Method AcquireUnit

GTE/Graphics/GL46/GL46Engine.cpp:800–838

}

int32_t GL46Engine::ProgramIndexUnitMap::AcquireUnit(GLint program, GLint index)
{
    int32_t availUnit = -1;
    for (int32_t unit = 0; unit < static_cast<int32_t>(mLinkMap.size()); ++unit)
    {
        auto& item = mLinkMap[unit];

        // Increment link count if already assigned and in use?
        if (program == item.program && index == item.index)
        {
            ++item.linkCount;
            return unit;
        }

        // Found a unit that was previously used but is now available.
        if (0 == item.linkCount)
        {
            if (-1 == availUnit)
            {
                availUnit = unit;
            }
        }
    }

    // New unit number not previously used?
    if (-1 == availUnit)
    {
        // TODO: Consider querying the max number of units and check that
        // this number is not exceeded.
        availUnit = static_cast<int32_t>(mLinkMap.size());
        mLinkMap.push_back({ 0, 0, 0 });
    }

    auto& item = mLinkMap[availUnit];
    item.linkCount = 1;
    item.program = program;
    item.index = index;
    return availUnit;
}

int32_t GL46Engine::ProgramIndexUnitMap::GetUnit(GLint program, GLint index) const
{