Represents an OpenGL context, possibly a widget or a pbuffer, which can also respond to keyboard, mouse or system events. More...

#include <OpenGLContext.hpp>

Inheritance diagram for vl::OpenGLContext:

List of all members.

Classes
struct	VertexArrayInfo
Public Member Functions
virtual const char *	className ()
	Returns the name of the class.
	OpenGLContext (int w=0, int h=0)
	Constructor.
	~OpenGLContext ()
	Destructor.
virtual void	swapBuffers ()=0
	Swaps the back and front buffers to present the last rendering.
virtual void	makeCurrent ()=0
	Sets the OpenGL context as current for the calling thread.
void	initGLContext (bool log=true)
	Initializes the supported OpenGL extensions.
void	logOpenGLInfo ()
	Logs some information about the OpenGL context.
bool	isExtensionSupported (const char *ext_name)
	Returns true if the given extension is supported.
void *	getProcAddress (const char *function_name)
	Returns the address of an OpenGL extension function.
RenderTarget *	renderTarget ()
	The render target representing this OpenGL context.
const RenderTarget *	renderTarget () const
	The render target representing this OpenGL context.
ref< FBORenderTarget >	createFBORenderTarget (int width, int height)
	Creates a new FBORenderTarget (framebuffer object RenderTarget).
ref< FBORenderTarget >	createFBORenderTarget ()
	Equivalent to `"createFBORenderTarget(0,0);"`.
void	destroyFBORenderTarget (FBORenderTarget *fbort)
	Destroyes the specified FBORenderTarget.
void	destroyAllFBORenderTargets ()
	Removes all FBORenderTargets belonging to an OpenGLContext.
virtual void	quitApplication ()
	Asks to the windowing system that is managing the OpenGLContext to quit the application.
virtual void	destroy ()
	This function should be appropriately reimplemented in all the subclasses of OpenGLContext.
virtual void	update ()
	If the OpenGLContext is a widget this function requests a redraw.
virtual void	setWindowTitle (const String &)
	If the OpenGL context is a top window this function sets its title.
virtual bool	setFullscreen (bool)
	If the OpenGL context is a widget this function requests a maximization to fullscreen.
virtual bool	fullscreen () const
	If the OpenGL context is a widget this function returns whether it has been maximized to fullscreen.
virtual void	show ()
	If the OpenGL context is a widget this function makes it visible to the user.
virtual void	hide ()
	If the OpenGL context is a widget this function makes it invisible to the user.
virtual void	setPosition (int, int)
	If the OpenGL context is a widget this function sets its position.
virtual ivec2	position () const
	If the OpenGL context is a widget this function returns its position.
virtual void	setSize (int, int)
	If the OpenGL context is a widget this function sets its size.
int	width () const
	Returns the width in pixels of an OpenGLContext.
int	height () const
	Returns the height in pixels of an OpenGLContext.
virtual void	setMouseVisible (bool)
	If the OpenGL context is a widget this function sets whether the mouse is visible over it or not.
virtual bool	mouseVisible () const
	If the OpenGL context is a widget this function returns whether the mouse is visible over it or not.
virtual void	setMousePosition (int, int)
	If the OpenGL context is a widget this function sets the mouse position.
virtual void	getFocus ()
	If the OpenGL context is a widget this function requests the mouse focus on it.
void	setVSyncEnabled (bool enable)
	If the OpenGL context is a widget this function enabled/disables double buffer swapping to the monitor's vertical synch.
bool	vsyncEnabled () const
	If the OpenGL context is a widget this function returns whether vsync is enabled or not.
virtual void	setContinuousUpdate (bool continuous)
	If the OpenGL context is a widget this function sets whether its area is continuously updated at each frame.
bool	continuousUpdate () const
	If the OpenGL context is a widget this function returns whether its area is continuously updated at each frame.
void	addEventListener (UIEventListener *el)
	Adds an UIEventListener to be notified of OpenGLContext related events.
void	removeEventListener (UIEventListener *el)
	Removes an UIEventListener.
void	eraseAllEventListeners ()
	Removes all UIEventListener previously registered.
const std::vector< ref < UIEventListener > > &	eventListeners () const
	The currently UIEventListener registered to be notified of OpenGLContext related events.
UIEventListener *	eventListener (int i) const
	Returns the `i-th` UIEventListener registered to an OpenGLContext.
int	eventListenerCount () const
	Returns the number of UIEventListener registered to an OpenGLContext.
const OpenGLContextFormat &	openglContextInfo () const
	Returns an OpenGLContextFormat structure describing an OpenGLContext.
void	setOpenGLContextInfo (const OpenGLContextFormat &info)
	Sets the OpenGLContextFormat associated to an OpenGLContext.
void	ignoreNextMouseMoveEvent ()
	Requests not to dispatch the next mouse move event.
void	dispatchResizeEvent (int w, int h)
	Dispatches the UIEventListener::resizeEvent() notification to the subscribed UIEventListener objects.
void	dispatchMouseMoveEvent (int x, int y)
	Dispatches the UIEventListener::mouseMoveEvent() notification to the subscribed UIEventListener objects.
void	dispatchMouseUpEvent (EMouseButton button, int x, int y)
	Dispatches the UIEventListener::mouseUpEvent() notification to the subscribed UIEventListener objects.
void	dispatchMouseDownEvent (EMouseButton button, int x, int y)
	Dispatches the UIEventListener::mouseDownEvent() notification to the subscribed UIEventListener objects.
void	dispatchMouseWheelEvent (int n)
	Dispatches the UIEventListener::mouseWheelEvent() notification to the subscribed UIEventListener objects.
void	dispatchKeyPressEvent (unsigned short unicode_ch, EKey key)
	Dispatches the UIEventListener::keyPressEvent() notification to the subscribed UIEventListener objects.
void	dispatchKeyReleaseEvent (unsigned short unicode_ch, EKey key)
	Dispatches the UIEventListener::keyReleaseEvent() notification to the subscribed UIEventListener objects.
void	dispatchDestroyEvent ()
	Dispatches the UIEventListener::destroyEvent() notification to the subscribed UIEventListener objects.
void	dispatchRunEvent ()
	Dispatches the UIEventListener::runEvent() notification to the subscribed UIEventListener objects.
void	dispatchVisibilityEvent (bool visible)
	Dispatches the UIEventListener::visibilityEvent() notification to the subscribed UIEventListener objects.
void	dispatchInitEvent ()
	Dispatches the UIEventListener::initEvent() notification to the subscribed UIEventListener objects.
void	dispatchFileDroppedEvent (const std::vector< String > &files)
	Dispatches the UIEventListener::fileDroppedEvent() notification to the subscribed UIEventListener objects.
const std::set< EKey > &	keyboard () const
	Returns the std::set containing the currently pressed keys.
bool	isKeyPressed (EKey key) const
	Returns true if the given key is pressed.
void	keyPress (EKey key)
	Inserts the specified key in the set of currently active keys - For internal use only.
void	keyRelease (EKey key)
	Removes the specified key from the set of currently active keys - For internal use only.
bool	isInitialized () const
	Returns true if the OpenGLContext is in an initialized state.
int	textureUnitCount () const
	The number (clamped to VL_MAX_TEXTURE_UNITS) of texture units supported by the current hardware.
bool	hasDoubleBuffer () const
	Returns `true` if an OpenGLContext supports double buffering.
bool	isCompatible () const
	Returns `true` if an OpenGLContext provides backwards compatibility to previous OpenGL API versions.
int	openglVersionMajorNumber () const
	Returns the OpenGL's driver version's major number.
int	openglVersionMinorNumber () const
	Returns the OpenGL's driver version's minor number.
void	bindVAS (const IVertexAttribSet *vas, bool use_vbo, bool force)
	Activates the specified vertex attribute set - For internal use only.
void	applyEnables (const EnableSet prev, const EnableSet cur)
	Applies an EnableSet to an OpenGLContext - For internal use only.
void	applyRenderStates (const RenderStateSet prev, const RenderStateSet cur, const Camera *camera)
	Applies a RenderStateSet to an OpenGLContext - For internal use only.
void	resetEnables ()
	Resets all the interanal enable-tables - For internal use only.
void	resetRenderStates ()
	Resets all the interanal render-states-tables - For internal use only.
void	resetContextStates ()
	Resets the OpenGL states necessary to begin and finish a rendering. - For internal use only.
void	setTexUnitBinding (int unit_i, ETextureDimension target)
	Declares that texture unit `unit_i` is currently bound to the specified texture target. - For internal use only.
ETextureDimension	texUnitBinding (int unit_i) const
	Returnes the texture target currently active for the specified texture unit. - For internal use only.
Static Public Member Functions
static bool	areUniformsColliding (const UniformSet u1, const UniformSet u2)
	Returns `true` if the two UniformSet contain at least one Uniform variable with the same name.
static bool	isCleanState (bool verbose)
	Checks whether the OpenGL state is clean or not.
Protected Attributes
ref< RenderTarget >	mRenderTarget
std::vector< ref < FBORenderTarget > >	mFBORenderTarget
std::vector< ref < UIEventListener > >	mEventListeners
std::set< EKey >	mKeyboard
OpenGLContextFormat	mGLContextInfo
int	mMaxVertexAttrib
int	mTextureUnitCount
int	mMajorVersion
int	mMinorVersion
bool	mMouseVisible
bool	mContinuousUpdate
bool	mIgnoreNextMouseMoveEvent
bool	mFullscreen
bool	mHasDoubleBuffer
bool	mIsInitialized
bool	mIsCompatible
int	mEnableTable [EN_EnableCount]
int	mRenderStateTable [RS_COUNT]
bool	mCurrentEnable [EN_EnableCount]
const RenderState *	mCurrentRenderState [RS_COUNT]
ref< RenderState >	mDefaultRenderStates [RS_COUNT]
ETextureDimension	mTexUnitBinding [VL_MAX_TEXTURE_UNITS]
const IVertexAttribSet *	mCurVAS
VertexArrayInfo	mVertexArray
VertexArrayInfo	mNormalArray
VertexArrayInfo	mColorArray
VertexArrayInfo	mSecondaryColorArray
VertexArrayInfo	mFogArray
VertexArrayInfo	mTexCoordArray [VL_MAX_TEXTURE_UNITS]
VertexArrayInfo	mVertexAttrib [VL_MAX_GENERIC_VERTEX_ATTRIB]

Detailed Description

Represents an OpenGL context, possibly a widget or a pbuffer, which can also respond to keyboard, mouse or system events.

OpenGLContext is an abstract class that wraps a minimal common subset of GUI APIs like Win32, Qt, wxWidgets, SDL, GLUT, etc.
In order to respond to the events generated by the OpenGLContext you must subclass an UIEventListener and bind it to the OpenGLContext using the functions addEventListener(ref<UIEventListener>) and removeEventListener(ref<UIEventListener>).

OpenGLContext Custom Implementation

Key_Alt/Ctrl/Shift events must always be notified before Key_Left/Right-Alt/Ctrl/Shift events.
Always update the mKeyboard structure appropriately especially with respect to Key_[Left/Right]-Alt/Ctrl/Shift events.
When cycling through EventListeners to dispatch the events you must do it on a temporary copy of mEventListeners so that the EventListeners can safely add/remove themselves or other EventListeners to the OpenGLContext itself.

Constructor & Destructor Documentation

OpenGLContext::OpenGLContext	(	int	w = `0`,
		int	h = `0`
	)

Constructor.

vl::OpenGLContext::~OpenGLContext ( ) [inline]

Destructor.

Dispatches also destroyEvent() to its event listeners.

Member Function Documentation

virtual const char* vl::OpenGLContext::className ( ) [inline, virtual]

Returns the name of the class.

Reimplemented from vl::Object.

virtual void vl::OpenGLContext::swapBuffers ( ) [pure virtual]

Swaps the back and front buffers to present the last rendering.

Implemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual void vl::OpenGLContext::makeCurrent ( ) [pure virtual]

Sets the OpenGL context as current for the calling thread.

Implemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

void OpenGLContext::initGLContext ( bool log = true )

Initializes the supported OpenGL extensions.

void OpenGLContext::logOpenGLInfo ( )

Logs some information about the OpenGL context.

bool OpenGLContext::isExtensionSupported ( const char * ext_name )

Returns true if the given extension is supported.

Note:: This is a relatively slow function, don't use it inside loops and similar.

void * OpenGLContext::getProcAddress ( const char * function_name )

Returns the address of an OpenGL extension function.

RenderTarget* vl::OpenGLContext::renderTarget ( ) [inline]

The render target representing this OpenGL context.

The returned RenderTarget's dimensions will be automatically updated to the OpenGLContext's dimensions.

const RenderTarget* vl::OpenGLContext::renderTarget ( ) const [inline]

The render target representing this OpenGL context.

The returned RenderTarget's dimensions will be automatically updated to the OpenGLContext's dimensions.

ref<FBORenderTarget> vl::OpenGLContext::createFBORenderTarget	(	int	width,
		int	height
	)		`[inline]`

Creates a new FBORenderTarget (framebuffer object RenderTarget).

Note:: A framebuffer object always belongs to an OpenGL context and in order to render on it the appropriate OpenGL context must be active.

ref<FBORenderTarget> vl::OpenGLContext::createFBORenderTarget ( ) [inline]

Equivalent to "createFBORenderTarget(0,0);".

void vl::OpenGLContext::destroyFBORenderTarget ( FBORenderTarget * fbort ) [inline]

Destroyes the specified FBORenderTarget.

void vl::OpenGLContext::destroyAllFBORenderTargets ( ) [inline]

Removes all FBORenderTargets belonging to an OpenGLContext.

virtual void vl::OpenGLContext::quitApplication ( ) [inline, virtual]

Asks to the windowing system that is managing the OpenGLContext to quit the application.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual void vl::OpenGLContext::destroy ( ) [inline, virtual]

This function should be appropriately reimplemented in all the subclasses of OpenGLContext.

Reimplemented in vlQt4::Qt4Widget, vlWin32::Win32Window, vlMFC::MFCWindow, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual void vl::OpenGLContext::update ( ) [inline, virtual]

If the OpenGLContext is a widget this function requests a redraw.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual void vl::OpenGLContext::setWindowTitle ( const String & ) [inline, virtual]

If the OpenGL context is a top window this function sets its title.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual bool vl::OpenGLContext::setFullscreen ( bool ) [inline, virtual]

If the OpenGL context is a widget this function requests a maximization to fullscreen.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, and vlGLUT::GLUTWindow.

virtual bool vl::OpenGLContext::fullscreen ( ) const [inline, virtual]

If the OpenGL context is a widget this function returns whether it has been maximized to fullscreen.

virtual void vl::OpenGLContext::show ( ) [inline, virtual]

If the OpenGL context is a widget this function makes it visible to the user.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, and vlGLUT::GLUTWindow.

virtual void vl::OpenGLContext::hide ( ) [inline, virtual]

If the OpenGL context is a widget this function makes it invisible to the user.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, and vlGLUT::GLUTWindow.

virtual void vl::OpenGLContext::setPosition	(	int	,
		int
	)		`[inline, virtual]`

If the OpenGL context is a widget this function sets its position.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual ivec2 vl::OpenGLContext::position ( ) const [inline, virtual]

If the OpenGL context is a widget this function returns its position.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, and vlGLUT::GLUTWindow.

virtual void vl::OpenGLContext::setSize	(	int	,
		int
	)		`[inline, virtual]`

If the OpenGL context is a widget this function sets its size.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, and vlGLUT::GLUTWindow.

int vl::OpenGLContext::width ( ) const [inline]

Returns the width in pixels of an OpenGLContext.

int vl::OpenGLContext::height ( ) const [inline]

Returns the height in pixels of an OpenGLContext.

virtual void vl::OpenGLContext::setMouseVisible ( bool ) [inline, virtual]

If the OpenGL context is a widget this function sets whether the mouse is visible over it or not.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual bool vl::OpenGLContext::mouseVisible ( ) const [inline, virtual]

If the OpenGL context is a widget this function returns whether the mouse is visible over it or not.

virtual void vl::OpenGLContext::setMousePosition	(	int	,
		int
	)		`[inline, virtual]`

If the OpenGL context is a widget this function sets the mouse position.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, vlGLUT::GLUTWindow, and vlSDL::SDLWindow.

virtual void vl::OpenGLContext::getFocus ( ) [inline, virtual]

If the OpenGL context is a widget this function requests the mouse focus on it.

Reimplemented in vlQt4::Qt4Widget, vlWX::vlWXGLCanvas, vlWin32::Win32Context, and vlGLUT::GLUTWindow.

void OpenGLContext::setVSyncEnabled ( bool enable )

If the OpenGL context is a widget this function enabled/disables double buffer swapping to the monitor's vertical synch.

bool OpenGLContext::vsyncEnabled ( ) const

If the OpenGL context is a widget this function returns whether vsync is enabled or not.

virtual void vl::OpenGLContext::setContinuousUpdate ( bool continuous ) [inline, virtual]

If the OpenGL context is a widget this function sets whether its area is continuously updated at each frame.

Reimplemented in vlQt4::Qt4Widget.

bool vl::OpenGLContext::continuousUpdate ( ) const [inline]

If the OpenGL context is a widget this function returns whether its area is continuously updated at each frame.

void OpenGLContext::addEventListener ( UIEventListener * el )

Adds an UIEventListener to be notified of OpenGLContext related events.

Note:: An UIEventListener can be associated only to one OpenGLContext at a time.

void OpenGLContext::removeEventListener ( UIEventListener * el )

Removes an UIEventListener.

void OpenGLContext::eraseAllEventListeners ( )

Removes all UIEventListener previously registered.

const std::vector< ref<UIEventListener> >& vl::OpenGLContext::eventListeners ( ) const [inline]

The currently UIEventListener registered to be notified of OpenGLContext related events.

UIEventListener* vl::OpenGLContext::eventListener ( int i ) const [inline]

Returns the i-th UIEventListener registered to an OpenGLContext.

int vl::OpenGLContext::eventListenerCount ( ) const [inline]

Returns the number of UIEventListener registered to an OpenGLContext.

const OpenGLContextFormat& vl::OpenGLContext::openglContextInfo ( ) const [inline]

Returns an OpenGLContextFormat structure describing an OpenGLContext.

void vl::OpenGLContext::setOpenGLContextInfo ( const OpenGLContextFormat & info ) [inline]

Sets the OpenGLContextFormat associated to an OpenGLContext.

void vl::OpenGLContext::ignoreNextMouseMoveEvent ( ) [inline]

Requests not to dispatch the next mouse move event.

void vl::OpenGLContext::dispatchResizeEvent	(	int	w,
		int	h
	)		`[inline]`

Dispatches the UIEventListener::resizeEvent() notification to the subscribed UIEventListener objects.

Call this function at the beginning if you reimplement it

void vl::OpenGLContext::dispatchMouseMoveEvent	(	int	x,
		int	y
	)		`[inline]`

Dispatches the UIEventListener::mouseMoveEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchMouseUpEvent	(	EMouseButton	button,
		int	x,
		int	y
	)		`[inline]`

Dispatches the UIEventListener::mouseUpEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchMouseDownEvent	(	EMouseButton	button,
		int	x,
		int	y
	)		`[inline]`

Dispatches the UIEventListener::mouseDownEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchMouseWheelEvent ( int n ) [inline]

Dispatches the UIEventListener::mouseWheelEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchKeyPressEvent	(	unsigned short	unicode_ch,
		EKey	key
	)		`[inline]`

Dispatches the UIEventListener::keyPressEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchKeyReleaseEvent	(	unsigned short	unicode_ch,
		EKey	key
	)		`[inline]`

Dispatches the UIEventListener::keyReleaseEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchDestroyEvent ( ) [inline]

Dispatches the UIEventListener::destroyEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchRunEvent ( ) [inline]

Dispatches the UIEventListener::runEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchVisibilityEvent ( bool visible ) [inline]

Dispatches the UIEventListener::visibilityEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchInitEvent ( ) [inline]

Dispatches the UIEventListener::initEvent() notification to the subscribed UIEventListener objects.

void vl::OpenGLContext::dispatchFileDroppedEvent ( const std::vector< String > & files ) [inline]

Dispatches the UIEventListener::fileDroppedEvent() notification to the subscribed UIEventListener objects.

const std::set<EKey>& vl::OpenGLContext::keyboard ( ) const [inline]

Returns the std::set containing the currently pressed keys.

bool vl::OpenGLContext::isKeyPressed ( EKey key ) const [inline]

Returns true if the given key is pressed.

void vl::OpenGLContext::keyPress ( EKey key ) [inline]

Inserts the specified key in the set of currently active keys - For internal use only.

void vl::OpenGLContext::keyRelease ( EKey key ) [inline]

Removes the specified key from the set of currently active keys - For internal use only.

bool vl::OpenGLContext::isInitialized ( ) const [inline]

Returns true if the OpenGLContext is in an initialized state.

int vl::OpenGLContext::textureUnitCount ( ) const [inline]

The number (clamped to VL_MAX_TEXTURE_UNITS) of texture units supported by the current hardware.

bool vl::OpenGLContext::hasDoubleBuffer ( ) const [inline]

Returns true if an OpenGLContext supports double buffering.

bool vl::OpenGLContext::isCompatible ( ) const [inline]

Returns true if an OpenGLContext provides backwards compatibility to previous OpenGL API versions.

int vl::OpenGLContext::openglVersionMajorNumber ( ) const [inline]

Returns the OpenGL's driver version's major number.

int vl::OpenGLContext::openglVersionMinorNumber ( ) const [inline]

Returns the OpenGL's driver version's minor number.

void OpenGLContext::bindVAS	(	const IVertexAttribSet *	vas,
		bool	use_vbo,
		bool	force
	)

Activates the specified vertex attribute set - For internal use only.

Parameters:

vas	The IVertexAttribSet to be activated. It can be NULL, in which case all vertex attributes are disabled. If `vas` is the same as the last activated IVertexAttribSet then no operation is done.
use_vbo	Whether vertex-buffer-objects should be used when activating the vertex attributes.
force	Binds `vas` even if it was the last to be activated (this is also valid for NULL).

void OpenGLContext::applyEnables	(	const EnableSet *	prev,
		const EnableSet *	cur
	)

Applies an EnableSet to an OpenGLContext - For internal use only.

void OpenGLContext::applyRenderStates	(	const RenderStateSet *	prev,
		const RenderStateSet *	cur,
		const Camera *	camera
	)

Applies a RenderStateSet to an OpenGLContext - For internal use only.

void OpenGLContext::resetEnables ( )

Resets all the interanal enable-tables - For internal use only.

void OpenGLContext::resetRenderStates ( )

Resets all the interanal render-states-tables - For internal use only.

void OpenGLContext::resetContextStates ( )

Resets the OpenGL states necessary to begin and finish a rendering. - For internal use only.

void vl::OpenGLContext::setTexUnitBinding	(	int	unit_i,
		ETextureDimension	target
	)		`[inline]`

Declares that texture unit unit_i is currently bound to the specified texture target. - For internal use only.

ETextureDimension vl::OpenGLContext::texUnitBinding ( int unit_i ) const [inline]

Returnes the texture target currently active for the specified texture unit. - For internal use only.

bool OpenGLContext::areUniformsColliding	(	const UniformSet *	u1,
		const UniformSet *	u2
	)		`[static]`

Returns true if the two UniformSet contain at least one Uniform variable with the same name.

bool OpenGLContext::isCleanState ( bool verbose ) [static]

Checks whether the OpenGL state is clean or not.

Clean state conditions:

All functionalities must be disabled, no GL_LIGHTING, GL_DEPTH_TEST, GL_LIGHTn, GL_CLIP_PLANEn etc. enabled, with the sole exception of GL_MULTISAMPLE.
All buffer objects targets such as GL_ARRAY_BUFFER, GL_ELEMENT_ARRAY_BUFFER etc. must be bound to buffer object #0.
Current texture unit and client texture unit must be #0.
All texture matrices must be set to identity.
All texture targets must be bound to texture #0.
All GL_TEXTURE_COORD_ARRAYs must be disabled.
All texture targets such as GL_TEXTURE_1D, GL_TEXTURE_2D etc. must be disabled.
All texture targets should be bound to texture #0.
All texture coordinate generation modes such as GL_TEXTURE_GEN_S/T/R/Q must be disable for all texture units.
All vertex arrays such as GL_COLOR_ARRAY, GL_NORMAL_ARRAY etc. must be disabled, including the ones enabled with glEnableVertexAttribArray()
NOTE: blending function must be set to glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA).
Color write-mask should be glColorMask(GL_TRUE ,GL_TRUE, GL_TRUE, GL_TRUE).
Depth write-mask should be glDepthMask(GL_TRUE).
Polygon mode should be glPolygonMode(GL_FRONT_AND_BACK, GL_FILL).
In general all OpenGL render states should be set to their default values.