glbuffer: support persistent buffer mappings
Requires OpenGL 4.4 or EXT/ARB_buffer_storage
Improves throughput of uploads by roughly 30%-60% and download throughput by roughly 10-30% across depending on the exact scenario and hardware.
Requires OpenGL 4.4 or EXT/ARB_buffer_storage
Improves throughput of uploads by roughly 30%-60% and download throughput by roughly 10-30% across depending on the exact scenario and hardware.