draw a quad

opengl/vertex.glsl

@@ -2,9 +2,13 @@
 
 // use the input ("in") vertices from index zero
 layout(location = 0) in vec4 position;
+layout(location = 1) in vec4 color;
+
+smooth out vec4 out_color;
 
 void main()
 {
 	// simply copy teh output position
 	gl_Position = position;
+	out_color = color;
 }