GLX Interface

Interface functions exist to provide access to various esoteria of the OpenGL Windowing Extension to X Window (GLX).

The OpenGL notion of a context is encapsulated in a higher order construct, tvGLXContext. A suitable context for TerraVision may be found by calling tvGLX_FindContext(), which returns a tvGLXContext structure. From this, the OpenGL context can be retrieved by calling tvGLX_GetContext().

Additional functions support setting and retrieving values in the tvGLXContext structure. tvGLX_SetTextureCache() sets the texture cache, while tvGLX_GetTextureCache() returns it. Likewise, tvGLX_SetRenderPrimitiveCache() sets the RenderPrimitiveCache, and tvGLX_GetRenderPrimitiveCache() retrieves it.
(ISSUE: need discussion here on what these things are and how they in turn are created).

Other function pairs are tvGLX_UseSharing()/ tvGLX_Sharing() for controlling the state of cache sharing (ISSUE: huh?), tvGLX_UseDoubleBuffer()/ tvGLX_DoubleBuffer() for setting OpenGL's double-buffering state, and tvGLX_UseStereo()/ tvGLX_Stereo() for controlling whether stereo views are to be generated.

The list of extensions supported by the local GLX implementation may be queried by calling tvGLX_GetGLXExtensions().

API