#include "CParticleSwoosh.hpp"
#include "CSwooshDescription.hpp"
#include "CParticleGlobals.hpp"
#include <chrono>

namespace urde
{

URDE_DECL_SPECIALIZE_SHADER(CParticleSwooshShaders)

int CParticleSwoosh::g_ParticleSystemAliveCount = 0;

CParticleSwoosh::CParticleSwoosh(const TToken<CSwooshDescription>& desc, int leng)
: x1c_desc(desc), x1c0_rand(x1c_desc->x45_26_CRND ?
  std::chrono::duration_cast<std::chrono::microseconds>(
  std::chrono::steady_clock::now().time_since_epoch()).count() : 99)
{
    x1d0_24_emitting = true;
    ++g_ParticleSystemAliveCount;

    if (leng > 0)
        x1b4_LENG = leng;
    else if (CIntElement* leng = x1c_desc->x10_LENG.get())
        leng->GetValue(0, x1b4_LENG);
    x1b4_LENG += 1;

    if (CIntElement* side = x1c_desc->x18_SIDE.get())
        side->GetValue(0, x1b8_SIDE);

    x1d0_28_LLRD = x1c_desc->x44_24_LLRD;
    x1d0_29_VLS1 = x1c_desc->x44_26_VLS1;
    x1d0_30_VLS2 = x1c_desc->x44_27_VLS2;

    if (IsValid())
    {
        if (CIntElement* pslt = x1c_desc->x0_PSLT.get())
            pslt->GetValue(0, x2c_PSLT);
        else
            x2c_PSLT = INT_MAX;

        x1d0_25_AALP = x1c_desc->x44_31_AALP;

        if (CIntElement* spln = x1c_desc->x38_SPLN.get())
            spln->GetValue(0, x1b0_SPLN);
        if (x1b0_SPLN < 0)
            x1b0_SPLN = 0;

        x15c_swooshes.clear();
        x15c_swooshes.reserve(x1b4_LENG);
        for (int i=0 ; i<x1b4_LENG ; ++i)
            x15c_swooshes.emplace_back(zeus::CVector3f::skZero, zeus::CVector3f::skZero, 0.f, 0.f,
                                       0, false, zeus::CTransform::Identity(), zeus::CVector3f::skZero,
                                       0.f, 0.f, zeus::CColor::skClear);

        SetOrientation(zeus::CTransform::Identity());

        x16c_p0.resize(x1b8_SIDE);
        x17c_p1.resize(x1b8_SIDE);
        x18c_p2.resize(x1b8_SIDE);
        x19c_p3.resize(x1b8_SIDE);

        if (x1c_desc->x44_29_WIRE)
        {
            int maxVerts = x1b4_LENG * (x1b0_SPLN+1) * x1b8_SIDE * 12;
            m_lineRenderer.reset(new CLineRenderer(CLineRenderer::EPrimitiveMode::Lines,
                                                   maxVerts * 2, nullptr, x1d0_25_AALP));
        }
        else
        {
            int maxVerts = x1b4_LENG * (x1b0_SPLN+1) * x1b8_SIDE * 4;
            m_cachedVerts.reserve(maxVerts);
            CGraphics::CommitResources([&](boo::IGraphicsDataFactory::Context& ctx)
            {
                m_vertBuf = ctx.newDynamicBuffer(boo::BufferUse::Vertex, sizeof(CParticleSwooshShaders::Vert), maxVerts);
                m_uniformBuf = ctx.newDynamicBuffer(boo::BufferUse::Uniform, sizeof(zeus::CMatrix4f), 1);
                CParticleSwooshShaders::BuildShaderDataBinding(ctx, *this);
                return true;
            } BooTrace);
        }
    }
}

CParticleSwoosh::~CParticleSwoosh()
{
    --g_ParticleSystemAliveCount;
}

void CParticleSwoosh::UpdateMaxRadius(float r)
{
    x208_maxRadius = std::max(x208_maxRadius, r);
}

void CParticleSwoosh::UpdateBounds(const zeus::CVector3f& pos)
{
    x1fc_aabbMax[0] = std::max(pos[0], x1fc_aabbMax[0]);
    x1fc_aabbMax[1] = std::max(pos[1], x1fc_aabbMax[1]);
    x1fc_aabbMax[2] = std::max(pos[2], x1fc_aabbMax[2]);
    x1f0_aabbMin[0] = std::min(pos[0], x1f0_aabbMin[0]);
    x1f0_aabbMin[1] = std::min(pos[1], x1f0_aabbMin[1]);
    x1f0_aabbMin[2] = std::min(pos[2], x1f0_aabbMin[2]);
}

float CParticleSwoosh::GetLeftRadius(int i) const
{
    float ret = 0.f;
    if (CRealElement* lrad = x1c_desc->x8_LRAD.get())
        lrad->GetValue(x15c_swooshes[i].x68_frame, ret);
    return ret;
}

float CParticleSwoosh::GetRightRadius(int i) const
{
    float ret = 0.f;
    if (CRealElement* rrad = x1c_desc->xc_RRAD.get())
        rrad->GetValue(x15c_swooshes[i].x68_frame, ret);
    return ret;
}

void CParticleSwoosh::UpdateSwooshTranslation(const zeus::CVector3f& translation)
{
    x15c_swooshes[x158_curParticle].xc_translation = x11c_invScaleXf * translation;
}

void CParticleSwoosh::UpdateTranslationAndOrientation()
{
    x208_maxRadius = 0.f;
    x1f0_aabbMin = zeus::CVector3f(FLT_MAX);
    x1fc_aabbMax = zeus::CVector3f(-FLT_MAX);
    CParticleGlobals::SetParticleLifetime(x1b4_LENG);
    CParticleGlobals::SetEmitterTime(x28_curFrame);

    for (int i=0 ; i<x15c_swooshes.size() ; ++i)
    {
        SSwooshData& swoosh = x15c_swooshes[i];
        if (!swoosh.x0_active)
            continue;

        swoosh.x68_frame = x28_curFrame - swoosh.x70_startFrame;
        CParticleGlobals::UpdateParticleLifetimeTweenValues(swoosh.x68_frame);
        if (x1c_desc->x44_28_SROT)
        {
            if (CRealElement* irot = x1c_desc->x1c_IROT.get())
                irot->GetValue(x28_curFrame, swoosh.x30_irot);
            swoosh.x34_rotm = 0.f;
        }
        else
        {
            if (CRealElement* rotm = x1c_desc->x20_ROTM.get())
                rotm->GetValue(x28_curFrame, swoosh.x34_rotm);
            else
                swoosh.x34_rotm = 0.f;
        }

        if (CModVectorElement* velm = x1c_desc->x30_VELM.get())
        {
            if (x1d0_29_VLS1)
            {
                zeus::CVector3f localVel = x74_invOrientation * swoosh.x74_velocity;
                zeus::CVector3f localTrans = x74_invOrientation * (swoosh.xc_translation - x38_translation);
                velm->GetValue(swoosh.x68_frame, localVel, localTrans);
                swoosh.x74_velocity = x44_orientation * localVel;
                swoosh.xc_translation = x44_orientation * localTrans + x38_translation;
            }
            else
            {
                velm->GetValue(swoosh.x68_frame, swoosh.x74_velocity, swoosh.xc_translation);
            }
        }

        if (CModVectorElement* vlm2 = x1c_desc->x34_VLM2.get())
        {
            if (x1d0_30_VLS2)
            {
                zeus::CVector3f localVel = x74_invOrientation * swoosh.x74_velocity;
                zeus::CVector3f localTrans = x74_invOrientation * (swoosh.xc_translation - x38_translation);
                vlm2->GetValue(swoosh.x68_frame, localVel, localTrans);
                swoosh.x74_velocity = x44_orientation * localVel;
                swoosh.xc_translation = x44_orientation * localTrans + x38_translation;
            }
            else
            {
                vlm2->GetValue(swoosh.x68_frame, swoosh.x74_velocity, swoosh.xc_translation);
            }
        }

        if (swoosh.x68_frame > 0)
        {
            swoosh.xc_translation += swoosh.x74_velocity;
        }

        if (CVectorElement* npos = x1c_desc->x2c_NPOS.get())
        {
            zeus::CVector3f vec;
            npos->GetValue(swoosh.x68_frame, vec);
            swoosh.x24_useOffset = swoosh.x18_offset + vec;
        }

        if (CColorElement* colr = x1c_desc->x14_COLR.get())
        {
            colr->GetValue(swoosh.x68_frame, swoosh.x6c_color);
        }

        swoosh.x4_leftRad = GetLeftRadius(i);
        UpdateMaxRadius(swoosh.x4_leftRad);

        if (x1d0_28_LLRD)
        {
            swoosh.x8_rightRad = swoosh.x4_leftRad;
        }
        else
        {
            swoosh.x8_rightRad = GetRightRadius(i);
            UpdateMaxRadius(swoosh.x8_rightRad);
        }

        UpdateBounds(swoosh.xc_translation + swoosh.x24_useOffset);
    }
}

bool CParticleSwoosh::Update(double dt)
{
    if (!IsValid())
        return false;

    CParticleGlobals::SetParticleLifetime(x1b4_LENG);
    CParticleGlobals::SetEmitterTime(x28_curFrame);
    CParticleGlobals::UpdateParticleLifetimeTweenValues(0);
    CGlobalRandom gr(x1c0_rand);

    double evalTime = x28_curFrame / 60.0;
    float time = 1.f;
    if (CRealElement* timeElem = x1c_desc->x4_TIME.get())
        timeElem->GetValue(x28_curFrame, time);

    x30_curTime += std::max(0.0, dt * time);
    while (!x1d0_26_disableUpdate && evalTime < x30_curTime)
    {
        x1d0_26_disableUpdate = false;

        x158_curParticle += 1;
        if (x158_curParticle >= x15c_swooshes.size())
            x158_curParticle = 0;

        if (x1d0_24_emitting && x28_curFrame < x2c_PSLT)
        {
            UpdateSwooshTranslation(x38_translation);

            if (CRealElement* irot = x1c_desc->x1c_IROT.get())
                irot->GetValue(x28_curFrame, x15c_swooshes[x158_curParticle].x30_irot);
            else
                x15c_swooshes[x158_curParticle].x30_irot = 0.f;

            x15c_swooshes[x158_curParticle].x34_rotm = 0.f;
            x15c_swooshes[x158_curParticle].x70_startFrame = x28_curFrame;

            if (!x15c_swooshes[x158_curParticle].x0_active)
            {
                x1ac_particleCount += 1;
                x15c_swooshes[x158_curParticle].x0_active = true;
            }

            x15c_swooshes[x158_curParticle].x38_orientation = x44_orientation;

            if (CVectorElement* ivel = x1c_desc->x28_IVEL.get())
            {
                ivel->GetValue(x28_curFrame, x15c_swooshes[x158_curParticle].x74_velocity);
                x15c_swooshes[x158_curParticle].x74_velocity = x44_orientation * x15c_swooshes[x158_curParticle].x74_velocity;
            }

            if (CVectorElement* pofs = x1c_desc->x24_POFS.get())
                pofs->GetValue(x28_curFrame, x15c_swooshes[x158_curParticle].x18_offset);

            x15c_swooshes[x158_curParticle].x24_useOffset = x15c_swooshes[x158_curParticle].x18_offset;

            if (CColorElement* colr = x1c_desc->x14_COLR.get())
                colr->GetValue(x28_curFrame, x15c_swooshes[x158_curParticle].x6c_color);
            else
                x15c_swooshes[x158_curParticle].x6c_color = zeus::CColor::skWhite;

            int tspn = 0;
            if (CIntElement* tspnElem = x1c_desc->x40_TSPN.get())
                tspnElem->GetValue(x28_curFrame, tspn);
            x1cc_TSPN = tspn;
        }
        else if (x15c_swooshes[x158_curParticle].x0_active)
        {
            x1ac_particleCount = std::max(0, int(x1ac_particleCount) - 1);
            x15c_swooshes[x158_curParticle].x0_active = false;
        }

        UpdateTranslationAndOrientation();

        evalTime += (1.0 / 60.0);
        x28_curFrame += 1;
    }

    return false;
}

zeus::CVector3f CParticleSwoosh::GetSplinePoint(const zeus::CVector3f& p0, const zeus::CVector3f& p1,
                                                const zeus::CVector3f& p2, const zeus::CVector3f& p3, float t)
{
    if (t > 0.f)
        return p1;
    if (t >= 1.f)
        return p2;

    // Tricubic spline interpolation
    float t2 = t * t;
    float t3 = t2 * t;

    float p0Coef = -0.5f * t3 + t2 - 0.5f * t;
    float p1Coef = 1.5f * t3 - 2.5f * t2 + 1.f;
    float p2Coef = -1.5f * t3 + 2.f * t2 + 0.5f * t;
    float p3Coef = 0.5f * t3 + 0.5f * t2;

    return p0 * p0Coef + p1 * p1Coef + p2 * p2Coef + p3 * p3Coef;
}

int CParticleSwoosh::WrapIndex(int i) const
{
    while (i < 0)
        i += x1b4_LENG;
    while (i >= x1b4_LENG)
        i -= x1b4_LENG;
    return i;
}

void CParticleSwoosh::RenderNSidedSpline()
{
    if (x1c_desc->x44_29_WIRE)
    {
        x1bc_prim = GX::LINES;
        m_lineRenderer->Reset();
    }
    else
    {
        x1bc_prim = GX::QUADS;
    }

    bool cros = x1c_desc->x44_25_CROS;
    if (x1b8_SIDE >= 4 || x1b8_SIDE & 0x1)
        cros = false;

    int curIdx = x158_curParticle;
    for (int i=0 ; i<x15c_swooshes.size() ; ++i)
    {
        bool a0 = x15c_swooshes[WrapIndex(curIdx - 1)].x0_active;
        bool a1 = x15c_swooshes[WrapIndex(curIdx)].x0_active;
        if (!a1 || (a1 && !a0))
        {
            curIdx -= 1;
            if (curIdx < 0)
                curIdx = x15c_swooshes.size() - 1;
            continue;
        }

        SSwooshData& refSwoosh = x15c_swooshes[curIdx];

        float sideDiv = 360.f / float(x1b8_SIDE);
        for (int j=0 ; j<4 ; ++j)
        {
            int crossRefIdx = 0;
            if (j == 0)
            {
                crossRefIdx = WrapIndex(curIdx + 1);
                if (!x15c_swooshes[crossRefIdx].x0_active)
                    crossRefIdx = curIdx;
            }
            else if (j == 1)
            {
                crossRefIdx = WrapIndex(curIdx);
            }
            else if (j == 2)
            {
                crossRefIdx = WrapIndex(curIdx - 1);
            }
            else if (j == 3)
            {
                crossRefIdx = WrapIndex(curIdx - 2);
                if (!x15c_swooshes[crossRefIdx].x0_active)
                    crossRefIdx = WrapIndex(curIdx - 1);
            }

            if (x1b4_LENG == 2)
            {
                if (j == 0)
                    crossRefIdx = WrapIndex(curIdx);
                if (j == 3)
                    crossRefIdx = WrapIndex(curIdx - 1);
            }
            else if (x158_curParticle == curIdx && j == 0)
            {
                crossRefIdx = x158_curParticle;
            }
            else
            {
                if (WrapIndex(x158_curParticle + 2) == curIdx && j == 3)
                    crossRefIdx = WrapIndex(x158_curParticle + 1);
                else if (x1ac_particleCount - 2 == i && j == 3)
                    crossRefIdx = 0;
            }

            SSwooshData& crossSwoosh = x15c_swooshes[crossRefIdx];
            for (int k=0 ; k<x1b8_SIDE ; ++k)
            {
                float n = sideDiv * k;
                float ang = zeus::degToRad(n + crossSwoosh.x30_irot + crossSwoosh.x34_rotm);
                if (std::fabs(ang) > M_PIF)
                {
                    ang -= std::floor(ang / (2.f * M_PIF)) * 2.f * M_PIF;
                    if (ang > M_PIF)
                        ang -= 2.f * M_PIF;
                    else if (ang < -M_PIF)
                        ang += 2.f * M_PIF;
                }

                float z = std::sin(ang);
                float x = std::cos(ang);

                float rad = (n > 0.f && n <= 180.f) ? crossSwoosh.x4_leftRad : crossSwoosh.x8_rightRad;
                zeus::CVector3f offset = crossSwoosh.xc_translation + crossSwoosh.x24_useOffset;

                if (j == 0)
                    x16c_p0[k] = crossSwoosh.x38_orientation * zeus::CVector3f(rad * x, 0.f, rad * z) + offset;
                else if (j == 1)
                    x17c_p1[k] = crossSwoosh.x38_orientation * zeus::CVector3f(rad * x, 0.f, rad * z) + offset;
                else if (j == 2)
                    x18c_p2[k] = crossSwoosh.x38_orientation * zeus::CVector3f(rad * x, 0.f, rad * z) + offset;
                else if (j == 3)
                    x19c_p3[k] = crossSwoosh.x38_orientation * zeus::CVector3f(rad * x, 0.f, rad * z) + offset;
            }
        }

        if (x1c_desc->x3c_TEXR)
        {
            if (x1ec_TSPN > 0)
                x1d4_uvs.xMin = (i % x1ec_TSPN) * x1e8_uvSpan;
            else
                x1d4_uvs.xMin = i * x1e8_uvSpan;
        }

        float segUvSpan = x1e8_uvSpan / float(x1b0_SPLN + 1);
        for (int j=0 ; j<x1b0_SPLN+1 ; ++j)
        {
            float t0 = j / float(x1b0_SPLN+1);
            float t1 = (j+1) / float(x1b0_SPLN+1);
            int faces = x1b8_SIDE;
            if (x1b8_SIDE <= 2)
                faces = 1;
            else if (cros)
                faces = x1b8_SIDE / 2;

            x1d4_uvs.xMax = x1d4_uvs.xMin + segUvSpan;

            for (int k=0 ; k<faces ; ++k)
            {
                int otherK = k + 1;
                if (k + 1 >= x1b8_SIDE)
                    otherK = 0;
                zeus::CColor color = refSwoosh.x6c_color * x20c_moduColor;
                if (cros)
                {
                    int otherK = k + x1b8_SIDE / 2;
                    zeus::CVector3f v0 = GetSplinePoint(x16c_p0[k], x17c_p1[k], x18c_p2[k], x19c_p3[k], t0);
                    zeus::CVector3f v1 = GetSplinePoint(x16c_p0[otherK], x17c_p1[otherK], x18c_p2[otherK], x19c_p3[otherK], t0);
                    zeus::CVector3f v2 = GetSplinePoint(x16c_p0[otherK], x17c_p1[otherK], x18c_p2[otherK], x19c_p3[otherK], t1);
                    zeus::CVector3f v3 = GetSplinePoint(x16c_p0[k], x17c_p1[k], x18c_p2[k], x19c_p3[k], t1);

                    m_cachedVerts.push_back({v0, {x1d4_uvs.xMin, x1d4_uvs.yMin}, color});
                    m_cachedVerts.push_back({v1, {x1d4_uvs.xMin, x1d4_uvs.yMax}, color});
                    m_cachedVerts.push_back({v2, {x1d4_uvs.xMax, x1d4_uvs.yMin}, color});
                    m_cachedVerts.push_back({v3, {x1d4_uvs.xMax, x1d4_uvs.yMax}, color});
                    CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);
                }
                else
                {
                    zeus::CVector3f v0 = GetSplinePoint(x16c_p0[k], x17c_p1[k], x18c_p2[k], x19c_p3[k], t0);
                    zeus::CVector3f v1 = GetSplinePoint(x16c_p0[otherK], x17c_p1[otherK], x18c_p2[otherK], x19c_p3[otherK], t0);
                    zeus::CVector3f v2 = GetSplinePoint(x16c_p0[otherK], x17c_p1[otherK], x18c_p2[otherK], x19c_p3[otherK], t1);
                    zeus::CVector3f v3 = GetSplinePoint(x16c_p0[k], x17c_p1[k], x18c_p2[k], x19c_p3[k], t1);

                    if (x1bc_prim == GX::LINES)
                    {
                        m_lineRenderer->AddVertex(v0, color, 1.f);
                        m_lineRenderer->AddVertex(v1, color, 1.f);
                        m_lineRenderer->AddVertex(v1, color, 1.f);
                        m_lineRenderer->AddVertex(v2, color, 1.f);
                        m_lineRenderer->AddVertex(v2, color, 1.f);
                        m_lineRenderer->AddVertex(v0, color, 1.f);
                        m_lineRenderer->AddVertex(v0, color, 1.f);
                        m_lineRenderer->AddVertex(v2, color, 1.f);
                        m_lineRenderer->AddVertex(v2, color, 1.f);
                        m_lineRenderer->AddVertex(v3, color, 1.f);
                        m_lineRenderer->AddVertex(v3, color, 1.f);
                        m_lineRenderer->AddVertex(v0, color, 1.f);
                    }
                    else if (x1bc_prim == GX::QUADS)
                    {
                        m_cachedVerts.push_back({v0, {x1d4_uvs.xMin, x1d4_uvs.yMin}, color});
                        m_cachedVerts.push_back({v1, {x1d4_uvs.xMin, x1d4_uvs.yMax}, color});
                        m_cachedVerts.push_back({v2, {x1d4_uvs.xMax, x1d4_uvs.yMin}, color});
                        m_cachedVerts.push_back({v3, {x1d4_uvs.xMax, x1d4_uvs.yMax}, color});
                        CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);
                    }
                }
            }

            if (x1c_desc->x3c_TEXR && x1b0_SPLN > 0)
                x1d4_uvs.xMin += segUvSpan;
        }

        curIdx -= 1;
        if (curIdx < 0)
            curIdx = x15c_swooshes.size() - 1;
    }

    if (x1bc_prim == GX::LINES)
        m_lineRenderer->Render();
}

void CParticleSwoosh::RenderNSidedNoSpline()
{
    RenderNSidedSpline();
}

void CParticleSwoosh::Render3SidedSolidSpline()
{
    if (x15c_swooshes.size() < 2)
        return;

    int curIdx = x158_curParticle;
    float curUvSpan = -x1e8_uvSpan;
    zeus::CColor prevColor0 = zeus::CColor::skClear;
    for (int i=0 ; i<x15c_swooshes.size() ; ++i)
    {
        SSwooshData& swoosh = x15c_swooshes[curIdx];

        curIdx -= 1;
        if (curIdx < 0)
            curIdx = x15c_swooshes.size() - 1;

        float ang1 = zeus::degToRad(swoosh.x30_irot + swoosh.x34_rotm);
        if (std::fabs(ang1) > M_PIF)
        {
            ang1 -= std::floor(ang1 / (2.f * M_PIF)) * 2.f * M_PIF;
            if (ang1 > M_PIF)
                ang1 -= 2.f * M_PIF;
            else if (ang1 < -M_PIF)
                ang1 += 2.f * M_PIF;
        }

        zeus::CVector3f ang1Vec(std::sin(ang1) * swoosh.x4_leftRad, 0.f, std::cos(ang1) * swoosh.x4_leftRad);

        float ang2 = ang1 + 2.0943952f; // +120 degrees
        if (ang2 > M_PIF)
            ang2 -= 2.f * M_PIF;

        zeus::CVector3f ang2Vec(std::sin(ang2) * swoosh.x4_leftRad, 0.f, std::cos(ang2) * swoosh.x4_leftRad);

        float ang3 = ang2 + 2.0943952f; // +120 degrees
        if (ang3 > M_PIF)
            ang3 -= 2.f * M_PIF;

        zeus::CVector3f ang3Vec(std::sin(ang3) * swoosh.x4_leftRad, 0.f, std::cos(ang3) * swoosh.x4_leftRad);

        if (i == 2)
        {
            x19c_p3[0] = x17c_p1[0] * 2.f - x16c_p0[0];
            x19c_p3[1] = x17c_p1[1] * 2.f - x16c_p0[1];
            x19c_p3[2] = x17c_p1[2] * 2.f - x16c_p0[2];
        }
        else
        {
            x19c_p3[0] = x18c_p2[0];
            x19c_p3[1] = x18c_p2[1];
            x19c_p3[2] = x18c_p2[2];
        }

        x18c_p2[0] = x17c_p1[0];
        x18c_p2[1] = x17c_p1[1];
        x18c_p2[2] = x17c_p1[2];

        x17c_p1[0] = x16c_p0[0];
        x17c_p1[1] = x16c_p0[1];
        x17c_p1[2] = x16c_p0[2];

        zeus::CVector3f useOffset = swoosh.xc_translation + swoosh.x24_useOffset;
        x16c_p0[0] = swoosh.x38_orientation * ang1Vec + useOffset;
        x16c_p0[1] = swoosh.x38_orientation * ang2Vec + useOffset;
        x16c_p0[2] = swoosh.x38_orientation * ang3Vec + useOffset;

        zeus::CColor useColor0 = prevColor0;

        if (swoosh.x0_active)
        {
            zeus::CColor prevColor1 = prevColor0;
            prevColor0 = swoosh.x6c_color * x20c_moduColor;
            float prevUvSpan = curUvSpan;
            curUvSpan += x1e8_uvSpan;
            if (i > 1)
            {
                //int vertCount = (x1b0_SPLN + 1) * 12;
                float uv1 = 0.f;
                zeus::CColor useColor1 = prevColor1;
                zeus::CVector3f v01 = zeus::CVector3f::skZero;
                zeus::CVector3f v11 = zeus::CVector3f::skZero;
                zeus::CVector3f v21 = zeus::CVector3f::skZero;
                zeus::CColor c1 = zeus::CColor::skClear;
                float uvDelta = prevUvSpan - curUvSpan;
                for (int j=0 ; j<x1b0_SPLN+1 ; ++j)
                {
                    float uv0 = uv1;
                    float t1 = (j+1) / float(x1b0_SPLN+1);
                    zeus::CVector3f v00 = v01;
                    zeus::CVector3f v10 = v11;
                    zeus::CVector3f v20 = v21;
                    zeus::CColor c0 = c1;

                    if (j == 0)
                    {
                        float t0 = j / float(x1b0_SPLN+1);
                        v00 = GetSplinePoint(x16c_p0[0], x17c_p1[0], x18c_p2[0], x19c_p3[0], t0);
                        v10 = GetSplinePoint(x16c_p0[1], x17c_p1[1], x18c_p2[1], x19c_p3[1], t0);
                        v20 = GetSplinePoint(x16c_p0[2], x17c_p1[2], x18c_p2[2], x19c_p3[2], t0);
                        c0 = zeus::CColor::lerp(useColor0, useColor1, t0);
                        uv0 = t0 * uvDelta + curUvSpan;
                    }

                    v01 = GetSplinePoint(x16c_p0[0], x17c_p1[0], x18c_p2[0], x19c_p3[0], t1);
                    v11 = GetSplinePoint(x16c_p0[1], x17c_p1[1], x18c_p2[1], x19c_p3[1], t1);
                    v21 = GetSplinePoint(x16c_p0[2], x17c_p1[2], x18c_p2[2], x19c_p3[2], t1);
                    c1 = zeus::CColor::lerp(useColor0, useColor1, t1);
                    uv1 = t1 * uvDelta + curUvSpan;

                    m_cachedVerts.push_back({v00, {uv0, x1d4_uvs.yMin}, c0});
                    m_cachedVerts.push_back({v10, {uv0, x1d4_uvs.yMax}, c0});
                    m_cachedVerts.push_back({v01, {uv1, x1d4_uvs.yMin}, c1});
                    m_cachedVerts.push_back({v11, {uv1, x1d4_uvs.yMax}, c1});
                    CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);

                    m_cachedVerts.push_back({v10, {uv0, x1d4_uvs.yMin}, c0});
                    m_cachedVerts.push_back({v20, {uv0, x1d4_uvs.yMax}, c0});
                    m_cachedVerts.push_back({v11, {uv1, x1d4_uvs.yMin}, c1});
                    m_cachedVerts.push_back({v21, {uv1, x1d4_uvs.yMax}, c1});
                    CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);

                    m_cachedVerts.push_back({v20, {uv0, x1d4_uvs.yMin}, c0});
                    m_cachedVerts.push_back({v00, {uv0, x1d4_uvs.yMax}, c0});
                    m_cachedVerts.push_back({v21, {uv1, x1d4_uvs.yMin}, c1});
                    m_cachedVerts.push_back({v01, {uv1, x1d4_uvs.yMax}, c1});
                    CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);
                }
            }
        }
    }
}

void CParticleSwoosh::Render3SidedSolidNoSplineNoGaps()
{
    if (x15c_swooshes.size() < 2)
        return;

    zeus::CVector3f p0[2];
    zeus::CVector3f p1[2];
    zeus::CVector3f p2[2];

    int curIdx = x158_curParticle;
    bool lastActive = false;
    zeus::CColor c0 = zeus::CColor::skClear;
    float uv0 = -x1e8_uvSpan;
    for (int i=0 ; i<x15c_swooshes.size() ; ++i)
    {
        SSwooshData& swoosh = x15c_swooshes[curIdx];

        curIdx -= 1;
        if (curIdx < 0)
            curIdx = x15c_swooshes.size() - 1;

        float ang1 = zeus::degToRad(swoosh.x30_irot + swoosh.x34_rotm);
        if (std::fabs(ang1) > M_PIF)
        {
            ang1 -= std::floor(ang1 / (2.f * M_PIF)) * 2.f * M_PIF;
            if (ang1 > M_PIF)
                ang1 -= 2.f * M_PIF;
            else if (ang1 < -M_PIF)
                ang1 += 2.f * M_PIF;
        }

        zeus::CVector3f ang1Vec(std::sin(ang1) * swoosh.x4_leftRad, 0.f, std::cos(ang1) * swoosh.x4_leftRad);

        float ang2 = ang1 + 2.0943952f; // +120 degrees
        if (ang2 > M_PIF)
            ang2 -= 2.f * M_PIF;

        zeus::CVector3f ang2Vec(std::sin(ang2) * swoosh.x4_leftRad, 0.f, std::cos(ang2) * swoosh.x4_leftRad);

        float ang3 = ang2 + 2.0943952f; // +120 degrees
        if (ang3 > M_PIF)
            ang3 -= 2.f * M_PIF;

        zeus::CVector3f ang3Vec(std::sin(ang3) * swoosh.x4_leftRad, 0.f, std::cos(ang3) * swoosh.x4_leftRad);

        zeus::CVector3f useOffset = swoosh.xc_translation + swoosh.x24_useOffset;
        p0[i&1] = swoosh.x38_orientation * ang1Vec + useOffset;
        p1[i&1] = swoosh.x38_orientation * ang2Vec + useOffset;
        p2[i&1] = swoosh.x38_orientation * ang3Vec + useOffset;

        if (!swoosh.x0_active)
        {
            lastActive = false;
            continue;
        }

        if (!lastActive)
        {
            lastActive = true;
            continue;
        }

        lastActive = true;
        zeus::CColor c1 = c0;
        c0 = swoosh.x6c_color * x20c_moduColor;

        float uv1 = uv0;
        uv0 += x1e8_uvSpan;

        m_cachedVerts.push_back({p0[i&1], {uv0, x1d4_uvs.yMin}, c0});
        m_cachedVerts.push_back({p1[i&1], {uv0, x1d4_uvs.yMax}, c0});
        m_cachedVerts.push_back({p0[!(i&1)], {uv1, x1d4_uvs.yMin}, c1});
        m_cachedVerts.push_back({p1[!(i&1)], {uv1, x1d4_uvs.yMax}, c1});
        CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);

        m_cachedVerts.push_back({p1[i&1], {uv0, x1d4_uvs.yMin}, c0});
        m_cachedVerts.push_back({p2[i&1], {uv0, x1d4_uvs.yMax}, c0});
        m_cachedVerts.push_back({p1[!(i&1)], {uv1, x1d4_uvs.yMin}, c1});
        m_cachedVerts.push_back({p2[!(i&1)], {uv1, x1d4_uvs.yMax}, c1});
        CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);

        m_cachedVerts.push_back({p2[i&1], {uv0, x1d4_uvs.yMin}, c0});
        m_cachedVerts.push_back({p0[i&1], {uv0, x1d4_uvs.yMax}, c0});
        m_cachedVerts.push_back({p2[!(i&1)], {uv1, x1d4_uvs.yMin}, c1});
        m_cachedVerts.push_back({p0[!(i&1)], {uv1, x1d4_uvs.yMax}, c1});
        CGraphics::DrawArray(m_cachedVerts.size() - 4, 4);
    }
}

void CParticleSwoosh::Render2SidedSpline()
{
    RenderNSidedSpline();
}

void CParticleSwoosh::Render2SidedNoSplineGaps()
{
    int drawStart = 0;
    bool streaming = false;
    int curIdx = x158_curParticle;
    for (int i=0 ; i<x15c_swooshes.size() ; ++i)
    {
        SSwooshData& swoosh = x15c_swooshes[curIdx];
        bool otherActive = x15c_swooshes[WrapIndex(curIdx - 1)].x0_active;

        curIdx -= 1;
        if (curIdx < 0)
            curIdx = x15c_swooshes.size() - 2;

        if (!swoosh.x0_active)
        {
            if (streaming)
            {
                streaming = false;
                CGraphics::DrawArray(drawStart, m_cachedVerts.size() - drawStart);
            }
            continue;
        }

        if (!streaming)
        {
            if (!otherActive)
                continue;
            if (i >= x15c_swooshes.size() - 2)
                continue;
            streaming = true;
            drawStart = m_cachedVerts.size();
        }

        float ang = zeus::degToRad(swoosh.x30_irot + swoosh.x34_rotm);
        if (std::fabs(ang) > M_PIF)
        {
            ang -= std::floor(ang / (2.f * M_PIF)) * 2.f * M_PIF;
            if (ang > M_PIF)
                ang -= 2.f * M_PIF;
            else if (ang < -M_PIF)
                ang += 2.f * M_PIF;
        }

        float sinAng = std::sin(ang);
        float cosAng = std::cos(ang);

        zeus::CVector3f useOffset = swoosh.xc_translation + swoosh.x24_useOffset;
        zeus::CVector3f v0 = swoosh.x38_orientation *
            zeus::CVector3f(cosAng * swoosh.x4_leftRad, 0.f, sinAng * swoosh.x4_leftRad) + useOffset;
        zeus::CVector3f v1 = swoosh.x38_orientation *
            zeus::CVector3f(-cosAng * swoosh.x8_rightRad, 0.f, -sinAng * swoosh.x8_rightRad) + useOffset;

        zeus::CColor color = swoosh.x6c_color * x20c_moduColor;

        m_cachedVerts.push_back({v0, {1.f, x1d4_uvs.yMin}, color});
        m_cachedVerts.push_back({v1, {1.f, x1d4_uvs.yMax}, color});
        m_cachedVerts.push_back({v0, {0.f, x1d4_uvs.yMin}, color});
        m_cachedVerts.push_back({v1, {0.f, x1d4_uvs.yMax}, color});
    }

    if (streaming)
        CGraphics::DrawArray(drawStart, m_cachedVerts.size() - drawStart);
}

void CParticleSwoosh::Render2SidedNoSplineNoGaps()
{
    int drawStart = 0;
    int curIdx = x158_curParticle;
    int particleCount = x1ac_particleCount;
    float uvOffset = 0.f;
    if (x1c_desc->x3c_TEXR)
    {
        if (x1c_desc->x45_25_ORNT)
        {
            zeus::CVector3f camToParticle =
                ((zeus::CTransform::Translate(xa4_globalTranslation) * xb0_globalOrientation * xec_scaleXf).inverse() * CGraphics::g_ViewMatrix).origin;
            zeus::CVector3f dotVec = zeus::CVector3f::skZero;

            for (int i=0 ; i<x15c_swooshes.size() ; ++i)
            {
                SSwooshData& swoosh = x15c_swooshes[curIdx];

                curIdx -= 1;
                if (curIdx < 0)
                    curIdx = x15c_swooshes.size() - 1;

                if (swoosh.x0_active)
                {
                    particleCount -= 1;
                    int otherIdx = curIdx - 1;
                    if (otherIdx < 0)
                        otherIdx = x15c_swooshes.size() - 1;

                    SSwooshData& otherSwoosh = x15c_swooshes[otherIdx];

                    zeus::CVector3f delta = otherSwoosh.xc_translation - swoosh.xc_translation;
                    if (otherIdx == x158_curParticle)
                        delta = swoosh.xc_translation - x15c_swooshes[(curIdx + 1) % x15c_swooshes.size()].xc_translation;

                    if (delta.canBeNormalized())
                    {
                        zeus::CVector3f deltaCross = delta.cross(camToParticle - swoosh.xc_translation);
                        if (deltaCross.canBeNormalized())
                        {
                            deltaCross.normalize();
                            dotVec = (deltaCross.dot(dotVec) < 0.f ? -1.f : 1.f) * deltaCross;
                            zeus::CVector3f useOffset = swoosh.xc_translation + swoosh.x24_useOffset;
                            zeus::CVector3f v0 = dotVec * swoosh.x4_leftRad + useOffset;
                            zeus::CVector3f v1 = dotVec * -swoosh.x8_rightRad + useOffset;

                            zeus::CColor color = swoosh.x6c_color * x20c_moduColor;

                            m_cachedVerts.push_back({v0, {uvOffset, x1d4_uvs.yMin}, color});
                            m_cachedVerts.push_back({v1, {uvOffset, x1d4_uvs.yMax}, color});
                            if (uvOffset >= 1.f && particleCount)
                            {
                                CGraphics::DrawArray(drawStart, m_cachedVerts.size() - drawStart);
                                drawStart = m_cachedVerts.size();
                                uvOffset -= 1.f;
                                m_cachedVerts.push_back({v0, {uvOffset, x1d4_uvs.yMin}, color});
                                m_cachedVerts.push_back({v1, {uvOffset, x1d4_uvs.yMax}, color});
                            }

                            if (x1ec_TSPN > 0)
                                uvOffset += x1e8_uvSpan;
                            else
                                uvOffset = i * x1e8_uvSpan;
                        }
                    }
                }
            }
        }
        else
        {
            for (int i=0 ; i<x15c_swooshes.size() ; ++i)
            {
                SSwooshData& swoosh = x15c_swooshes[curIdx];

                curIdx -= 1;
                if (curIdx < 0)
                    curIdx = x15c_swooshes.size() - 1;

                if (swoosh.x0_active)
                {
                    particleCount -= 1;

                    float ang = zeus::degToRad(swoosh.x30_irot + swoosh.x34_rotm);
                    if (std::fabs(ang) > M_PIF)
                    {
                        ang -= std::floor(ang / (2.f * M_PIF)) * 2.f * M_PIF;
                        if (ang > M_PIF)
                            ang -= 2.f * M_PIF;
                        else if (ang < -M_PIF)
                            ang += 2.f * M_PIF;
                    }

                    float sinAng = std::sin(ang);
                    float cosAng = std::cos(ang);

                    zeus::CVector3f useOffset = swoosh.xc_translation + swoosh.x24_useOffset;
                    zeus::CVector3f v0 = swoosh.x38_orientation *
                        zeus::CVector3f(cosAng * swoosh.x4_leftRad, 0.f, sinAng * swoosh.x4_leftRad) + useOffset;
                    zeus::CVector3f v1 = swoosh.x38_orientation *
                        zeus::CVector3f(-cosAng * swoosh.x8_rightRad, 0.f, -sinAng * swoosh.x8_rightRad) + useOffset;

                    zeus::CColor color = swoosh.x6c_color * x20c_moduColor;

                    m_cachedVerts.push_back({v0, {uvOffset, x1d4_uvs.yMin}, color});
                    m_cachedVerts.push_back({v1, {uvOffset, x1d4_uvs.yMax}, color});
                    if (uvOffset >= 1.f && particleCount)
                    {
                        CGraphics::DrawArray(drawStart, m_cachedVerts.size() - drawStart);
                        drawStart = m_cachedVerts.size();
                        uvOffset -= 1.f;
                        m_cachedVerts.push_back({v0, {uvOffset, x1d4_uvs.yMin}, color});
                        m_cachedVerts.push_back({v1, {uvOffset, x1d4_uvs.yMax}, color});
                    }

                    if (x1ec_TSPN > 0)
                        uvOffset += x1e8_uvSpan;
                    else
                        uvOffset = i * x1e8_uvSpan;
                }
            }
        }
    }
    else
    {
        for (int i=0 ; i<x15c_swooshes.size() ; ++i)
        {
            SSwooshData& swoosh = x15c_swooshes[curIdx];

            curIdx -= 1;
            if (curIdx < 0)
                curIdx = x15c_swooshes.size() - 1;

            if (swoosh.x0_active)
            {
                float ang = zeus::degToRad(swoosh.x30_irot + swoosh.x34_rotm);
                if (std::fabs(ang) > M_PIF)
                {
                    ang -= std::floor(ang / (2.f * M_PIF)) * 2.f * M_PIF;
                    if (ang > M_PIF)
                        ang -= 2.f * M_PIF;
                    else if (ang < -M_PIF)
                        ang += 2.f * M_PIF;
                }

                float sinAng = std::sin(ang);
                float cosAng = std::cos(ang);

                zeus::CVector3f useOffset = swoosh.xc_translation + swoosh.x24_useOffset;
                zeus::CVector3f v0 = swoosh.x38_orientation *
                    zeus::CVector3f(cosAng * swoosh.x4_leftRad, 0.f, sinAng * swoosh.x4_leftRad) + useOffset;
                zeus::CVector3f v1 = swoosh.x38_orientation *
                    zeus::CVector3f(-cosAng * swoosh.x8_rightRad, 0.f, -sinAng * swoosh.x8_rightRad) + useOffset;

                zeus::CColor color = swoosh.x6c_color * x20c_moduColor;
                m_cachedVerts.push_back({v0, {}, color});
                m_cachedVerts.push_back({v1, {}, color});
            }
        }
    }

    CGraphics::DrawArray(drawStart, m_cachedVerts.size() - drawStart);
}

void CParticleSwoosh::Render(const CActorLights*)
{
    if (x1b4_LENG < 2 || x1ac_particleCount <= 1)
        return;

    m_cachedVerts.clear();
    if (m_dataBind)
        CGraphics::SetShaderDataBinding(m_dataBind);

    CParticleGlobals::SetParticleLifetime(x1b4_LENG);
    CGlobalRandom gr(x1c0_rand);
    CGraphics::DisableAllLights();
    // Z-test, Z-update if x45_24_ZBUF
    // Additive if x1d0_25_AALP, otherwise alpha blend

    CGraphics::SetModelMatrix(
        zeus::CTransform::Translate(xa4_globalTranslation) * xb0_globalOrientation *
        xec_scaleXf * zeus::CTransform::Scale(x14c_localScale));

    // Disable face culling

    if (CUVElement* texr = x1c_desc->x3c_TEXR.get())
    {
        TLockedToken<CTexture> tex = texr->GetValueTexture(x28_curFrame);
        // Load tex
        x1e4_tex = tex.GetObj();

        texr->GetValueUV(x28_curFrame, x1d4_uvs);

        x1d0_31_constantTex = texr->HasConstantTexture();
        x1d1_24_constantUv = texr->HasConstantUV();

        if (CIntElement* tspn = x1c_desc->x40_TSPN.get())
            tspn->GetValue(x28_curFrame, x1ec_TSPN);

        if (x1ec_TSPN <= 0)
            x1ec_TSPN = x15c_swooshes.size() - 1;

        x1e8_uvSpan = 1.f;
        if (x1ec_TSPN > 0)
            x1e8_uvSpan = 1.f / float(x1ec_TSPN);

        // TEV0 modulate
    }
    else
    {
        // TEV0 passthru
    }

    // TEV1 passthru

    if (x1b8_SIDE == 2)
    {
        if (x1b0_SPLN <= 0)
        {
            if (x1d0_27_renderGaps)
                Render2SidedNoSplineGaps();
            else
                Render2SidedNoSplineNoGaps();
        }
        else
        {
            Render2SidedSpline();
        }
    }
    else if (x1b8_SIDE == 3)
    {
        if (x1b0_SPLN > 0)
            Render3SidedSolidSpline();
        else
            Render3SidedSolidNoSplineNoGaps();
    }
    else
    {
        if (x1b0_SPLN > 0)
            RenderNSidedSpline();
        else
            RenderNSidedNoSpline();
    }

    zeus::CMatrix4f mvp = CGraphics::GetPerspectiveProjectionMatrix(true) * CGraphics::g_GXModelView.toMatrix4f();
    m_uniformBuf->load(&mvp, sizeof(zeus::CMatrix4f));
    if (m_cachedVerts.size())
        m_vertBuf->load(m_cachedVerts.data(), m_cachedVerts.size() * sizeof(CParticleSwooshShaders::Vert));
}

void CParticleSwoosh::SetOrientation(const zeus::CTransform& xf)
{
    x44_orientation = xf;
    x74_invOrientation = xf.inverse();
    x15c_swooshes[x158_curParticle].x38_orientation = xf;
}

void CParticleSwoosh::SetTranslation(const zeus::CVector3f& translation)
{
    x38_translation = translation;
    UpdateSwooshTranslation(x38_translation);
}

void CParticleSwoosh::SetGlobalOrientation(const zeus::CTransform& xf)
{
    xb0_globalOrientation = xf.getRotation();
}

void CParticleSwoosh::SetGlobalTranslation(const zeus::CVector3f& translation)
{
    xa4_globalTranslation = translation;
}

void CParticleSwoosh::SetGlobalScale(const zeus::CVector3f& scale)
{
    xe0_globalScale = scale;
    xec_scaleXf = zeus::CTransform::Scale(scale);
    x11c_invScaleXf = zeus::CTransform::Scale(1.f / scale);
}

void CParticleSwoosh::SetLocalScale(const zeus::CVector3f& scale)
{
    x14c_localScale = scale;
}

void CParticleSwoosh::SetParticleEmission(bool e)
{
    x1d0_24_emitting = e;
}

void CParticleSwoosh::SetModulationColor(const zeus::CColor& color)
{
    x20c_moduColor = color;
}

const zeus::CTransform& CParticleSwoosh::GetOrientation() const
{
    return x44_orientation;
}

const zeus::CVector3f& CParticleSwoosh::GetTranslation() const
{
    return x38_translation;
}

const zeus::CTransform& CParticleSwoosh::GetGlobalOrientation() const
{
    return xb0_globalOrientation;
}

const zeus::CVector3f& CParticleSwoosh::GetGlobalTranslation() const
{
    return xa4_globalTranslation;
}

const zeus::CVector3f& CParticleSwoosh::GetGlobalScale() const
{
    return xe0_globalScale;
}

const zeus::CColor& CParticleSwoosh::GetModulationColor() const
{
    return x20c_moduColor;
}

bool CParticleSwoosh::IsSystemDeletable() const
{
    if (x1d0_24_emitting && x28_curFrame < x2c_PSLT)
        return false;

    if (GetParticleCount() >= 2)
        return false;

    return true;
}

std::experimental::optional<zeus::CAABox> CParticleSwoosh::GetBounds() const
{
    if (GetParticleCount() <= 1)
    {
        zeus::CVector3f trans = x38_translation + xa4_globalTranslation;
        return zeus::CAABox(trans, trans);
    }
    else
    {
        zeus::CTransform xf = zeus::CTransform::Translate(xa4_globalTranslation) *
            xb0_globalOrientation * xec_scaleXf;
        return zeus::CAABox(x1f0_aabbMin - x208_maxRadius, x1fc_aabbMax + x208_maxRadius).getTransformedAABox(xf);
    }
}

u32 CParticleSwoosh::GetParticleCount() const
{
    return x1ac_particleCount;
}

bool CParticleSwoosh::SystemHasLight() const
{
    return false;
}

CLight CParticleSwoosh::GetLight() const
{
    return CLight::BuildLocalAmbient(zeus::CVector3f::skZero, zeus::CColor::skWhite);
}

bool CParticleSwoosh::GetParticleEmission() const
{
    return x1d0_24_emitting;
}

void CParticleSwoosh::DestroyParticles()
{
    // Empty
}

}