sf::RenderTexture Class Reference

Target for off-screen 2D rendering into a texture. More...

#include <RenderTexture.hpp>

Inheritance diagram for sf::RenderTexture:

Public Member Functions
	RenderTexture ()
	Default constructor.
	RenderTexture (Vector2u size, const ContextSettings &settings={})
	Construct a render-texture.
	~RenderTexture () override
	Destructor.
	RenderTexture (const RenderTexture &)=delete
	Deleted copy constructor.
RenderTexture &	operator= (const RenderTexture &)=delete
	Deleted copy assignment.
	RenderTexture (RenderTexture &&) noexcept
	Move constructor.
RenderTexture &	operator= (RenderTexture &&) noexcept
	Move assignment operator.
bool	resize (Vector2u size, const ContextSettings &settings={})
	Resize the render-texture.
void	setSmooth (bool smooth)
	Enable or disable texture smoothing.
bool	isSmooth () const
	Tell whether the smooth filtering is enabled or not.
void	setRepeated (bool repeated)
	Enable or disable texture repeating.
bool	isRepeated () const
	Tell whether the texture is repeated or not.
bool	generateMipmap ()
	Generate a mipmap using the current texture data.
bool	setActive (bool active=true) override
	Activate or deactivate the render-texture for rendering.
void	display ()
	Update the contents of the target texture.
Vector2u	getSize () const override
	Return the size of the rendering region of the texture.
bool	isSrgb () const override
	Tell if the render-texture will use sRGB encoding when drawing on it.
const Texture &	getTexture () const
	Get a read-only reference to the target texture.
Public Member Functions inherited from sf::RenderTarget
virtual	~RenderTarget ()=default
	Destructor.
	RenderTarget (const RenderTarget &)=delete
	Deleted copy constructor.
RenderTarget &	operator= (const RenderTarget &)=delete
	Deleted copy assignment.
	RenderTarget (RenderTarget &&) noexcept=default
	Move constructor.
RenderTarget &	operator= (RenderTarget &&) noexcept=default
	Move assignment.
void	clear (Color color=Color::Black)
	Clear the entire target with a single color.
void	clearStencil (StencilValue stencilValue)
	Clear the stencil buffer to a specific value.
void	clear (Color color, StencilValue stencilValue)
	Clear the entire target with a single color and stencil value.
void	setView (const View &view)
	Change the current active view.
const View &	getView () const
	Get the view currently in use in the render target.
const View &	getDefaultView () const
	Get the default view of the render target.
IntRect	getViewport (const View &view) const
	Get the viewport of a view, applied to this render target.
IntRect	getScissor (const View &view) const
	Get the scissor rectangle of a view, applied to this render target.
Vector2f	mapPixelToCoords (Vector2i point) const
	Convert a point from target coordinates to world coordinates, using the current view.
Vector2f	mapPixelToCoords (Vector2i point, const View &view) const
	Convert a point from target coordinates to world coordinates.
Vector2i	mapCoordsToPixel (Vector2f point) const
	Convert a point from world coordinates to target coordinates, using the current view.
Vector2i	mapCoordsToPixel (Vector2f point, const View &view) const
	Convert a point from world coordinates to target coordinates.
void	draw (const Drawable &drawable, const RenderStates &states=RenderStates::Default)
	Draw a drawable object to the render target.
void	draw (const Vertex *vertices, std::size_t vertexCount, PrimitiveType type, const RenderStates &states=RenderStates::Default)
	Draw primitives defined by an array of vertices.
void	draw (const VertexBuffer &vertexBuffer, const RenderStates &states=RenderStates::Default)
	Draw primitives defined by a vertex buffer.
void	draw (const VertexBuffer &vertexBuffer, std::size_t firstVertex, std::size_t vertexCount, const RenderStates &states=RenderStates::Default)
	Draw primitives defined by a vertex buffer.
void	pushGLStates ()
	Save the current OpenGL render states and matrices.
void	popGLStates ()
	Restore the previously saved OpenGL render states and matrices.
void	resetGLStates ()
	Reset the internal OpenGL states so that the target is ready for drawing.

Static Public Member Functions
static unsigned int	getMaximumAntialiasingLevel ()
	Get the maximum anti-aliasing level supported by the system.

Additional Inherited Members
Protected Member Functions inherited from sf::RenderTarget
	RenderTarget ()=default
	Default constructor.
void	initialize ()
	Performs the common initialization step after creation.

Detailed Description

Target for off-screen 2D rendering into a texture.

sf::RenderTexture is the little brother of sf::RenderWindow. It implements the same 2D drawing and OpenGL-related functions (see their base class sf::RenderTarget for more details), the difference is that the result is stored in an off-screen texture rather than being show in a window.

Rendering to a texture can be useful in a variety of situations:

• precomputing a complex static texture (like a level's background from multiple tiles)
• applying post-effects to the whole scene with shaders
• creating a sprite from a 3D object rendered with OpenGL
• etc.

Usage example:

// Create a new render-window
sf::RenderWindow window(sf::VideoMode({800, 600}), "SFML window");
 
// Create a new render-texture
sf::RenderTexture texture({500, 500});
 
// The main loop
while (window.isOpen())
{
   // Event processing
   // ...
 
   // Clear the whole texture with red color
   texture.clear(sf::Color::Red);
 
   // Draw stuff to the texture
   texture.draw(sprite);  // sprite is a sf::Sprite
   texture.draw(shape);   // shape is a sf::Shape
   texture.draw(text);    // text is a sf::Text
 
   // We're done drawing to the texture
   texture.display();
 
   // Now we start rendering to the window, clear it first
   window.clear();
 
   // Draw the texture
   sf::Sprite sprite(texture.getTexture());
   window.draw(sprite);
 
   // End the current frame and display its contents on screen
   window.display();
}

Like sf::RenderWindow, sf::RenderTexture is still able to render direct OpenGL stuff. It is even possible to mix together OpenGL calls and regular SFML drawing commands. If you need a depth buffer for 3D rendering, don't forget to request it when calling RenderTexture::create.

See also

sf::RenderTarget, sf::RenderWindow, sf::View, sf::Texture

Constructor & Destructor Documentation

RenderTexture() [1/4]

sf::RenderTexture::RenderTexture

(

)

Default constructor.

Constructs a render-texture with width 0 and height 0.

See also

resize

RenderTexture() [2/4]

sf::RenderTexture::RenderTexture	(	Vector2u	size,
		const ContextSettings &	settings = {} )

Construct a render-texture.

The last parameter, settings, is useful if you want to enable multi-sampling or use the render-texture for OpenGL rendering that requires a depth or stencil buffer. Otherwise it is unnecessary, and you should leave this parameter at its default value.

After creation, the contents of the render-texture are undefined. Call RenderTexture::clear first to ensure a single color fill.

Parameters

size	Width and height of the render-texture
settings	Additional settings for the underlying OpenGL texture and context

Exceptions

`sf::Exception`

if creation was unsuccessful

~RenderTexture()

sf::RenderTexture::~RenderTexture ( )

override

Destructor.

RenderTexture() [3/4]

sf::RenderTexture::RenderTexture ( const RenderTexture & )

delete

Deleted copy constructor.

RenderTexture() [4/4]

sf::RenderTexture::RenderTexture ( RenderTexture && )

noexcept

Move constructor.

Member Function Documentation

display()

void sf::RenderTexture::display

(

)

Update the contents of the target texture.

This function updates the target texture with what has been drawn so far. Like for windows, calling this function is mandatory at the end of rendering. Not calling it may leave the texture in an undefined state.

generateMipmap()

bool sf::RenderTexture::generateMipmap ( )

nodiscard

Generate a mipmap using the current texture data.

This function is similar to Texture::generateMipmap and operates on the texture used as the target for drawing. Be aware that any draw operation may modify the base level image data. For this reason, calling this function only makes sense after all drawing is completed and display has been called. Not calling display after subsequent drawing will lead to undefined behavior if a mipmap had been previously generated.

Returns

True if mipmap generation was successful, false if unsuccessful

getMaximumAntialiasingLevel()

unsigned int sf::RenderTexture::getMaximumAntialiasingLevel ( )

staticnodiscard

Get the maximum anti-aliasing level supported by the system.

Returns

The maximum anti-aliasing level supported by the system

getSize()

Vector2u sf::RenderTexture::getSize ( ) const

nodiscardoverridevirtual

Return the size of the rendering region of the texture.

The returned value is the size that you passed to the create function.

Returns

Size in pixels

Implements sf::RenderTarget.

getTexture()

const Texture & sf::RenderTexture::getTexture ( ) const

nodiscard

Get a read-only reference to the target texture.

After drawing to the render-texture and calling Display, you can retrieve the updated texture using this function, and draw it using a sprite (for example). The internal sf::Texture of a render-texture is always the same instance, so that it is possible to call this function once and keep a reference to the texture even after it is modified.

Returns

Const reference to the texture

isRepeated()

bool sf::RenderTexture::isRepeated ( ) const

nodiscard

Tell whether the texture is repeated or not.

Returns

True if texture is repeated

See also

setRepeated

isSmooth()

bool sf::RenderTexture::isSmooth ( ) const

nodiscard

Tell whether the smooth filtering is enabled or not.

Returns

True if texture smoothing is enabled

See also

setSmooth

isSrgb()

bool sf::RenderTexture::isSrgb ( ) const

nodiscardoverridevirtual

Tell if the render-texture will use sRGB encoding when drawing on it.

You can request sRGB encoding for a render-texture by having the sRgbCapable flag set for the context parameter of create() method

Returns

True if the render-texture use sRGB encoding, false otherwise

Reimplemented from sf::RenderTarget.

operator=() [1/2]

RenderTexture & sf::RenderTexture::operator= ( const RenderTexture & )

delete

Deleted copy assignment.

operator=() [2/2]

RenderTexture & sf::RenderTexture::operator= ( RenderTexture && )

noexcept

Move assignment operator.

resize()

bool sf::RenderTexture::resize ( Vector2u size, const ContextSettings & settings = {} )

nodiscard

Resize the render-texture.

The last parameter, settings, is useful if you want to enable multi-sampling or use the render-texture for OpenGL rendering that requires a depth or stencil buffer. Otherwise it is unnecessary, and you should leave this parameter at its default value.

After resizing, the contents of the render-texture are undefined. Call RenderTexture::clear first to ensure a single color fill.

Parameters

size	Width and height of the render-texture
settings	Additional settings for the underlying OpenGL texture and context

Returns

True if resizing has been successful, false if it failed

setActive()

bool sf::RenderTexture::setActive ( bool active = true )

nodiscardoverridevirtual

Activate or deactivate the render-texture for rendering.

This function makes the render-texture's context current for future OpenGL rendering operations (so you shouldn't care about it if you're not doing direct OpenGL stuff). Only one context can be current in a thread, so if you want to draw OpenGL geometry to another render target (like a RenderWindow) don't forget to activate it again.

Parameters

active

True to activate, false to deactivate

Returns

True if operation was successful, false otherwise

Reimplemented from sf::RenderTarget.

setRepeated()

void sf::RenderTexture::setRepeated

(

bool

repeated

)

Enable or disable texture repeating.

This function is similar to Texture::setRepeated. This parameter is disabled by default.

Parameters

repeated

True to enable repeating, false to disable it

See also

isRepeated

setSmooth()

void sf::RenderTexture::setSmooth

(

bool

smooth

)

Enable or disable texture smoothing.

This function is similar to Texture::setSmooth. This parameter is disabled by default.

Parameters

smooth

True to enable smoothing, false to disable it

See also

isSmooth

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

• SFML/Graphics/RenderTexture.hpp