Section: Visualization Toolkit Rendering Classes
To create an instance of class vtkPixelBufferObject, simply invoke its constructor as follows
obj = vtkPixelBufferObject
obj
is an instance of the vtkPixelBufferObject class.
string = obj.GetClassName ()
int = obj.IsA (string name)
vtkPixelBufferObject = obj.NewInstance ()
vtkPixelBufferObject = obj.SafeDownCast (vtkObject o)
obj.SetContext (vtkRenderWindow context)
- Get/Set the context. Context must be a vtkOpenGLRenderWindow.
This does not increase the reference count of the
context to avoid reference loops.
SetContext() may raise an error is the OpenGL context does not support the
required OpenGL extensions.
vtkRenderWindow = obj.GetContext ()
- Get/Set the context. Context must be a vtkOpenGLRenderWindow.
This does not increase the reference count of the
context to avoid reference loops.
SetContext() may raise an error is the OpenGL context does not support the
required OpenGL extensions.
int = obj.GetUsage ()
- Usage is a performance hint.
Valid values are:
- StreamDraw specified once by A, used few times S
- StreamRead specified once by R, queried a few times by A
- StreamCopy specified once by R, used a few times S
- StaticDraw specified once by A, used many times S
- StaticRead specificed once by R, queried many times by A
- StaticCopy specified once by R, used many times S
- DynamicDraw respecified repeatedly by A, used many times S
- DynamicRead respecified repeatedly by R, queried many times by A
- DynamicCopy respecified repeatedly by R, used many times S
A: the application
S: as the source for GL drawing and image specification commands.
R: reading data from the GL
Initial value is StaticDraw, as in OpenGL spec.
obj.SetUsage (int )
- Usage is a performance hint.
Valid values are:
- StreamDraw specified once by A, used few times S
- StreamRead specified once by R, queried a few times by A
- StreamCopy specified once by R, used a few times S
- StaticDraw specified once by A, used many times S
- StaticRead specificed once by R, queried many times by A
- StaticCopy specified once by R, used many times S
- DynamicDraw respecified repeatedly by A, used many times S
- DynamicRead respecified repeatedly by R, queried many times by A
- DynamicCopy respecified repeatedly by R, used many times S
A: the application
S: as the source for GL drawing and image specification commands.
R: reading data from the GL
Initial value is StaticDraw, as in OpenGL spec.
int = obj.GetType ()
- Get the type with which the data is loaded into the GPU.
eg. VTK_FLOAT for float32, VTK_CHAR for byte, VTK_UNSIGNED_CHAR for
unsigned byte etc.
int = obj.GetSize ()
- Get the size of the data loaded into the GPU. Size is in the number of
elements of the uploaded Type.
int = obj.GetHandle ()
- Get the openGL buffer handle.
obj.BindToPackedBuffer ()
obj.BindToUnPackedBuffer ()
- Inactivate the buffer.
obj.UnBind ()
- Inactivate the buffer.