CGAL::Three::Vbo Struct Reference

#include <CGAL/Three/Buffer_objects.h>

Definition

The Vbo struct is a wrapper for the QOpenGLBufferObject item.

It contains the data necessary for the rendering of any displayed entity. A Vbo can be shared between Vaos of the same context.

Public Member Functions
	Vbo (const char *attribute, Flag flag, QOpenGLBuffer::Type vbo_type=QOpenGLBuffer::VertexBuffer, GLenum data_type=GL_FLOAT, int offset=0, int tupleSize=3, int stride=0)
	Creates a Vbo. More...
bool	bind ()
	Makes the Vbo active until release() is called.
void	release ()
	Makes the Vbo and its program not active.
void	allocate (void *data, int datasize)
	allocate gives CPU data to the GPU. More...

Constructor & Destructor Documentation

Vbo()

CGAL::Three::Vbo::Vbo	(	const char *	attribute,
		Flag	flag,
		QOpenGLBuffer::Type	vbo_type = QOpenGLBuffer::VertexBuffer,
		GLenum	data_type = GL_FLOAT,
		int	offset = 0,
		int	tupleSize = 3,
		int	stride = 0
	)

Creates a Vbo.

Parameters

attribute	the name of the corresponding data in the shader.
flag	the flag that specifies which type of data this corresponds to.
vbo_type	is almost always QOpenGLBuffer::VertexBuffer but can be QOpenGLBuffer::IndexBuffer if it contains the indices for an indexed rendering.
data_type	the GL data type. Mostly GL_FLOAT.
offset	the offset in the buffer. See OpenGL documentation.
tupleSize	the size of the tuple. If it contains vector_3s, then tuple_size is 3.
stride	the stride for the buffer. See OpenGL documentation.

Attention

This must be called within a valid OpenGLContext. Most of the time, initGL() functions are safe places to do so.

Member Function Documentation

allocate()

void CGAL::Three::Vbo::allocate	(	void *	data,
		int	datasize
	)

allocate gives CPU data to the GPU.

Parameters

data	the content of the buffer.
datasize	the number of bytes in data.