initialize stars array

dwss.cc

@@ -35,7 +35,7 @@ int main (int argc, char *argv[])
     GnomeScreensaver gs(&argc, &argv, configure, expose, update, 12);
 
     Mode *modes[] = {
-        new Starfield(),
+        new Starfield(gs),
         new Spin(),
         new Flip()
     };

modes/Starfield.cc

@@ -10,10 +10,13 @@
 
 #include "Starfield.h"
 
-Starfield::Starfield()
+Starfield::Starfield(GnomeScreensaver & gs)
 {
-    m_last_ticks = 0;
+    uint64_t ticks = gs.getTicks();
+    m_last_ticks = ticks;
     srand(time(NULL) + getpid());
+    for (int i = 0; i < NUM_STARS; i++)
+        newStar(i, ticks);
 }
 
 Starfield::~Starfield()
@@ -22,8 +25,7 @@ Starfield::~Starfield()
 
 bool Starfield::expose (GnomeScreensaver & gs)
 {
-    if (m_last_ticks == 0)
+    uint64_t ticks = gs.getTicks();
-        m_last_ticks = gs.getTicks();
 
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glViewport(0, 0, gs.getWidth(), gs.getHeight());
@@ -42,7 +44,7 @@ bool Starfield::configure (GnomeScreensaver & gs)
 {
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
-    gluPerspective(60.0, gs.getAspectRatio(), 0.01, 1000.0);
+    gluPerspective(60.0, gs.getAspectRatio(), 0.01, MAX_STAR_DIST);
 
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
@@ -65,3 +67,8 @@ void Starfield::getRandomAxis(float (*axis)[3])
     (*axis)[2] = cos(beta);
 }
 
+void Starfield::newStar(int idx, uint64_t ticks)
+{
+    m_stars[idx].create_time = ticks;
+    getRandomAxis(&m_stars[idx].axis);
+}

modes/Starfield.h

@@ -6,18 +6,29 @@
 #include "Mode.h"
 #include "GnomeScreensaver.h"
 
+#define NUM_STARS 1000
+#define MAX_STAR_DIST 1000
+
 class Starfield : public Mode
 {
     public:
-        Starfield();
+        Starfield(GnomeScreensaver & gs);
         ~Starfield();
         bool expose (GnomeScreensaver & gs);
         bool configure (GnomeScreensaver & gs);
         bool update (GnomeScreensaver & gs);
+        class Star
+        {
+            public:
+                float axis[3];
+                uint64_t create_time;
+        };
     protected:
         LogoBox m_logobox;
         uint64_t m_last_ticks;
+        Star m_stars[NUM_STARS];
         void getRandomAxis(float (*axis)[3]);
+        void newStar(int idx, uint64_t ticks);
 };
 
 #endif /* STARFIELD_H */