Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Texture Mode
PREF_OPENGL_TEXTUREMODEParameter: Anti-Aliasing
PREF_OPENGL_ANTIALIASParameter: UV Editor Anti-Aliasing
PREF_OPENGL_UVEDITOR_ANTIALIASParameter: Maximum Transparency
PREF_OPENGL_MAXTRANSParameter: Maximum Lights
PREF_OPENGL_MAXLIGHTParameter: Maximum Shadows
PREF_OPENGL_MAXSHADParameter: Use Shader Cache
PREF_OPENGL_USE_SHADER_CACHEParameter: Enable Dithering in Viewport
PREF_OPENGL_VIEWPORT_DITHERINGParameter: Load Previous Settings
PREF_OPENGL_LOAD_PREVIOUSParameter: Save Current Settings as Startup
PREF_OPENGL_SAVE_AS_STARTUPParameter: PREF_OPENGL_WARNING
PREF_OPENGL_WARNING