Crazy Eddies GUI System 0.7.5
Public Member Functions | Protected Member Functions | Protected Attributes | Static Protected Attributes
CEGUI::OpenGLRenderTarget Class Reference

Intermediate OpenGL implementation of a RenderTarget. More...

Inheritance diagram for CEGUI::OpenGLRenderTarget:
Collaboration diagram for CEGUI::OpenGLRenderTarget:

List of all members.

Public Member Functions

 OpenGLRenderTarget (OpenGLRenderer &owner)
 Constructor.
void draw (const GeometryBuffer &buffer)
 Draw geometry from the given GeometryBuffer onto the surface that this RenderTarget represents.
void draw (const RenderQueue &queue)
 Draw geometry from the given RenderQueue onto the surface that this RenderTarget represents.
void setArea (const Rect &area)
 Set the area for this RenderTarget. The exact action this function will take depends upon what the concrete class is representing. For example, with a 'view port' style RenderTarget, this should set the area that the view port occupies on the display (or rendering window).
const RectgetArea () const
 Return the area defined for this RenderTarget.
void activate ()
 Activate the render target and put it in a state ready to be drawn to.
void deactivate ()
 Deactivate the render target after having completed rendering.
void unprojectPoint (const GeometryBuffer &buff, const Vector2 &p_in, Vector2 &p_out) const
 Take point p_in unproject it and put the result in p_out. Resulting point is local to GeometryBuffer buff.

Protected Member Functions

virtual void updateMatrix () const
 helper that initialises the cached matrix

Protected Attributes

OpenGLRendererd_owner
 OpenGLRenderer that created this object.
Rect d_area
 holds defined area for the RenderTarget
double d_matrix [16]
 saved copy of projection matrix
bool d_matrixValid
 true if saved matrix is up to date
double d_viewDistance
 tracks viewing distance (this is set up at the same time as d_matrix)

Static Protected Attributes

static const double d_yfov_tan
 tangent of the y FOV half-angle; used to calculate viewing distance.

Detailed Description

Intermediate OpenGL implementation of a RenderTarget.


Member Function Documentation

void CEGUI::OpenGLRenderTarget::activate ( ) [virtual]

Activate the render target and put it in a state ready to be drawn to.

Note:
You MUST call this before doing any rendering - if you do not call this, in the unlikely event that your application actually works, it will likely stop working in some future version.

Implements CEGUI::RenderTarget.

Reimplemented in CEGUI::OpenGLApplePBTextureTarget, CEGUI::OpenGLFBOTextureTarget, CEGUI::OpenGLGLXPBTextureTarget, and CEGUI::OpenGLWGLPBTextureTarget.

void CEGUI::OpenGLRenderTarget::deactivate ( ) [virtual]

Deactivate the render target after having completed rendering.

Note:
You MUST call this after you finish rendering to the target - if you do not call this, in the unlikely event that your application actually works, it will likely stop working in some future version.

Implements CEGUI::RenderTarget.

Reimplemented in CEGUI::OpenGLApplePBTextureTarget, CEGUI::OpenGLFBOTextureTarget, CEGUI::OpenGLGLXPBTextureTarget, and CEGUI::OpenGLWGLPBTextureTarget.

void CEGUI::OpenGLRenderTarget::draw ( const GeometryBuffer buffer) [virtual]

Draw geometry from the given GeometryBuffer onto the surface that this RenderTarget represents.

Parameters:
bufferGeometryBuffer object holding the geometry that should be drawn to the RenderTarget.

Implements CEGUI::RenderTarget.

void CEGUI::OpenGLRenderTarget::draw ( const RenderQueue queue) [virtual]

Draw geometry from the given RenderQueue onto the surface that this RenderTarget represents.

Parameters:
queueRenderQueue object holding the geometry that should be drawn to the RenderTarget.

Implements CEGUI::RenderTarget.

const Rect& CEGUI::OpenGLRenderTarget::getArea ( ) const [virtual]

Return the area defined for this RenderTarget.

Returns:
Rect object describing the currently defined area for this RenderTarget.

Implements CEGUI::RenderTarget.

void CEGUI::OpenGLRenderTarget::setArea ( const Rect area) [virtual]

Set the area for this RenderTarget. The exact action this function will take depends upon what the concrete class is representing. For example, with a 'view port' style RenderTarget, this should set the area that the view port occupies on the display (or rendering window).

Parameters:
areaRect object describing the new area to be assigned to the RenderTarget.
Exceptions:
InvalidRequestExceptionMay be thrown if the RenderTarget does not support setting or changing its area, or if the area change can not be satisfied for some reason.

Implements CEGUI::RenderTarget.