inline fun GpuBufferSlice.copyFrom(source: GpuBufferSlice)
inline fun GpuTexture.copyFrom(source: GpuTexture, mipLevel: Int = 0, intoX: Int = 0, intoY: Int = 0, sourceX: Int = 0, sourceY: Int = 0, width: Int = source.getWidth(mipLevel), height: Int = source.getHeight(mipLevel))