cudnn 0.1.3

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

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

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

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

impl ConvolutionDescriptor {
    /// Initializes a new CUDA cuDNN ConvolutionDescriptor.
    pub fn new(pad: &[i32], filter_stride: &[i32], upscale: &[i32], data_type: DataType) -> Result<ConvolutionDescriptor, Error> {
        let array_length = pad.len() as i32;

        let generic_convolution_desc = try!(API::create_convolution_descriptor());
        match data_type {
            DataType::Float => {
                let d_type = cudnnDataType_t::CUDNN_DATA_FLOAT;
                try!(API::set_convolution_descriptor(generic_convolution_desc, d_type, cudnnConvolutionMode_t::CUDNN_CONVOLUTION, array_length, pad.as_ptr(), filter_stride.as_ptr(), upscale.as_ptr()));
                Ok(ConvolutionDescriptor::from_c(generic_convolution_desc))
            },
            DataType::Double => {
                let d_type = cudnnDataType_t::CUDNN_DATA_DOUBLE;
                try!(API::set_convolution_descriptor(generic_convolution_desc, d_type, cudnnConvolutionMode_t::CUDNN_CONVOLUTION, array_length, pad.as_ptr(), filter_stride.as_ptr(), upscale.as_ptr()));
                Ok(ConvolutionDescriptor::from_c(generic_convolution_desc))
            },
            DataType::Half => {
                let d_type = cudnnDataType_t::CUDNN_DATA_HALF;
                try!(API::set_convolution_descriptor(generic_convolution_desc, d_type, cudnnConvolutionMode_t::CUDNN_CONVOLUTION, array_length, pad.as_ptr(), filter_stride.as_ptr(), upscale.as_ptr()));
                Ok(ConvolutionDescriptor::from_c(generic_convolution_desc))
            }
        }
    }

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

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

    /// Returns the CUDA cuDNN ConvolutionDescriptor as its C type.
    pub fn id_c(&self) -> cudnnConvolutionDescriptor_t {
        self.id as cudnnConvolutionDescriptor_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,
}