Merge remote-tracking branch 'dteviot/Rng'

apps/openmw/engine.cpp

@@ -10,6 +10,8 @@
 
 #include <SDL.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/compiler/extensions0.hpp>
 
 #include <components/bsa/resources.hpp>
@@ -191,6 +193,7 @@ OMW::Engine::Engine(Files::ConfigurationManager& configurationManager)
   , mExportFonts(false)
   , mNewGame (false)
 {
+    OEngine::Misc::Rng::init();
     std::srand ( static_cast<unsigned int>(std::time(NULL)) );
     MWClass::registerClasses();
 

apps/openmw/mwclass/creature.cpp

@@ -1,6 +1,8 @@
 
 #include "creature.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/loadcrea.hpp>
 #include <components/esm/creaturestate.hpp>
 
@@ -249,7 +251,7 @@ namespace MWClass
 
         float hitchance = MWMechanics::getHitChance(ptr, victim, ref->mBase->mData.mCombat);
 
-        if((::rand()/(RAND_MAX+1.0)) >= hitchance/100.0f)
+        if(OEngine::Misc::Rng::rollProbability() >= hitchance/100.0f)
         {
             victim.getClass().onHit(victim, 0.0f, false, MWWorld::Ptr(), ptr, false);
             MWMechanics::reduceWeaponCondition(0.f, false, weapon, ptr);
@@ -375,8 +377,7 @@ namespace MWClass
                 float agilityTerm = getCreatureStats(ptr).getAttribute(ESM::Attribute::Agility).getModified() * getGmst().fKnockDownMult->getFloat();
                 float knockdownTerm = getCreatureStats(ptr).getAttribute(ESM::Attribute::Agility).getModified()
                         * getGmst().iKnockDownOddsMult->getInt() * 0.01f + getGmst().iKnockDownOddsBase->getInt();
-                int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-                if (ishealth && agilityTerm <= damage && knockdownTerm <= roll)
+                if (ishealth && agilityTerm <= damage && knockdownTerm <= OEngine::Misc::Rng::roll0to99())
                 {
                     getCreatureStats(ptr).setKnockedDown(true);
 
@@ -680,7 +681,7 @@ namespace MWClass
                 ++sound;
             }
             if(!sounds.empty())
-                return sounds[(int)(rand()/(RAND_MAX+1.0)*sounds.size())]->mSound;
+                return sounds[OEngine::Misc::Rng::rollDice(sounds.size())]->mSound;
         }
 
         if (type == ESM::SoundGenerator::Land)

apps/openmw/mwclass/npc.cpp

@@ -5,6 +5,8 @@
 
 #include <OgreSceneNode.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/loadmgef.hpp>
 #include <components/esm/loadnpc.hpp>
 #include <components/esm/npcstate.hpp>
@@ -513,7 +515,7 @@ namespace MWClass
 
         float hitchance = MWMechanics::getHitChance(ptr, victim, ptr.getClass().getSkill(ptr, weapskill));
 
-        if((::rand()/(RAND_MAX+1.0)) >= hitchance/100.0f)
+        if (OEngine::Misc::Rng::rollProbability() >= hitchance / 100.0f)
         {
             othercls.onHit(victim, 0.0f, false, weapon, ptr, false);
             MWMechanics::reduceWeaponCondition(0.f, false, weapon, ptr);
@@ -643,8 +645,7 @@ namespace MWClass
             const GMST& gmst = getGmst();
 
             int chance = store.get<ESM::GameSetting>().find("iVoiceHitOdds")->getInt();
-            int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-            if (roll < chance)
+            if (OEngine::Misc::Rng::roll0to99() < chance)
             {
                 MWBase::Environment::get().getDialogueManager()->say(ptr, "hit");
             }
@@ -653,8 +654,7 @@ namespace MWClass
             float agilityTerm = getCreatureStats(ptr).getAttribute(ESM::Attribute::Agility).getModified() * gmst.fKnockDownMult->getFloat();
             float knockdownTerm = getCreatureStats(ptr).getAttribute(ESM::Attribute::Agility).getModified()
                     * gmst.iKnockDownOddsMult->getInt() * 0.01f + gmst.iKnockDownOddsBase->getInt();
-            roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-            if (ishealth && agilityTerm <= damage && knockdownTerm <= roll)
+            if (ishealth && agilityTerm <= damage && knockdownTerm <= OEngine::Misc::Rng::roll0to99())
             {
                 getCreatureStats(ptr).setKnockedDown(true);
 
@@ -680,7 +680,7 @@ namespace MWClass
                     MWWorld::InventoryStore::Slot_RightPauldron, MWWorld::InventoryStore::Slot_RightPauldron,
                     MWWorld::InventoryStore::Slot_LeftGauntlet, MWWorld::InventoryStore::Slot_RightGauntlet
                 };
-                int hitslot = hitslots[(int)(::rand()/(RAND_MAX+1.0)*20.0)];
+                int hitslot = hitslots[OEngine::Misc::Rng::rollDice(20)];
 
                 float unmitigatedDamage = damage;
                 float x = damage / (damage + getArmorRating(ptr));

apps/openmw/mwgui/jailscreen.cpp

@@ -1,5 +1,7 @@
 #include <MyGUI_ScrollBar.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwbase/windowmanager.hpp"
 #include "../mwbase/mechanicsmanager.hpp"
 #include "../mwbase/world.hpp"
@@ -83,7 +85,7 @@ namespace MWGui
         std::set<int> skills;
         for (int day=0; day<mDays; ++day)
         {
-            int skill = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * ESM::Skill::Length);
+            int skill = OEngine::Misc::Rng::rollDice(ESM::Skill::Length);
             skills.insert(skill);
 
             MWMechanics::SkillValue& value = player.getClass().getNpcStats(player).getSkill(skill);

apps/openmw/mwgui/loadingscreen.cpp

@@ -15,6 +15,8 @@
 #include <MyGUI_Gui.h>
 #include <MyGUI_TextBox.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/settings/settings.hpp>
 
 #include "../mwbase/environment.hpp"
@@ -146,7 +148,7 @@ namespace MWGui
 
         if (!mResources.empty())
         {
-            std::string const & randomSplash = mResources.at (rand() % mResources.size());
+            std::string const & randomSplash = mResources.at(OEngine::Misc::Rng::rollDice(mResources.size()));
 
             Ogre::TextureManager::getSingleton ().load (randomSplash, Ogre::ResourceGroupManager::AUTODETECT_RESOURCE_GROUP_NAME);
 

apps/openmw/mwgui/pickpocketitemmodel.cpp

@@ -1,5 +1,7 @@
 #include "pickpocketitemmodel.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwmechanics/npcstats.hpp"
 #include "../mwworld/class.hpp"
 
@@ -12,11 +14,13 @@ namespace MWGui
         int chance = thief.getClass().getSkill(thief, ESM::Skill::Sneak);
 
         mSourceModel->update();
+
+        // build list of items that player is unable to find when attempts to pickpocket.
         if (hideItems)
         {
             for (size_t i = 0; i<mSourceModel->getItemCount(); ++i)
             {
-                if (std::rand() / static_cast<float>(RAND_MAX) * 100 > chance)
+                if (chance <= OEngine::Misc::Rng::roll0to99())
                     mHiddenItems.push_back(mSourceModel->getItem(i));
             }
         }

apps/openmw/mwgui/recharge.cpp

@@ -5,6 +5,8 @@
 #include <MyGUI_ScrollView.h>
 #include <MyGUI_Gui.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/records.hpp>
 
 #include "../mwbase/world.hpp"
@@ -161,7 +163,7 @@ void Recharge::onItemClicked(MyGUI::Widget *sender)
         intelligenceTerm = 1;
 
     float x = (npcStats.getSkill(ESM::Skill::Enchant).getModified() + intelligenceTerm + luckTerm) * stats.getFatigueTerm();
-    int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
+    int roll = OEngine::Misc::Rng::roll0to99();
     if (roll < x)
     {
         std::string soul = gem.getCellRef().getSoul();

apps/openmw/mwgui/tradewindow.cpp

@@ -4,6 +4,8 @@
 #include <MyGUI_InputManager.h>
 #include <MyGUI_ControllerManager.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/widgets/numericeditbox.hpp>
 
 #include "../mwbase/environment.hpp"
@@ -365,7 +367,7 @@ namespace MWGui
             else
                 x += abs(int(npcTerm - pcTerm));
 
-            int roll = std::rand()%100 + 1;
+            int roll = OEngine::Misc::Rng::rollDice(100) + 1;
             if(roll > x || (mCurrentMerchantOffer < 0) != (mCurrentBalance < 0)) //trade refused
             {
                 MWBase::Environment::get().getWindowManager()->

apps/openmw/mwgui/waitdialog.cpp

@@ -2,6 +2,8 @@
 
 #include <MyGUI_ProgressBar.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/widgets/box.hpp>
 #include <components/settings/settings.hpp>
 
@@ -152,10 +154,9 @@ namespace MWGui
                 const ESM::Region *region = world->getStore().get<ESM::Region>().find (regionstr);
                 if (!region->mSleepList.empty())
                 {
+                    // figure out if player will be woken while sleeping
                     float fSleepRandMod = world->getStore().get<ESM::GameSetting>().find("fSleepRandMod")->getFloat();
-                    int x = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * hoursToWait); // [0, hoursRested]
-                    float y = fSleepRandMod * hoursToWait;
-                    if (x > y)
+                    if (OEngine::Misc::Rng::rollProbability() > fSleepRandMod)
                     {
                         float fSleepRestMod = world->getStore().get<ESM::GameSetting>().find("fSleepRestMod")->getFloat();
                         mInterruptAt = hoursToWait - int(fSleepRestMod * hoursToWait);

apps/openmw/mwmechanics/activespells.cpp

@@ -1,5 +1,7 @@
 #include "activespells.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/misc/stringops.hpp>
 
 #include <components/esm/loadmgef.hpp>
@@ -229,8 +231,7 @@ namespace MWMechanics
     {
         for (TContainer::iterator it = mSpells.begin(); it != mSpells.end(); )
         {
-            int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-            if (roll < chance)
+            if (OEngine::Misc::Rng::roll0to99() < chance)
                 mSpells.erase(it++);
             else
                 ++it;

apps/openmw/mwmechanics/aicombat.cpp

@@ -2,6 +2,8 @@
 
 #include <OgreMath.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/aisequence.hpp>
 
 #include "../mwworld/class.hpp"
@@ -393,7 +395,7 @@ namespace MWMechanics
                 if (!distantCombat) attackType = chooseBestAttack(weapon, movement);
                 else attackType = ESM::Weapon::AT_Chop; // cause it's =0
 
-                strength = static_cast<float>(rand()) / RAND_MAX;
+                strength = OEngine::Misc::Rng::rollClosedProbability();
 
                 // Note: may be 0 for some animations
                 timerAttack = minMaxAttackDuration[attackType][0] + 
@@ -404,8 +406,7 @@ namespace MWMechanics
                 {
                     const MWWorld::ESMStore &store = world->getStore();
                     int chance = store.get<ESM::GameSetting>().find("iVoiceAttackOdds")->getInt();
-                    int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-                    if (roll < chance)
+                    if (OEngine::Misc::Rng::roll0to99() < chance)
                     {
                         MWBase::Environment::get().getDialogueManager()->say(actor, "attack");
                     }
@@ -512,17 +513,17 @@ namespace MWMechanics
             {
                 if(movement.mPosition[0] || movement.mPosition[1])
                 {
-                    timerCombatMove = 0.1f + 0.1f * static_cast<float>(rand())/RAND_MAX;
+                    timerCombatMove = 0.1f + 0.1f * OEngine::Misc::Rng::rollClosedProbability();
                     combatMove = true;
                 }
                 // only NPCs are smart enough to use dodge movements
                 else if(actorClass.isNpc() && (!distantCombat || (distantCombat && distToTarget < rangeAttack/2)))
                 {
                     //apply sideway movement (kind of dodging) with some probability
-                    if(static_cast<float>(rand())/RAND_MAX < 0.25)
+                    if (OEngine::Misc::Rng::rollClosedProbability() < 0.25)
                     {
-                        movement.mPosition[0] = static_cast<float>(rand())/RAND_MAX < 0.5? 1.0f : -1.0f;
-                        timerCombatMove = 0.05f + 0.15f * static_cast<float>(rand())/RAND_MAX;
+                        movement.mPosition[0] = OEngine::Misc::Rng::rollProbability() < 0.5 ? 1.0f : -1.0f;
+                        timerCombatMove = 0.05f + 0.15f * OEngine::Misc::Rng::rollClosedProbability();
                         combatMove = true;
                     }
                 }
@@ -637,7 +638,7 @@ namespace MWMechanics
                 float s2 = speed2 * t;
                 float t_swing = 
                     minMaxAttackDuration[ESM::Weapon::AT_Thrust][0] + 
-                    (minMaxAttackDuration[ESM::Weapon::AT_Thrust][1] - minMaxAttackDuration[ESM::Weapon::AT_Thrust][0]) * static_cast<float>(rand()) / RAND_MAX;
+                    (minMaxAttackDuration[ESM::Weapon::AT_Thrust][1] - minMaxAttackDuration[ESM::Weapon::AT_Thrust][0]) * OEngine::Misc::Rng::rollClosedProbability();
 
                 if (t + s2/speed1 <= t_swing)
                 {
@@ -761,10 +762,10 @@ ESM::Weapon::AttackType chooseBestAttack(const ESM::Weapon* weapon, MWMechanics:
     if (weapon == NULL)
     {
         //hand-to-hand deal equal damage for each type
-        float roll = static_cast<float>(rand())/RAND_MAX;
+        float roll = OEngine::Misc::Rng::rollClosedProbability();
         if(roll <= 0.333f)  //side punch
         {
-            movement.mPosition[0] = (static_cast<float>(rand())/RAND_MAX < 0.5f)? 1.0f : -1.0f;
+            movement.mPosition[0] = OEngine::Misc::Rng::rollClosedProbability() ? 1.0f : -1.0f;
             movement.mPosition[1] = 0;
             attackType = ESM::Weapon::AT_Slash;
         }
@@ -788,10 +789,10 @@ ESM::Weapon::AttackType chooseBestAttack(const ESM::Weapon* weapon, MWMechanics:
 
         float total = static_cast<float>(slash + chop + thrust);
 
-        float roll = static_cast<float>(rand())/RAND_MAX;
+        float roll = OEngine::Misc::Rng::rollClosedProbability();
         if(roll <= (slash/total))
         {
-            movement.mPosition[0] = (static_cast<float>(rand())/RAND_MAX < 0.5f)? 1.0f : -1.0f;
+            movement.mPosition[0] = (OEngine::Misc::Rng::rollClosedProbability() < 0.5f) ? 1.0f : -1.0f;
             movement.mPosition[1] = 0;
             attackType = ESM::Weapon::AT_Slash;
         }

apps/openmw/mwmechanics/aiwander.cpp

@@ -3,6 +3,8 @@
 #include <OgreVector3.h>
 #include <OgreSceneNode.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/aisequence.hpp>
 
 #include "../mwbase/world.hpp"
@@ -315,7 +317,7 @@ namespace MWMechanics
             static float fVoiceIdleOdds = MWBase::Environment::get().getWorld()->getStore()
                     .get<ESM::GameSetting>().find("fVoiceIdleOdds")->getFloat();
 
-            float roll = std::rand()/ (static_cast<float> (RAND_MAX) + 1) * 10000;
+            float roll = OEngine::Misc::Rng::rollProbability() * 10000.0f;
 
             // In vanilla MW the chance was FPS dependent, and did not allow proper changing of fVoiceIdleOdds
             // due to the roll being an integer.
@@ -490,7 +492,7 @@ namespace MWMechanics
             if(!storage.mPathFinder.isPathConstructed())
             {
                 assert(mAllowedNodes.size());
-                unsigned int randNode = (int)(rand() / ((double)RAND_MAX + 1) * mAllowedNodes.size());
+                unsigned int randNode = OEngine::Misc::Rng::rollDice(mAllowedNodes.size());
                 // NOTE: initially constructed with local (i.e. cell) co-ordinates
                 Ogre::Vector3 destNodePos(PathFinder::MakeOgreVector3(mAllowedNodes[randNode]));
 
@@ -637,7 +639,7 @@ namespace MWMechanics
                 .get<ESM::GameSetting>().find("fIdleChanceMultiplier")->getFloat();
 
             unsigned short idleChance = static_cast<unsigned short>(fIdleChanceMultiplier * mIdle[counter]);
-            unsigned short randSelect = (int)(rand() / ((double)RAND_MAX + 1) * int(100 / fIdleChanceMultiplier));
+            unsigned short randSelect = (int)(OEngine::Misc::Rng::rollProbability() * int(100 / fIdleChanceMultiplier));
             if(randSelect < idleChance && randSelect > idleRoll)
             {
                 playedIdle = counter+2;
@@ -659,7 +661,7 @@ namespace MWMechanics
 
         state.moveIn(new AiWanderStorage());
 
-        int index = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * mAllowedNodes.size());
+        int index = OEngine::Misc::Rng::rollDice(mAllowedNodes.size());
         ESM::Pathgrid::Point dest = mAllowedNodes[index];
 
         // apply a slight offset to prevent overcrowding

apps/openmw/mwmechanics/alchemy.cpp

@@ -8,6 +8,8 @@
 #include <stdexcept>
 #include <map>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/loadskil.hpp>
 #include <components/esm/loadappa.hpp>
 #include <components/esm/loadgmst.hpp>
@@ -294,7 +296,7 @@ void MWMechanics::Alchemy::addPotion (const std::string& name)
 
     newRecord.mName = name;
 
-    int index = static_cast<int> (std::rand()/(static_cast<double> (RAND_MAX)+1)*6);
+    int index = OEngine::Misc::Rng::rollDice(6);
     assert (index>=0 && index<6);
 
     static const char *meshes[] = { "standard", "bargain", "cheap", "fresh", "exclusive", "quality" };
@@ -467,7 +469,7 @@ MWMechanics::Alchemy::Result MWMechanics::Alchemy::create (const std::string& na
         return Result_RandomFailure;
     }
 
-    if (getAlchemyFactor()<std::rand()/static_cast<double> (RAND_MAX)*100)
+    if (getAlchemyFactor() < OEngine::Misc::Rng::roll0to99())
     {
         removeIngredients();
         return Result_RandomFailure;

apps/openmw/mwmechanics/character.cpp

@@ -27,6 +27,8 @@
 #include "creaturestats.hpp"
 #include "security.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/settings/settings.hpp>
 
 #include "../mwrender/animation.hpp"
@@ -220,7 +222,7 @@ std::string CharacterController::chooseRandomGroup (const std::string& prefix, i
     while (mAnimation->hasAnimation(prefix + Ogre::StringConverter::toString(numAnims+1)))
         ++numAnims;
 
-    int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * numAnims) + 1; // [1, numAnims]
+    int roll = OEngine::Misc::Rng::rollDice(numAnims) + 1; // [1, numAnims]
     if (num)
         *num = roll;
     return prefix + Ogre::StringConverter::toString(roll);
@@ -829,7 +831,7 @@ bool CharacterController::updateCreatureState()
             }
             if (weapType != WeapType_Spell || !mAnimation->hasAnimation("spellcast")) // Not all creatures have a dedicated spellcast animation
             {
-                int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 3); // [0, 2]
+                int roll = OEngine::Misc::Rng::rollDice(3); // [0, 2]
                 if (roll == 0)
                     mCurrentWeapon = "attack1";
                 else if (roll == 1)
@@ -1125,7 +1127,7 @@ bool CharacterController::updateWeaponState()
                 // most creatures don't actually have an attack wind-up animation, so use a uniform random value
                 // (even some creatures that can use weapons don't have a wind-up animation either, e.g. Rieklings)
                 // Note: vanilla MW uses a random value for *all* non-player actors, but we probably don't need to go that far.
-                attackStrength = std::min(1.f, 0.1f + std::rand() / float(RAND_MAX));
+                attackStrength = std::min(1.f, 0.1f + OEngine::Misc::Rng::rollClosedProbability());
             }
 
             if(mWeaponType != WeapType_Crossbow && mWeaponType != WeapType_BowAndArrow)

apps/openmw/mwmechanics/combat.cpp

@@ -2,6 +2,8 @@
 
 #include <OgreSceneNode.h>
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwbase/environment.hpp"
 #include "../mwbase/world.hpp"
 #include "../mwbase/mechanicsmanager.hpp"
@@ -107,8 +109,7 @@ namespace MWMechanics
         int iBlockMinChance = gmst.find("iBlockMinChance")->getInt();
         x = std::min(iBlockMaxChance, std::max(iBlockMinChance, x));
 
-        int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-        if (roll < x)
+        if (OEngine::Misc::Rng::roll0to99() < x)
         {
             // Reduce shield durability by incoming damage
             int shieldhealth = shield->getClass().getItemHealth(*shield);
@@ -186,7 +187,7 @@ namespace MWMechanics
         int skillValue = attacker.getClass().getSkill(attacker,
                                            weapon.getClass().getEquipmentSkill(weapon));
 
-        if((::rand()/(RAND_MAX+1.0)) >= getHitChance(attacker, victim, skillValue)/100.0f)
+        if (OEngine::Misc::Rng::rollProbability() >= getHitChance(attacker, victim, skillValue) / 100.0f)
         {
             victim.getClass().onHit(victim, 0.0f, false, projectile, attacker, false);
             MWMechanics::reduceWeaponCondition(0.f, false, weapon, attacker);
@@ -224,7 +225,7 @@ namespace MWMechanics
                 && !appliedEnchantment)
         {
             float fProjectileThrownStoreChance = gmst.find("fProjectileThrownStoreChance")->getFloat();
-            if ((::rand()/(RAND_MAX+1.0)) < fProjectileThrownStoreChance/100.f)
+            if (OEngine::Misc::Rng::rollProbability() < fProjectileThrownStoreChance / 100.f)
                 victim.getClass().getContainerStore(victim).add(projectile, 1, victim);
         }
 
@@ -291,8 +292,7 @@ namespace MWMechanics
 
             saveTerm *= 1.25f * normalisedFatigue;
 
-            float roll = std::rand()/ (static_cast<float> (RAND_MAX) + 1) * 100; // [0, 99]
-            float x = std::max(0.f, saveTerm - roll);
+            float x = std::max(0.f, saveTerm - OEngine::Misc::Rng::roll0to99());
 
             int element = ESM::MagicEffect::FireDamage;
             if (i == 1)

apps/openmw/mwmechanics/disease.hpp

@@ -1,6 +1,8 @@
 #ifndef OPENMW_MECHANICS_DISEASE_H
 #define OPENMW_MECHANICS_DISEASE_H
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwbase/windowmanager.hpp"
 #include "../mwbase/environment.hpp"
 #include "../mwbase/world.hpp"
@@ -49,9 +51,7 @@ namespace MWMechanics
                 continue;
 
             int x = static_cast<int>(fDiseaseXferChance * 100 * resist);
-            float roll = static_cast<float>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 10000); // [0, 9999]
-
-            if (roll < x)
+            if (OEngine::Misc::Rng::rollDice(10000) < x)
             {
                 // Contracted disease!
                 actor.getClass().getCreatureStats(actor).getSpells().add(it->first);

apps/openmw/mwmechanics/enchanting.cpp

@@ -1,4 +1,7 @@
 #include "enchanting.hpp"
+
+#include <openengine/misc/rng.hpp>
+
 #include "../mwworld/manualref.hpp"
 #include "../mwworld/class.hpp"
 #include "../mwworld/containerstore.hpp"
@@ -67,7 +70,7 @@ namespace MWMechanics
 
         if(mSelfEnchanting)
         {
-            if(getEnchantChance()<std::rand()/static_cast<double> (RAND_MAX)*100)
+            if(getEnchantChance() <= (OEngine::Misc::Rng::roll0to99()))
                 return false;
 
             mEnchanter.getClass().skillUsageSucceeded (mEnchanter, ESM::Skill::Enchant, 2);

apps/openmw/mwmechanics/levelledlist.hpp

@@ -1,6 +1,8 @@
 #ifndef OPENMW_MECHANICS_LEVELLEDLIST_H
 #define OPENMW_MECHANICS_LEVELLEDLIST_H
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwworld/ptr.hpp"
 #include "../mwworld/esmstore.hpp"
 #include "../mwworld/manualref.hpp"
@@ -22,8 +24,7 @@ namespace MWMechanics
 
         failChance += levItem->mChanceNone;
 
-        int random = static_cast<int>(static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100)); // [0, 99]
-        if (random < failChance)
+        if (OEngine::Misc::Rng::roll0to99() < failChance)
             return std::string();
 
         std::vector<std::string> candidates;
@@ -52,7 +53,7 @@ namespace MWMechanics
         }
         if (candidates.empty())
             return std::string();
-        std::string item = candidates[std::rand()%candidates.size()];
+        std::string item = candidates[OEngine::Misc::Rng::rollDice(candidates.size())];
 
         // Vanilla doesn't fail on nonexistent items in levelled lists
         if (!MWBase::Environment::get().getWorld()->getStore().find(Misc::StringUtils::lowerCase(item)))

apps/openmw/mwmechanics/mechanicsmanagerimp.cpp

@@ -2,6 +2,8 @@
 #include "mechanicsmanagerimp.hpp"
 #include "npcstats.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/stolenitems.hpp>
 
 #include "../mwworld/esmstore.hpp"
@@ -723,7 +725,7 @@ namespace MWMechanics
         float x = 0;
         float y = 0;
 
-        float roll = static_cast<float> (std::rand()) / RAND_MAX * 100;
+        float roll = OEngine::Misc::Rng::rollClosedProbability() * 100;
 
         if (type == PT_Admire)
         {
@@ -1378,9 +1380,8 @@ namespace MWMechanics
             y = obsTerm * observerStats.getFatigueTerm() * fSneakViewMult;
 
         float target = x - y;
-        int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
 
-        return (roll >= target);
+        return (OEngine::Misc::Rng::roll0to99() >= target);
     }
 
     void MechanicsManager::startCombat(const MWWorld::Ptr &ptr, const MWWorld::Ptr &target)

apps/openmw/mwmechanics/pickpocket.cpp

@@ -1,5 +1,7 @@
 #include "pickpocket.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwworld/class.hpp"
 #include "../mwworld/esmstore.hpp"
 
@@ -39,7 +41,7 @@ namespace MWMechanics
         int iPickMaxChance = MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>()
                 .find("iPickMaxChance")->getInt();
 
-        int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
+        int roll = OEngine::Misc::Rng::roll0to99();
         if (t < pcSneak / iPickMinChance)
         {
             return (roll > int(pcSneak / iPickMinChance));

apps/openmw/mwmechanics/repair.cpp

@@ -2,6 +2,8 @@
 
 #include <boost/format.hpp>
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwbase/world.hpp"
 #include "../mwbase/environment.hpp"
 #include "../mwbase/mechanicsmanager.hpp"
@@ -46,7 +48,7 @@ void Repair::repair(const MWWorld::Ptr &itemToRepair)
 
     float x = (0.1f * pcStrength + 0.1f * pcLuck + armorerSkill) * fatigueTerm;
 
-    int roll = static_cast<int>(static_cast<float> (std::rand()) / RAND_MAX * 100);
+    int roll = OEngine::Misc::Rng::roll0to99();
     if (roll <= x)
     {
         int y = static_cast<int>(fRepairAmountMult * toolQuality * roll);

apps/openmw/mwmechanics/security.cpp

@@ -1,5 +1,7 @@
 #include "security.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwworld/class.hpp"
 #include "../mwworld/containerstore.hpp"
 #include "../mwworld/esmstore.hpp"
@@ -48,8 +50,7 @@ namespace MWMechanics
         else
         {
             MWBase::Environment::get().getMechanicsManager()->objectOpened(mActor, lock);
-            int roll = static_cast<int>(static_cast<float> (std::rand()) / RAND_MAX * 100);
-            if (roll <= x)
+            if (OEngine::Misc::Rng::roll0to99() <= x)
             {
                 lock.getClass().unlock(lock);
                 resultMessage = "#{sLockSuccess}";
@@ -90,8 +91,7 @@ namespace MWMechanics
         else
         {
             MWBase::Environment::get().getMechanicsManager()->objectOpened(mActor, trap);
-            int roll = static_cast<int>(static_cast<float> (std::rand()) / RAND_MAX * 100);
-            if (roll <= x)
+            if (OEngine::Misc::Rng::roll0to99() <= x)
             {
                 trap.getCellRef().setTrap("");
 

apps/openmw/mwmechanics/spellcasting.cpp

@@ -4,6 +4,8 @@
 
 #include <boost/format.hpp>
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwbase/windowmanager.hpp"
 #include "../mwbase/soundmanager.hpp"
 #include "../mwbase/mechanicsmanager.hpp"
@@ -280,7 +282,7 @@ namespace MWMechanics
             if (castChance > 0)
                 x *= 50 / castChance;
 
-            float roll = static_cast<float>(std::rand()) / RAND_MAX * 100;
+            float roll = OEngine::Misc::Rng::rollClosedProbability() * 100;
             if (magicEffect->mData.mFlags & ESM::MagicEffect::NoMagnitude)
                 roll -= resistance;
 
@@ -383,8 +385,7 @@ namespace MWMechanics
                         target.getClass().getCreatureStats(target).getMagicEffects().get(ESM::MagicEffect::ResistCommonDisease).getMagnitude()
                       : target.getClass().getCreatureStats(target).getMagicEffects().get(ESM::MagicEffect::ResistBlightDisease).getMagnitude();
 
-            int roll = static_cast<int>(std::rand()/ (static_cast<double> (RAND_MAX) + 1) * 100); // [0, 99]
-            if (roll <= x)
+            if (OEngine::Misc::Rng::roll0to99() <= x)
             {
                 // Fully resisted, show message
                 if (target == MWBase::Environment::get().getWorld()->getPlayerPtr())
@@ -414,8 +415,7 @@ namespace MWMechanics
         if (spell && caster != target && target.getClass().isActor())
         {
             float absorb = target.getClass().getCreatureStats(target).getMagicEffects().get(ESM::MagicEffect::SpellAbsorption).getMagnitude();
-            int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-            absorbed = (roll < absorb);
+            absorbed = (OEngine::Misc::Rng::roll0to99() < absorb);
             if (absorbed)
             {
                 const ESM::Static* absorbStatic = MWBase::Environment::get().getWorld()->getStore().get<ESM::Static>().find ("VFX_Absorb");
@@ -463,8 +463,7 @@ namespace MWMechanics
                 if (!reflected && magnitudeMult > 0 && !caster.isEmpty() && caster != target && !(magicEffect->mData.mFlags & ESM::MagicEffect::Unreflectable))
                 {
                     float reflect = target.getClass().getCreatureStats(target).getMagicEffects().get(ESM::MagicEffect::Reflect).getMagnitude();
-                    int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-                    bool isReflected = (roll < reflect);
+                    bool isReflected = (OEngine::Misc::Rng::roll0to99() < reflect);
                     if (isReflected)
                     {
                         const ESM::Static* reflectStatic = MWBase::Environment::get().getWorld()->getStore().get<ESM::Static>().find ("VFX_Reflect");
@@ -492,7 +491,7 @@ namespace MWMechanics
 
             if (magnitudeMult > 0 && !absorbed)
             {
-                float random = std::rand() / static_cast<float>(RAND_MAX);
+                float random = OEngine::Misc::Rng::rollClosedProbability();
                 float magnitude = effectIt->mMagnMin + (effectIt->mMagnMax - effectIt->mMagnMin) * random;
                 magnitude *= magnitudeMult;
 
@@ -824,8 +823,7 @@ namespace MWMechanics
 
             // Check success
             float successChance = getSpellSuccessChance(spell, mCaster);
-            int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
-            if (!fail && roll >= successChance)
+            if (OEngine::Misc::Rng::roll0to99() >= successChance)
             {
                 if (mCaster == MWBase::Environment::get().getWorld()->getPlayerPtr())
                     MWBase::Environment::get().getWindowManager()->messageBox("#{sMagicSkillFail}");
@@ -903,7 +901,7 @@ namespace MWMechanics
                     + 0.1f * creatureStats.getAttribute (ESM::Attribute::Luck).getModified())
                     * creatureStats.getFatigueTerm();
 
-        int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 100); // [0, 99]
+        int roll = OEngine::Misc::Rng::roll0to99();
         if (roll > x)
         {
             // "X has no effect on you"

apps/openmw/mwmechanics/spells.cpp

@@ -38,7 +38,7 @@ namespace MWMechanics
                 for (unsigned int i=0; i<spell->mEffects.mList.size();++i)
                 {
                     if (spell->mEffects.mList[i].mMagnMin != spell->mEffects.mList[i].mMagnMax)
-                        random[i] = static_cast<float> (std::rand()) / RAND_MAX;
+                        random[i] = OEngine::Misc::Rng::rollClosedProbability();
                 }
             }
 

apps/openmw/mwrender/npcanimation.cpp

@@ -12,6 +12,8 @@
 
 #include <extern/shiny/Main/Factory.hpp>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/misc/resourcehelpers.hpp>
 
 #include "../mwworld/esmstore.hpp"
@@ -101,7 +103,7 @@ void HeadAnimationTime::setEnabled(bool enabled)
 
 void HeadAnimationTime::resetBlinkTimer()
 {
-    mBlinkTimer = -(2 + (std::rand() / static_cast<float>(RAND_MAX)) * 6);
+    mBlinkTimer = -(2.0f + OEngine::Misc::Rng::rollDice(6));
 }
 
 void HeadAnimationTime::update(float dt)

apps/openmw/mwrender/sky.cpp

@@ -19,6 +19,8 @@
 
 #include <boost/lexical_cast.hpp>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/nifogre/ogrenifloader.hpp>
 #include <components/misc/resourcehelpers.hpp>
 
@@ -464,8 +466,8 @@ void SkyManager::updateRain(float dt)
 
             // TODO: handle rain settings from Morrowind.ini
             const float rangeRandom = 100;
-            float xOffs = (std::rand()/(RAND_MAX+1.0f)) * rangeRandom - (rangeRandom/2);
-            float yOffs = (std::rand()/(RAND_MAX+1.0f)) * rangeRandom - (rangeRandom/2);
+            float xOffs = OEngine::Misc::Rng::rollProbability() * rangeRandom - (rangeRandom / 2);
+            float yOffs = OEngine::Misc::Rng::rollProbability() * rangeRandom - (rangeRandom / 2);
 
             // Create a separate node to control the offset, since a node with setInheritOrientation(false) will still
             // consider the orientation of the parent node for its position, just not for its orientation

apps/openmw/mwsound/soundmanagerimp.cpp

@@ -4,6 +4,8 @@
 #include <algorithm>
 #include <map>
 
+#include <openengine/misc/rng.hpp>
+
 #include "../mwbase/environment.hpp"
 #include "../mwbase/world.hpp"
 #include "../mwbase/statemanager.hpp"
@@ -224,7 +226,7 @@ namespace MWSound
         if(!filelist.size())
             return;
 
-        int i = rand()%filelist.size();
+        int i = OEngine::Misc::Rng::rollDice(filelist.size());
 
         // Don't play the same music track twice in a row
         if (filelist[i] == mLastPlayedMusic)
@@ -559,7 +561,7 @@ namespace MWSound
         if(!cell->isExterior() || sTimePassed < sTimeToNextEnvSound)
             return;
 
-        float a = std::rand() / static_cast<float>(RAND_MAX);
+        float a = OEngine::Misc::Rng::rollClosedProbability();
         // NOTE: We should use the "Minimum Time Between Environmental Sounds" and
         // "Maximum Time Between Environmental Sounds" fallback settings here.
         sTimeToNextEnvSound = 5.0f*a + 15.0f*(1.0f-a);
@@ -588,7 +590,7 @@ namespace MWSound
                 return;
         }
 
-        int r = (int)(rand()/((double)RAND_MAX+1) * total);
+        int r = OEngine::Misc::Rng::rollDice(total);
         int pos = 0;
 
         soundIter = regn->mSoundList.begin();

apps/openmw/mwworld/inventorystore.cpp

@@ -364,7 +364,7 @@ void MWWorld::InventoryStore::updateMagicEffects(const Ptr& actor)
                 // Roll some dice, one for each effect
                 params.resize(enchantment.mEffects.mList.size());
                 for (unsigned int i=0; i<params.size();++i)
-                    params[i].mRandom = static_cast<float> (std::rand()) / RAND_MAX;
+                    params[i].mRandom = OEngine::Misc::Rng::rollClosedProbability();
 
                 // Try resisting each effect
                 int i=0;

apps/openmw/mwworld/store.hpp

@@ -7,6 +7,8 @@
 #include <stdexcept>
 #include <sstream>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/esmwriter.hpp>
 
 #include <components/loadinglistener/loadinglistener.hpp>
@@ -178,7 +180,7 @@ namespace MWWorld
             std::vector<const T*> results;
             std::for_each(mShared.begin(), mShared.end(), GetRecords(id, &results));
             if(!results.empty())
-                return results[int(std::rand()/((double)RAND_MAX+1)*results.size())];
+                return results[OEngine::Misc::Rng::rollDice(results.size())];
             return NULL;
         }
 

apps/openmw/mwworld/weather.cpp

@@ -3,6 +3,8 @@
 
 #include "weather.hpp"
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/esm/weatherstate.hpp>
 
 #include "../mwbase/environment.hpp"
@@ -526,7 +528,7 @@ void WeatherManager::update(float duration, bool paused)
                 if (mThunderSoundDelay <= 0)
                 {
                     // pick a random sound
-                    int sound = rand() % 4;
+                    int sound = OEngine::Misc::Rng::rollDice(4);
                     std::string* soundName = NULL;
                     if (sound == 0) soundName = &mThunderSoundID0;
                     else if (sound == 1) soundName = &mThunderSoundID1;
@@ -542,7 +544,7 @@ void WeatherManager::update(float duration, bool paused)
                     mRendering->getSkyManager()->setLightningStrength( mThunderFlash / mThunderThreshold );
                 else
                 {
-                    mThunderChanceNeeded = static_cast<float>(rand() % 100);
+                    mThunderChanceNeeded = static_cast<float>(OEngine::Misc::Rng::rollDice(100));
                     mThunderChance = 0;
                     mRendering->getSkyManager()->setLightningStrength( 0.f );
                 }
@@ -624,7 +626,7 @@ std::string WeatherManager::nextWeather(const ESM::Region* region) const
      * 70% will be greater than 30 (in theory).
      */
 
-    int chance = (rand() % 100) + 1; // 1..100
+    int chance = OEngine::Misc::Rng::rollDice(100) + 1; // 1..100
     int sum = 0;
     unsigned int i = 0;
     for (; i < probability.size(); ++i)

apps/openmw/mwworld/worldimp.cpp

@@ -14,6 +14,8 @@
 #include <libs/openengine/bullet/trace.h>
 #include <libs/openengine/bullet/physic.hpp>
 
+#include <openengine/misc/rng.hpp>
+
 #include <components/bsa/bsa_archive.hpp>
 #include <components/files/collections.hpp>
 #include <components/compiler/locals.hpp>
@@ -3133,7 +3135,7 @@ namespace MWWorld
         const ESM::CreatureLevList* list = getStore().get<ESM::CreatureLevList>().find(creatureList);
 
         int iNumberCreatures = getStore().get<ESM::GameSetting>().find("iNumberCreatures")->getInt();
-        int numCreatures = static_cast<int>(1 + std::rand() / (static_cast<double> (RAND_MAX)+1) * iNumberCreatures); // [1, iNumberCreatures]
+        int numCreatures = 1 + OEngine::Misc::Rng::rollDice(iNumberCreatures); // [1, iNumberCreatures]
 
         for (int i=0; i<numCreatures; ++i)
         {
@@ -3184,7 +3186,7 @@ namespace MWWorld
 
         std::stringstream modelName;
         modelName << "Blood_Model_";
-        int roll = static_cast<int>(std::rand() / (static_cast<double> (RAND_MAX)+1) * 3); // [0, 2]
+        int roll = OEngine::Misc::Rng::rollDice(3); // [0, 2]
         modelName << roll;
         std::string model = "meshes\\" + getFallback()->getFallbackString(modelName.str());
 

components/CMakeLists.txt

@@ -160,7 +160,11 @@ include_directories(${BULLET_INCLUDE_DIRS} ${CMAKE_CURRENT_BINARY_DIR})
 
 add_library(components STATIC ${COMPONENT_FILES} ${MOC_SRCS} ${ESM_UI_HDR})
 
-target_link_libraries(components ${Boost_LIBRARIES} ${OGRE_LIBRARIES})
+target_link_libraries(components 
+    ${Boost_LIBRARIES} 
+    ${OGRE_LIBRARIES}
+    ${OENGINE_LIBRARY}    
+)
 
 if (GIT_CHECKOUT)
     add_dependencies (components git-version)

components/nifogre/particles.cpp

@@ -12,6 +12,8 @@
 #include <OgreSceneNode.h>
 #include <OgreSceneManager.h>
 
+#include <openengine/misc/rng.hpp>
+
 /* FIXME: "Nif" isn't really an appropriate emitter name. */
 class NifEmitter : public Ogre::ParticleEmitter
 {
@@ -171,7 +173,7 @@ public:
         Ogre::Real& timeToLive = particle->timeToLive;
 #endif
 
-        Ogre::Node* emitterBone = mEmitterBones.at((int)(::rand()/(RAND_MAX+1.0)*mEmitterBones.size()));
+        Ogre::Node* emitterBone = mEmitterBones.at(OEngine::Misc::Rng::rollDice(mEmitterBones.size()));
 
         position = xOff + yOff + zOff +
                  mParticleBone->_getDerivedOrientation().Inverse() * (emitterBone->_getDerivedPosition()

libs/openengine/CMakeLists.txt

@@ -23,7 +23,12 @@ set(OENGINE_BULLET
     bullet/trace.h
 )
 
-set(OENGINE_ALL ${OENGINE_OGRE} ${OENGINE_GUI} ${OENGINE_BULLET})
+set(OENGINE_MISC
+    misc/rng.cpp
+    misc/rng.hpp
+)
+
+set(OENGINE_ALL ${OENGINE_OGRE} ${OENGINE_GUI} ${OENGINE_BULLET} ${OENGINE_MISC})
 
 set(OENGINE_LIBRARY "oengine")
 set(OENGINE_LIBRARY ${OENGINE_LIBRARY} PARENT_SCOPE)

libs/openengine/misc/rng.cpp

@@ -0,0 +1,29 @@
+#include "rng.hpp"
+#include <cstdlib>
+#include <ctime>
+
+namespace OEngine {
+namespace Misc {
+
+    void Rng::init()
+    {
+        std::srand(static_cast<unsigned int>(std::time(NULL)));
+    }
+
+    float Rng::rollProbability()
+    {
+        return static_cast<float>(std::rand() / (static_cast<double>(RAND_MAX)+1.0));
+    }
+
+    float Rng::rollClosedProbability()
+    {
+        return static_cast<float>(std::rand() / static_cast<double>(RAND_MAX));
+    }
+
+    int Rng::rollDice(int max)
+    {
+        return static_cast<int>((std::rand() / (static_cast<double>(RAND_MAX)+1.0)) * (max));
+    }
+
+}
+}

libs/openengine/misc/rng.hpp

@@ -0,0 +1,36 @@
+#ifndef MISC_RNG_H
+#define MISC_RNG_H
+
+#include <cassert>
+
+namespace OEngine {
+namespace Misc
+{
+
+/*
+  Provides central implementation of the RNG logic
+*/
+class Rng
+{
+public:
+
+    /// seed the RNG
+    static void init();
+
+    /// return value in range [0.0f, 1.0f)  <- note open upper range.
+    static float rollProbability();
+  
+    /// return value in range [0.0f, 1.0f]  <- note closed upper range.
+    static float rollClosedProbability();
+
+    /// return value in range [0, max)  <- note open upper range.
+    static int rollDice(int max);
+
+    /// return value in range [0, 99]
+    static int roll0to99() { return rollDice(100); }
+};
+
+}
+}
+
+#endif

libs/openengine/ogre/selectionbuffer.cpp

@@ -10,6 +10,8 @@
 
 #include <stdexcept>
 
+#include <openengine/misc/rng.hpp>
+
 #include <extern/shiny/Main/Factory.hpp>
 
 namespace OEngine
@@ -145,7 +147,7 @@ namespace Render
 
     void SelectionBuffer::getNextColour ()
     {
-        Ogre::ARGB color = static_cast<Ogre::ARGB>((float(rand()) / float(RAND_MAX)) * std::numeric_limits<Ogre::uint32>::max());
+        Ogre::ARGB color = static_cast<Ogre::ARGB>(OEngine::Misc::Rng::rollClosedProbability() * std::numeric_limits<Ogre::uint32>::max());
 
         if (mCurrentColour.getAsARGB () == color)
         {