Ogre's viewport wont update in real time

[ProgrammerAtHeart3344]

I'm not sure why but the viewports of Ogre don't update in realy time, i make a change then i have to resize the widget it's in to see the affect of the command.......Here's the class used for rendering/updating

@#include "stdafx.h"
#include "CRenderer.h"
#include "qwidget.h"

void CRenderer::clearViewport()
{
QColor Color2 = QColorDialog::getColor(Color,this);
Ogre::ColourValue cv;
cv.r = Color2.redF();
cv.b = Color2.blueF();
cv.g = Color2.greenF();
cv.a = 1.0;
this->m_pIViewport->setBackgroundColour(cv);
}
QPaintEngine* CRenderer::paintEngine() const
{
return 0;
}

void CRenderer::paintEvent(QPaintEvent* evt)
{
Ogre::Timer* time = m_pIRoot->getTimer();
time->reset();
Ogre::FrameEvent event;
event.timeSinceLastFrame += time->getMillisecondsCPU();
if(isInitialized)
{

Ogre::Root::getSingleton()._fireFrameStarted();
m_pIRenderWindow->update(true);
for (unsigned int X = 0; X < m_pIRenderWindow->getNumViewports(); ++X)
{
this->m_pIRenderWindow->getViewport(X)->update();
}
Ogre::Root::getSingleton()._fireFrameRenderingQueued();
Ogre::Root::getSingleton()._fireFrameEnded();

}

}

void CRenderer::resizeEvent(QResizeEvent* evt)
{
this->resize(this->parentWidget()->width(),this->parentWidget()->height());
if (m_pIRenderWindow)
{

m_pIRenderWindow->resize(this->parentWidget()->width(),this->parentWidget()->height());
m_pIRenderWindow->windowMovedOrResized();

for (unsigned short X = 0; X < m_pIRenderWindow->getNumViewports(); ++X)
{
Ogre::Viewport* views = m_pIRenderWindow->getViewport(X);
Ogre::Camera* cam = views->getCamera();
cam->setAspectRatio(static_castOgre::Real(views->getActualWidth())/static_castOgre::Real(views->getActualHeight()));
m_pIRenderWindow->_updateViewport(views);

}
}

}
bool CRenderer::DrawScene()
{

return true;

}

void CRenderer::mousePressEvent(QMouseEvent event)
{
Ogre::Entity Cube = m_pSceneMgr->getEntity("Ogre");
Ogre::SceneNode* N = Cube->getParentSceneNode();

if(event->buttons() & Qt::LeftButton)
{
m_pIRenderWindow->_beginUpdate();

N->pitch(-Ogre::Degree(lastPos.rx()));
N->yaw(-Ogre::Degree(lastPos.ry()));

m_pIViewport->update();
m_pIRenderWindow->_endUpdate();
}

}

void CRenderer::mouseReleaseEvent(QMouseEvent *event)
{

}

void CRenderer::mouseMoveEvent(QMouseEvent *event)
{

lastPos = event->pos();

}

void CRenderer::keyPressEvent(QKeyEvent *event)
{

if(event->key() == Qt::Key_A)
{
MessageBoxA(NULL,"","",MB_OK);
}

}

void CRenderer::keyReleaseEvent(QKeyEvent *event)
{

}

void CRenderer::contextMenuEvent(QContextMenuEvent *event)
{

}

void CRenderer::focusInEvent(QFocusEvent *fevent)
{
if (fevent->gotFocus() && fevent->reason() == QFocusEvent::ActiveWindow)
{
m_pIRenderWindow->_beginUpdate();
m_pIRenderWindow->setActive(true);
m_pIViewport->update();
m_pIRenderWindow->_endUpdate();
}
}

@

Yes, it's long...but if i can figure out how to fix it in this widget then making sure that the viewport updates in real time in all the other windows will be easy

[Taamalus]

Not sure if this helps, yet somewheres in your set up you should call, the startRendering method of the Root object. When and how is up to you. Without it, there is no trigger to repaint anything, unless an event forces a re-paint, i.e. when you change the size of the window screen.

[ProgrammerAtHeart3344]

I actually tried that and the program was unresponsive....

[Taamalus]

Aha. Then I've have to pass. I just getting into QT as a game engine. I did not see your second control QPaintEngine. One of the QT team should be able to respond. Or delete this thread, and rephrase the question using only QT controls.
Another potential issue I see is that there is no 'visible statement' in your code snippet you posted, to link to QT's OpenGL support; <QGLWidget> . In other words, QT does not release ownership to Ogre renderer because it may not be able to read it fully.

This is what the world really needs, a debugger that caters to gamers. :)

[ProgrammerAtHeart3344]

well, i asked on the Ogre forum and managed to get an answer, i had to call update() in paintEvent and it worked, the mesh still doesn't rotate smoothly though but it's a start

[Taamalus]

Thanks. I just wrote that down! Yes, ironic, me trying to help and getting answers instead. :D

[ProgrammerAtHeart3344]

well, that's how it is.......there's still a lot of work to do with it and i've found my self creating multiple windows and scene managers for each part, like a mat_mgr for material editing, blah blah

[Guest]

[quote author="Taamalus" date="1289060400"].... I just getting into QT as a game engine. I did not see your second control QPaintEngine. One of the QT team should be able to respond. Or delete this thread, and rephrase the question using only QT controls.
Another potential issue I see is that there is no 'visible statement' in your code snippet you posted, to link to QT's OpenGL support; <QGLWidget> . In other words, QT does not release ownership to Ogre renderer because it may not be able to read it fully.[/quote]

Taamalus, it should be Qt, QT is Quick Time :)

[hugox]

Hi,

My name is hugo and i'm working on a adaptation of ogre3D engine
using qt5 :
http://advancingusability.wordpress.com/2013/03/30/how-to-integrate-ogre3d-into-a-qt5-qml-scene/

I've post similar message in different forums

http://www.ogre3d.org/forums/viewtopic.php?f=2&t=79649&p=499433#p499433

My problem is very similar to yours. I 'm using a special version of QtOgre
and I don't understand how to use or where to put my rendering
loop...Because on this version the autor defined two method called
activateOgrecontext and doneOgreContext which activate already the rendering
process.
But on this particulary point I don't understand how it works! Because there
is no call to Node root->startRendering() or renderingqueue or something
else....

Ogre::Root* OgreEngine::startEngine()
{
m_resources_cfg = "resources.cfg";

activateOgreContext();

Ogre::Root *ogreRoot = new Ogre::Root;
Ogre::RenderSystem *renderSystem = ogreRoot->getRenderSystemByName("OpenGL
Rendering Subsystem");
ogreRoot->setRenderSystem(renderSystem);
ogreRoot->initialise(false);

Ogre::NameValuePairList params;

params["externalGLControl"] = "true";
params["currentGLContext"] = "true";

//Finally create our window.
m_ogreWindow = ogreRoot->createRenderWindow("OgreWindow", 1, 1, false,
&params);
m_ogreWindow->setVisible(false);
m_ogreWindow->update(false);

doneOgreContext();

return ogreRoot;
}

void OgreEngine::activateOgreContext()
{
glPopAttrib();
glPopClientAttrib();

m_qtContext->functions()->glUseProgram(0);
m_qtContext->doneCurrent();

m_ogreContext->makeCurrent(m_quickWindow);
}

void OgreEngine::doneOgreContext()
{
m_ogreContext->functions()->glBindBuffer(GL_ARRAY_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
m_ogreContext->functions()->glBindRenderbuffer(GL_RENDERBUFFER, 0);
m_ogreContext->functions()->glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);

// unbind all possible remaining buffers; just to be on safe side
m_ogreContext->functions()->glBindBuffer(GL_ARRAY_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_COPY_READ_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_COPY_WRITE_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_DRAW_INDIRECT_BUFFER, 0);
// m_ogreContext->functions()->glBindBuffer(GL_DISPATCH_INDIRECT_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
// m_ogreContext->functions()->glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_TEXTURE_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, 0);
m_ogreContext->functions()->glBindBuffer(GL_UNIFORM_BUFFER, 0);

m_ogreContext->doneCurrent();

m_qtContext->makeCurrent(m_quickWindow);
glPushAttrib(GL_ALL_ATTRIB_BITS);
glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
}

when you want to draw something but only in initialisation you do :

void ExampleApp::initialize()
{

// we only want to initialize once
disconnect(this, &ExampleApp::beforeRendering, this,
&ExampleApp::initializeOgre);

// start up Ogre
m_ogreEngine = new OgreEngine(this);
m_root = m_ogreEngine->startEngine();
m_ogreEngine->setupResources();

m_ogreEngine->activateOgreContext();

//draw a small cube
new DebugDrawer(m_sceneManager, 0.5f);
DrawCube(100,100,100);
DebugDrawer::getSingleton().build();

m_ogreEngine->doneOgreContext();
emit(ogreInitialized());

}

after read somme tutorial i've try to loop the rendering process :

void ExampleApp::initialize()
{

// we only want to initialize once
disconnect(this, &ExampleApp::beforeRendering, this,
&ExampleApp::initializeOgre);

// start up Ogre
m_ogreEngine = new OgreEngine(this);
m_root = m_ogreEngine->startEngine();
m_ogreEngine->setupResources();

pRenderWindow=m_ogreEngine->getRenderWindow();

//initialisation we create a first scene and the frame listener
m_ogreEngine->activateOgreContext();
createScene();
createFrameListener();
m_ogreEngine->doneOgreContext();
emit(ogreInitialized());

m_ogreEngine->activateOgreContext();

if(!m_root->renderOneFrame())
std::cout<<"root renderOneFrame"<<std::endl;

// La Boucle de rendu
m_root->startRendering();

//createScene();
while(true)
{
Ogre::WindowEventUtilities::messagePump();

if(pRenderWindow->isClosed())
std::cout<<"pRenderWindow close"<<std::endl;

if(!m_root->renderOneFrame())
std::cout<<"root renderOneFrame"<<std::endl;
}

m_ogreEngine->doneOgreContext();
emit(ogreInitialized());

}

But my app freeze...

Do you have an idea?

[hugox]

sorry for the presentation but I have no choice in type of presentation (texte , code ,....)

:|

[hugox]

Last try!

Hi,

My name is hugo and i’m working on a adaptation of ogre3D engine
using qt5 :
http://advancingusability.wordpress.com/2013/03/30/how-to-integrate-ogre3d-into-a-qt5-qml-scene/

I’ve post similar message in different forums

http://www.ogre3d.org/forums/viewtopic.php?f=2&t=79649&p=499433#p499433

My problem is very similar to yours. I ‘m using a special version of QtOgre
and I don’t understand how to use or where to put my rendering
loop…Because on this version the autor defined two method called
activateOgrecontext and doneOgreContext which activate already the rendering
process.
But on this particulary point I don’t understand how it works! Because there
is no call to Node root->startRendering() or renderingqueue or something
else….
@
Ogre::Root* OgreEngine::startEngine()
{ m_resources_cfg = “resources.cfg”;
activateOgreContext(); Ogre::Root *ogreRoot = new Ogre::Root; Ogre::RenderSystem *renderSystem = ogreRoot->getRenderSystemByName(“OpenGL Rendering Subsystem”); ogreRoot->setRenderSystem(renderSystem); ogreRoot->initialise(false); Ogre::NameValuePairList params; params[“externalGLControl”] = “true”; params[“currentGLContext”] = “true”; //Finally create our window. m_ogreWindow = ogreRoot->createRenderWindow(“OgreWindow”, 1, 1, false, &params); m_ogreWindow->setVisible(false); m_ogreWindow->update(false); doneOgreContext(); return ogreRoot; }
@
@
void OgreEngine::activateOgreContext()
{ glPopAttrib(); glPopClientAttrib();
m_qtContext->functions()->glUseProgram(0); m_qtContext->doneCurrent(); m_ogreContext->makeCurrent(m_quickWindow); }

void OgreEngine::doneOgreContext()
{ m_ogreContext->functions()->glBindBuffer(GL_ARRAY_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); m_ogreContext->functions()->glBindRenderbuffer(GL_RENDERBUFFER, 0); m_ogreContext->functions()->glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
// unbind all possible remaining buffers; just to be on safe side m_ogreContext->functions()->glBindBuffer(GL_ARRAY_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_ATOMIC_COUNTER_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_COPY_READ_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_COPY_WRITE_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_DRAW_INDIRECT_BUFFER, 0); // m_ogreContext->functions()->glBindBuffer(GL_DISPATCH_INDIRECT_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_PIXEL_PACK_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0); // m_ogreContext->functions()->glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_TEXTURE_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, 0); m_ogreContext->functions()->glBindBuffer(GL_UNIFORM_BUFFER, 0); m_ogreContext->doneCurrent(); m_qtContext->makeCurrent(m_quickWindow); glPushAttrib(GL_ALL_ATTRIB_BITS); glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS); }
@
when you want to draw something but only in initialisation you do :
@
void ExampleApp::initialize()
{
// we only want to initialize once disconnect(this, &ExampleApp::beforeRendering, this, &ExampleApp::initializeOgre); // start up Ogre m_ogreEngine = new OgreEngine(this); m_root = m_ogreEngine->startEngine(); m_ogreEngine->setupResources(); m_ogreEngine->activateOgreContext(); //draw a small cube new DebugDrawer(m_sceneManager, 0.5f); DrawCube(100,100,100); DebugDrawer::getSingleton().build(); m_ogreEngine->doneOgreContext(); emit(ogreInitialized());

}
@
after read somme tutorial i’ve try to loop the rendering process :

@
void ExampleApp::initialize() { // we only want to initialize once disconnect(this, &ExampleApp::beforeRendering, this, &ExampleApp::initializeOgre); // start up Ogre m_ogreEngine = new OgreEngine(this); m_root = m_ogreEngine->startEngine(); m_ogreEngine->setupResources(); pRenderWindow=m_ogreEngine->getRenderWindow(); //initialisation we create a first scene and the frame listener m_ogreEngine->activateOgreContext(); createScene(); createFrameListener(); m_ogreEngine->doneOgreContext(); emit(ogreInitialized()); m_ogreEngine->activateOgreContext(); if(!m_root->renderOneFrame()) std::cout<<“root renderOneFrame”<<std::endl; // La Boucle de rendu m_root->startRendering(); //createScene(); while(true) { Ogre::WindowEventUtilities::messagePump(); if(pRenderWindow->isClosed()) std::cout<<“pRenderWindow close”<<std::endl; if(!m_root->renderOneFrame()) std::cout<<“root renderOneFrame”<<std::endl; } m_ogreEngine->doneOgreContext(); emit(ogreInitialized()); }
@

But my app freeze…

Do you have an idea?

[zester]

Your better off not using Qt at all in regards to a 3D Game Engine. I worked on it for years with developers from Irrlicht, Ogre3D, Horde3D, Gameplay3D, OSG, SFML2, .... and have even tried to assist commercial Game Engine developers (Leadwerks) . You will solve one problem with integration and expose ten other issues. The way Qt's abstraction and just in general its designed is bad for games or external 3d graphics engines.

Qt5 makes the problem even worse.

I won't go into it, because core Qt devs never listen and tempers just git heated. But if you want to know what the problems are do a google search.

Without a huge amount of effort re-factoring some of Qt's core components like Autodesk or The Foundry had to do to get things to work out its not going to happen.

Valve, Leadwerks, Gameplay, ... all just used Gtk.

If you have the skills you would be even better off using ...

Poco C++
Boost
Luajit and Luawrapper
SFML2
Bullet

And OpenGL 4.3 or better
http://ogldev.atspace.co.uk/index.html

1. Drawing a pixel
2. Triangle
3. Shaders
4. Uniform Variables
5. Translation Transformation
6. Rotation Transformation
7. Scaling Transformation
8. Interpolation
9. Indexed Draws
10. Concatenating Transformations
11. Perspective Projection
12. Camera Space
13. Camera Control 1
14. Camera Control 2
15. Basic Texture Mapping
16. Ambient Lighting
17. Diffuse Lighting
18. Specular Lighting
19. Point Lighting
20. Spot Lighting
21. Loading Models with Assimp
22. Shadow Mapping - Part 1
23. Shadow Mapping - Part 2
24. Skybox
25. Normal Mapping
26. Billboarding and Geometry Shaders
27. Particle System Using Transform Feedback
28. 3D Picking
29. Basic Tessellation
30. PN Triangle Tessellation
31. Vertex Array Objects
32. Instance Rendering
33. GLFX - OpenGL Effects Library
34. Deferred Shading - Part 1
35. Deferred Shading - Part 2
36. Deferred Shading - Part 3
37. Skeletal Animation with Assimp
38. Silhouette Detection
39. Stencil Shadow Volume
40. Object Motion Blur

http://nopper.tv/norbert/opengl.html

1. Rendering a Triangle
2. Grey Filter
3. Perspective Rendering a Cube
4. Phong rendering of a sphere
5. Texturing a Cube
6. Normal Mapping
7. Enviroment/cube mapping
8. GPU Particles
9. Geometry Shaders
10. Reflection and Refraction
11. Shadow Mapping
12. Simple Tessellation
13. Terrain Rendering
14. Water Rendering
15. Model Loading and Rendering
16. Clipping Planes and two sided Rendering
17. Using Stencil Buffer and Clipping
18. Rendering to texture and planar reflection
19. Texture matrix, alpha blending and discarding
20. Compute Shaders
21. Shadow Volumes
22. Displacement Mapping
23. Erode effect using perlin noise
24. Model with groups and materials
25. Fur rendering
26. Projection shadow for directional lighting
27. Screen Space Ambient Occlusion (SSAO)
28. CPU ray tracing
29. GPU ray tracing using computer shader.

http://antongerdelan.net/opengl/index.html

1. Hello Triangle
2. Extended Initialisation
3. Shaders
4. Vertex Buffers
5. Matrices and Vectors
6. Virtual Camera
7. Quaternion Quick-Start
8. Ray-Based Picking
9. Phong Lighting
10. Texture Maps
11. Importing a Mesh
12. Multi-Texturing
13. Using Textures for Light Coefficients
14. Fragment Rejection
15. Alpha Blending for Transparency
16. Spotlights and Directional Lights
17. Distance Fog
18. Normal Mapping
19. Cube Maps: Sky Boxes and Enviroment Mapping
20. Geometry Shaders
21. Tessellation Shaders
22. Overlay Panels
23. Sprite Sheets and 2D Animation
24. Bitmap Fonts
25. Vertex Displacement Animation
26. Particle Systems
27. Hardware Skinning
28. Morph Target Animation
29. Switching Framebuffer
30. Image Processing with a Kernel
31. Colour-Based Picking
32. Deferred Shading
33. Texture Projection Shadows

http://www.opengl-tutorial.org/

1. Opening a window
2. The first triangle
3. Matrices
4. A Colored Cube
5. A Textured Cube
6. Keyboard and Mouse
7. Model loading
8. Basic shading
9. VBO Indexing
10. Transparency
11. 2D text
12. OpenGL Extensions
13. Normal Mapping
14. Render To Texture
15. Lightmaps
16. Shadow mapping
17. Rotations
18. Billboards & Particles
19. Billboards - Particles / Instancing
20. Picking with an OpenGL hack
21. Picking with a physics library
22. Picking with custom Ray-OBB function