title: Way to set HLSL constant
body: <p>Is there any way to set HLSL (for example) vertex shader constant from c++ code in opengl-style?
  I mean - no d3dx, no constant-table. Shader is already compiled with fxc.exe and set. Have only LPDIRECT3DVERTEXSHADER9 and LPDIRECT3DDEVICE9. I planned to use <code>SetVertexShaderConstant</code>*, but found no way to translate constant name (for example "u_mvpMatrix") to "Register number that will contain the first constant value.".</p>