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Thread: OpenVG - Implmentaion details..

  1. #1
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    OpenVG - Implmentaion details..

    Hello All,

    I need some help from you guys.
    From my understanding openvg is now only implemented by these makers

    1 Hybrid Graphics : http://www.hybrid.fi/main/extra/openvg_ri.php
    2 Amanith ( it is a commercial version)
    3 khronos ( a reference implementaion).

    Are anytoher comapny implmeneted openVg ?

    From my understanding now openvg uses opengl or openglES or qtopengl for implementation. Can we expect a dedicated hardware chip for openVg in future ? ( like opengl has) otherwise openvg can't make much perfomance gain than opengl . right ?

    Please tell your opinions..

  2. #2
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    There are at least 8 companies offering (or planning to offer) OpenVG implementations:
    AMD, ARM, DMP, Huone, Imagination Technologies, Mazatech, Nvidia (Hybrid Graphics), Scaleform

    There are different levels of acceleration among those implementations:
    - software rendering
    - layered on top of OpenGL/OpenGL ES
    - using 3D hardware directly
    - using dedicated VG hardware
    Each level offers different trade-offs.

    The Khronos RI is the one provided by Nvidia/Hybrid Graphics.
    Georg Kolling, Imagination Technologies
    Please ask questions specific to PowerVR hardware or SDKs on the PowerVR Insider Forum
    DevTech@imgtec.com | http://www.powervrinsider.com

  3. #3
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    Thanks Xmas for the reply.

    I have one more question , please see it .
    As we know there are many implementations . But in the the openVg specification says it is for Hardware accelrated vector graphics . So if someone implements it in software , there is no meaning right ?

    Also i want know whether use the opengl implementaion will make some perfomance loss , rather than creating a new implementation directly for openvg.

    What is your idea ?

  4. #4
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    Quote Originally Posted by kdworld
    Thanks Xmas for the reply.

    I have one more question , please see it .
    As we know there are many implementations . But in the the openVg specification says it is for Hardware accelrated vector graphics . So if someone implements it in software , there is no meaning right ?
    OpenVG specifies a standard way for applications to access vector graphics functionality. This allows hardware acceleration, and it makes the lives of application developers easier. But even if you don't use hardware acceleration, you still have the latter.

    Also i want know whether use the opengl implementaion will make some perfomance loss , rather than creating a new implementation directly for openvg.
    Dedicated VG hardware may be more efficient than software rendering or 3D hardware doing the same task. That doesn't imply it's faster. "Hardware acceleration" can range from ultra low power SoC components to high end PC multi-GPU solutions.
    Georg Kolling, Imagination Technologies
    Please ask questions specific to PowerVR hardware or SDKs on the PowerVR Insider Forum
    DevTech@imgtec.com | http://www.powervrinsider.com

  5. #5
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    Thanks the information. I will keep it in mind.

  6. #6
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    Re: OpenVG - Implmentaion details..

    Quote Originally Posted by kdworld
    Hello All,

    I need some help from you guys.
    From my understanding openvg is now only implemented by these makers

    1 Hybrid Graphics : http://www.hybrid.fi/main/extra/openvg_ri.php
    2 Amanith ( it is a commercial version)
    3 khronos ( a reference implementaion).

    Are anytoher comapny implmeneted openVg ?

    From my understanding now openvg uses opengl or openglES or qtopengl for implementation. Can we expect a dedicated hardware chip for openVg in future ? ( like opengl has) otherwise openvg can't make much perfomance gain than opengl . right ?

    Please tell your opinions..
    Yeah, you're missing a couple.

    The best of the commonly avaiable is the example from Hybrid's Rasteroid releases (http://www.hybrid.fi/main/download/tools.php). Simply download Rasteroid3 and use the EGL/VG/GLES dlls, libs and header files from that. It's much faster than the reference implementation (hundreds of times faster), and almost as accurate (some minor problems with linear gradients, and a few other things).

    There is also AlexVG by HuOne (www.alexvg.com). They have an implementation, but their EGL is a bit off spec, and heavy use of their VG api will eventually cause problems too.

    AmanithVG which you mentioned (http://www.amanithvg.com/) is fastest, but requires hardware support, and even then things like Radial Gradients is a bit off (on my computer at least).

    Of the publically available OpenVG implementations though, I recommend Rasteroid.

  7. #7

    Re: OpenVG - Implmentaion details..

    Quote Originally Posted by Ivo Moravec
    ...

    AmanithVG which you mentioned (http://www.amanithvg.com/) is fastest, but requires hardware support, and even then things like Radial Gradients is a bit off (on my computer at least).

    ...
    Hi Ivo, just to let you know, we have fixed radial gradients problems for Intel accelerators under Windows. If you want to test new builds you can contact me privately.
    Unfortunately we don't have so much time to update the site and download sections; anyway as soon as possible we'll upload new AmanithVG builds, as well the new software rendering engine.
    AmanithVG Lead Programmer

  8. #8
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    Re: OpenVG - Implmentaion details..

    Quote Originally Posted by muratmat
    Hi Ivo, just to let you know, we have fixed radial gradients problems for Intel accelerators under Windows. If you want to test new builds you can contact me privately.
    Unfortunately we don't have so much time to update the site and download sections; anyway as soon as possible we'll upload new AmanithVG builds, as well the new software rendering engine.
    That's good to hear.

    Since I made that bug report though I broke down and bought a video card (GeForce 7100 GS) so I could run it. This fixed weird artifacts I mentioned in the bug report, but I get a different issue now. When I rotate (or transform in general - with the PATH_TO_SURFACE transform) some geometry (any geometry - let's say a square block) with a radial gradient on it, I find the gradient starts swimming on me (the gradient moving in relation to the square). This should only be possible to do changing the paint matrix, but that matrix is still set to the identity the whole time.

  9. #9
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    Hi Ivo,

    Thanks for your reply.

    AmanithVG which you mentioned (http://www.amanithvg.com/) is fastest, but requires hardware support, and even then things like Radial Gradients is a bit off (on my computer at least).
    Do you know which Hardware(chipset) they are using ?
    If amanithvg uses opengl , i know now many graphics cards supports opengl. Otherwise what is the required graphic cards ?

    thanks,

  10. #10
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    At the moment, AmanithVG is an OpenGL (and GLES) based OpenVG 1.0 implementation. It's EGL-less, so, in order to have access to OpenVG functions, the user must open a valid GL context (using OS specific calls, or 3rd parts libraries like GLUT, or EGL, or ...) then call a proprietary function to initialize the VG context.

    There are little limitations (eg: based on the number of available texture units). Please refer to this page for the complete list.
    Anyway, the graphic board model doesn't matter, the important thing is to have working OpenGL (GLES) drivers installed.

    Ivo: When you have the time, can you send me a little VG code snippet with your swimming radial gradient ? so i can check if the problem has been already fixed in the current AmanithVG version... mfabbri@mazat... (complete it)
    Michele Fabbri - Mazatech Srl

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