Implement OpengL extension handling through new header file dmglexts.h to "define" the entrypoints we require and some wonderful preprocessor macro magic to add checks for them via SDL_GL_ExtensionSupported() and initialize function pointers with SDL_GL_GetProcAddress().

varying vec3 snormal;
varying vec3 svertex;


void main(void)
{
   svertex = vec3(gl_ModelViewMatrix * gl_Vertex);
   snormal = normalize(gl_NormalMatrix * gl_Normal);

   gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}