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#include "flag-combiner.h"
namespace gfx
{
using namespace Slang;
void FlagCombiner::add(uint32_t flags, ChangeType type)
{
// The flag/s must be set
SLANG_ASSERT(flags);
SLANG_ASSERT((flags & m_usedFlags) == 0);
// Mark the flags used
m_usedFlags |= flags;
if (type == ChangeType::On || type == ChangeType::OnOff)
{
m_invertBits |= flags;
}
if (type == ChangeType::OnOff || type == ChangeType::OffOn)
{
m_changingBits[m_numChangingBits++] = flags;
}
}
void FlagCombiner::calcCombinations(List<uint32_t>& outCombinations) const
{
const int numCombinations = getNumCombinations();
outCombinations.setCount(numCombinations);
uint32_t* dstCombinations = outCombinations.getBuffer();
for (int i = 0; i < numCombinations; ++i)
{
dstCombinations[i] = getCombination(i);
}
}
uint32_t FlagCombiner::getCombination(int index) const
{
SLANG_ASSERT(index >= 0 && index < getNumCombinations());
uint32_t combination = 0;
uint32_t bit = 1;
for (int i = m_numChangingBits - 1; i >= 0; --i, bit += bit)
{
combination |= ((bit & index) ? m_changingBits[i] : 0);
}
return combination ^ m_invertBits;
}
void FlagCombiner::reset()
{
m_numChangingBits = 0;
m_usedFlags = 0;
m_invertBits = 0;
}
} // namespace gfx
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