GteFluid2InitializeSource.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 <Physics/GteFluid2Parameters.h>
#include <Graphics/GteConstantBuffer.h>
#include <Graphics/GteProgramFactory.h>
#include <Graphics/GteTexture2.h>

namespace gte
{

class GraphicsEngine;

class GTE_IMPEXP Fluid2InitializeSource
{
public:
    // Construction.  The source density consists of a density producer
    // (increase density) and a density consumer (decrease density).  Each
    // has a location, a variance from that location, and an amplitude.
    // The source velocity (impulse) is generated from gravity, a single
    // wind source, and randomly generated vortices.  Each vortex is
    // selected with a random location, a variance from that location, and
    // an amplitude for the impulse.
    Fluid2InitializeSource(std::shared_ptr<ProgramFactory> const& factory,
        int xSize, int ySize, int numXThreads, int numYThreads,
        std::shared_ptr<ConstantBuffer> const& parameters);

    // 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& GetSource() const;

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

private:
    enum { NUM_VORTICES = 1024 };

    struct Vortex
    {
        Vector4<float> data;
    };

    struct External
    {
        Vector4<float> densityProducer;
        Vector4<float> densityConsumer;
        Vector4<float> gravity;
        Vector4<float> wind;
    };

    int mNumXGroups, mNumYGroups;
    std::shared_ptr<ComputeProgram> mGenerateVortex;
    std::shared_ptr<ComputeProgram> mInitializeSource;
    std::shared_ptr<ConstantBuffer> mVortex;
    std::shared_ptr<ConstantBuffer> mExternal;
    std::shared_ptr<Texture2> mVelocity0;
    std::shared_ptr<Texture2> mVelocity1;
    std::shared_ptr<Texture2> mSource;

    // Shader source code as strings.
    static std::string const msGLSLGenerateSource;
    static std::string const msGLSLInitializeSource;
    static std::string const msHLSLGenerateSource;
    static std::string const msHLSLInitializeSource;
    static std::string const* msGenerateSource[ProgramFactory::PF_NUM_API];
    static std::string const* msInitializeSource[ProgramFactory::PF_NUM_API];
};

inline std::shared_ptr<Texture2> const& Fluid2InitializeSource::GetSource() const
{
    return mSource;
}

}