draw_elements: Separate count from the (optional) element list. Allows buffered drawing.

[robn]

No description provided.

[pcwalton]

Couldn't the caller just use .slice() on the buffer before passing to draw_elements()?

[robn]

No. There is no buffer - its already been submitted to the GPU at startup. The render mainloop looks something like:

gl2::bind_buffer(gl2::ARRAY_BUFFER, vertex_buffer_id);
gl2::bind_buffer(gl2::ELEMENT_ARRAY_BUFFER, element_buffer_id);
gl2::draw_elements(gl2::TRIANGLE_STRIP, count, gl2::UNSIGNED_SHORT, None);

(Actual example in robn/rust-hello-gl)