press 's' to toggle smoothing

progs/trivial/point-wide.c

@@ -33,6 +33,8 @@
 
 
 GLenum doubleBuffer;
+static GLboolean smooth = GL_FALSE;
+
 
 static void Init(void)
 {
@@ -58,6 +60,9 @@ static void Key(unsigned char key, int x, int y)
 {
 
     switch (key) {
+     case 's':
+        smooth = !smooth;
+        break;
       case 27:
 	exit(1);
       default:
@@ -73,6 +78,16 @@ static void Draw(void)
 
    glPointSize(8.0);
 
+   if (smooth) {
+      glEnable(GL_POINT_SMOOTH);
+      glEnable(GL_BLEND);
+      glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+   }
+   else {
+      glDisable(GL_POINT_SMOOTH);
+      glDisable(GL_BLEND);
+   }
+
    glBegin(GL_POINTS);
    glColor3f(1,0,0); 
    glVertex3f( 0.9, -0.9, -30.0);