VTK  9.1.0
Public Types | Public Member Functions | Static Public Member Functions | Protected Member Functions | List of all members
vtkOpenGLRenderUtilities Class Reference

OpenGL rendering utility functions. More...

#include <vtkOpenGLRenderUtilities.h>

Inheritance diagram for vtkOpenGLRenderUtilities:
[legend]
Collaboration diagram for vtkOpenGLRenderUtilities:
[legend]

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...
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses. More...
 
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)
 
int InvokeEvent (unsigned long event)
 
int InvokeEvent (const char *event)
 
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)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
vtkCommandGetCommand (unsigned long tag)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
void RemoveObserver (vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
void RemoveObservers (unsigned long event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
void RemoveObservers (const char *event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
vtkTypeBool HasObserver (unsigned long event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
vtkTypeBool HasObserver (const char *event, vtkCommand *)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
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)
 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, 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)
 This method invokes an event and return whether the event was aborted or not. More...
 
- Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
 Return the class name as a string. More...
 
virtual vtkTypeBool IsA (const char *name)
 Return 1 if this class is the same type of (or a subclass of) the named class. More...
 
virtual vtkIdType GetNumberOfGenerationsFromBase (const char *name)
 Given the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class). 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 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...
 
bool GetIsInMemkind () const
 A local state flag that remembers whether this object lives in the normal or extended memory space. More...
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 Methods invoked by print to print information about the object including superclasses. More...
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 Methods invoked by print to print information about the object including superclasses. More...
 

Static Public Member Functions

static vtkTypeBool IsTypeOf (const char *type)
 
static vtkOpenGLRenderUtilitiesSafeDownCast (vtkObjectBase *o)
 
static bool PrepFullScreenVAO (vtkOpenGLBufferObject *vertBuf, 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 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 *iboData, unsigned int numIndices, 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 std::string GetFullScreenQuadVertexShader ()
 Draw a full-screen quad: More...
 
static std::string GetFullScreenQuadFragmentShaderTemplate ()
 Draw a full-screen quad: More...
 
static std::string GetFullScreenQuadGeometryShader ()
 Draw a full-screen quad: More...
 
static bool PrepFullScreenVAO (vtkOpenGLRenderWindow *renWin, vtkOpenGLVertexArrayObject *vao, vtkShaderProgram *prog)
 Draw a full-screen quad: More...
 
static void DrawFullScreenQuad ()
 Draw a full-screen quad: 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 ()
 This is a global flag that controls whether any debug, warning or error messages are displayed. More...
 
static void GlobalWarningDisplayOff ()
 This is a global flag that controls whether any debug, warning or error messages are displayed. More...
 
static int GetGlobalWarningDisplay ()
 This is a global flag that controls whether any debug, warning or error messages are displayed. More...
 
- 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 vtkIdType GetNumberOfGenerationsFromBaseType (const char *name)
 Given a the name of a base class of this class type, return the distance of inheritance between this class type and the named class (how many generations of inheritance are there between this class and the named class). More...
 
static vtkObjectBaseNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 
static void SetMemkindDirectory (const char *directoryname)
 The name of a directory, ideally mounted -o dax, to memory map an extended memory space within. More...
 
static bool GetUsingMemkind ()
 A global state flag that controls whether vtkObjects are constructed in the usual way (the default) or within the extended memory space. 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 ()
 These methods allow a command to exclusively grab all events. More...
 
- Protected Member Functions inherited from vtkObjectBase
 vtkObjectBase ()
 
virtual ~vtkObjectBase ()
 
virtual void RegisterInternal (vtkObjectBase *, vtkTypeBool check)
 
virtual void UnRegisterInternal (vtkObjectBase *, vtkTypeBool check)
 
virtual void ReportReferences (vtkGarbageCollector *)
 
 vtkObjectBase (const vtkObjectBase &)
 
void operator= (const vtkObjectBase &)
 

Additional Inherited Members

- Static Protected Member Functions inherited from vtkObjectBase
static vtkMallocingFunction GetCurrentMallocFunction ()
 
static vtkReallocingFunction GetCurrentReallocFunction ()
 
static vtkFreeingFunction GetCurrentFreeFunction ()
 
static vtkFreeingFunction GetAlternateFreeFunction ()
 
- Protected Attributes inherited from vtkObject
bool Debug
 
vtkTimeStamp MTime
 
vtkSubjectHelper * SubjectHelper
 
- Protected Attributes inherited from vtkObjectBase
std::atomic< int32_t > 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 *  iboData,
unsigned int  numIndices,
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.

◆ 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();
Allocate and hold a VTK object.
Definition: vtkNew.h:165
T * Get() const noexcept
Get a raw pointer to the contained object.
Definition: vtkNew.h:255
OpenGL rendering utility functions.
The ShaderProgram uses one or more Shader objects.
bool SetUniformi(const char *name, int v)
Set the name uniform value to int v.
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...
@ string
Definition: vtkX3D.h:496

◆ GetFullScreenQuadFragmentShaderTemplate()

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

◆ GetFullScreenQuadGeometryShader()

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

◆ PrepFullScreenVAO() [1/2]

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

◆ DrawFullScreenQuad()

static void vtkOpenGLRenderUtilities::DrawFullScreenQuad ( )
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();

◆ PrepFullScreenVAO() [2/2]

static bool vtkOpenGLRenderUtilities::PrepFullScreenVAO ( vtkOpenGLBufferObject vertBuf,
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: