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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* OpenSceneGraph Public License for more details.
*/
#ifndef OSGVIEWER_RENDERER
#define OSGVIEWER_RENDERER 1
#include <osg/Timer>
#include <osgDB/DatabasePager>
#include <osgUtil/SceneView>
#include <osgViewer/Export>
namespace osgViewer {
class OSGVIEWER_EXPORT OpenGLQuerySupport
{
public:
OpenGLQuerySupport();
typedef std::pair<GLuint, int> QueryFrameNumberPair;
typedef std::list<QueryFrameNumberPair> QueryFrameNumberList;
typedef std::vector<GLuint> QueryList;
void setStartTick(osg::Timer_t startTick) { _startTick = startTick; }
osg::Timer_t getStartTick() const { return _startTick; }
void checkQuery(osg::Stats* stats);
GLuint createQueryObject();
void beginQuery(int frameNumber);
void endQuery();
void initialize(osg::State* state);
protected:
osg::Timer_t _startTick;
bool _initialized;
bool _timerQuerySupported;
const osg::Drawable::Extensions* _extensions;
QueryFrameNumberList _queryFrameNumberList;
QueryList _availableQueryObjects;
double _previousQueryTime;
};
class OSGVIEWER_EXPORT Renderer : public osg::GraphicsOperation, public OpenGLQuerySupport
{
public:
Renderer(osg::Camera* camera);
osgUtil::SceneView* getSceneView(unsigned int i) { return _sceneView[i].get(); }
void setDone(bool done) { _done = done; }
bool getDone() { return _done; }
void setGraphicsThreadDoesCull(bool flag);
bool getGraphicsThreadDoesCull() const { return _graphicsThreadDoesCull; }
virtual void cull();
virtual void draw();
virtual void cull_draw();
virtual void compile();
void setCompileOnNextDraw(bool flag) { _compileOnNextDraw = flag; }
bool getCompileOnNextDraw() const { return _compileOnNextDraw; }
virtual void operator () (osg::Object* object);
virtual void operator () (osg::GraphicsContext* context);
virtual void release();
/** Set the target frame rate that the DatabasePager should assume.
* Typically one would set this to the value refresh rate of your display system i.e. 60Hz.
* Default value is 100.
* Usage notes. The TargetFrameRate and the MinimumTimeAvailableForGLCompileAndDeletePerFrame
* parameters are not directly used by DatabasePager, but are should be used as a guide for how
* long to set aside per frame for compiling and deleting OpenGL objects - ie. the value to use
* when calling DatabasePager::compileGLObjectgs(state,availableTime,). The longer amount of
* time to set aside cthe faster databases will be paged in but with increased chance of frame drops,
* the lower the amount of time the set aside the slower databases will paged it but with better
* chance of avoid any frame drops. The default values are chosen to achieve the later when running
* on a modern mid to high end PC.
* The way to compute the amount of available time use a scheme such as :
* availableTime = maximum(1.0/targetFrameRate - timeTakenDuringUpdateCullAndDraw, minimumTimeAvailableForGLCompileAndDeletePerFrame).
*
* Note, the actual TargetFrameRate used is the minimum of this value and that set in the DatabasePager. */
void setTargetFrameRate(double tfr) { _targetFrameRate = tfr; }
/** Get the target frame rate that the DatabasePager should assume.*/
double getTargetFrameRate() const { return _targetFrameRate; }
/** Set the minimum amount of time (in seconds) that should be made available for compiling and delete OpenGL objects per frame.
* Default value is 0.001 (1 millisecond).
* For usage see notes in setTargetFrameRate.
*
* Note, the actual TargetFrameRate used is the minimum of this value and that set in the DatabasePager. */
void setMinimumTimeAvailableForGLCompileAndDeletePerFrame(double ta) { _minimumTimeAvailableForGLCompileAndDeletePerFrame = ta; }
/** Get the minimum amount of time that should be made available for compiling and delete OpenGL objects per frame.
* For usage see notes in setTargetFrameRate.*/
double getMinimumTimeAvailableForGLCompileAndDeletePerFrame() const { return _minimumTimeAvailableForGLCompileAndDeletePerFrame; }
/** FlushTimeRatio governs how much of the spare time in each frame is used for flushing deleted OpenGL objects.
* Default value is 0.5, valid range is 0.1 to 0.9.*/
void setFlushTimeRatio(double ratio) { _flushTimeRatio = ratio; }
double getFlushTimeRatio() const { return _flushTimeRatio; }
/** ConservativeTimeRatio governs how much of the measured spare time in each frame is used for flushing deleted and compile new OpenGL objects.
* Default value is 0.5, valid range is 0.1 to 1.0.
* A ratio near 1.0 will lead to paged databases being compiled and merged quicker but increase the chances of frame drop.
* A ratio near 0.1 will lead to paged databases being compiled and merged closer but reduse the chances of frame drop.*/
void setConservativeTimeRatio(double ratio) { _conservativeTimeRatio = ratio; }
double getConservativeTimeRatio() const { return _conservativeTimeRatio; }
protected:
virtual ~Renderer();
virtual void updateSceneView(osgUtil::SceneView* sceneView);
virtual void flushAndCompile(double currentElapsedFrameTime, osgUtil::SceneView* sceneView, osgDB::DatabasePager* databasePager, osg::GraphicsThread* compileThread);
double _targetFrameRate;
double _minimumTimeAvailableForGLCompileAndDeletePerFrame;
double _flushTimeRatio;
double _conservativeTimeRatio;
osg::observer_ptr<osg::Camera> _camera;
bool _done;
bool _graphicsThreadDoesCull;
bool _compileOnNextDraw;
osg::ref_ptr<osgUtil::SceneView> _sceneView[2];
osg::ref_ptr<osg::FlushDeletedGLObjectsOperation> _flushOperation;
struct OSGVIEWER_EXPORT ThreadSafeQueue
{
OpenThreads::Mutex _mutex;
OpenThreads::Block _block;
typedef std::list<osgUtil::SceneView*> SceneViewList;
SceneViewList _queue;
ThreadSafeQueue();
~ThreadSafeQueue();
void release()
{
_block.release();
}
osgUtil::SceneView* takeFront();
void add(osgUtil::SceneView* sv);
};
ThreadSafeQueue _availableQueue;
ThreadSafeQueue _drawQueue;
};
}
#endif
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