Get Ready for WebGL 2.0!

[yvt]

Here are some of the new features of WebGL 2.0:

• Muliple Render Targets: The current implementation of geometry pass doesn't use MRT. By using MRT, ALU load can be reduced by 1/4.
• Vertex Array Objects: Reduction of draw calls.
• Instancing: Reduction of draw calls.
• Uniform Buffer Objects: Reduction of draw calls.
• 3D Texture: Might be useful for some global illumination methods as well as volumetrics.
• gl_FragDepth: Depth buffer can be downsampled.
• Query Objects: Occlusion culling.
• Sync Objects: Accurate profiling.

We could take advantage of these features by using WebGL 2.0, but we need to take these things into consideration:

• GLSL of WebGL 2.0 differs from that of WebGL 1.0 slightly
• WebGL API itself didn't change too much, so we can and should avoid duplicated code

[yvt]

Hyper3D core for WebGL 2.0 is being written in C++.