OpenGL 4.5 For The Intel Mesa Driver May Be Imminent

[DMJC]

GL 4.5 is finished on the Nouveau driver, aside from the KHR Robustness support. Then just waiting on 2 GL 4.4 extensions for full activation!

[andrei_me]

3 months? People have been working on 4.3+ stuff for more than a year.

When the commit timestamp don't tell the whole true :P

[Ancurio]

opengl 4.3 guaranteed 4.4-5 possible

very good for 3 months of development

3 months? People have been working on 4.3+ stuff for more than a year.

[danvet]

Big problem with hsw is the 64bit float stuff. Intel hardware doesn't have all the fp64 ops in hardware, and they need to be emulated in software. That support is done for SIMD8/16/32 modes afaik. But vertex shaders on Haswell run in SIMD4x2 mode, and that's a bit different. Hence no gl4.0 yet (but Igalia is working on fp64 in SIMD4x2 mode).
Compute is perfectly fine on HSW afaik.

On bdw+ otoh compute is a problem since there's not enough space for the minimum number of threads (limits moved around a bit) in SIMD16 mode like on haswell, hence why SIMD32 is required on bdw for compute.

Summary: The intel mesa driver has all the extensions needed, the problem is just getting all the extensions enabled on 1 platform together. Since SIMD32 seems close to merging (at least for compute shaders) it's looking really good.

[W.Irrkopf]

I would like to see OpenGL performance benchmark between Haswell, Broadwell, and Skylake.
I wonder how good Kaby Lake will be when it comes...

Haswell (gen 7.5) will probably not make 4.0 (and up) for the upcoming release, although it looks like the missing pieces are being worked on.
4.0: GL_ARB_gpu_shader_fp64 --- DONE (i965/gen8+, llvmpipe, softpipe)
4.1: GL_ARB_vertex_attrib_64bit --- DONE (i965/gen8+, llvmpipe, softpipe)
4.2: GL_ARB_stencil_texturing --- DONE (i965/gen8+, nv50, nvc0, r600, radeonsi, llvmpipe, softpipe, swr)
4.4: GL_ARB_texture_stencil8 --- DONE (i965/gen8+, nv50, nvc0, r600, radeonsi, llvmpipe, softpipe, swr)
Also I'm not sure how useable the CS code is on Haswell.

[uid313]

I would like to see OpenGL performance benchmark between Haswell, Broadwell, and Skylake.
I wonder how good Kaby Lake will be when it comes...

[davidbepo]

opengl 4.3 guaranteed 4.4-5 possible

very good for 3 months of development

[phoronix]

Phoronix: OpenGL 4.5 For The Intel Mesa Driver May Be Imminent

Intel has been rapidly advancing their OpenGL 4.x support and OpenGL 4.5 is even in sight now...

http://www.phoronix.com/scan.php?page=news_item&px=Mesa-Intel-GL45-Robustness