Usage of glBindBufferRange with transform feedback

Question

I have a buffer that I would like to fill over successive transform feedbacks, and I am wondering how exactly to do this.

glBindBufferRange has five arguments, I understand that the first three are equivalent to the arguments of glBindBufferBase, but I have a few questions about the offset and size arguments.

If my first transform feedback produced n primitives, as retrieved from GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN, my primitives are points, and I want to continue from that position in the buffer, should the offset of glBindBufferRange be set to n*4*sizeof(GLfloat)? (assuming I am retrieving a vec4 geometry shader output)

The docs just say that offset and size should be in basic machine units (although they have two different types, GLintptr and GLsizeiptr), but I'm not exactly sure what that means, so I assumed bytes, is this correct?

Answer 1

Yes, the amount of data written to a buffer during transform feedback is the number of primitives written * the number of components of those primitives * the size of a primitive. And yes, "basic machine units" is standardese for "byte".