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77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
#include "lightcontroller.hpp"
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#include <cmath>
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#include <osg/NodeVisitor>
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#include <components/sceneutil/lightmanager.hpp>
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#include <components/misc/rng.hpp>
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namespace SceneUtil
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{
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LightController::LightController()
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: mType(LT_Normal)
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, mPhase(0.25f + Misc::Rng::rollClosedProbability() * 0.75f)
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, mBrightness(0.675f)
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, mStartTime(0.0)
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, mLastTime(0.0)
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, mTicksToAdvance(0.f)
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{
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}
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void LightController::setType(LightController::LightType type)
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{
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mType = type;
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}
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void LightController::operator ()(osg::Node* node, osg::NodeVisitor* nv)
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{
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double time = nv->getFrameStamp()->getSimulationTime();
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if (mStartTime == 0)
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mStartTime = time;
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// disabled early out, light state needs to be set every frame regardless of change, due to the double buffering
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//if (time == mLastTime)
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// return;
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if (mType == LT_Normal)
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{
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static_cast<SceneUtil::LightSource*>(node)->getLight(nv->getTraversalNumber())->setDiffuse(mDiffuseColor);
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traverse(node, nv);
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return;
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}
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// Updating flickering at 15 FPS like vanilla.
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constexpr float updateRate = 15.f;
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mTicksToAdvance = static_cast<float>(time - mStartTime - mLastTime) * updateRate * 0.25f + mTicksToAdvance * 0.75f;
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mLastTime = time - mStartTime;
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float speed = (mType == LT_Flicker || mType == LT_Pulse) ? 0.1f : 0.05f;
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if (mBrightness >= mPhase)
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mBrightness -= mTicksToAdvance * speed;
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else
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mBrightness += mTicksToAdvance * speed;
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if (std::abs(mBrightness - mPhase) < speed)
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{
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if (mType == LT_Flicker || mType == LT_FlickerSlow)
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mPhase = 0.25f + Misc::Rng::rollClosedProbability() * 0.75f;
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else // if (mType == LT_Pulse || mType == LT_PulseSlow)
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mPhase = mPhase <= 0.5f ? 1.f : 0.25f;
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}
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auto* lightSource = static_cast<SceneUtil::LightSource*>(node);
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lightSource->getLight(nv->getTraversalNumber())->setDiffuse(mDiffuseColor * mBrightness * lightSource->getActorFade());
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traverse(node, nv);
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}
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void LightController::setDiffuse(const osg::Vec4f& color)
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{
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mDiffuseColor = color;
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}
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}
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