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107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
#ifndef OPENMW_COMPONENTS_SCENEUTIL_CONTROLLER_H
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#define OPENMW_COMPONENTS_SCENEUTIL_CONTROLLER_H
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#include <memory>
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#include <osg/NodeVisitor>
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namespace SceneUtil
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{
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class ControllerSource
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{
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public:
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virtual ~ControllerSource() { }
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virtual float getValue(osg::NodeVisitor* nv) = 0;
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};
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class FrameTimeSource : public ControllerSource
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{
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public:
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FrameTimeSource();
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virtual float getValue(osg::NodeVisitor* nv);
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};
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/// @note ControllerFunctions may be shared - you should not hold any state in it. That is why all its methods are declared const.
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class ControllerFunction
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{
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public:
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virtual float calculate(float input) const = 0;
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/// Get the "stop time" of the controller function, typically the maximum of the calculate() function.
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/// May not be meaningful for all types of controller functions.
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virtual float getMaximum() const = 0;
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};
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class Controller
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{
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public:
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Controller();
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virtual ~Controller() {}
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bool hasInput() const;
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float getInputValue(osg::NodeVisitor* nv);
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void setSource(std::shared_ptr<ControllerSource> source);
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void setFunction(std::shared_ptr<ControllerFunction> function);
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std::shared_ptr<ControllerSource> getSource() const;
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std::shared_ptr<ControllerFunction> getFunction() const;
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private:
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std::shared_ptr<ControllerSource> mSource;
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// The source value gets passed through this function before it's passed on to the DestValue.
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std::shared_ptr<ControllerFunction> mFunction;
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};
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/// Pure virtual base class - visit() all controllers that are attached as UpdateCallbacks in a scene graph.
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class ControllerVisitor : public osg::NodeVisitor
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{
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public:
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ControllerVisitor();
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virtual void apply(osg::Node& node);
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// Technically not required as the default implementation would trickle down to apply(Node&) anyway,
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// but we'll shortcut instead to avoid the chain of virtual function calls
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virtual void apply(osg::MatrixTransform& node);
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virtual void apply(osg::Geometry& node);
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void applyNode(osg::Node& node);
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virtual void visit(osg::Node& node, Controller& ctrl) = 0;
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};
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class AssignControllerSourcesVisitor : public ControllerVisitor
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{
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public:
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AssignControllerSourcesVisitor();
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AssignControllerSourcesVisitor(std::shared_ptr<ControllerSource> toAssign);
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/// Assign the wanted ControllerSource. May be overridden in derived classes.
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/// By default assigns the ControllerSource passed to the constructor of this class if no ControllerSource is assigned to that controller yet.
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virtual void visit(osg::Node& node, Controller& ctrl);
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private:
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std::shared_ptr<ControllerSource> mToAssign;
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};
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/// Finds the maximum of all controller functions in the given scene graph
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class FindMaxControllerLengthVisitor : public ControllerVisitor
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{
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public:
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FindMaxControllerLengthVisitor();
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virtual void visit(osg::Node& , Controller& ctrl);
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float getMaxLength() const;
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private:
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float mMaxLength;
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};
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}
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#endif
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