Does this cause a memory leak?

I create my VBO like this:

glGenBuffersARB(1,&polyvbo);

    glBindBufferARB(GL_ARRAY_BUFFER_ARB,polyvbo);
    glBufferDataARB(GL_ARRAY_BUFFER_ARB,sizeof(GLfloat) * tempvct.size(),&tempvct[0],GL_DYNAMIC_COPY);

Then to update it I just do the same thing:

    glBindBufferARB(GL_ARRAY_BUFFER_ARB,polyvbo);
    glBufferDataARB(GL_ARRAY_BUFFER_ARB,sizeof(GLfloat) * tempvct.size(),&tempvct[0],GL_DYNAMIC_COPY);

(needless to say, the data in tempvct changes)

I'm just wondering if the above produces a memory leak. do I need to delete the vbo and recreate it, or w开发者_运维百科ill it automatically delete the old and update?

Thanks

It doesn't cause a memory leak because the buffer is not reallocated.

But why not use glBufferSubData()? it will probably be much faster and does basically the same thing.

I've entered "glBufferDataARB" into Google and found this as the first hit:

http://www.songho.ca/opengl/gl_vbo.html

I suggest you read it. As I understand it, glGenBuffersARB creates the buffer objects and glDeleteBuffersARB destroys them, so the other two functions simply reuse the existing buffer without modifying its allocation.

See this thread: http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=267373