Use controllers to animate lights in ObjectLists

CMakeLists.txt

@@ -78,6 +78,7 @@ set(LIBDIR ${CMAKE_SOURCE_DIR}/libs)
 set(OENGINE_OGRE
   ${LIBDIR}/openengine/ogre/renderer.cpp
   ${LIBDIR}/openengine/ogre/fader.cpp
+  ${LIBDIR}/openengine/ogre/lights.cpp
   ${LIBDIR}/openengine/ogre/particles.cpp
   ${LIBDIR}/openengine/ogre/selectionbuffer.cpp
   ${LIBDIR}/openengine/ogre/imagerotate.cpp

apps/openmw/mwrender/animation.cpp

@@ -8,6 +8,9 @@
 #include <OgreBone.h>
 #include <OgreSubMesh.h>
 #include <OgreSceneManager.h>
+#include <OgreControllerManager.h>
+
+#include <libs/openengine/ogre/lights.hpp>
 
 #include "../mwbase/environment.hpp"
 #include "../mwbase/soundmanager.hpp"
@@ -281,26 +284,18 @@ void Animation::addExtraLight(Ogre::SceneManager *sceneMgr, NifOgre::ObjectList
     Ogre::Light *olight = objlist.mLights.back();
     olight->setDiffuseColour(color);
 
-    bool interior = !(mPtr.isInCell() && mPtr.getCell()->mCell->isExterior());
-
-    // TODO: Create Controllers for these
-#if 0
-    // randomize lights animations
-    info.time = Ogre::Math::RangeRandom(-500, +500);
-    info.phase = Ogre::Math::RangeRandom(-500, +500);
-
-    if((light->mData.mFlags&ESM::Light::Flicker))
-        info.type = LT_Flicker;
-    else if((light->mData.mFlags&ESM::Light::FlickerSlow))
-        info.type = LT_FlickerSlow;
-    else if((light->mData.mFlags&ESM::Light::Pulse))
-        info.type = LT_Pulse;
-    else if((light->mData.mFlags&ESM::Light::PulseSlow))
-        info.type = LT_PulseSlow;
-    else
-        info.type = LT_Normal;
-#endif
+    Ogre::ControllerValueRealPtr src(Ogre::ControllerManager::getSingleton().getFrameTimeSource());
+    Ogre::ControllerValueRealPtr dest(OGRE_NEW OEngine::Render::LightValue(olight, color));
+    Ogre::ControllerFunctionRealPtr func(OGRE_NEW OEngine::Render::LightFunction(
+        (light->mData.mFlags&ESM::Light::Flicker) ? OEngine::Render::LT_Flicker :
+        (light->mData.mFlags&ESM::Light::FlickerSlow) ? OEngine::Render::LT_FlickerSlow :
+        (light->mData.mFlags&ESM::Light::Pulse) ? OEngine::Render::LT_Pulse :
+        (light->mData.mFlags&ESM::Light::PulseSlow) ? OEngine::Render::LT_PulseSlow :
+        OEngine::Render::LT_Normal
+    ));
+    objlist.mControllers.push_back(Ogre::Controller<Ogre::Real>(src, dest, func));
 
+    bool interior = !(mPtr.isInCell() && mPtr.getCell()->mCell->isExterior());
     bool quadratic = fallback->getFallbackBool("LightAttenuation_OutQuadInLin") ?
                      !interior : fallback->getFallbackBool("LightAttenuation_UseQuadratic");
 

apps/openmw/mwrender/animation.hpp

@@ -52,6 +52,7 @@ protected:
         virtual void setValue(Ogre::Real value);
     };
 
+
     class NullAnimationValue : public Ogre::ControllerValue<Ogre::Real>
     {
     public:
@@ -61,6 +62,7 @@ protected:
         { }
     };
 
+
     struct AnimSource : public Ogre::AnimationAlloc {
         NifOgre::TextKeyMap mTextKeys;
         std::vector<Ogre::Controller<Ogre::Real> > mControllers[sNumGroups];

libs/openengine/ogre/lights.cpp

@@ -0,0 +1,118 @@
+#include "lights.hpp"
+
+#include <OgreLight.h>
+#include <OgreMath.h>
+
+namespace OEngine {
+namespace Render {
+
+
+LightFunction::LightFunction(LightType type)
+  : ControllerFunction<Ogre::Real>(true)
+  , mType(type)
+  , mPhase(Ogre::Math::RangeRandom(-500.0f, +500.0f))
+  , mDirection(1.0f)
+{
+}
+
+Ogre::Real LightFunction::pulseAmplitude(Ogre::Real time)
+{
+    return std::sin(time);
+}
+
+Ogre::Real LightFunction::flickerAmplitude(Ogre::Real time)
+{
+    static const float fb = 1.17024f;
+    static const float f[3] = { 1.5708f,   4.18774f, 5.19934f };
+    static const float o[3] = { 0.804248f, 2.11115f, 3.46832f };
+    static const float m[3] = { 1.0f,      0.785f,   0.876f   };
+    static const float s = 0.394f;
+
+    float v = 0.0f;
+    for(int i = 0;i < 3;++i)
+        v += std::sin(fb*time*f[i] + o[1])*m[i];
+    return v * s;
+}
+
+Ogre::Real LightFunction::flickerFrequency(Ogre::Real phase)
+{
+    static const float fa = 0.785398f;
+    static const float tdo = 0.94f;
+    static const float tdm = 2.48f;
+
+    return tdo + tdm*std::sin(fa * phase);
+}
+
+Ogre::Real LightFunction::calculate(Ogre::Real value)
+{
+    Ogre::Real brightness = 1.0f;
+    float cycle_time;
+    float time_distortion;
+
+    if(mType == LT_Pulse || mType == LT_PulseSlow)
+    {
+        cycle_time = 2.0f * Ogre::Math::PI;
+        time_distortion = 20.0f;
+    }
+    else
+    {
+        static const float fa = 0.785398f;
+        static const float phase_wavelength = 120.0f * 3.14159265359f / fa;
+
+        cycle_time = 500.0f;
+        mPhase = std::fmod(mPhase + value, phase_wavelength);
+        time_distortion = flickerFrequency(mPhase);
+    }
+
+    mDeltaCount += mDirection*value*time_distortion;
+    if(mDirection > 0 && mDeltaCount > +cycle_time)
+    {
+        mDirection = -1.0f;
+        mDeltaCount = 2.0f*cycle_time - mDeltaCount;
+    }
+    if(mDirection < 0 && mDeltaCount < -cycle_time)
+    {
+        mDirection = +1.0f;
+        mDeltaCount = -2.0f*cycle_time - mDeltaCount;
+    }
+
+    static const float fast = 4.0f/1.0f;
+    static const float slow = 1.0f/1.0f;
+
+    // These formulas are just guesswork, but they work pretty well
+    if(mType == LT_Normal)
+    {
+        // Less than 1/255 light modifier for a constant light:
+        brightness = 1.0 + flickerAmplitude(mDeltaCount*slow)/255.0f;
+    }
+    else if(mType == LT_Flicker)
+        brightness = 0.75 + flickerAmplitude(mDeltaCount*fast)*0.25;
+    else if(mType == LT_FlickerSlow)
+        brightness = 0.75 + flickerAmplitude(mDeltaCount*slow)*0.25;
+    else if(mType == LT_Pulse)
+        brightness = 1.0 + pulseAmplitude(mDeltaCount*fast)*0.25;
+    else if(mType == LT_PulseSlow)
+        brightness = 1.0 + pulseAmplitude(mDeltaCount*slow)*0.25;
+
+    return brightness;
+}
+
+
+LightValue::LightValue(Ogre::Light *light, const Ogre::ColourValue &color)
+  : mTarget(light)
+  , mColor(color)
+{
+}
+
+Ogre::Real LightValue::getValue() const
+{
+    return 0.0f;
+}
+
+void LightValue::setValue(Ogre::Real value)
+{
+    mTarget->setDiffuseColour(mColor * value);
+}
+
+}
+}

libs/openengine/ogre/lights.hpp

@@ -0,0 +1,51 @@
+#ifndef OENGINE_OGRE_LIGHTS_H
+#define OENGINE_OGRE_LIGHTS_H
+
+#include <OgreController.h>
+#include <OgreColourValue.h>
+
+/*
+ * Controller classes to handle pulsing and flicker lights
+ */
+
+namespace OEngine {
+namespace Render {
+    enum LightType {
+        LT_Normal,
+        LT_Flicker,
+        LT_FlickerSlow,
+        LT_Pulse,
+        LT_PulseSlow
+    };
+
+    class LightFunction : public Ogre::ControllerFunction<Ogre::Real>
+    {
+        LightType mType;
+        Ogre::Real mPhase;
+        Ogre::Real mDirection;
+
+        static Ogre::Real pulseAmplitude(Ogre::Real time);
+
+        static Ogre::Real flickerAmplitude(Ogre::Real time);
+        static Ogre::Real flickerFrequency(Ogre::Real phase);
+
+    public:
+        LightFunction(LightType type);
+        virtual Ogre::Real calculate(Ogre::Real value);
+    };
+
+    class LightValue : public Ogre::ControllerValue<Ogre::Real>
+    {
+        Ogre::Light *mTarget;
+        Ogre::ColourValue mColor;
+
+    public:
+        LightValue(Ogre::Light *light, const Ogre::ColourValue &color);
+
+        virtual Ogre::Real getValue() const;
+        virtual void setValue(Ogre::Real value);
+    };
+}
+}
+
+#endif