OGRE  14.2
Object-Oriented Graphics Rendering Engine
Ogre::Viewport Class Reference

An abstraction of a viewport, i.e. More...

#include <OgreViewport.h>

+ Inheritance diagram for Ogre::Viewport:

Classes

class  Listener
 Listener interface so you can be notified of Viewport changes. More...
 

Public Member Functions

 Viewport (Camera *camera, RenderTarget *target, float left, float top, float width, float height, int ZOrder)
 The usual constructor. More...
 
virtual ~Viewport ()
 Default destructor. More...
 
void _clearUpdatedFlag (void)
 
unsigned int _getNumRenderedBatches (void) const
 Gets the number of rendered batches in the last update. More...
 
unsigned int _getNumRenderedFaces (void) const
 Gets the number of rendered faces in the last update. More...
 
bool _isUpdated (void) const
 
void _updateDimensions (void)
 Notifies the viewport of a possible change in dimensions. More...
 
void addListener (Listener *l)
 Add a listener to this viewport. More...
 
void clear (uint32 buffers=FBT_COLOUR|FBT_DEPTH, const ColourValue &colour=ColourValue::Black, float depth=1.0f, uint16 stencil=0)
 Instructs the viewport to clear itself, without performing an update. More...
 
Rect getActualDimensions () const
 Access to actual dimensions (based on target size). More...
 
void getActualDimensions (int &left, int &top, int &width, int &height) const
 
int getActualHeight (void) const
 Gets one of the actual dimensions of the viewport, a value in pixels. More...
 
int getActualLeft (void) const
 Gets one of the actual dimensions of the viewport, a value in pixels. More...
 
int getActualTop (void) const
 Gets one of the actual dimensions of the viewport, a value in pixels. More...
 
int getActualWidth (void) const
 Gets one of the actual dimensions of the viewport, a value in pixels. More...
 
const ColourValuegetBackgroundColour (void) const
 Gets the background colour. More...
 
CameragetCamera (void) const
 Retrieves a pointer to the camera for this viewport. More...
 
unsigned int getClearBuffers (void) const
 Gets which buffers are to be cleared each frame. More...
 
bool getClearEveryFrame (void) const
 Determines if the viewport is cleared before every frame. More...
 
float getDepthClear (void) const
 Gets the default depth buffer value to which the viewport is cleared. More...
 
ColourBufferType getDrawBuffer () const
 Returns the current colour buffer type for this viewport. More...
 
float getHeight (void) const
 Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0. More...
 
float getLeft (void) const
 Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0. More...
 
const StringgetMaterialScheme (void) const
 Get the material scheme which the viewport should use. More...
 
bool getOverlaysEnabled (void) const
 Returns whether or not Overlay objects (created in the SceneManager) are displayed in this viewport. More...
 
bool getShadowsEnabled (void) const
 Returns whether or not shadows (defined in the SceneManager) are displayed in this viewport. More...
 
bool getSkiesEnabled (void) const
 Returns whether or not skies (created in the SceneManager) are displayed in this viewport. More...
 
RenderTargetgetTarget (void) const
 Retrieves a pointer to the render target for this viewport. More...
 
float getTop (void) const
 Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0. More...
 
uint getVisibilityMask (void) const
 Gets a per-viewport visibility mask. More...
 
float getWidth (void) const
 Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0. More...
 
int getZOrder (void) const
 Gets the Z-Order of this viewport. More...
 
bool isAutoUpdated () const
 Gets whether this viewport is automatically updated if Ogre's rendering loop or RenderTarget::update is being used. More...
 
void removeListener (Listener *l)
 Remove a listener to this viewport. More...
 
void setAutoUpdated (bool autoupdate)
 Sets whether this viewport should be automatically updated if Ogre's rendering loop or RenderTarget::update is being used. More...
 
void setBackgroundColour (const ColourValue &colour)
 Sets the initial background colour of the viewport (before rendering). More...
 
void setCamera (Camera *cam)
 Sets the camera to use for rendering to this viewport. More...
 
void setClearEveryFrame (bool clear, unsigned int buffers=FBT_COLOUR|FBT_DEPTH)
 Determines whether to clear the viewport before rendering. More...
 
void setDepthClear (float depth)
 Sets the initial depth buffer value of the viewport (before rendering). More...
 
void setDimensions (float left, float top, float width, float height)
 Sets the dimensions (after creation). More...
 
void setDrawBuffer (ColourBufferType colourBuffer)
 Sets the draw buffer type for the next frame. More...
 
void setMaterialScheme (const String &schemeName)
 Set the material scheme which the viewport should use. More...
 
void setOverlaysEnabled (bool enabled)
 Tells this viewport whether it should display Overlay objects. More...
 
void setShadowsEnabled (bool enabled)
 Tells this viewport whether it should display shadows. More...
 
void setSkiesEnabled (bool enabled)
 Tells this viewport whether it should display skies. More...
 
void setVisibilityMask (uint32 mask)
 Sets a per-viewport visibility mask. More...
 
void update (void)
 Instructs the viewport to updates its contents. More...
 

Detailed Description

An abstraction of a viewport, i.e.

a rendering region on a render target.

A viewport is the meeting of a camera and a rendering surface -
the camera renders the scene from a viewpoint, and places its
results into some subset of a rendering target, which may be the
whole surface or just a part of the surface. Each viewport has a
single camera as source and a single target as destination. A
camera only has 1 viewport, but a render target may have several.
A viewport also has a Z-order, i.e. if there is more than one
viewport on a single render target and they overlap, one must
obscure the other in some predetermined way.

Constructor & Destructor Documentation

◆ Viewport()

Ogre::Viewport::Viewport ( Camera camera,
RenderTarget target,
float  left,
float  top,
float  width,
float  height,
int  ZOrder 
)

The usual constructor.

Parameters
cameraPointer to a camera to be the source for the image.
targetPointer to the render target to be the destination for the rendering.
left,top,width,heightDimensions of the viewport, expressed as a value between 0 and 1. This allows the dimensions to apply irrespective of changes in the target's size: e.g. to fill the whole area, values of 0,0,1,1 are appropriate.
ZOrderRelative Z-order on the target. Lower = further to the front.

◆ ~Viewport()

virtual Ogre::Viewport::~Viewport ( )
virtual

Default destructor.

Member Function Documentation

◆ _updateDimensions()

void Ogre::Viewport::_updateDimensions ( void  )

Notifies the viewport of a possible change in dimensions.

Used by the target to update the viewport's dimensions
(usually the result of a change in target size).
Note
Internal use by Ogre only.

◆ update()

void Ogre::Viewport::update ( void  )

Instructs the viewport to updates its contents.

◆ clear()

void Ogre::Viewport::clear ( uint32  buffers = FBT_COLOUR|FBT_DEPTH,
const ColourValue colour = ColourValue::Black,
float  depth = 1.0f,
uint16  stencil = 0 
)

Instructs the viewport to clear itself, without performing an update.

You would not normally call this method when updating the viewport, since the viewport usually clears itself when updating anyway (

See also
Viewport::setClearEveryFrame). However, if you wish you have the option of manually clearing the frame buffer (or elements of it) using this method.
Parameters
buffersBitmask identifying which buffer elements to clear
colourThe colour value to clear to, if FBT_COLOUR is included
depthThe depth value to clear to, if FBT_DEPTH is included
stencilThe stencil value to clear to, if FBT_STENCIL is included

◆ getTarget()

RenderTarget* Ogre::Viewport::getTarget ( void  ) const
inline

Retrieves a pointer to the render target for this viewport.

◆ getCamera()

Camera* Ogre::Viewport::getCamera ( void  ) const
inline

Retrieves a pointer to the camera for this viewport.

◆ setCamera()

void Ogre::Viewport::setCamera ( Camera cam)

Sets the camera to use for rendering to this viewport.

◆ getZOrder()

int Ogre::Viewport::getZOrder ( void  ) const
inline

Gets the Z-Order of this viewport.

◆ getLeft()

float Ogre::Viewport::getLeft ( void  ) const
inline

Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0.

◆ getTop()

float Ogre::Viewport::getTop ( void  ) const
inline

Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0.

◆ getWidth()

float Ogre::Viewport::getWidth ( void  ) const
inline

Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0.

◆ getHeight()

float Ogre::Viewport::getHeight ( void  ) const
inline

Gets one of the relative dimensions of the viewport, a value between 0.0 and 1.0.

◆ getActualLeft()

int Ogre::Viewport::getActualLeft ( void  ) const
inline

Gets one of the actual dimensions of the viewport, a value in pixels.

◆ getActualTop()

int Ogre::Viewport::getActualTop ( void  ) const
inline

Gets one of the actual dimensions of the viewport, a value in pixels.

◆ getActualWidth()

int Ogre::Viewport::getActualWidth ( void  ) const
inline

Gets one of the actual dimensions of the viewport, a value in pixels.

◆ getActualHeight()

int Ogre::Viewport::getActualHeight ( void  ) const
inline

Gets one of the actual dimensions of the viewport, a value in pixels.

◆ setDimensions()

void Ogre::Viewport::setDimensions ( float  left,
float  top,
float  width,
float  height 
)

Sets the dimensions (after creation).

Parameters
leftLeft point of viewport.
topTop point of the viewport.
widthWidth of the viewport.
heightHeight of the viewport.
Note
Dimensions relative to the size of the target, represented as real values between 0 and 1. i.e. the full target area is 0, 0, 1, 1.

◆ setBackgroundColour()

void Ogre::Viewport::setBackgroundColour ( const ColourValue colour)
inline

Sets the initial background colour of the viewport (before rendering).

◆ getBackgroundColour()

const ColourValue& Ogre::Viewport::getBackgroundColour ( void  ) const
inline

Gets the background colour.

◆ setDepthClear()

void Ogre::Viewport::setDepthClear ( float  depth)
inline

Sets the initial depth buffer value of the viewport (before rendering).

Default is 1

◆ getDepthClear()

float Ogre::Viewport::getDepthClear ( void  ) const
inline

Gets the default depth buffer value to which the viewport is cleared.

◆ setClearEveryFrame()

void Ogre::Viewport::setClearEveryFrame ( bool  clear,
unsigned int  buffers = FBT_COLOUR|FBT_DEPTH 
)

Determines whether to clear the viewport before rendering.

You can use this method to set which buffers are cleared (if any) before rendering every frame.

Parameters
clearWhether or not to clear any buffers
buffersOne or more values from FrameBufferType denoting which buffers to clear, if clear is set to true. Note you should not clear the stencil buffer here unless you know what you're doing.

◆ getClearEveryFrame()

bool Ogre::Viewport::getClearEveryFrame ( void  ) const
inline

Determines if the viewport is cleared before every frame.

◆ getClearBuffers()

unsigned int Ogre::Viewport::getClearBuffers ( void  ) const
inline

Gets which buffers are to be cleared each frame.

◆ setAutoUpdated()

void Ogre::Viewport::setAutoUpdated ( bool  autoupdate)
inline

Sets whether this viewport should be automatically updated if Ogre's rendering loop or RenderTarget::update is being used.

By default, if you use Ogre's own rendering loop (Root::startRendering) or call RenderTarget::update, all viewports are updated automatically. This method allows you to control that behaviour, if for example you have a viewport which you only want to update periodically.

Parameters
autoupdateIf true, the viewport is updated during the automatic render loop or when RenderTarget::update() is called. If false, the viewport is only updated when its update() method is called explicitly.

◆ isAutoUpdated()

bool Ogre::Viewport::isAutoUpdated ( ) const
inline

Gets whether this viewport is automatically updated if Ogre's rendering loop or RenderTarget::update is being used.

◆ setMaterialScheme()

void Ogre::Viewport::setMaterialScheme ( const String schemeName)
inline

Set the material scheme which the viewport should use.

This allows you to tell the system to use a particular material scheme when rendering this viewport, which can involve using different techniques to render your materials.

See also
Technique::setSchemeName

◆ getMaterialScheme()

const String& Ogre::Viewport::getMaterialScheme ( void  ) const
inline

Get the material scheme which the viewport should use.

◆ getActualDimensions() [1/2]

Rect Ogre::Viewport::getActualDimensions ( ) const
inline

Access to actual dimensions (based on target size).

◆ getActualDimensions() [2/2]

void Ogre::Viewport::getActualDimensions ( int &  left,
int &  top,
int &  width,
int &  height 
) const

◆ _isUpdated()

bool Ogre::Viewport::_isUpdated ( void  ) const

◆ _clearUpdatedFlag()

void Ogre::Viewport::_clearUpdatedFlag ( void  )

◆ _getNumRenderedFaces()

unsigned int Ogre::Viewport::_getNumRenderedFaces ( void  ) const

Gets the number of rendered faces in the last update.

◆ _getNumRenderedBatches()

unsigned int Ogre::Viewport::_getNumRenderedBatches ( void  ) const

Gets the number of rendered batches in the last update.

◆ setOverlaysEnabled()

void Ogre::Viewport::setOverlaysEnabled ( bool  enabled)
inline

Tells this viewport whether it should display Overlay objects.

Overlay objects are layers which appear on top of the scene. They are created via SceneManager::createOverlay and every viewport displays these by default. However, you probably don't want this if you're using multiple viewports, because one of them is probably a picture-in-picture which is not supposed to have overlays of it's own. In this case you can turn off overlays on this viewport by calling this method.

Parameters
enabledIf true, any overlays are displayed, if false they are not.

◆ getOverlaysEnabled()

bool Ogre::Viewport::getOverlaysEnabled ( void  ) const
inline

Returns whether or not Overlay objects (created in the SceneManager) are displayed in this viewport.

◆ setSkiesEnabled()

void Ogre::Viewport::setSkiesEnabled ( bool  enabled)
inline

Tells this viewport whether it should display skies.

Skies are layers which appear on background of the scene. They are created via SceneManager::setSkyBox, SceneManager::setSkyPlane and SceneManager::setSkyDome and every viewport displays these by default. However, you probably don't want this if you're using multiple viewports, because one of them is probably a picture-in-picture which is not supposed to have skies of it's own. In this case you can turn off skies on this viewport by calling this method.

Parameters
enabledIf true, any skies are displayed, if false they are not.

◆ getSkiesEnabled()

bool Ogre::Viewport::getSkiesEnabled ( void  ) const
inline

Returns whether or not skies (created in the SceneManager) are displayed in this viewport.

◆ setShadowsEnabled()

void Ogre::Viewport::setShadowsEnabled ( bool  enabled)
inline

Tells this viewport whether it should display shadows.

This setting enables you to disable shadow rendering for a given viewport. The global shadow technique set on SceneManager still controls the type and nature of shadows, but this flag can override the setting so that no shadows are rendered for a given viewport to save processing time where they are not required.

Parameters
enabledIf true, any shadows are displayed, if false they are not.

◆ getShadowsEnabled()

bool Ogre::Viewport::getShadowsEnabled ( void  ) const
inline

Returns whether or not shadows (defined in the SceneManager) are displayed in this viewport.

◆ setVisibilityMask()

void Ogre::Viewport::setVisibilityMask ( uint32  mask)
inline

Sets a per-viewport visibility mask.

The visibility mask is a way to exclude objects from rendering for a given viewport. For each object in the frustum, a check is made between this mask and the objects visibility flags (

See also
MovableObject::setVisibilityFlags), and if a binary 'and' returns zero, the object will not be rendered.

◆ getVisibilityMask()

uint Ogre::Viewport::getVisibilityMask ( void  ) const
inline

Gets a per-viewport visibility mask.

See also
Viewport::setVisibilityMask

◆ addListener()

void Ogre::Viewport::addListener ( Listener l)

Add a listener to this viewport.

◆ removeListener()

void Ogre::Viewport::removeListener ( Listener l)

Remove a listener to this viewport.

◆ setDrawBuffer()

void Ogre::Viewport::setDrawBuffer ( ColourBufferType  colourBuffer)
inline

Sets the draw buffer type for the next frame.

Specifies the particular buffer that will be targeted by the render target. Should be used if the render target supports quad buffer stereo. If the render target does not support stereo (ie. left and right), then only back and front will be used.

Parameters
colourBufferSpecifies the particular buffer that will be targeted by the render target.

◆ getDrawBuffer()

ColourBufferType Ogre::Viewport::getDrawBuffer ( ) const
inline

Returns the current colour buffer type for this viewport.


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