From SIGGRAPH 2008, one of the premiere computers graphics conferences, the Khronos Group has announced the release of the OpenGL 3.0 API specification and the GLSL 1.30 shading language specification. This is the first major update to this cross-platform 3D programming API since the OpenGL 2.1 release two years ago. In this article we have a bit of information on these OpenGL and GLSL updates and when we can expect to see the Linux graphics scene moving to this new standard.
Will it be possible to create videos-games with very realistic graphics like directx10 videos-games with this new OpenGL?
In fact, many games that offer both DX9 and DX10 versions don't differ _that_ much in graphics quality, so it's actually possible to do the same "very realistic graphics" of DX10 and DX9. And as most (if not all) DX9 features are also implemented in Opengl 2.x, it's even possible to do these kinds of graphics in "old" Opengl versions.
What OpenGL 3 improves here, however, is the general API look and also it optimizes a few basic concepts as well as introducing a better shader language.
I.e. both DX10 and OGL3 don't make these graphics possible, but make it easier for games to achieve them.