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vtkOpenGLRenderUtilities Class Reference

OpenGL rendering utility functions. More...

#include <vtkOpenGLRenderUtilities.h>

Inheritance diagram for vtkOpenGLRenderUtilities:
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Collaboration diagram for vtkOpenGLRenderUtilities:
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Public Types

typedef vtkObject Superclass
 

Public Member Functions

virtual vtkTypeBool IsA (const char *type)
 Return 1 if this class is the same type of (or a subclass of) the named class. More...
 
vtkOpenGLRenderUtilitiesNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses. More...
 
- Public Member Functions inherited from vtkObject
 vtkBaseTypeMacro (vtkObject, vtkObjectBase)
 
virtual void DebugOn ()
 Turn debugging output on. More...
 
virtual void DebugOff ()
 Turn debugging output off. More...
 
bool GetDebug ()
 Get the value of the debug flag. More...
 
void SetDebug (bool debugFlag)
 Set the value of the debug flag. More...
 
virtual void Modified ()
 Update the modification time for this object. More...
 
virtual vtkMTimeType GetMTime ()
 Return this object's modified time. More...
 
unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
 
vtkCommandGetCommand (unsigned long tag)
 
void RemoveObserver (vtkCommand *)
 
void RemoveObservers (unsigned long event, vtkCommand *)
 
void RemoveObservers (const char *event, vtkCommand *)
 
vtkTypeBool HasObserver (unsigned long event, vtkCommand *)
 
vtkTypeBool HasObserver (const char *event, vtkCommand *)
 
void RemoveObserver (unsigned long tag)
 
void RemoveObservers (unsigned long event)
 
void RemoveObservers (const char *event)
 
void RemoveAllObservers ()
 
vtkTypeBool HasObserver (unsigned long event)
 
vtkTypeBool HasObserver (const char *event)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
 Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 Allow user to set the AbortFlagOn() with the return value of the callback method. More...
 
int InvokeEvent (unsigned long event, void *callData)
 This method invokes an event and return whether the event was aborted or not. More...
 
int InvokeEvent (const char *event, void *callData)
 
int InvokeEvent (unsigned long event)
 
int InvokeEvent (const char *event)
 
- Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
 Return the class name as a string. More...
 
virtual void Delete ()
 Delete a VTK object. More...
 
virtual void FastDelete ()
 Delete a reference to this object. More...
 
void InitializeObjectBase ()
 
void Print (ostream &os)
 Print an object to an ostream. More...
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 
virtual void Register (vtkObjectBase *o)
 Increase the reference count (mark as used by another object). More...
 
virtual void UnRegister (vtkObjectBase *o)
 Decrease the reference count (release by another object). More...
 
int GetReferenceCount ()
 Return the current reference count of this object. More...
 
void SetReferenceCount (int)
 Sets the reference count. More...
 
void PrintRevisions (ostream &)
 Legacy. More...
 

Static Public Member Functions

static vtkTypeBool IsTypeOf (const char *type)
 
static vtkOpenGLRenderUtilitiesSafeDownCast (vtkObjectBase *o)
 
static void RenderQuad (float *verts, float *tcoords, vtkShaderProgram *program, vtkOpenGLVertexArrayObject *vao)
 Helper function that draws a quad on the screen at the specified vertex coordinates and if tcoords are not NULL with the specified texture coordinates. More...
 
static void RenderTriangles (float *verts, unsigned int numVerts, GLuint *indices, unsigned int numIndices, float *tcoords, vtkShaderProgram *program, vtkOpenGLVertexArrayObject *vao)
 
static std::string GetFullScreenQuadVertexShader ()
 Draw a full-screen quad: More...
 
static std::string GetFullScreenQuadFragmentShaderTemplate ()
 
static std::string GetFullScreenQuadGeometryShader ()
 
static bool PrepFullScreenVAO (vtkOpenGLRenderWindow *renWin, vtkOpenGLVertexArrayObject *vao, vtkShaderProgram *prog)
 
static void DrawFullScreenQuad ()
 
static bool PrepFullScreenVAO (vtkOpenGLBufferObject *verts, vtkOpenGLVertexArrayObject *vao, vtkShaderProgram *prog)
 
static void MarkDebugEvent (const std::string &event)
 Pass a debugging mark to the render engine to assist development via tools like apitrace. More...
 
- Static Public Member Functions inherited from vtkObject
static vtkObjectNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 
static void BreakOnError ()
 This method is called when vtkErrorMacro executes. More...
 
static void SetGlobalWarningDisplay (int val)
 This is a global flag that controls whether any debug, warning or error messages are displayed. More...
 
static void GlobalWarningDisplayOn ()
 
static void GlobalWarningDisplayOff ()
 
static int GetGlobalWarningDisplay ()
 
- Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool IsTypeOf (const char *name)
 Return 1 if this class type is the same type of (or a subclass of) the named class. More...
 
static vtkObjectBaseNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 

Protected Member Functions

virtual vtkObjectBaseNewInstanceInternal () const
 
 vtkOpenGLRenderUtilities ()
 
 ~vtkOpenGLRenderUtilities () override
 
- Protected Member Functions inherited from vtkObject
 vtkObject ()
 
 ~vtkObject () override
 
void RegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr)
 These methods allow a command to exclusively grab all events. More...
 
void InternalReleaseFocus ()
 
- Protected Member Functions inherited from vtkObjectBase
 vtkObjectBase ()
 
virtual ~vtkObjectBase ()
 
virtual void CollectRevisions (ostream &)
 
virtual void ReportReferences (vtkGarbageCollector *)
 
 vtkObjectBase (const vtkObjectBase &)
 
void operator= (const vtkObjectBase &)
 

Additional Inherited Members

- Protected Attributes inherited from vtkObject
bool Debug
 
vtkTimeStamp MTime
 
vtkSubjectHelper * SubjectHelper
 
- Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32 ReferenceCount
 
vtkWeakPointerBase ** WeakPointers
 

Detailed Description

OpenGL rendering utility functions.

vtkOpenGLRenderUtilities provides functions to help render primitives.

See also the vtkOpenGLQuadHelper class which may be easier to use.

Definition at line 39 of file vtkOpenGLRenderUtilities.h.

Member Typedef Documentation

◆ Superclass

Definition at line 42 of file vtkOpenGLRenderUtilities.h.

Constructor & Destructor Documentation

◆ vtkOpenGLRenderUtilities()

vtkOpenGLRenderUtilities::vtkOpenGLRenderUtilities ( )
protected

◆ ~vtkOpenGLRenderUtilities()

vtkOpenGLRenderUtilities::~vtkOpenGLRenderUtilities ( )
overrideprotected

Member Function Documentation

◆ IsTypeOf()

static vtkTypeBool vtkOpenGLRenderUtilities::IsTypeOf ( const char *  type)
static

◆ IsA()

virtual vtkTypeBool vtkOpenGLRenderUtilities::IsA ( const char *  name)
virtual

Return 1 if this class is the same type of (or a subclass of) the named class.

Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkObjectBase.

◆ SafeDownCast()

static vtkOpenGLRenderUtilities* vtkOpenGLRenderUtilities::SafeDownCast ( vtkObjectBase o)
static

◆ NewInstanceInternal()

virtual vtkObjectBase* vtkOpenGLRenderUtilities::NewInstanceInternal ( ) const
protectedvirtual

◆ NewInstance()

vtkOpenGLRenderUtilities* vtkOpenGLRenderUtilities::NewInstance ( ) const

◆ PrintSelf()

void vtkOpenGLRenderUtilities::PrintSelf ( ostream &  os,
vtkIndent  indent 
)
overridevirtual

Methods invoked by print to print information about the object including superclasses.

Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkObject.

◆ RenderQuad()

static void vtkOpenGLRenderUtilities::RenderQuad ( float verts,
float tcoords,
vtkShaderProgram program,
vtkOpenGLVertexArrayObject vao 
)
static

Helper function that draws a quad on the screen at the specified vertex coordinates and if tcoords are not NULL with the specified texture coordinates.

◆ RenderTriangles()

static void vtkOpenGLRenderUtilities::RenderTriangles ( float verts,
unsigned int  numVerts,
GLuint *  indices,
unsigned int  numIndices,
float tcoords,
vtkShaderProgram program,
vtkOpenGLVertexArrayObject vao 
)
static

◆ GetFullScreenQuadVertexShader()

static std::string vtkOpenGLRenderUtilities::GetFullScreenQuadVertexShader ( )
static

Draw a full-screen quad:

  • VertexShader and GeometryShader should be used as-is when building the ShaderProgram.
  • FragmentShaderTemplate supports the replacements //VTK::FSQ::Decl and //VTK::FSQ::Impl for declaring variables and the shader body, respectively.
  • The varying texCoord is available to the fragment shader for texture lookups into full-screen textures, ie. texture2D(textureName, texCoord).
  • PrepFullScreenVAO initializes a new VAO for drawing a quad.
  • DrawFullScreenQuad actually draws the quad.

Example usage:

typedef vtkOpenGLRenderUtilities GLUtil;
// Prep fragment shader source:
std::string fragShader = GLUtil::GetFullScreenQuadFragmentShaderTemplate();
vtkShaderProgram::Substitute(fragShader, "//VTK::FSQ::Decl",
"uniform sampler2D aTexture;");
vtkShaderProgram::Substitute(fragShader, "//VTK::FSQ::Impl",
"gl_FragData[0] = texture2D(aTexture, texCoord);");
// Create shader program:
vtkShaderProgram *prog = shaderCache->ReadyShaderProgram(
GLUtil::GetFullScreenQuadVertexShader().c_str(),
fragShader.c_str(),
GLUtil::GetFullScreenQuadGeometryShader().c_str());
// Initialize new VAO/vertex buffer. This is only done once:
GLUtil::PrepFullScreenVAO(renWin, vao.Get(), prog);
// Setup shader program to sample vtkTextureObject aTexture:
aTexture->Activate();
prog->SetUniformi("aTexture", aTexture->GetTextureUnit());
// Render the full-screen quad:
vao->Bind();
GLUtil::DrawFullScreenQuad();
vao->Release();
aTexture->Deactivate();

◆ GetFullScreenQuadFragmentShaderTemplate()

static std::string vtkOpenGLRenderUtilities::GetFullScreenQuadFragmentShaderTemplate ( )
static

◆ GetFullScreenQuadGeometryShader()

static std::string vtkOpenGLRenderUtilities::GetFullScreenQuadGeometryShader ( )
static

◆ PrepFullScreenVAO() [1/2]

static bool vtkOpenGLRenderUtilities::PrepFullScreenVAO ( vtkOpenGLRenderWindow renWin,
vtkOpenGLVertexArrayObject vao,
vtkShaderProgram prog 
)
static

◆ DrawFullScreenQuad()

static void vtkOpenGLRenderUtilities::DrawFullScreenQuad ( )
static

◆ PrepFullScreenVAO() [2/2]

static bool vtkOpenGLRenderUtilities::PrepFullScreenVAO ( vtkOpenGLBufferObject verts,
vtkOpenGLVertexArrayObject vao,
vtkShaderProgram prog 
)
static

◆ MarkDebugEvent()

static void vtkOpenGLRenderUtilities::MarkDebugEvent ( const std::string &  event)
static

Pass a debugging mark to the render engine to assist development via tools like apitrace.

This calls glDebugMessageInsert to insert the event string into the OpenGL command stream.

Note that this method only works when glDebugMessageInsert is bound, which it may not be on certain platforms.


The documentation for this class was generated from the following file:
vtkOpenGLRenderUtilities
OpenGL rendering utility functions.
Definition: vtkOpenGLRenderUtilities.h:39
vtkShaderProgram
The ShaderProgram uses one or more Shader objects.
Definition: vtkShaderProgram.h:47
vtkOpenGLVertexArrayObject::Release
void Release()
vtkShaderProgram::SetUniformi
bool SetUniformi(const char *name, int v)
Set the name uniform value to int v.
vtkNew
Allocate and hold a VTK object.
Definition: vtkNew.h:58
vtkShaderProgram::Substitute
static bool Substitute(std::string &source, const std::string &search, const std::string &replace, bool all=true)
perform in place string substitutions, indicate if a substitution was done this is useful for buildin...
vtkX3D::string
Definition: vtkX3D.h:490
vtkOpenGLVertexArrayObject::Bind
void Bind()
vtkNew::Get
T * Get() const
Definition: vtkNew.h:108