openGL Color Gradient with exponential behavior?

advanced
#1

Hello people!

I had this doubt while I was drawing a few GL_QUADS with a color gradient. I know that if I use something like the following I get a quad with a linear gradient from white to black.

  
  
glBegin(GL_QUADS);  
    glColor3f( 1.0f, 1.0f, 1.0f);  
    glVertex2f(    0,    0);  
    glVertex2f( 100,    0);  
    glColor3f( 0.0f, 0.0f, 0.0f);  
    glVertex2f( 100, 100);  
    glVertex2f(    0, 100);  
glEnd

What I wanted to know is how can I make the gradient be expontential? The idea being that the 50% grey is NOT in the middle of the QUAD but somewhere else according to a defined formula.
Since openGL does the gradient by itself I had to ask!

Thanks!

#2

I don’t think there is a way to change the way openGL interpolates values across vertices. What you could do though, is add more vertices with varying colors in between the vertices you have right now.

#3

Thanks daanvanhasselt! =D
I’ll have to find another way of doing it then.