Release sponsors

This release was made possible via generous financial contributions from:

Significant changes relative to 3.0 beta1:

1. Worked around an issue with Red Hat Enterprise Linux 8 and work-alike operating systems whereby, if X11 forwarding was enabled by default in the SSH client, vglconnect -s would hang while making a preliminary SSH connection to find a free port on a server running one of those operating systems.

2. Fixed an issue in the EGL back end whereby glReadPixels() did not work with multisampled drawables.

3. Fixed an issue in the EGL back end whereby the glGet*() functions sometimes returned an incorrect value for GL_DRAW_BUFFER0 through GL_DRAW_BUFFER15 if the correct value was GL_NONE.

4. The VirtualGL Faker now interposes the glXGetCurrentDisplayEXT() function, which is part of the GLX_EXT_import_context extension. (The GLX_EXT_import_context extension can be used with the GLX back end if the underlying OpenGL library and 3D X server support the extension and if indirect OpenGL contexts are enabled using VGL_ALLOWINDIRECT.)

5. Fixed an issue in the EGL back end whereby the glXChooseFBConfig() function returned no FB configs if the GLX_DRAWABLE_TYPE attribute was set to GLX_DONT_CARE.

6. Fixed an issue in the EGL back end whereby the glXSwapBuffers() function erroneously swapped the buffers of double-buffered Pixmaps.

7. Fixed an issue in the EGL back end that caused the bounding box in 3D Slicer to be displayed on top of the rendered volume when "Display ROI" and depth peeling were both enabled.

8. The EGL back end now supports OpenGL applications that simultaneously make the same GLX drawable current in more than one thread. As a consequence, the EGL back end now requires the EGL_KHR_no_config_context and EGL_KHR_surfaceless_context extensions.