add Starfield class

dwss.cc

@@ -35,6 +35,7 @@ int main (int argc, char *argv[])
     GnomeScreensaver gs(&argc, &argv, configure, expose, update, 12);
 
     Mode *modes[] = {
+        new Starfield(),
         new Spin(),
         new Flip()
     };

modes/Starfield.cc

@@ -0,0 +1,67 @@
+
+#include <stdlib.h>
+#include <time.h>
+#include <math.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+#include "Starfield.h"
+
+Starfield::Starfield()
+{
+    m_last_ticks = 0;
+    srand(time(NULL) + getpid());
+}
+
+Starfield::~Starfield()
+{
+}
+
+bool Starfield::expose (GnomeScreensaver & gs)
+{
+    if (m_last_ticks == 0)
+        m_last_ticks = gs.getTicks();
+
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glViewport(0, 0, gs.getWidth(), gs.getHeight());
+
+    glPushMatrix();
+    glTranslatef(0, 0, -30);
+    m_logobox.draw();
+    glPopMatrix();
+
+    m_last_ticks = gs.getTicks();
+
+    return true;
+}
+
+bool Starfield::configure (GnomeScreensaver & gs)
+{
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(60.0, gs.getAspectRatio(), 0.01, 1000.0);
+
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    gluLookAt(0, 0, 0, 0, 0, -1, 0, 1, 0);
+
+    return true;
+}
+
+bool Starfield::update (GnomeScreensaver & gs)
+{
+    return true;
+}
+
+void Starfield::getRandomAxis(float (*axis)[3])
+{
+    double alpha = rand() / (double)RAND_MAX * 2.0 * M_PI;
+    double beta = rand() / (double)RAND_MAX * M_PI;
+    (*axis)[0] = cos(alpha) * sin(beta);
+    (*axis)[1] = sin(alpha) * sin(beta);
+    (*axis)[2] = cos(beta);
+}
+

modes/Starfield.h

@@ -0,0 +1,24 @@
+
+#ifndef STARFIELD_H
+#define STARFIELD_H
+
+#include "LogoBox.h"
+#include "Mode.h"
+#include "GnomeScreensaver.h"
+
+class Starfield : public Mode
+{
+    public:
+        Starfield();
+        ~Starfield();
+        bool expose (GnomeScreensaver & gs);
+        bool configure (GnomeScreensaver & gs);
+        bool update (GnomeScreensaver & gs);
+    protected:
+        LogoBox m_logobox;
+        uint64_t m_last_ticks;
+        void getRandomAxis(float (*axis)[3]);
+};
+
+#endif /* STARFIELD_H */
+