Ogre::GpuProgramUsage Class Reference

This class makes the usage of a vertex and fragment programs (low-level or high-level), with a given set of parameters, explicit. More...

#include <OgreGpuProgramUsage.h>

Inheritance diagram for Ogre::GpuProgramUsage:

Public Member Functions
	GpuProgramUsage (GpuProgramType gptype, Pass *parent)
	Default constructor. More...
	GpuProgramUsage (const GpuProgramUsage &rhs, Pass *newparent)
	Copy constructor. More...
	~GpuProgramUsage ()
void	_load (void)
	Load this usage (and ensure program is loaded) More...
void	_unload (void)
	Unload this usage. More...
size_t	calculateSize (void) const
const GpuProgramParametersSharedPtr &	getParameters (void) const
	Gets the parameters being used here. More...
const GpuProgramPtr &	getProgram () const
	Gets the program being used. More...
const String &	getProgramName (void) const
	Gets the program being used. More...
GpuProgramType	getType (void) const
	Gets the type of program we're trying to link to. More...
void	loadingComplete (Resource *prog)
	Called whenever the resource finishes loading. More...
virtual void	preparingComplete (Resource *)
	Called whenever the resource finishes preparing (paging into memory). More...
void	setParameters (const GpuProgramParametersSharedPtr &params)
	Sets the program parameters that should be used; because parameters can be shared between multiple usages for efficiency, this method is here for you to register externally created parameter objects. More...
void	setProgram (const GpuProgramPtr &prog, bool resetParams=true)
	Sets the program to use. More...
void	setProgramName (const String &name, bool resetParams=true)
	Sets the name of the program to use. More...
void	unloadingComplete (Resource *prog)
	Called whenever the resource has been unloaded. More...

Static Public Member Functions
static GpuProgramPtr	_getProgramByName (const String &name, const String &group, GpuProgramType type)

Detailed Description

This class makes the usage of a vertex and fragment programs (low-level or high-level), with a given set of parameters, explicit.

Remarks

Using a vertex or fragment program can get fairly complex; besides the fairly rudimentary process of binding a program to the GPU for rendering, managing usage has few complications, such as:

• Programs can be high level (e.g. Cg, RenderMonkey) or low level (assembler). Using either should be relatively seamless, although high-level programs give you the advantage of being able to use named parameters, instead of just indexed registers
• Programs and parameters can be shared between multiple usages, in order to save memory
• When you define a user of a program, such as a material, you often want to be able to set up the definition but not load / compile / assemble the program at that stage, because it is not needed just yet. The program should be loaded when it is first needed, or earlier if specifically requested. The program may not be defined at this time, you may want to have scripts that can set up the definitions independent of the order in which those scripts are loaded.

This class packages up those details so you don't have to worry about them. For example, this class lets you define a high-level program and set up the parameters for it, without having loaded the program (which you normally could not do). When the program is loaded and compiled, this class will then validate the parameters you supplied earlier and turn them into runtime parameters.

Just incase it wasn't clear from the above, this class provides linkage to both GpuProgram and HighLevelGpuProgram, despite its name.

Constructor & Destructor Documentation

GpuProgramUsage() [1/2]

Ogre::GpuProgramUsage::GpuProgramUsage	(	GpuProgramType	gptype,
		Pass *	parent
	)

Default constructor.

Parameters

gptype

The type of program to link to

GpuProgramUsage() [2/2]

Ogre::GpuProgramUsage::GpuProgramUsage	(	const GpuProgramUsage &	rhs,
		Pass *	newparent
	)

Copy constructor.

~GpuProgramUsage()

Ogre::GpuProgramUsage::~GpuProgramUsage

(

)

Member Function Documentation

getType()

GpuProgramType Ogre::GpuProgramUsage::getType ( void  ) const

inline

Gets the type of program we're trying to link to.

setProgramName()

void Ogre::GpuProgramUsage::setProgramName	(	const String &	name,
		bool	resetParams = true
	)

Sets the name of the program to use.

Parameters

name	The name of the program to use
resetParams	If true, this will create a fresh set of parameters from the new program being linked, so if you had previously set parameters you will have to set them again. If you set this to false, you must be absolutely sure that the parameters match perfectly, and in the case of named parameters refers to the indexes underlying them, not just the names.

setProgram()

void Ogre::GpuProgramUsage::setProgram	(	const GpuProgramPtr &	prog,
		bool	resetParams = true
	)

Sets the program to use.

Remarks

Note that this will create a fresh set of parameters from the new program being linked, so if you had previously set parameters you will have to set them again.

getProgram()

const GpuProgramPtr& Ogre::GpuProgramUsage::getProgram ( ) const

inline

Gets the program being used.

getProgramName()

const String& Ogre::GpuProgramUsage::getProgramName ( void  ) const

inline

Gets the program being used.

References Ogre::Resource::getName().

setParameters()

void Ogre::GpuProgramUsage::setParameters

(

const GpuProgramParametersSharedPtr &

params

)

Sets the program parameters that should be used; because parameters can be shared between multiple usages for efficiency, this method is here for you to register externally created parameter objects.

Otherwise, the parameters will be created for you when a program is linked.

getParameters()

const GpuProgramParametersSharedPtr& Ogre::GpuProgramUsage::getParameters

(

void

)

const

Gets the parameters being used here.

_load()

void Ogre::GpuProgramUsage::_load

(

void

)

Load this usage (and ensure program is loaded)

_unload()

void Ogre::GpuProgramUsage::_unload

(

void

)

Unload this usage.

calculateSize()

size_t Ogre::GpuProgramUsage::calculateSize

(

void

)

const

unloadingComplete()

void Ogre::GpuProgramUsage::unloadingComplete ( Resource *  )

virtual

Called whenever the resource has been unloaded.

Reimplemented from Ogre::Resource::Listener.

loadingComplete()

void Ogre::GpuProgramUsage::loadingComplete ( Resource *  )

virtual

Called whenever the resource finishes loading.

Remarks

If a Resource has been marked as background loaded (

See also

Resource::setBackgroundLoaded), the call does not itself occur in the thread which is doing the loading; when loading is complete a response indicator is placed with the ResourceGroupManager, which will then be sent back to the listener as part of the application's primary frame loop thread.

Reimplemented from Ogre::Resource::Listener.

_getProgramByName()

static GpuProgramPtr Ogre::GpuProgramUsage::_getProgramByName ( const String &  name, const String &  group, GpuProgramType  type  )

static

preparingComplete()

virtual void Ogre::Resource::Listener::preparingComplete ( Resource *  )

inlinevirtualinherited

Called whenever the resource finishes preparing (paging into memory).

Remarks

If a Resource has been marked as background loaded (

See also

Resource::setBackgroundLoaded) the call does not itself occur in the thread which is doing the preparing; when preparing is complete a response indicator is placed with the ResourceGroupManager, which will then be sent back to the listener as part of the application's primary frame loop thread.

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The documentation for this class was generated from the following file:

• OgreGpuProgramUsage.h