|   | 86 | === Exercise #1: === | 
                  
                          |   | 87 |  1. Add RGB color to vertices with {{{ glColor3f(1.0, 0.4, 1.0);}}}. | 
                  
                          |   | 88 |  2. Replace single line drawing in {{{display}}} with the following snippet | 
                  
                          |   | 89 |  {{{ | 
                  
                          |   | 90 | #!c | 
                  
                          |   | 91 |    GLfloat vertices[][2] = { | 
                  
                          |   | 92 |     { -0.90, -0.90 }, // Triangle 1 | 
                  
                          |   | 93 |     {  0.85, -0.90 }, | 
                  
                          |   | 94 |     { -0.90,  0.85 }, | 
                  
                          |   | 95 |     {  0.90, -0.85 }, // Triangle 2 | 
                  
                          |   | 96 |     {  0.90,  0.90 }, | 
                  
                          |   | 97 |     { -0.85,  0.90 } | 
                  
                          |   | 98 |    }; | 
                  
                          |   | 99 | }}} | 
                  
                          |   | 100 |  and try to draw two wireframe triangles in a loop. Change primitive to {{{GL_LINE_LOOP}}}. | 
                  
                          |   | 101 |  3. Draw two primitives with {{{GL_TRIANGLES}}}. | 
                  
                          |   | 102 |  | 
                  
                          |   | 103 |  | 
                  
                          |   | 104 |  |