opengl - What's the purpose of glVertexPointer? -

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i looking @ particles examples of cuda , couldn't find make link between array of vertices , variables in shader. i've read , way i've been doing is

... glgenbuffers(1, &vbo); glbindbuffer(gl_array_buffer, vbo); glbufferdata( ... ) glenablevertexattribarray(0); glvertexattribpointer( ... ); ...

however found in nvidia's example looks like

glbindbufferarb(gl_array_buffer_arb, m_vbo); glvertexpointer(4, gl_float, 0, 0); glenableclientstate(gl_vertex_array);  if (m_colorvbo) {     glbindbufferarb(gl_array_buffer_arb, m_colorvbo);     glcolorpointer(4, gl_float, 0, 0);     glenableclientstate(gl_color_array); }  gldrawarrays(gl_points, 0, m_numparticles);  glbindbufferarb(gl_array_buffer_arb, 0); gldisableclientstate(gl_vertex_array); gldisableclientstate(gl_color_array);

which believe similar do. questions are

  1. what's difference between 2 ways of passing data shader?
  2. should prefer 1 on other?

the first way modern, generic way of sending attributes. second 1 older, vertices, normals, colors etc. had own hard-coded attributes. should not used in modern code.


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