Variable GPUBufferUsage

GPUBufferUsage: {
    COPY_DST: GPUFlagsConstant;
    COPY_SRC: GPUFlagsConstant;
    INDEX: GPUFlagsConstant;
    INDIRECT: GPUFlagsConstant;
    MAP_READ: GPUFlagsConstant;
    MAP_WRITE: GPUFlagsConstant;
    QUERY_RESOLVE: GPUFlagsConstant;
    STORAGE: GPUFlagsConstant;
    UNIFORM: GPUFlagsConstant;
    VERTEX: GPUFlagsConstant;
}