Syphon and Ogre

[tony]

Hi everyone !

Is anybody using syphon in an Ogre3D app ?

 

My app embeds a syphon server. And I have some troubles pushing frames to it.

Using simple client, I can connect to my embeded server, texture resolution and framerate are ok, but texture is garbage.

 

 

Here is how I create server:

 

Ogre::RenderWindow* videoOutput = videoOutputs[VIDEO_OUTPUT_PREVIEW];

Ogre::OSXCocoaWindow* videoOutputCocoa = static_cast<Ogre::OSXCocoaWindow*>(videoOutput);

NSOpenGLContext* mGLContext = videoOutputCocoa->nsopenGLContext();

CGLContextObj ctx = (CGLContextObj)[mGLContext CGLContextObj];

syphonServer = [[SyphonServer alloc]    initWithName:@”video”

context:ctx

options:nil];

 

And how I push frames:

Ogre::TexturePtr texture  = Ogre::TextureManager::getSingleton().getByName(renderPlanes[SOURCE_PREVIEW]->getOutputTexture());;

Ogre::GLTexture* textureGl = static_cast<Ogre::GLTexture*>(texture.get());

GLuint texId;

texId = textureGl->getGLID();

 

CGLLockContext(syphonServer.context);

[syphonServer   publishFrameTexture:texId

textureTarget:GL_TEXTURE_RECTANGLE_EXT

imageRegion:NSMakeRect(0, 0, texture->getWidth(), texture->getHeight())

textureDimensions:NSMakeSize(texture->getWidth(), texture->getHeight())

flipped:NO];

CGLUnlockContext(syphonServer.context);

• This topic was modified 8 years, 2 months ago by tony.

[vade]

Are you sure the texture is gl texture rectangle, not 2D?

[tony]

It seems obvious 🙂

I changed textureTarget to GL_TEXTURE_2D, but same error occurs.

 

Still investigating …

[vade]

Well, a few things.

1) ensure that the CGLContext you init the SyphonServer on is actually the active context used during rendering. Sometimes contexts get destroyed and re-created. Maybe lazy init in the render loop?

2) ensure that the texture you are publishing is not being deleted before you publish.

3) OpenGL Profiler, enable break on error, and ensure there are no GL errors. This is also a great place to go to Resources (when you are stopped at a break point) and verify that your textureID is valid, and matches your expectations.

[tony]

Thanks for your help Vade !

 

I checked with OpenGL profile, texture ID is OK, no GL errors.

Texture is not deleted.

About Context im not so sure. I have multiple render windows, and multiple contexts. I tried each one, same result. I quite sure my problem is here.

[vade]

Is the GL context active, and the same as the one you’ve initted Syphon with? Just check if the CGLCOntextObj returned from CGLGetCurrentContext() matches that you’ve initted Syphon with.

[tony]

I must be missing something in my side

 

Still investigating, I do not want to give up 🙂

 

[Author]

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