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ATI Radeon R600 Mesa Classic Driver Can Do OpenGL 2.1

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  • #16
    Originally posted by pedepy View Post
    which i suppose i better, except for the fact that everything tends to freeze and die sooner or later.
    What does "sooner or later" mean in this case? Haver you filed a bug?

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    • #17
      Originally posted by pedepy View Post
      maybe you can clear my confusion[...]?
      Well... If you are not using the proprietary driver then there are two FLOSS driver options.

      The way that OpenGL works under Linux is Mesa. Mesa is an OpenGL implementation but officialy it is not due to legal concerns. But still think of Mesa as OpenGL.

      Inside of Mesa there are drivers so when an application(/game) talks to OpenGL, it actualy talks to Mesa and mesa then talks to your graphics card.

      So the version of OpenGL Mesa supports is the highest version you will get to enjoy, if the driver for your graphics card supports it, ofcourse. The current version of Mesa supports the OpenGL 2.1 API.

      There are actually two drivers at the moment. The Radeon classic driver and the Radeon Gallium driver. Gallium is this new and flashy driver architecture that is going to rule the world, but for now most people use the classic drivers because they are more solid or feature complete.

      Apperantly the classic driver that drives your card is only supporting up to 1.5.
      The Gallium driver that you also ran tells you it is OpenGL 2.1 compatible, but crashes. So why is that?

      Well put realy simple: instead of writing drivers to expose an OpenGL or OpenGL ES or OpenCL API; Gallium drivers are our there to support only the Gallium API. So what happens to your OpenGL?

      Stuff like OpenGL, OpenVG, OpenCL, DirectX and whatever is written on top of the Gallium API. So when your graphics driver exposes a Gallium API it automaticaly is compatible with all those other API's. Cool, huh? Same goes for nVidia and Intel.

      So what happens here is that your Gallium driver doesn't fully work, but the OpenGL 2.1 'State Tracker' does, so your graphics card exposes OpenGL 2.1, while in fact it doesn't realy do that, or partialy or buggy.

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      • #18
        OpenGL version string: 2.1 Mesa 7.9-devel
        There you go! OpenGL 2.1

        which i suppose i better, except for the fact that everything tends to freeze and die sooner or later.
        So file a bug, instead of going on about OpenGL 1.5 and how r600 supports OpenGL 3.3 and whatnot.

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        • #19
          ehh, okay, but pretty much all of the info i can find seems to say my chip supports up to 2.0, not 2.1 ... perhaps this is the cause of my troubles with the gallium driver?

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          • #20
            The extensions you are missing will be performed in software, the rest (up to OpenGL 2.0) will be fully accelerated. At least the driver can run OpenGL 2.1 software, even if not all of it will be perfectly fast.

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            • #21
              Originally posted by pingufunkybeat View Post
              The extensions you are missing will be performed in software, the rest (up to OpenGL 2.0) will be fully accelerated. At least the driver can run OpenGL 2.1 software, even if not all of it will be perfectly fast.
              Which, by the way, is exactly what catalyst does for your GPU on Windows and what it does on linux in versions that support those GPUs.

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