Ogre's viewport wont update in real time

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

? This user is from outside of this forum

[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

Drawing a pixel
Triangle
Shaders
Uniform Variables
Translation Transformation
Rotation Transformation
Scaling Transformation
Interpolation
Indexed Draws
Concatenating Transformations
Perspective Projection
Camera Space
Camera Control 1
Camera Control 2
Basic Texture Mapping
Ambient Lighting
Diffuse Lighting
Specular Lighting
Point Lighting
Spot Lighting
Loading Models with Assimp
Shadow Mapping - Part 1
Shadow Mapping - Part 2
Skybox
Normal Mapping
Billboarding and Geometry Shaders
Particle System Using Transform Feedback
3D Picking
Basic Tessellation
PN Triangle Tessellation
Vertex Array Objects
Instance Rendering
GLFX - OpenGL Effects Library
Deferred Shading - Part 1
Deferred Shading - Part 2
Deferred Shading - Part 3
Skeletal Animation with Assimp
Silhouette Detection
Stencil Shadow Volume
Object Motion Blur

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

Rendering a Triangle
Grey Filter
Perspective Rendering a Cube
Phong rendering of a sphere
Texturing a Cube
Normal Mapping
Enviroment/cube mapping
GPU Particles
Geometry Shaders
Reflection and Refraction
Shadow Mapping
Simple Tessellation
Terrain Rendering
Water Rendering
Model Loading and Rendering
Clipping Planes and two sided Rendering
Using Stencil Buffer and Clipping
Rendering to texture and planar reflection
Texture matrix, alpha blending and discarding
Compute Shaders
Shadow Volumes
Displacement Mapping
Erode effect using perlin noise
Model with groups and materials
Fur rendering
Projection shadow for directional lighting
Screen Space Ambient Occlusion (SSAO)
CPU ray tracing
GPU ray tracing using computer shader.

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

Hello Triangle
Extended Initialisation
Shaders
Vertex Buffers
Matrices and Vectors
Virtual Camera
Quaternion Quick-Start
Ray-Based Picking
Phong Lighting
Texture Maps
Importing a Mesh
Multi-Texturing
Using Textures for Light Coefficients
Fragment Rejection
Alpha Blending for Transparency
Spotlights and Directional Lights
Distance Fog
Normal Mapping
Cube Maps: Sky Boxes and Enviroment Mapping
Geometry Shaders
Tessellation Shaders
Overlay Panels
Sprite Sheets and 2D Animation
Bitmap Fonts
Vertex Displacement Animation
Particle Systems
Hardware Skinning
Morph Target Animation
Switching Framebuffer
Image Processing with a Kernel
Colour-Based Picking
Deferred Shading
Texture Projection Shadows

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

Opening a window
The first triangle
Matrices
A Colored Cube
A Textured Cube
Keyboard and Mouse
Model loading
Basic shading
VBO Indexing
Transparency
2D text
OpenGL Extensions
Normal Mapping
Render To Texture
Lightmaps
Shadow mapping
Rotations
Billboards & Particles
Billboards - Particles / Instancing
Picking with an OpenGL hack
Picking with a physics library
Picking with custom Ray-OBB function