GteFluid2InitializeState.h

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// David Eberly, Geometric Tools, Redmond WA 98052
// Copyright (c) 1998-2017
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
// File Version: 3.0.0 (2016/06/19)

#pragma once

#include <Graphics/GteConstantBuffer.h>
#include <Graphics/GteProgramFactory.h>
#include <Graphics/GteTexture2.h>

namespace gte
{

class GraphicsEngine;

class GTE_IMPEXP Fluid2InitializeState
{
public:
    // Construction.  The initial velocity is zero and the initial density
    // is randomly generated with values in [0,1].
    Fluid2InitializeState(std::shared_ptr<ProgramFactory> const& factory,
        int xSize, int ySize, int numXThreads, int numYThreads);

    // Member access.  The texels are (velocity.x, velocity.y, 0, density).
    // The third component is unused in the simulation (a 3D simulation will
    // store velocity.z in this component).
    inline std::shared_ptr<Texture2> const& GetStateTm1() const;
    inline std::shared_ptr<Texture2> const& GetStateT() const;

    // Compute the initial density and initial velocity for the fluid
    // simulation.
    void Execute(std::shared_ptr<GraphicsEngine> const& engine);

private:
    int mNumXGroups, mNumYGroups;
    std::shared_ptr<ComputeProgram> mInitializeState;
    std::shared_ptr<Texture2> mDensity;
    std::shared_ptr<Texture2> mVelocity;
    std::shared_ptr<Texture2> mStateTm1;
    std::shared_ptr<Texture2> mStateT;

    // Shader source code as strings.
    static std::string const msGLSLSource;
    static std::string const msHLSLSource;
    static std::string const* msSource[ProgramFactory::PF_NUM_API];
};

inline std::shared_ptr<Texture2> const& Fluid2InitializeState::GetStateTm1() const
{
    return mStateTm1;
}

inline std::shared_ptr<Texture2> const& Fluid2InitializeState::GetStateT() const
{
    return mStateT;
}

}