Hello Ian, On Mon, Nov 26, 2018 at 2:04 PM Ian Campbell <i...@debian.org> wrote: > > On Mon, 2018-11-26 at 12:07 +0100, bret curtis wrote: > > The hardware that supports GLES also supports OpenGL because GLES is > > a subset of OpenGL. > > I'm confused by this inference. If GLES is a subset of OpenGL then > surely hardware which claims to implement GLES is at liberty to only > implement that subset and would therefore not necessarily support > OpenGL. > > Ian. >
I believe this is a purely a driver/firmware distinction. So whoever implements this is at liberty to do whatever they want so long as the hardware supports it. Meaning that if something advertises GLESv2 support then it has, at least, OpenGL 2.0 support in hardware because without that, they couldn't have supported GLESv1. GLES1.1 is fixed-function pipeline that is compatible with OpenGL 2.0, you're not going to create hardware to support GLES1.1 that doesn't also support at least OpenGL 2.0 GLESv2 is another beast, it dropped fixed-function pipeline because that was the spec, but it is still a software implementation and doesn't mean that it no longer exists in hardware. Take for example the Nvidia Tegra: https://opengles.gpuinfo.org/displayreport.php?id=690 <-- SHIELD Android TV which happens to be a Tegra SoC supports OpenGL ES 3.2 https://opengl.gpuinfo.org/displayreport.php?id=2377 <-- Tegra as integrated with CPU (nvgpu), supports OpenGL 4.6.0 Similar (if not the same?) hardware, running aarch64, the only real difference is the driver. That being said, I would love to hear from someone who actually makes these things to comment. It is entirely possible that there is a chip out there that supports GLES 3.2 and only that in hardware. I would be amazed but I'm reluctant to ever use the words never and ever. So far, the hardware that supports that are[1]: Adreno 420 and newer AMD GCN-architecture Intel HD Graphics Skylake and higher Mali-T760 and newer Nvidia GeForce 400 series (Fermi) As I said, I would be amazed if these GPUs didn't support some minimal version OpenGL in hardware. As I said elsewhere, most free and open-source drivers (mesa) support both some version of GLES along with some version of GL. [2] Cheers, Bret [1] https://en.wikipedia.org/wiki/OpenGL_ES#OpenGL_ES_3.2_2 [2] https://mesamatrix.net/
