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Added extra controls into osgDB::DatabasePager for customizing how

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much time is allocated to compiling and deleting OpenGL objects, also
added support into osgProducer::OsgSceneHandler.cpp for these new parameters.

The new cotrols are:

    DatabasePager::s/getTargetFrameRate(..)
    DatabasePager::s/getMinimumTimeAvailableForGLCompileAndDeletePerFrame()
    DatabasePager::s/getMaximumNumOfObjectsToCompilePerFrame()
This commit is contained in:
Robert Osfield
2005-03-17 19:32:09 +00:00
parent a06ca64061
commit 8bb4649cd5
3 changed files with 88 additions and 4 deletions
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41
include/osgDB/DatabasePager
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@@ -156,6 +156,43 @@ class OSGDB_EXPORT DatabasePager : public osg::NodeVisitor::DatabaseRequestHandl
virtual void registerPagedLODs(osg::Node* subgraph);
/** 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).
*/
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.*/
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; }
/** Set the maximum number of OpenGL objects that the page should attempt to compile per frame.
* Note, Lower values reduces chances of a frame drop but lower the rate that database will be paged in at.
* Default value is 8. */
void setMaximumNumOfObjectsToCompilePerFrame(unsigned int num) { _maximumNumOfObjectsToCompilePerFrame = num; }
/** Get the maximum number of OpenGL objects that the page should attempt to compile per frame.*/
unsigned int getMaximumNumOfObjectsToCompilePerFrame() const { return _maximumNumOfObjectsToCompilePerFrame; }
/** Set the amount of time that a subgraph will be kept without being visited in the cull traversal
* before being removed.*/
void setExpiryDelay(double expiryDelay) { _expiryDelay = expiryDelay; }
@@ -327,6 +364,10 @@ class OSGDB_EXPORT DatabasePager : public osg::NodeVisitor::DatabaseRequestHandl
double _expiryDelay;
ActiveGraphicsContexts _activeGraphicsContexts;
double _targetFrameRate;
double _minimumTimeAvailableForGLCompileAndDeletePerFrame;
unsigned int _maximumNumOfObjectsToCompilePerFrame;
};
}