OpenGL2: r_ext_multisample > 0 breaks r_drawSunRays 1 (without HDR or FB-MSAA)

[zturtleman]

r_drawSunRays 1 works with r_ext_framebuffer_multisample > 0 but not r_ext_multisample > 0 (multisample on default framebuffer). I guess it's not valid to read part of the multisample default framebuffer?

In OpenGL2, HUD models are drawn to the default framebuffer directly and are affected by r_ext_multisample and not r_ext_framebuffer_multisample. So r_ext_multisample is still valid to use but it also breaks r_drawSunRays 1. I'm not sure the best way to make both of these work at the moment.

[zturtleman]

As of f9547e4, r_ext_multisample > 0 only breaks r_drawSunRays 1 if not using r_hdr 1 (the default) and not using r_ext_framebuffer_multisample > 0.