How to replace those DirectX functions by OpenGL

I need to replace some DirectX functions by using OpenGL. Since I don’t know anything about DirectX, I have very hard time with them.
m_device->SetTexture(0, NULL);
m_device->SetRenderState(D3DRS_AMBIENT, 0x00202020);
m_device->SetStreamSource(0, m_buffer, sizeof(buffer));
m_device->SetIndices(m_buffer, 0L);
m_device->DrawIndexPrimitive(D3DPT_TRIANGLELIST, 0, m_points, 0, m_itris);

I built a vertex array to replace m_buffer and I built a index array also. Other than that, I really don’t understand what are SetStreamSource,SetVertexShader,SetIndices,DrawIndexPrimitive for.
Please help me out with those functions.

Have you tried the DirectX documentation ?