Most important : "[...] it looks like the most notable change is the addition of "Tessellation Control Processor" and "Tessellation Evaluation Processor"."
aand
"Most of the improvements in GL 4.0 are incremental. Apart from the obvious inclusion of tessellation support (which is perhaps the most important DX 11 feature), it includes:
No, the people who were disappointed by GL3 mostly wanted the early ideas of an object model to replace the bind-and-set model that OpenGL has been using. GL3 did introduce some extensions for direct state access (DSA), which is a decent compromise, but it wasn't in the core spec. It's still not in the core GL4 spec, but on the message boards it's starting to sound like GL5 may have DSA in the core. GL4 does add a ton of good new functionality, but not the huge change to the programming model that DSA will offer.
Most important : "[...] it looks like the most notable change is the addition of "Tessellation Control Processor" and "Tessellation Evaluation Processor"."
aand
"Most of the improvements in GL 4.0 are incremental. Apart from the obvious inclusion of tessellation support (which is perhaps the most important DX 11 feature), it includes:
- Transform Feedback Objects
- Sampler Objects
- Cube Map Texture Arrays
- Block Sampling (textureGather)
- Multisample support in fragment shaders"