Runtime: Use nullptr where applicable

Same behavior, but no magic 0 value.

While we're in the same area, we can do minor cosmetic changes.

Runtime/GuiSys/CRasterFont.cpp

@@ -97,8 +97,10 @@ void CRasterFont::SinglePassDrawString(const CDrawStringOptions& opts, int x, in
       if (opts.x0_direction == ETextDirection::Horizontal) {
         x += glyph->GetLeftPadding();
 
-        if (prevGlyph != 0)
+        if (prevGlyph != nullptr) {
           x += KernLookup(x1c_kerning, prevGlyph->GetKernStart(), *chr);
+        }
+
         int left = 0;
         int top = 0;
 

Runtime/Particle/CFlameWarp.cpp

@@ -5,8 +5,9 @@
 namespace urde {
 
 void CFlameWarp::ModifyParticles(std::vector<CParticle>& particles) {
-  if (x9c_stateMgr == 0 || particles.size() < 9)
+  if (x9c_stateMgr == nullptr || particles.size() < 9) {
     return;
+  }
 
   std::vector<std::pair<float, u8>> vec;
   vec.reserve(particles.size());

Runtime/Weapon/CPlayerGun.cpp

@@ -1785,36 +1785,35 @@ void CPlayerGun::UpdateGunIdle(bool inStrikeCooldown, float camBobT, float dt, C
 void CPlayerGun::Update(float grappleSwingT, float cameraBobT, float dt, CStateManager& mgr) {
   CPlayer& player = mgr.GetPlayer();
   CPlayerState& playerState = *mgr.GetPlayerState();
-  bool isUnmorphed = player.GetMorphballTransitionState() == CPlayer::EPlayerMorphBallState::Unmorphed;
+  const bool isUnmorphed = player.GetMorphballTransitionState() == CPlayer::EPlayerMorphBallState::Unmorphed;
 
-  bool becameFrozen;
-  if (isUnmorphed)
+  bool becameFrozen = false;
+  if (isUnmorphed) {
     becameFrozen = !x834_29_frozen && player.GetFrozenState();
-  else
-    becameFrozen = false;
+  }
 
-  bool becameThawed;
-  if (isUnmorphed)
+  bool becameThawed = false;
+  if (isUnmorphed) {
     becameThawed = x834_29_frozen && !player.GetFrozenState();
-  else
-    becameThawed = false;
+  }
 
   x834_29_frozen = isUnmorphed && player.GetFrozenState();
-  float advDt;
-  if (x834_29_frozen)
+  float advDt = dt;
+  if (x834_29_frozen) {
     advDt = 0.f;
-  else
-    advDt = dt;
+  }
 
-  bool r23 = x678_morph.GetGunState() != CGunMorph::EGunState::OutWipeDone;
-  if (mgr.GetPlayerState()->GetCurrentVisor() == CPlayerState::EPlayerVisor::XRay || r23)
+  const bool r23 = x678_morph.GetGunState() != CGunMorph::EGunState::OutWipeDone;
+  if (mgr.GetPlayerState()->GetCurrentVisor() == CPlayerState::EPlayerVisor::XRay || r23) {
     x6e0_rightHandModel.AdvanceAnimation(advDt, mgr, kInvalidAreaId, true);
-  if (r23 && x734_loadingBeam != 0 && x734_loadingBeam != x72c_currentBeam) {
+  }
+  if (r23 && x734_loadingBeam != nullptr && x734_loadingBeam != x72c_currentBeam) {
     x744_auxWeapon->LoadIdle();
     x734_loadingBeam->Update(advDt, mgr);
   }
-  if (!x744_auxWeapon->IsLoaded())
+  if (!x744_auxWeapon->IsLoaded()) {
     x744_auxWeapon->LoadIdle();
+  }
 
   if (becameFrozen) {
     x72c_currentBeam->EnableSecondaryFx(CGunWeapon::ESecondaryFxType::None);

Runtime/World/CMorphBall.hpp

@@ -233,7 +233,7 @@ public:
   void RenderMorphBallTransitionFlash(const CStateManager&) const;
   void UpdateIceBreakEffect(float dt);
   void RenderIceBreakEffect(const CStateManager& mgr) const;
-  bool IsMorphBallTransitionFlashValid() const { return x19dc_morphBallTransitionFlashGen != 0; }
+  bool IsMorphBallTransitionFlashValid() const { return x19dc_morphBallTransitionFlashGen != nullptr; }
   void RenderDamageEffects(const CStateManager& mgr, const zeus::CTransform& xf) const;
   void UpdateHalfPipeStatus(CStateManager& mgr, float dt);
   bool GetIsInHalfPipeMode() const { return x1df8_24_inHalfPipeMode; }

Runtime/World/CSnakeWeedSwarm.hpp

@@ -80,7 +80,7 @@ private:
   u16 x1d0_sfx1;
   u16 x1d2_sfx2;
   u16 x1d4_sfx3;
-  CSfxHandle x1d8_sfxHandle = 0;
+  CSfxHandle x1d8_sfxHandle;
   TLockedToken<CGenDescription> x1dc_particleGenDesc;
   // TLockedToken<CGenDescription> x1e4_; both assign to x1dc_
   std::unique_ptr<CElementGen> x1ec_particleGen1;

Runtime/World/ScriptLoader.cpp

@@ -1013,15 +1013,18 @@ CEntity* ScriptLoader::LoadBeetle(CStateManager& mgr, CInputStream& in, int prop
 }
 
 CEntity* ScriptLoader::LoadHUDMemo(CStateManager& mgr, CInputStream& in, int propCount, const CEntityInfo& info) {
-  if (propCount != 5 && !EnsurePropertyCount(propCount, 6, "HUDMemo"))
-    return 0;
-  std::string name = mgr.HashInstanceName(in);
-  CHUDMemoParms hParms(in);
-  CScriptHUDMemo::EDisplayType displayType = CScriptHUDMemo::EDisplayType::MessageBox;
-  if (propCount == 6)
+  if (propCount != 5 && !EnsurePropertyCount(propCount, 6, "HUDMemo")) {
+    return nullptr;
+  }
+
+  const std::string name = mgr.HashInstanceName(in);
+  const CHUDMemoParms hParms(in);
+  auto displayType = CScriptHUDMemo::EDisplayType::MessageBox;
+  if (propCount == 6) {
     displayType = CScriptHUDMemo::EDisplayType(in.readUint32Big());
-  CAssetId message = in.readUint32Big();
-  bool active = in.readBool();
+  }
+  const CAssetId message = in.readUint32Big();
+  const bool active = in.readBool();
 
   return new CScriptHUDMemo(mgr.AllocateUniqueId(), name, info, hParms, displayType, message, active);
 }