OpenGL: Sending RGBA color struct into glColor*() as one parameter?

Question

Is there some way to send a struct like:

struct COLOR {
    float r, g, b, a;
};

directly into glColor*() function as one parameter? Would make the code nicer.

I could make own function and send separetely each R,G,B,A values onto glColor4f() but that wouldnt be that nice. So im looking a way to send it the most optimal way as possible.

Answer 1

COLOR color;
glColor4fv((GLfloat*) &color);

Update: I wouldn't recommend creating an inline function, however, you could use GLfloat in your struct to get the expression clearer. Use &color.r to avoid a compiler warning.

struct COLOR {
  GLfloat r,g,b,a;
};
COLOR color;
glColor4fv(&color.r);

Answer 2

The most optimal way of sending vertex data is Vertex Arrays, it will also make your code look nicer, you should take a look.