Graphics buffer access mode

• none - No buffer access
• read - Read access to buffer
• write - Write aces to buffer
• cow - Forces copy-on-write if already mapped as read-only. Requires write.

enum Efl.Gfx.Buffer_Access_Mode {
    none: 0,
    read: 1,
    write: 2,
    cow: 4
}

typedef enum {
    EFL_GFX_BUFFER_ACCESS_MODE_NONE = 0,
    EFL_GFX_BUFFER_ACCESS_MODE_READ = 1,
    EFL_GFX_BUFFER_ACCESS_MODE_WRITE = 2,
    EFL_GFX_BUFFER_ACCESS_MODE_COW = 4
} Efl_Gfx_Buffer_Access_Mode;