gstreamer/tests/examples/gl/qt/qglwtextureshare/qglrenderer.cpp
2014-07-02 14:16:40 +10:00

234 lines
7.5 KiB
C++

/*
* GStreamer
* Copyright (C) 2009 Julien Isorce <julien.isorce@gmail.com>
* Copyright (C) 2009 Andrey Nechypurenko <andreynech@gmail.com>
* Copyright (C) 2010 Nuno Santos <nunosantos@imaginando.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include <QGLWidget>
#include <QApplication>
#include <QDebug>
#include <QCloseEvent>
#include <gst/video/video.h>
#include <gst/gl/gstglmemory.h>
#include "gstthread.h"
#include "qglrenderer.h"
#include "pipeline.h"
#if defined(Q_WS_MAC)
extern void *qt_current_nsopengl_context();
#endif
QGLRenderer::QGLRenderer(const QString &videoLocation,
QWidget *parent)
: QGLWidget(parent),
videoLoc(videoLocation),
gst_thread(NULL),
closing(false),
frame(NULL)
{
move(20, 10);
resize(640, 480);
}
QGLRenderer::~QGLRenderer()
{
}
void
QGLRenderer::initializeGL()
{
GstGLContext *context;
GstGLDisplay *display;
display = gst_gl_display_new ();
/* FIXME: Allow the choice at runtime */
#if GST_GL_HAVE_PLATFORM_WGL
context = gst_gl_context_new_wrapped (display, (guintptr) wglGetCurrentContext (), GST_GL_PLATFORM_WGL, GST_GL_API_OPENGL);
#elif GST_GL_HAVE_PLATFORM_CGL
context = gst_gl_context_new_wrapped (display, (guintptr) qt_current_nsopengl_context(), GST_GL_PLATFORM_CGL, GST_GL_API_OPENGL);
#elif GST_GL_HAVE_PLATFORM_GLX
context = gst_gl_context_new_wrapped (display, (guintptr) glXGetCurrentContext (), GST_GL_PLATFORM_GLX, GST_GL_API_OPENGL);
#endif
gst_object_unref (display);
// We need to unset Qt context before initializing gst-gl plugin.
// Otherwise the attempt to share gst-gl context with Qt will fail.
this->doneCurrent();
this->gst_thread =
new GstThread(context, this->videoLoc, SLOT(newFrame()), this);
this->makeCurrent();
QObject::connect(this->gst_thread, SIGNAL(finished()),
this, SLOT(close()));
QObject::connect(this, SIGNAL(closeRequested()),
this->gst_thread, SLOT(stop()), Qt::QueuedConnection);
qglClearColor(QApplication::palette().color(QPalette::Active,
QPalette::Window));
//glShadeModel(GL_FLAT);
//glEnable(GL_DEPTH_TEST);
//glEnable(GL_CULL_FACE);
glEnable(GL_TEXTURE_2D); // Enable Texture Mapping
this->gst_thread->start();
}
void
QGLRenderer::resizeGL(int width, int height)
{
// Reset The Current Viewport And Perspective Transformation
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, (GLfloat)width/(GLfloat)height, 0.1f, 100.0f);
glMatrixMode(GL_MODELVIEW);
}
void
QGLRenderer::newFrame()
{
Pipeline *pipeline = this->gst_thread->getPipeline();
if(!pipeline)
return;
/* frame is initialized as null */
if (this->frame)
pipeline->queue_output_buf.put(this->frame);
this->frame = pipeline->queue_input_buf.get();
/* direct call to paintGL (no queued) */
this->updateGL();
}
void
QGLRenderer::paintGL()
{
static GLfloat xrot = 0;
static GLfloat yrot = 0;
static GLfloat zrot = 0;
if (this->frame)
{
guint tex_id;
GstMemory *mem;
GstVideoInfo v_info;
GstVideoFrame v_frame;
GstVideoMeta *v_meta;
mem = gst_buffer_peek_memory (this->frame, 0);
v_meta = gst_buffer_get_video_meta (this->frame);
Q_ASSERT(gst_is_gl_memory (mem));
gst_video_info_set_format (&v_info, v_meta->format, v_meta->width,
v_meta->height);
gst_video_frame_map (&v_frame, &v_info, this->frame,
(GstMapFlags) (GST_MAP_READ | GST_MAP_GL));
tex_id = *(guint *) v_frame.data[0];
glEnable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, tex_id);
if(glGetError () != GL_NO_ERROR)
{
qDebug ("failed to bind texture that comes from gst-gl");
emit closeRequested();
return;
}
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
GL_CLAMP_TO_EDGE);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0f,0.0f,-5.0f);
glRotatef(xrot,1.0f,0.0f,0.0f);
glRotatef(yrot,0.0f,1.0f,0.0f);
glRotatef(zrot,0.0f,0.0f,1.0f);
glBegin(GL_QUADS);
// Front Face
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
// Back Face
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
// Top Face
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
// Bottom Face
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
// Right face
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
// Left Face
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
xrot+=0.3f;
yrot+=0.2f;
zrot+=0.4f;
glBindTexture(GL_TEXTURE_2D, 0);
gst_video_frame_unmap(&v_frame);
}
}
void
QGLRenderer::closeEvent(QCloseEvent* event)
{
if(this->closing == false)
{
this->closing = true;
emit closeRequested();
event->ignore();
}
}