To sum it up here : Most important : "[...] it looks like the most notable change is the addition of "Tessellation Control Processor" and "Tessellation Evaluat

To sum it up here : 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"