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| Raw OpenGL with Horde3D http://horde3d.org/forums/viewtopic.php?f=1&t=978 |
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| Author: | Orm [ 13.10.2009, 03:31 ] |
| Post subject: | Raw OpenGL with Horde3D |
Possible? |
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| Author: | DarkAngel [ 13.10.2009, 03:45 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
Yep. Some other members have posted on here saying they've used it to draw their own debug geometry, or have used OpenGL GUI libraries successfully with Horde. |
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| Author: | Orm [ 13.10.2009, 03:48 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
You have me intrigued with said GUI libraries. Please, do tell as I was searching for that very thing. o.0 And I would assume that after calling hordes init function i can begin to call OpenGL functions like normal right? |
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| Author: | DarkAngel [ 13.10.2009, 04:54 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
I haven't done this myself in any of the newer versions of Horde, but I think you can add your own GL calls in your main loop AFTER the call to h3dFinalizeFrame. Something like: Code: init while(!exit) { render finalize custom GL Stuff swapBuffers } release Here is another thread where people are discussing different GUI libraries to use with Horde: http://www.horde3d.org/forums/viewtopic.php?f=2&t=169 |
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| Author: | Orm [ 13.10.2009, 05:00 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
Thank you. |
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| Author: | Orm [ 13.10.2009, 18:13 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
I guess I should ask if there any examples of people using raw OpenGL with H3D. I have a project due at the end of the semester and I was hoping... nah forget it. I'll use raw OpenGL with GLFW and worry about Horde when I can. |
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| Author: | Volker [ 13.10.2009, 19:42 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
I use raw OpenGL in the editor. All you have to do is calling your OpenGL instructions AFTER calling h3dFinalizeFrame. And if you going to change OpenGL states, it might be a good idea to save some OpenGL attributes using Code: glPushAttrib(GL_COLOR_BUFFER_BIT | GL_CURRENT_BIT | GL_DEPTH_BUFFER_BIT | GL_ENABLE_BIT | GL_HINT_BIT | GL_LIGHTING_BIT); and restore them after your GL calls with Code: glPopAttrib()
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| Author: | zoombapup [ 17.10.2009, 11:05 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
Yeah, I draw my UI and debug geometry with raw GL calls. Most of the libs I use are happy with simple line/tri drawing functions for debug so it just works. |
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| Author: | Orm [ 24.10.2009, 01:50 ] |
| Post subject: | oops i double posted |
<snippity doo dah> |
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| Author: | Orm [ 24.10.2009, 01:53 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
Alright, so what about swapping buffers after doing all the drawing? Is that handled by Horde? This is nice because I am working on a 2D engine to start and will be migrating to 3D after the semester is over while further expanding on it. I guess I won't have to scrap my 2D drawing classes after all.  It's my math classes that are going to be a pain. 
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| Author: | swiftcoder [ 24.10.2009, 01:55 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
Orm wrote: Alright, so what about swapping buffers after doing all the drawing? Is that handled by Horde? Take a look at the samples - that sort of thing is always handled by the client application. Horde doesn't take over your runloop.
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| Author: | Orm [ 24.10.2009, 05:41 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
swiftcoder wrote: Horde doesn't take over your runloop. Excellent. That answers pretty much every single question I could ever have about this engine.  If I may make a suggestion, you may want to explicitly state that in the documentation. If I missed such a statement, please let me know, but I'm pretty sure it's not said there. |
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| Author: | Mirytabel [ 16.11.2009, 13:19 ] | |||
| Post subject: | Re: Raw OpenGL with Horde3D | |||
I tried to insert this code: // Finish rendering of frame h3dFinalizeFrame(); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glPushMatrix(); glTranslatef(0.5,0.5,-0.2); glutSolidSphere(0.2,50,50); glPopMatrix(); glFlush(); // Remove all overlays h3dClearOverlays(); I can see a sphere, but it seems to "follow the camera": even if I move the camera position, the sphere remains in the same area of the screen. I'd like to place it on the grass plane, is it possible?
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| Author: | Volker [ 16.11.2009, 13:30 ] |
| Post subject: | Re: Raw OpenGL with Horde3D |
Have a look at the GLWidget of the Editor: in the renderEditorInfo method you can find Code: const float* camera = 0; // Retrieve camera position... h3dGetNodeTransMats(m_activeCameraID, 0, &camera); // In case of an invalid camera (e.g. pipeline not set) return if ( !camera ) return; // ... and projection matrix float projMat[16]; h3dGetCameraProjMat( m_activeCameraID, projMat ); // ... // Set projection matrix glMatrixMode( GL_PROJECTION ); glLoadMatrixf( projMat ); // apply camera transformation glMatrixMode( GL_MODELVIEW ); QMatrix4f transMat( camera ); glLoadMatrixf( transMat.inverted().x ); // then later in e.g. drawGizmo glPushMatrix(); glMultMatrixf(nodeTransform); // Load scene node matrix // ... draw code glPopMatrix(); |
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