test_struct.cpp

//---------------------------------------------------------------------------//
// Copyright (c) 2013-2014 Kyle Lutz <kyle.r.lutz@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//

#include <boost/compute/config.hpp>

#define BOOST_TEST_MODULE TestStruct
#include <boost/test/unit_test.hpp>

#include <boost/compute/function.hpp>
#include <boost/compute/algorithm/find_if.hpp>
#include <boost/compute/algorithm/transform.hpp>
#include <boost/compute/container/vector.hpp>
#include <boost/compute/functional/field.hpp>
#include <boost/compute/types/struct.hpp>
#include <boost/compute/type_traits/type_name.hpp>
#include <boost/compute/type_traits/type_definition.hpp>
#include <boost/compute/utility/source.hpp>

namespace compute = boost::compute;

// example code defining an atom class
namespace chemistry {

struct Atom
{
    Atom(float _x, float _y, float _z, int _number)
        : x(_x), y(_y), z(_z), number(_number)
    {
    }

    float x;
    float y;
    float z;
    int number;
};

} // end chemistry namespace

// adapt the chemistry::Atom class
BOOST_COMPUTE_ADAPT_STRUCT(chemistry::Atom, Atom, (x, y, z, number))

struct StructWithArray {
    int value;
    int array[3];
};

BOOST_COMPUTE_ADAPT_STRUCT(StructWithArray, StructWithArray, (value, array))

#include "check_macros.hpp"
#include "context_setup.hpp"

BOOST_AUTO_TEST_CASE(atom_type_name)
{
    BOOST_CHECK(std::strcmp(compute::type_name<chemistry::Atom>(), "Atom") == 0);
}

BOOST_AUTO_TEST_CASE(atom_struct)
{
    std::vector<chemistry::Atom> atoms;
    atoms.push_back(chemistry::Atom(1.f, 0.f, 0.f, 1));
    atoms.push_back(chemistry::Atom(0.f, 1.f, 0.f, 1));
    atoms.push_back(chemistry::Atom(0.f, 0.f, 0.f, 8));

    compute::vector<chemistry::Atom> vec(atoms.size(), context);
    compute::copy(atoms.begin(), atoms.end(), vec.begin(), queue);

    // find the oxygen atom
    BOOST_COMPUTE_FUNCTION(bool, is_oxygen, (chemistry::Atom atom),
    {
        return atom.number == 8;
    });

    compute::vector<chemistry::Atom>::iterator iter =
        compute::find_if(vec.begin(), vec.end(), is_oxygen, queue);
    BOOST_CHECK(iter == vec.begin() + 2);

    // copy the atomic numbers to another vector
    compute::vector<int> atomic_numbers(vec.size(), context);
    compute::transform(
        vec.begin(), vec.end(),
        atomic_numbers.begin(),
        compute::field<int>("number"),
        queue
    );
    CHECK_RANGE_EQUAL(int, 3, atomic_numbers, (1, 1, 8));
}

BOOST_AUTO_TEST_CASE(custom_kernel)
{
    std::vector<chemistry::Atom> data;
    data.push_back(chemistry::Atom(1.f, 0.f, 0.f, 1));
    data.push_back(chemistry::Atom(0.f, 1.f, 0.f, 1));
    data.push_back(chemistry::Atom(0.f, 0.f, 0.f, 8));

    compute::vector<chemistry::Atom> atoms(data.size(), context);
    compute::copy(data.begin(), data.end(), atoms.begin(), queue);

    std::string source = BOOST_COMPUTE_STRINGIZE_SOURCE(
        __kernel void custom_kernel(__global const Atom *atoms,
                                    __global float *distances)
        {
            const uint i = get_global_id(0);
            const __global Atom *atom = &atoms[i];

            const float4 center = { 0, 0, 0, 0 };
            const float4 position = { atom->x, atom->y, atom->z, 0 };

            distances[i] = distance(position, center);
        }
    );

    // add type definition for Atom to the start of the program source
    source = compute::type_definition<chemistry::Atom>() + "\n" + source;

    compute::program program =
        compute::program::build_with_source(source, context);

    compute::vector<float> distances(atoms.size(), context);

    compute::kernel custom_kernel = program.create_kernel("custom_kernel");
    custom_kernel.set_arg(0, atoms);
    custom_kernel.set_arg(1, distances);

    queue.enqueue_1d_range_kernel(custom_kernel, 0, atoms.size(), 1);
}

// Creates a StructWithArray containing 'x', 'y', 'z'.
StructWithArray make_struct_with_array(int x, int y, int z)
{
    StructWithArray s;
    s.value = 0;
    s.array[0] = x;
    s.array[1] = y;
    s.array[2] = z;
    return s;
}

BOOST_AUTO_TEST_CASE(struct_with_array)
{
    compute::vector<StructWithArray> structs(context);

    structs.push_back(make_struct_with_array(1, 2, 3), queue);
    structs.push_back(make_struct_with_array(4, 5, 6), queue);
    structs.push_back(make_struct_with_array(7, 8, 9), queue);

    BOOST_COMPUTE_FUNCTION(int, sum_array, (StructWithArray x),
    {
        return x.array[0] + x.array[1] + x.array[2];
    });

    compute::vector<int> results(structs.size(), context);
    compute::transform(
        structs.begin(), structs.end(), results.begin(), sum_array, queue
    );
    CHECK_RANGE_EQUAL(int, 3, results, (6, 15, 24));
}

BOOST_AUTO_TEST_SUITE_END()