cudnn 0.1.3

safe wrapper around CUDA's cuDNN
Documentation 
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//! Defines a Filter Descriptor.
//!
//! A Filter Descriptor is used to hold information about the Filter,
//! which is needed for forward and backward convolutional operations.

use super::{API, Error};
use ffi::*;

#[derive(Debug, Clone)]
/// Describes a Filter Descriptor.
pub struct FilterDescriptor {
    id: isize,
}

impl Drop for FilterDescriptor {
    #[allow(unused_must_use)]
    fn drop(&mut self) {
        API::destroy_filter_descriptor(self.id_c());
    }
}

impl FilterDescriptor {
    /// Initializes a new CUDA cuDNN FilterDescriptor.
    pub fn new(filter_dim: &[i32], data_type: DataType) -> Result<FilterDescriptor, Error> {
        let nb_dims = filter_dim.len() as i32;

        let generic_filter_desc = try!(API::create_filter_descriptor());
        match data_type {
            DataType::Float => {
                let d_type = cudnnDataType_t::CUDNN_DATA_FLOAT;
                try!(API::set_filter_descriptor(generic_filter_desc, d_type, nb_dims, filter_dim.as_ptr()));
                Ok(FilterDescriptor::from_c(generic_filter_desc))
            },
            DataType::Double => {
                let d_type = cudnnDataType_t::CUDNN_DATA_DOUBLE;
                try!(API::set_filter_descriptor(generic_filter_desc, d_type, nb_dims, filter_dim.as_ptr()));
                Ok(FilterDescriptor::from_c(generic_filter_desc))
            },
            DataType::Half => {
                let d_type = cudnnDataType_t::CUDNN_DATA_HALF;
                try!(API::set_filter_descriptor(generic_filter_desc, d_type, nb_dims, filter_dim.as_ptr()));
                Ok(FilterDescriptor::from_c(generic_filter_desc))
            }
        }
    }

    /// Initializes a new CUDA cuDNN FilterDescriptor from its C type.
    pub fn from_c(id: cudnnFilterDescriptor_t) -> FilterDescriptor {
        FilterDescriptor { id: id as isize }
    }

    /// Returns the id as isize.
    pub fn id(&self) -> isize {
        self.id
    }

    /// Returns the CUDA cuDNN FilterDescriptor as its C type.
    pub fn id_c(&self) -> cudnnFilterDescriptor_t {
        self.id as cudnnFilterDescriptor_t
    }
}

#[derive(Debug, Copy, Clone)]
/// Defines the available data types for the CUDA cuDNN data representation.
pub enum DataType {
    /// F32
    Float,
    /// F64
    Double,
    /// F16 (no native Rust support yet)
    Half,
}