tgui::BackendRenderTargetOpenGL3 Class Reference

Render target implementation that makes use of modern OpenGL. More...

#include <TGUI/Backend/Renderer/OpenGL3/BackendRenderTargetOpenGL3.hpp>

Inheritance diagram for tgui::BackendRenderTargetOpenGL3:

Public Member Functions
	BackendRenderTargetOpenGL3 ()
	Default constructor.
	~BackendRenderTargetOpenGL3 () override
	Destructor.
void	setClearColor (const Color &color) override
	Select the color that will be used by clearScreen. This will be called when gui.mainLoop() is called.
void	clearScreen () override
	Clears the screen, called at the beginning of each frame when gui.mainLoop() is called.
void	setView (FloatRect view, FloatRect viewport, Vector2f targetSize) override
	Informs the render target about which part of the window is used for rendering.
void	drawGui (const std::shared_ptr< RootContainer > &root) override
	Draws the gui and all of its widgets.
void	drawVertexArray (const RenderStates &states, const Vertex *vertices, std::size_t vertexCount, const unsigned int *indices, std::size_t indexCount, const std::shared_ptr< BackendTexture > &texture) override
	Draws a vertex array. This is called by the other draw functions.
Public Member Functions inherited from tgui::BackendRenderTarget
	BackendRenderTarget (const BackendRenderTarget &)=delete
	BackendRenderTarget (BackendRenderTarget &&)=delete
BackendRenderTarget &	operator= (const BackendRenderTarget &)=delete
BackendRenderTarget &	operator= (BackendRenderTarget &&)=delete
	BackendRenderTarget ()=default
	Default constructor.
virtual	~BackendRenderTarget ()=default
	Virtual destructor.
virtual void	drawWidget (const RenderStates &states, const std::shared_ptr< Widget > &widget)
	Draws a widget, if the widget is visible.
virtual void	addClippingLayer (const RenderStates &states, FloatRect rect)
	Adds another clipping region.
virtual void	removeClippingLayer ()
	Removes the last added clipping region.
virtual void	drawBorders (const RenderStates &states, const Borders &borders, Vector2f size, Color color)
	Draws borders inside a provided rectangle.
virtual void	drawFilledRect (const RenderStates &states, Vector2f size, Color color)
	Draws a colored rectangle.
virtual void	drawSprite (const RenderStates &states, const Sprite &sprite)
	Draws a texture.
virtual void	drawText (const RenderStates &states, const Text &text)
	Draws some text.
virtual void	drawTextOutline (const RenderStates &states, const Text &text)
	Draws only the outline of some text.
virtual void	drawTextWithoutOutline (const RenderStates &states, const Text &text)
	Draws some text, but without rendering its outline.
virtual void	drawTriangle (const RenderStates &states, const Vertex &point1, const Vertex &point2, const Vertex &point3)
	Draws a single triangles (using the color that is specified in the vertices)
virtual void	drawCircle (const RenderStates &states, float size, const Color &backgroundColor, float borderThickness=0, const Color &borderColor={})
	Draws a circle.
virtual void	drawRoundedRectangle (const RenderStates &states, const Vector2f &size, const Color &backgroundColor, float radius, const Borders &borders={0}, const Color &borderColor=Color::Black)
	Draws a rounded rectangle.
Vector2f	getPixelsPerPoint () const
	Returns the current mapping between the screen pixels and the points in the current view.

Protected Member Functions
void	updateClipping (FloatRect clipRect, FloatRect clipViewport) override
	Called from addClippingLayer and removeClippingLayer to apply the clipping.
void	createBuffers ()
Protected Member Functions inherited from tgui::BackendRenderTarget

Protected Attributes
unsigned int	m_shaderProgram = 0
unsigned int	m_vertexArray = 0
unsigned int	m_vertexBuffer = 0
unsigned int	m_indexBuffer = 0
std::size_t	m_vertexBufferSize = 0
std::size_t	m_indexBufferSize = 0
std::unique_ptr< BackendTextureOpenGL3 >	m_emptyTexture
std::shared_ptr< BackendTextureOpenGL3 >	m_currentTexture
Transform	m_projectionTransform
int	m_projectionMatrixShaderUniformLocation = 0
Protected Attributes inherited from tgui::BackendRenderTarget
FloatRect	m_viewRect
FloatRect	m_viewport
Vector2f	m_targetSize
std::vector< std::pair< FloatRect, FloatRect > >	m_clipLayers
Vector2f	m_pixelsPerPoint = {1, 1}

Detailed Description

Render target implementation that makes use of modern OpenGL.

Member Function Documentation

clearScreen()

void tgui::BackendRenderTargetOpenGL3::clearScreen ( )

overridevirtual

Clears the screen, called at the beginning of each frame when gui.mainLoop() is called.

Implements tgui::BackendRenderTarget.

drawGui()

void tgui::BackendRenderTargetOpenGL3::drawGui ( const std::shared_ptr< RootContainer > & root )

overridevirtual

Draws the gui and all of its widgets.

Parameters

root	Root container that holds all widgets in the gui

GL_BLEND, GL_DEPTH_TEST, GL_CULL_FACE and GL_SCISSOR_TEST are temporarily changed but restored at the end of this function

Implements tgui::BackendRenderTarget.

drawVertexArray()

void tgui::BackendRenderTargetOpenGL3::drawVertexArray ( const RenderStates & states, const Vertex * vertices, std::size_t vertexCount, const unsigned int * indices, std::size_t indexCount, const std::shared_ptr< BackendTexture > & texture )

overridevirtual

Draws a vertex array. This is called by the other draw functions.

Parameters

states	Render states to use for drawing
vertices	Pointer to first element in array of vertices
vertexCount	Amount of elements in the vertex array
indices	Pointer to first element in array of indices
indexCount	Amount of elements in the indices array
texture	Texture to use, or nullptr when drawing colored triangles

Implements tgui::BackendRenderTarget.

setClearColor()

void tgui::BackendRenderTargetOpenGL3::setClearColor ( const Color & color )

overridevirtual

Select the color that will be used by clearScreen. This will be called when gui.mainLoop() is called.

Parameters

color

Background color of the window

Implements tgui::BackendRenderTarget.

setView()

void tgui::BackendRenderTargetOpenGL3::setView ( FloatRect view, FloatRect viewport, Vector2f targetSize )

overridevirtual

Informs the render target about which part of the window is used for rendering.

Parameters

view	Defines which part of the gui is being shown
viewport	Defines which part of the window is being rendered to
targetSize	Size of the window

Reimplemented from tgui::BackendRenderTarget.

updateClipping()

void tgui::BackendRenderTargetOpenGL3::updateClipping ( FloatRect clipRect, FloatRect clipViewport )

overrideprotectedvirtual

Called from addClippingLayer and removeClippingLayer to apply the clipping.

Parameters

clipRect	View rectangle to apply
clipViewport	Viewport to apply

Both rectangles may be empty when nothing that will be drawn is going to be visible.

Implements tgui::BackendRenderTarget.

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

• include/TGUI/Backend/Renderer/OpenGL3/BackendRenderTargetOpenGL3.hpp