magnum/src/MeshTools/Test/CompressIndicesTest.cpp

/*
    Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz>

    This file is part of Magnum.

    Magnum is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License version 3
    only, as published by the Free Software Foundation.

    Magnum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Lesser General Public License version 3 for more details.
*/

#include <TestSuite/Tester.h>
#include <Utility/Endianness.h>

#include "MeshTools/CompressIndices.h"

using Corrade::Utility::Endianness;

namespace Magnum { namespace MeshTools { namespace Test {

class CompressIndicesTest: public Corrade::TestSuite::Tester {
    public:
        CompressIndicesTest();

        void compressChar();
        void compressShort();
        void compressInt();
};

CompressIndicesTest::CompressIndicesTest() {
    addTests(&CompressIndicesTest::compressChar,
             &CompressIndicesTest::compressShort,
             &CompressIndicesTest::compressInt);
}

void CompressIndicesTest::compressChar() {
    std::size_t indexCount;
    Mesh::IndexType indexType;
    char* data;
    std::tie(indexCount, indexType, data) = MeshTools::compressIndices(
        std::vector<UnsignedInt>{1, 2, 3, 0, 4});

    CORRADE_COMPARE(indexCount, 5);
    CORRADE_VERIFY(indexType == Mesh::IndexType::UnsignedByte);
    CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
        (std::vector<char>{ 0x01, 0x02, 0x03, 0x00, 0x04 }));

    delete[] data;
}

void CompressIndicesTest::compressShort() {
    std::size_t indexCount;
    Mesh::IndexType indexType;
    char* data;
    std::tie(indexCount, indexType, data) = MeshTools::compressIndices(
        std::vector<UnsignedInt>{1, 256, 0, 5});

    CORRADE_COMPARE(indexCount, 4);
    CORRADE_VERIFY(indexType == Mesh::IndexType::UnsignedShort);
    if(!Endianness::isBigEndian()) {
        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
            (std::vector<char>{ 0x01, 0x00,
                           0x00, 0x01,
                           0x00, 0x00,
                           0x05, 0x00 }));
    } else {
        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
            (std::vector<char>{ 0x00, 0x01,
                           0x01, 0x00,
                           0x00, 0x00,
                           0x00, 0x05 }));
    }

    delete[] data;
}

void CompressIndicesTest::compressInt() {
    std::size_t indexCount;
    Mesh::IndexType indexType;
    char* data;
    std::tie(indexCount, indexType, data) = MeshTools::compressIndices(
        std::vector<UnsignedInt>{65536, 3, 2});

    CORRADE_COMPARE(indexCount, 3);
    CORRADE_VERIFY(indexType == Mesh::IndexType::UnsignedInt);

    if(!Endianness::isBigEndian()) {
        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
            (std::vector<char>{ 0x00, 0x00, 0x01, 0x00,
                           0x03, 0x00, 0x00, 0x00,
                           0x02, 0x00, 0x00, 0x00 }));
    } else {
        CORRADE_COMPARE(std::vector<char>(data, data+indexCount*Mesh::indexSize(indexType)),
            (std::vector<char>{ 0x00, 0x01, 0x00, 0x00,
                           0x00, 0x00, 0x00, 0x03,
                           0x00, 0x00, 0x00, 0x02 }));
    }

    delete[] data;
}

}}}

CORRADE_TEST_MAIN(Magnum::MeshTools::Test::CompressIndicesTest)