 160 #if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
 161         GLWidget *widget = (GLWidget*) mlt_properties_get_data(properties, "GLWidget", NULL);
 162         if (widget->createRenderContext()) {
 163 #else
 164         {
 165 #endif
 166                 mlt_events_fire(filter_properties, "init glsl", NULL);
 167                 if (!mlt_properties_get_int(filter_properties, "glsl_supported")) {
 168                         mlt_log_fatal(service,
 169                                 "OpenGL Shading Language rendering is not supported on this machine.\n" );
 170                         mlt_events_fire(properties, "consumer-fatal-error", NULL);
 171                 }
 172         }
 173 }
 174
 175 static void onThreadStopped(mlt_properties owner, mlt_consumer consumer)
 176 {
 177         mlt_properties properties = MLT_CONSUMER_PROPERTIES(consumer);
 178         mlt_filter filter = (mlt_filter) mlt_properties_get_data(properties, "glslManager", NULL);
 179         mlt_events_fire(MLT_FILTER_PROPERTIES(filter), "close glsl", NULL);
 180 }
 181
 182 static void onCleanup(mlt_properties owner, mlt_consumer consumer)
 183 {
 184 #if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
 185         GLWidget* widget = (GLWidget*) mlt_properties_get_data( MLT_CONSUMER_PROPERTIES(consumer), "GLWidget", NULL);
 186         delete widget;
 187         mlt_properties_set_data(MLT_CONSUMER_PROPERTIES(consumer), "GLWidget", NULL, 0, NULL, NULL);
 188         qApp->processEvents();
 189 #endif
 190 }
 191
 192 extern "C" {
 193
 194 mlt_consumer consumer_qglsl_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
 195 {
 196         mlt_consumer consumer = mlt_factory_consumer(profile, "multi", arg);
 197         if (consumer) {
 198                 mlt_filter filter = mlt_factory_filter(profile, "glsl.manager", 0);
 199                 if (filter) {
 200                         mlt_properties properties = MLT_CONSUMER_PROPERTIES(consumer);
 201                         mlt_properties_set_data(properties, "glslManager", filter, 0, (mlt_destructor) mlt_filter_close, NULL);
 202                         mlt_events_register( properties, "consumer-cleanup", NULL );
 203                         mlt_events_listen(properties, consumer, "consumer-thread-started", (mlt_listener) onThreadStarted);
 204                         mlt_events_listen(properties, consumer, "consumer-thread-stopped", (mlt_listener) onThreadStopped);
 205                         mlt_events_listen(properties, consumer, "consumer-cleanup", (mlt_listener) onCleanup);
 206 #if defined(Q_OS_UNIX) && !defined(Q_OS_MAC)
 207                         XInitThreads();
 208                         if ( getenv("DISPLAY") == 0 ) {
 209                                 mlt_log_error(MLT_CONSUMER_SERVICE(consumer), "The qglsl consumer requires a X11 environment.\nPlease either run melt from an X session or use a fake X server like xvfb:\nxvfb-run -a melt (...)\n" );
 210                         } else
 211 #endif
 212                         if (!qApp) {
 213                                 int argc = 1;
 214                                 char* argv[1];
 215                                 argv[0] = (char*) "MLT qglsl consumer";
 216                                 new QApplication(argc, argv);
 217                                 const char *localename = mlt_properties_get_lcnumeric(properties);
 218                                 QLocale::setDefault(QLocale(localename));
 219                         }
 220 #if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
 221                         mlt_properties_set_data(properties, "GLWidget", new GLWidget, 0, NULL, NULL);
 222 #else
 223                         mlt_events_listen(properties, consumer, "consumer-thread-create", (mlt_listener) onThreadCreate);
 224                         mlt_events_listen(properties, consumer, "consumer-thread-join", (mlt_listener) onThreadJoin);
 225 #endif
 226                         qApp->processEvents();
 227                         return consumer;
 228                 }
 229                 mlt_consumer_close(consumer);
 230         }
 231         return NULL;
 232 }
 233
 234 }