Waves.h

//***************************************************************************************
// Waves.h by Frank Luna (C) 2011 All Rights Reserved.
//
// Performs the calculations for the wave simulation.  After the simulation has been
// updated, the client must copy the current solution into vertex buffers for rendering.
// This class only does the calculations, it does not do any drawing.
//***************************************************************************************

#ifndef WAVES_H
#define WAVES_H

#include <vector>
#include <list>
#include <DirectXMath.h>

struct WavePixel
{
	float earth = 0.f;
	float water = 0.f;
};

class Waves
{
public:
    Waves(int m, int n, float dx, float dt, float speed, float damping);
    Waves(const Waves& rhs) = delete;
    Waves& operator=(const Waves& rhs) = delete;
    ~Waves();

	int RowCount()const;
	int ColumnCount()const;
	int VertexCount()const;
	int TriangleCount()const;
	float Width()const;
	float Depth()const;

	// Returns the solution at the ith grid point.
	const DirectX::XMFLOAT3& Position(int i)const {
		return mCurrSolution[i];
	}

	// Returns the solution normal at the ith grid point.
    const DirectX::XMFLOAT3& Normal(int i)const { return mNormals[i]; }

	// Returns the unit tangent vector at the ith grid point in the local x-axis direction.
    const DirectX::XMFLOAT3& TangentX(int i)const { return mTangentX[i]; }

	void Update(float dt);
	std::vector<float> mEarth;
	std::vector<WavePixel> mPrevSolution;
	std::vector<DirectX::XMFLOAT3> mCurrSolution;

private:
    int wave_h = 0;
    int wave_w = 0;

    int mVertexCount = 0;
    int mTriangleCount = 0;

    // Simulation constants we can precompute.
    float mK1 = 0.0f;
    float mK2 = 0.0f;
    float mK3 = 0.0f;

    float mTimeStep = 0.0f;
    float mSpatialStep = 0.0f;
	float mTotalTime = 0.0f;

    std::vector<DirectX::XMFLOAT3> mNormals;
    std::vector<DirectX::XMFLOAT3> mTangentX;
};

#endif // WAVES_H