OGRE  1.10.12 Object-Oriented Graphics Rendering Engine
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 ()

virtual void backgroundPreparingComplete (Resource *)
Callback to indicate that background preparing has completed. More...

size_t calculateSize (void) const

Gets the parameters being used here. More...

const GpuProgramPtrgetProgram () const
Gets the program being used. More...

const StringgetProgramName (void) const
Gets the program being used. More...

GpuProgramType getType (void) const
Gets the type of program we're trying to link to. More...

virtual void preparingComplete (Resource *)
Called whenever the resource finishes preparing (paging into memory). More...

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 (GpuProgramPtr &prog)
Sets the program to use. More...

void setProgramName (const String &name, bool resetParams=true)
Sets the name of the program to use. More...

Called whenever the resource has been unloaded. More...

## 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.

## ◆ 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 ( )

## ◆ 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 ( GpuProgramPtr & prog )

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 ( 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()

Gets the parameters being used here.

## ◆ calculateSize()

 size_t Ogre::GpuProgramUsage::calculateSize ( void ) const

virtual

Called whenever the resource has been unloaded.

Reimplemented from Ogre::Resource::Listener.

virtual

Remarks
If a Resource has been marked as background loaded (
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.

inlinevirtualinherited

Deprecated:

Reimplemented in Ogre::Entity.

## ◆ backgroundPreparingComplete()

 virtual void Ogre::Resource::Listener::backgroundPreparingComplete ( Resource * )
inlinevirtualinherited

Callback to indicate that background preparing has completed.

Deprecated:

## ◆ 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 (