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Developers Are Still Working On OpenGL 4.x For Intel Haswell / Ivy Bridge

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  • #11
    I'm starting to think that all the vendors should get together and stage a very polite mutiny w.r.t. FP64 in OpenGL. I haven't heard of a single app that actually uses it yet, but it's blocking GL 4.x enablement for a lot of hardware and the work required to emulate it in the shader compiler is non-trivial.

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    • #12
      Originally posted by Kano View Post
      But for games you can forget it, Haswell and Dota 2 no way. Talos no way - completely useless these days. Maybe Intel can run the minimal Vulkan compliance suite but no real games.
      Vulkan on Intel Ivy Bridge can sure run real games (Well, since a couple of hours ago https://cgit.freedesktop.org/mesa/me...f4b735aace677b)!

      Here, running The Talos Principle on Ivy Bridge:
      https://www.youtube.com/watch?v=i7Sw1dyw2_w

      You didn't say it needs to run them correctly, did you?

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      • #13
        It was possible with hangs and later crash that way weeks ago, but that's nonsense.

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        • #14
          Originally posted by bridgman View Post
          I'm starting to think that all the vendors should get together and stage a very polite mutiny w.r.t. FP64 in OpenGL. I haven't heard of a single app that actually uses it yet, but it's blocking GL 4.x enablement for a lot of hardware and the work required to emulate it in the shader compiler is non-trivial.
          Is it still, though? Intel is basically done, ARM gpu's aren't interested, and i think nvidia was always ok.

          That just leaves r600 left.

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          • #15
            Originally posted by smitty3268 View Post

            Is it still, though? Intel is basically done, ARM gpu's aren't interested, and i think nvidia was always ok.

            That just leaves r600 left.
            https://en.wikipedia.org/wiki/List_o...HD_7xxx_Series

            There are a lot of GCN cards that don't have it either. Look at the double precision column.

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            • #16
              Originally posted by bridgman View Post
              I'm starting to think that all the vendors should get together and stage a very polite mutiny w.r.t. FP64 in OpenGL. I haven't heard of a single app that actually uses it yet, but it's blocking GL 4.x enablement for a lot of hardware and the work required to emulate it in the shader compiler is non-trivial.
              Well, I still think an implementation would be a good idea, but I do think your right that it isn't really necessary. IMO AMD could ignore fp64 and expose the appropriate GL support anyway and it would almost certainly be perfectly fine.

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              • #17
                Here's a question: *Why* isn't fp64 used anywhere? The functionality it provides simply not that useful? Some specific gotcha in the design of the extension making it really difficult to actually use it in practice? What?

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                • #18
                  fp64 is really only useful for compute; it's referred to as "double-precision" floating point in most specs because there isn't a need for more than 32-bit floating point calculations in 3D graphics, period.

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                  • #19
                    Originally posted by duby229 View Post

                    https://en.wikipedia.org/wiki/List_o...HD_7xxx_Series

                    There are a lot of GCN cards that don't have it either. Look at the double precision column.
                    I didn't see any GCN cards that don't support DP. All the ones that had N/A were Terascale. Did I miss something?

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                    • #20
                      There are, however, a few OpenGL 4.x-requiring games that run fine on Ivy and Haswell hardware -- Divinity Original Sin's Enhanced Edition (the one that got a native Linux release) comes to mind, except that of course has a bug that prevents it from working on Mesa at all.

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