tests/examples/gl/qt/qglwtextureshare/qglrenderer.cpp

   1 /*
   2  * GStreamer
   3  * Copyright (C) 2009 Julien Isorce <julien.isorce@gmail.com>
   4  * Copyright (C) 2009 Andrey Nechypurenko <andreynech@gmail.com>
   5  * Copyright (C) 2010 Nuno Santos <nunosantos@imaginando.net>
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the
  19  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
  20  * Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include <QGLWidget>
  24 #include <QApplication>
  25 #include <QCloseEvent>
  26
  27 #include <gst/video/video.h>
  28 #include <gst/gl/gstglmemory.h>
  29
  30 #include "gstthread.h"
  31 #include "qglrenderer.h"
  32 #include "pipeline.h"
  33
  34 #if defined(Q_WS_MAC)
  35 extern void *qt_current_nsopengl_context();
  36 #endif
  37
  38 QGLRenderer::QGLRenderer(const QString &videoLocation,
  39                          QWidget *parent)
  40   : QGLWidget(parent),
  41     videoLoc(videoLocation),
  42     gst_thread(NULL),
  43     closing(false),
  44     frame(NULL)
  45 {
  46     move(20, 10);
  47     resize(640, 480);
  48 }
  49
  50 QGLRenderer::~QGLRenderer()
  51 {
  52 }
  53
  54 void
  55 QGLRenderer::initializeGL()
  56 {
  57     GstGLContext *context;
  58     GstGLDisplay *display;
  59
  60     display = gst_gl_display_new ();
  61
  62     /* FIXME: Allow the choice at runtime */
  63 #if defined(GST_GL_HAVE_PLATFORM_WGL)
  64     context = gst_gl_context_new_wrapped (display, (guintptr) wglGetCurrentContext (), GST_GL_PLATFORM_WGL, GST_GL_API_OPENGL);
  65 #elif defined (GST_GL_HAVE_PLATFORM_CGL)
  66     context = gst_gl_context_new_wrapped (display, (guintptr) qt_current_nsopengl_context(), GST_GL_PLATFORM_CGL, GST_GL_API_OPENGL);
  67 #elif defined(GST_GL_HAVE_PLATFORM_GLX)
  68     context = gst_gl_context_new_wrapped (display, (guintptr) glXGetCurrentContext (), GST_GL_PLATFORM_GLX, GST_GL_API_OPENGL);
  69 #endif
  70     gst_object_unref (display);
  71
  72     // We need to unset Qt context before initializing gst-gl plugin.
  73     // Otherwise the attempt to share gst-gl context with Qt will fail.
  74     this->doneCurrent();
  75     this->gst_thread =
  76       new GstThread(context, this->videoLoc, SLOT(newFrame()), this);
  77     this->makeCurrent();
  78
  79     QObject::connect(this->gst_thread, SIGNAL(finished()),
  80                    this, SLOT(close()));
  81     QObject::connect(this, SIGNAL(closeRequested()),
  82                    this->gst_thread, SLOT(stop()), Qt::QueuedConnection);
  83
  84     qglClearColor(QApplication::palette().color(QPalette::Active,
  85                                                 QPalette::Window));
  86     //glShadeModel(GL_FLAT);
  87     //glEnable(GL_DEPTH_TEST);
  88     //glEnable(GL_CULL_FACE);
  89     glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
  90
  91     this->gst_thread->start();
  92 }
  93
  94 void
  95 QGLRenderer::resizeGL(int width, int height)
  96 {
  97   // Reset The Current Viewport And Perspective Transformation
  98   glViewport(0, 0, width, height);
  99
 100   glMatrixMode(GL_PROJECTION);
 101   glLoadIdentity();
 102
 103   gluPerspective(45.0f, (GLfloat)width/(GLfloat)height, 0.1f, 100.0f);
 104   glMatrixMode(GL_MODELVIEW);
 105 }
 106
 107 void
 108 QGLRenderer::newFrame()
 109 {
 110     Pipeline *pipeline = this->gst_thread->getPipeline();
 111     if(!pipeline)
 112       return;
 113
 114     /* frame is initialized as null */
 115     if (this->frame)
 116         pipeline->queue_output_buf.put(this->frame);
 117
 118     this->frame = pipeline->queue_input_buf.get();
 119
 120     /* direct call to paintGL (no queued) */
 121     this->updateGL();
 122 }
 123
 124 void
 125 QGLRenderer::paintGL()
 126 {
 127     static GLfloat      xrot = 0;
 128     static GLfloat      yrot = 0;
 129     static GLfloat      zrot = 0;
 130
 131     if (this->frame)
 132     {
 133         guint tex_id;
 134         GstMemory *mem;
 135         GstVideoInfo v_info;
 136         GstVideoFrame v_frame;
 137         GstVideoMeta *v_meta;
 138
 139         mem = gst_buffer_peek_memory (this->frame, 0);
 140         v_meta = gst_buffer_get_video_meta (this->frame);
 141
 142         if (gst_is_gl_memory (mem)) {
 143             gst_video_info_set_format (&v_info, v_meta->format, v_meta->width,
 144                 v_meta->height);
 145
 146             gst_video_frame_map (&v_frame, &v_info, this->frame,
 147                 (GstMapFlags) (GST_MAP_READ | GST_MAP_GL));
 148
 149             tex_id = *(guint *) v_frame.data[0];
 150         }
 151
 152         glEnable(GL_DEPTH_TEST);
 153
 154         glEnable(GL_TEXTURE_2D);
 155         glBindTexture(GL_TEXTURE_2D, tex_id);
 156         if(glGetError () != GL_NO_ERROR)
 157         {
 158           qDebug ("failed to bind texture that comes from gst-gl");
 159           emit closeRequested();
 160           return;
 161         }
 162
 163         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 164         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 165         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
 166                       GL_CLAMP_TO_EDGE);
 167         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
 168                       GL_CLAMP_TO_EDGE);
 169         glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 170
 171         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 172         glMatrixMode(GL_MODELVIEW);
 173         glLoadIdentity();
 174
 175         glTranslatef(0.0f,0.0f,-5.0f);
 176
 177         glRotatef(xrot,1.0f,0.0f,0.0f);
 178         glRotatef(yrot,0.0f,1.0f,0.0f);
 179         glRotatef(zrot,0.0f,0.0f,1.0f);
 180
 181         glBegin(GL_QUADS);
 182             // Front Face
 183             glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
 184             glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
 185             glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
 186             glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
 187             // Back Face
 188             glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
 189             glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
 190             glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
 191             glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
 192             // Top Face
 193             glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
 194             glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
 195             glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
 196             glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
 197             // Bottom Face
 198             glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
 199             glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
 200             glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
 201             glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
 202             // Right face
 203             glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
 204             glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,  1.0f, -1.0f);
 205             glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f,  1.0f,  1.0f);
 206             glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f,  1.0f);
 207             // Left Face
 208             glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
 209             glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f,  1.0f);
 210             glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,  1.0f,  1.0f);
 211             glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f,  1.0f, -1.0f);
 212         glEnd();
 213
 214         xrot+=0.3f;
 215         yrot+=0.2f;
 216         zrot+=0.4f;
 217
 218         glBindTexture(GL_TEXTURE_2D, 0);
 219     }
 220 }
 221
 222 void
 223 QGLRenderer::closeEvent(QCloseEvent* event)
 224 {
 225     if(this->closing == false)
 226     {
 227         this->closing = true;
 228         emit closeRequested();
 229         event->ignore();
 230     }
 231 }