metaforce/Runtime/Camera/CFirstPersonCamera.cpp

#include "CFirstPersonCamera.hpp"
#include "GameGlobalObjects.hpp"
#include "CStateManager.hpp"
#include "World/CPlayer.hpp"
#include "World/CScriptGrapplePoint.hpp"
#include "World/CScriptCameraPitchVolume.hpp"
#include "TCastTo.hpp"

namespace urde
{

CFirstPersonCamera::CFirstPersonCamera(TUniqueId uid, const zeus::CTransform& xf, TUniqueId watchedObj,
                                       float orbitCameraSpeed, float fov, float nearz, float farz, float aspect)
: CGameCamera(uid, true, "First Person Camera", CEntityInfo(kInvalidAreaId, CEntity::NullConnectionList), xf, fov,
              nearz, farz, aspect, watchedObj, false, 0), x188_orbitCameraSpeed(orbitCameraSpeed),
  x190_gunFollowXf(xf)
{
    x1c6_24_deferBallTransitionProcessing = false;
}

void CFirstPersonCamera::Accept(IVisitor& visitor)
{
    visitor.Visit(this);
}

void CFirstPersonCamera::PreThink(float dt, CStateManager& mgr)
{
    // Empty
}

void CFirstPersonCamera::Think(float dt, CStateManager& mgr)
{
    if (TCastToPtr<CPlayer> player = mgr.ObjectById(xe8_watchedObject))
    {
        if (!x1c6_24_deferBallTransitionProcessing)
        {
            if (player->GetMorphballTransitionState() == CPlayer::EPlayerMorphBallState::Morphed)
            {
                if (player->GetCameraState() != CPlayer::EPlayerCameraState::Spawned)
                    return;
                SetTransform(player->CreateTransformFromMovementDirection());
                SetTranslation(player->GetEyePosition());
                return;
            }
            if (player->GetMorphballTransitionState() != CPlayer::EPlayerMorphBallState::Unmorphed)
            {
                if (player->GetMorphballTransitionState() != CPlayer::EPlayerMorphBallState::Unmorphing)
                    return;
                float morphFactor = 0.f;
                if (player->GetMorphDuration() != 0.f)
                    morphFactor = zeus::clamp(0.f, player->GetMorphTime() / player->GetMorphDuration(), 1.f);
                if (std::fabs(morphFactor - 1.f) >= 0.00001f)
                    return;
            }
        }
        else
        {
            x1c6_24_deferBallTransitionProcessing = false;
        }
        zeus::CTransform backupXf = x34_transform;
        UpdateElevation(mgr);
        UpdateTransform(mgr, dt);
        SetTransform(ValidateCameraTransform(x34_transform, backupXf));
        if (x1d4_closeInTimer > 0.f)
            x1d4_closeInTimer -= dt;
    }
}

void CFirstPersonCamera::ProcessInput(const CFinalInput&, CStateManager& mgr)
{
    // Empty
}

void CFirstPersonCamera::Reset(const zeus::CTransform& xf, CStateManager& mgr)
{
    SetTransform(xf);
    SetTranslation(mgr.GetPlayer().GetEyePosition());
    x190_gunFollowXf = x34_transform;
}

void CFirstPersonCamera::SkipCinematic()
{
    x1c8_closeInVec = zeus::CVector3f::skZero;
    x1d4_closeInTimer = 0.f;
}

void CFirstPersonCamera::CalculateGunFollowOrientationAndTransform(zeus::CTransform& gunXf, zeus::CQuaternion& gunQ,
                                                                   float dt, zeus::CVector3f& rVec)
{
    zeus::CVector3f gunFrontVec = x190_gunFollowXf.frontVector();
    gunFrontVec.z = 0.f;

    if (gunFrontVec.canBeNormalized())
        gunFrontVec.normalize();

    zeus::CVector3f rVecNoZ = rVec;
    rVecNoZ.z = 0.f;
    if (rVecNoZ.canBeNormalized())
        rVecNoZ.normalize();

    gunXf = zeus::CQuaternion::lookAt(rVecNoZ, gunFrontVec, zeus::CRelAngle::FromDegrees(360.f)).toTransform() *
            gunXf.getRotation();

    zeus::CVector3f newgunFront = gunXf.frontVector();

    if (newgunFront.canBeNormalized())
        newgunFront.normalize();

    float angle = newgunFront.dot(rVec);
    if (std::fabs(angle) > 0.f)
        angle = (angle > -0.f ? -1.f : 1.f);
    gunQ = zeus::CQuaternion::lookAt(rVec, newgunFront, zeus::clamp(0.f, std::acos(angle) / dt, 1.f));
}

void CFirstPersonCamera::UpdateTransform(CStateManager& mgr, float dt)
{
    TCastToPtr<CPlayer> player(mgr.ObjectById(GetWatchedObject()));
    if (!player)
    {
        SetTransform(zeus::CTransform::Identity());
        return;
    }

    zeus::CTransform playerXf = player->GetTransform();
    zeus::CVector3f rVec =
        playerXf.rotate({0.f, std::min(std::fabs(std::cos(x1c0_pitch)), 1.0f), std::min(std::fabs(std::sin(x1c0_pitch)), 1.0f)});
    if (player->x3dc_inFreeLook)
    {
        float angle = player->x3ec_freeLookPitchAngle;
        float angleClamp = g_tweakPlayer->GetVerticalFreeLookAngleVel() - std::fabs(x1c0_pitch);
        angle = zeus::clamp(-angleClamp, angle, angleClamp);
        zeus::CVector3f vec;
        vec.z = std::sin(angle);
        vec.y = std::cos(-player->x3e4_freeLookYawAngle) * std::cos(angle);
        vec.x = std::sin(-player->x3e4_freeLookYawAngle) * std::cos(angle);
        if (g_tweakPlayer->GetFreeLookTurnsPlayer() && !zeus::close_enough(vec, zeus::CVector3f::skZero))
            vec.normalize();

        rVec = zeus::CQuaternion::lookAt({0.f, 1.f, 0.f}, rVec, zeus::CRelAngle::FromDegrees(360.f)).transform(vec);
    }

    zeus::CVector3f eyePos = player->GetEyePosition();
    if (x1d4_closeInTimer > 0.f)
    {
        eyePos += zeus::clamp(0.f, 0.5f * x1d4_closeInTimer, 1.f) * x1c8_closeInVec;
        player->GetCameraBob()->ResetCameraBobTime();
        player->GetCameraBob()->SetCameraBobTransform(zeus::CTransform::Identity());
    }

    if (player->GetOrbitState() == CPlayer::EPlayerOrbitState::ForcedOrbitObject ||
        player->GetOrbitState() == CPlayer::EPlayerOrbitState::OrbitObject)
    {
        const CActor* act = TCastToConstPtr<CActor>(mgr.GetObjectById(player->x310_orbitTargetId));
        if (act && act->GetMaterialList().Intersection(CMaterialList(EMaterialTypes::Lava)) != 0)
        {
            zeus::CVector3f v = player->x314_orbitPoint.y - eyePos;
            if (v.canBeNormalized())
                v.normalize();

            rVec = v;
        }
    }
    else if (player->GetOrbitState() == CPlayer::EPlayerOrbitState::NoOrbit &&
             player->GetMorphballTransitionState() == CPlayer::EPlayerMorphBallState::Unmorphed &&
             !player->x3dc_inFreeLook && x1c4_pitchId == kInvalidUniqueId)
    {
        if (player->x294_jumpCameraTimer > 0.f)
        {
            float angle = zeus::clamp(0.f, (player->x294_jumpCameraTimer - g_tweakPlayer->GetJumpCameraPitchDownStart()) /
                g_tweakPlayer->GetJumpCameraPitchDownFull(), 1.f) *
                g_tweakPlayer->GetJumpCameraPitchDownAngle();
            angle += x1c0_pitch;
            rVec.x = 0.f;
            rVec.y = std::cos(angle);
            rVec.z = -std::sin(angle);

            rVec = playerXf.rotate(rVec);
        }
        else if (player->x29c_fallCameraTimer > 0.f)
        {
            float angle = zeus::clamp(0.f, (player->x29c_fallCameraTimer - g_tweakPlayer->GetFallCameraPitchDownStart()) /
                g_tweakPlayer->GetFallCameraPitchDownFull(), 1.f) *
                g_tweakPlayer->GetFallCameraPitchDownAngle();
            rVec.x = 0.f;
            rVec.y = std::cos(angle);
            rVec.z = -std::sin(angle);

            rVec = playerXf.rotate(rVec);
        }
    }

    if (rVec.canBeNormalized())
        rVec.normalize();

    zeus::CTransform gunXf = x190_gunFollowXf;
    zeus::CQuaternion qGun = zeus::CQuaternion::skNoRotation;

    if (player->x3dc_inFreeLook)
    {
        if (player->GetOrbitState() == CPlayer::EPlayerOrbitState::ForcedOrbitObject ||
            player->GetOrbitState() == CPlayer::EPlayerOrbitState::OrbitObject)
        {
            zeus::CVector3f gunFrontVec = gunXf.frontVector();

            if (gunFrontVec.canBeNormalized())
                gunFrontVec.normalize();

            float scaledDt = (dt * g_tweakPlayer->GetOrbitCameraSpeed());
            float angle = gunFrontVec.dot(rVec);
            angle = zeus::clamp(-1.f, angle, 1.f);
            float clampedAngle = zeus::clamp(0.f, std::acos(angle) / scaledDt, 1.f);
            if (angle > 0.999f && x18c_lockCamera && !player->x374_orbitLockEstablished)
                qGun = zeus::CQuaternion::lookAt(rVec, gunFrontVec, zeus::CRelAngle::FromDegrees(360.f));
            else
                qGun = zeus::CQuaternion::lookAt(rVec, gunFrontVec, scaledDt * clampedAngle);

            const CScriptGrapplePoint* gPoint =
                TCastToConstPtr<CScriptGrapplePoint>(mgr.GetObjectById(player->x310_orbitTargetId));
            if (gPoint && player->x29c_fallCameraTimer > 0.f)
            {
                gunFrontVec = x190_gunFollowXf.frontVector();
                if (gunFrontVec.canBeNormalized())
                    gunFrontVec.normalize();

                zeus::CVector3f rVecCpy = rVec;
                if (rVecCpy.canBeNormalized())
                    rVecCpy.normalize();

                gunXf =
                    zeus::CQuaternion::lookAt(rVecCpy, gunFrontVec, zeus::CRelAngle::FromDegrees(360.f)).toTransform() *
                    x190_gunFollowXf.getRotation();

                gunFrontVec = gunXf.frontVector();
                if (gunFrontVec.canBeNormalized())
                    gunFrontVec.normalize();

                float angle = gunFrontVec.dot(rVec);
                float sdt = dt * g_tweakPlayer->GetGrappleCameraSpeed();

                angle = zeus::clamp(-1.f, angle, 1.f);
                angle = zeus::clamp(0.f, std::acos(angle) / sdt, 1.f) * sdt;
                qGun = zeus::CQuaternion::lookAt(rVec, gunFrontVec, angle);
            }
        }
        else if (player->GetOrbitState() == CPlayer::EPlayerOrbitState::OrbitPoint ||
                 player->GetOrbitState() == CPlayer::EPlayerOrbitState::OrbitCarcass)
        {
            dt *= g_tweakPlayer->GetOrbitCameraSpeed();
            CalculateGunFollowOrientationAndTransform(gunXf, qGun, dt, rVec);
        }
        else if (player->GetOrbitState() == CPlayer::EPlayerOrbitState::Grapple)
        {
            dt *= g_tweakPlayer->GetGrappleCameraSpeed();
            CalculateGunFollowOrientationAndTransform(gunXf, qGun, dt, rVec);
        }
        else
        {
            dt *= g_tweakPlayer->GetFirstPersonCameraSpeed();
            CalculateGunFollowOrientationAndTransform(gunXf, qGun, dt, rVec);
        }
    }
    else
    {
        zeus::CVector3f gunFront = x190_gunFollowXf.frontVector();
        if (gunFront.canBeNormalized())
            gunFront.normalize();

        zeus::CVector3f rVecCpy = rVec;
        if (rVecCpy.canBeNormalized())
            rVecCpy.normalize();

        gunXf = zeus::CQuaternion::lookAt(rVecCpy, gunFront, zeus::CRelAngle::FromDegrees(360.f)).toTransform() *
                x190_gunFollowXf.getRotation();
        gunFront = gunXf.frontVector();
        if (gunFront.canBeNormalized())
            gunFront.normalize();

        float angle = gunFront.dot(rVec);
        angle = zeus::clamp(-1.f, angle, 1.f);
        float sdt = dt * g_tweakPlayer->GetFreeLookSpeed();
        qGun = zeus::CQuaternion::lookAt(
            rVec, gunFront, sdt * zeus::clamp(0.f, g_tweakPlayer->GetFreeLookDampenFactor() *
                (std::acos(angle) / sdt), 1.f));
    }
    zeus::CTransform bobXf = player->GetCameraBob()->GetCameraBobTransformation();

    if (player->GetMorphballTransitionState() == CPlayer::EPlayerMorphBallState::Morphed ||
        player->GetOrbitState() == CPlayer::EPlayerOrbitState::Grapple ||
        player->GetGrappleState() == CPlayer::EGrappleState::None ||
        mgr.GetGameState() == CStateManager::EGameState::SoftPaused ||
        mgr.GetCameraManager()->IsInCinematicCamera())
    {
        bobXf = zeus::CTransform::Identity();
        player->GetCameraBob()->SetCameraBobTransform(bobXf);
    }

    x190_gunFollowXf = qGun.toTransform() * gunXf;
    SetTransform(x190_gunFollowXf * bobXf.getRotation());

    CActor::SetTranslation(x190_gunFollowXf.origin + player->GetTransform().rotate(bobXf.origin));
    x190_gunFollowXf.orthonormalize();
}

void CFirstPersonCamera::UpdateElevation(CStateManager& mgr)
{
    x1c0_pitch = 0.f;
    if (TCastToConstPtr<CPlayer> player = mgr.GetObjectById(xe8_watchedObject))
    {
        if (x1c4_pitchId != kInvalidUniqueId)
        {
            if (TCastToConstPtr<CScriptCameraPitchVolume> pvol = mgr.GetObjectById(x1c4_pitchId))
            {
                zeus::CVector3f pitchDirFlat = pvol->GetTransform().basis[1];
                pitchDirFlat.z = 0.f;
                if (!pitchDirFlat.canBeNormalized())
                    pitchDirFlat = zeus::CVector3f::skForward;

                zeus::CVector3f playerDirFlat = player->GetTransform().basis[1];
                playerDirFlat.z = 0.f;
                playerDirFlat.normalize();

                float pitchDot = zeus::clamp(-1.f, pitchDirFlat.dot(playerDirFlat), 1.f);
                if (pitchDot < 0.f)
                    x1c0_pitch = pvol->GetDownPitch() * -pitchDot;
                else
                    x1c0_pitch = pvol->GetUpPitch() * -pitchDot;

                zeus::CVector3f pvolToPlayerFlat = player->GetTranslation() - pvol->GetTranslation();
                pvolToPlayerFlat.z = 0.f;
                float pitchMul = 0.f;
                if (pvolToPlayerFlat.canBeNormalized())
                {
                    float pvolPlayerProj =
                        std::fabs(zeus::clamp(-1.f, pvolToPlayerFlat.dot(pitchDirFlat), 1.f)) *
                        pvolToPlayerFlat.magnitude();
                    if (pvolPlayerProj <= pvol->GetMaxInterpolationDistance())
                        pitchMul = 1.f;
                    else
                        pitchMul = 1.f - zeus::clamp(-1.f, (pvolPlayerProj - pvol->GetMaxInterpolationDistance()) /
                            (pvol->GetScale().y - pvol->GetMaxInterpolationDistance()), 1.f);
                }
                x1c0_pitch *= pitchMul;
            }
        }
    }
}
}