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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...
 
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 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...
 
void PrintRevisions (ostream &)
 Legacy. 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 *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 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)
 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 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 ()
 These methods allow a command to exclusively grab all events. More...
 
- 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

Definition at line 42 of file vtkOpenGLRenderUtilities.h.

Constructor & Destructor Documentation

vtkOpenGLRenderUtilities::vtkOpenGLRenderUtilities ( )
protected
vtkOpenGLRenderUtilities::~vtkOpenGLRenderUtilities ( )
overrideprotected

Member Function Documentation

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

static vtkOpenGLRenderUtilities* vtkOpenGLRenderUtilities::SafeDownCast ( vtkObjectBase o)
static
virtual vtkObjectBase* vtkOpenGLRenderUtilities::NewInstanceInternal ( ) const
protectedvirtual
vtkOpenGLRenderUtilities* vtkOpenGLRenderUtilities::NewInstance ( ) const
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.

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.

static void vtkOpenGLRenderUtilities::RenderTriangles ( float verts,
unsigned int  numVerts,
GLuint *  indices,
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.

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