GL_EXT_compiled_vertex_array https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_compiled_vertex_array.txt GL_EXT_compiled_vertex_array GL_ARRAY_ELEMENT_LOCK_FIRST_EXT 0x81A8 GL_ARRAY_ELEMENT_LOCK_COUNT_EXT 0x81A9 void glLockArraysEXT (GLint first, GLsizei count) void glUnlockArraysEXT (void)