In/Out Variables and Provoking Vertex

Exercises

1. Replace the red color in the fragment shader with the varying in variable var_color.
2. Add a second triangle with indices 2, 1, 3.
3. Put the keyword flat in front of the var_color variable in the vertex and fragment shaders. However, do not put it in front of the out variable in the fragment shader!
• Try changing the order of the indices used to draw the triangle. What happens?