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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.

#include "PhaseConfig.h"
#include "PsMathUtils.h"

namespace physx
{
namespace cloth
{
PhaseConfig transform(const PhaseConfig&);
}
}

using namespace physx;

namespace
{
float safeLog2(float x)
{
	float saturated = PxMax(0.0f, PxMin(x, 1.0f));
	return saturated ? shdfnd::log2(saturated) : -FLT_MAX_EXP;
}
}

cloth::PhaseConfig::PhaseConfig(uint16_t index)
: mPhaseIndex(index)
, mPadding(0xffff)
, mStiffness(1.0f)
, mStiffnessMultiplier(1.0f)
, mCompressionLimit(1.0f)
, mStretchLimit(1.0f)
{
}

// convert from user input to solver format
cloth::PhaseConfig cloth::transform(const PhaseConfig& config)
{
	PhaseConfig result(config.mPhaseIndex);

	result.mStiffness = safeLog2(1.0f - config.mStiffness);
	result.mStiffnessMultiplier = safeLog2(config.mStiffnessMultiplier);

	// negative for compression, positive for stretch
	result.mCompressionLimit = 1 - 1 / config.mCompressionLimit;
	result.mStretchLimit = 1 - 1 / config.mStretchLimit;

	return result;
}