Spin: change logo to spin on random axis every 5 seconds

dwss.cc

@@ -44,8 +44,8 @@ int main (int argc, char *argv[])
     glEnable(GL_LIGHT0);
     glEnable(GL_DEPTH_TEST);
 
+    modes[0]->configure(gs);
     current_mode = modes[0];
-    current_mode->configure(gs);
 
     gs.mainloop();
 

modes/Spin.cc

@@ -1,27 +1,71 @@
 
+#include <stdlib.h>
+#include <time.h>
+
 #include <GL/gl.h>
 #include <GL/glu.h>
 
 #include "Spin.h"
 
+#define SWITCH_TIME 5000
+
+static const float directions[][3] = {
+    {0, 0, 1}, {0, 0, -1}, {0, 1, 0}, {0, -1, 0}, {1, 0, 0}, {-1, 0, 0}
+};
+
+Spin::Spin()
+{
+    m_num_monitors = 1;
+    m_directions = new int[m_num_monitors];
+    m_directions[0] = 1;
+    m_rotations = new matrix_t[m_num_monitors];
+    glGetFloatv(GL_MODELVIEW_MATRIX, &m_rotations[0][0]);
+    m_last_switch_ticks = 0;
+    m_last_ticks = 0;
+    srand(time(NULL));
+}
+
+Spin::~Spin()
+{
+    delete[] m_directions;
+    delete[] m_rotations;
+}
+
 bool Spin::expose (GnomeScreensaver & gs)
 {
-    int n_monitors = gs.getNumMonitors();
-    int width = gs.getWidth() / n_monitors;
+    if (m_last_ticks == 0)
+        m_last_switch_ticks = m_last_ticks = gs.getTicks();
+    else if (gs.getTicks() - m_last_switch_ticks > SWITCH_TIME)
+    {
+        for (int i = 0; i < m_num_monitors; i++)
+        {
+            m_directions[i] = (int) (rand() / (double)RAND_MAX *
+                    sizeof(directions) / sizeof(directions[0]));
+            if (m_directions[i] >= sizeof(directions) / sizeof(directions[0]))
+                m_directions[i] = 0;
+        }
+        m_last_switch_ticks = gs.getTicks();
+    }
+
+    int width = gs.getWidth() / m_num_monitors;
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-    for (int monitor_num = 0; monitor_num < n_monitors; monitor_num++)
+    for (int monitor_num = 0; monitor_num < m_num_monitors; monitor_num++)
     {
         glViewport(width * monitor_num, 0, width, gs.getHeight());
 
-        glPushMatrix();
+        glLoadMatrixf(&m_rotations[monitor_num][0]);
+
+        int direction = m_directions[monitor_num];
+        glRotatef((gs.getTicks() - m_last_ticks) / 1000.0 * 360.0 / 4.0,
+                directions[direction][0],
+                directions[direction][1],
+                directions[direction][2]);
+        glGetFloatv(GL_MODELVIEW_MATRIX, &m_rotations[monitor_num][0]);
 
-        glRotatef(gs.getTicks() / 1000.0 * 360.0 / 4.0
-                * (monitor_num & 0x1 ? -1.0 : 1.0), 0, 1, 0);
         m_logobox.draw();
-
-        glPopMatrix();
     }
+    m_last_ticks = gs.getTicks();
 
     return true;
 }
@@ -37,6 +81,20 @@ bool Spin::configure (GnomeScreensaver & gs)
     glLoadIdentity();
     gluLookAt(0, 0, 10, 0, 0, 0, 0, 1, 0);
 
+    m_num_monitors = gs.getNumMonitors();
+    delete[] m_directions;
+    delete[] m_rotations;
+    m_directions = new int[m_num_monitors];
+    m_rotations = new matrix_t[m_num_monitors];
+    for (int i = 0; i < m_num_monitors; i++)
+    {
+        m_directions[i] = (int) (rand() / (double)RAND_MAX *
+                sizeof(directions) / sizeof(directions[0]));
+        if (m_directions[i] >= sizeof(directions) / sizeof(directions[0]))
+            m_directions[i] = 0;
+        glGetFloatv(GL_MODELVIEW_MATRIX, &m_rotations[i][0]);
+    }
+
     return true;
 }
 

modes/Spin.h

@@ -9,11 +9,19 @@
 class Spin : public Mode
 {
     public:
+        Spin();
+        ~Spin();
         bool expose (GnomeScreensaver & gs);
         bool configure (GnomeScreensaver & gs);
         bool update (GnomeScreensaver & gs);
+        typedef float matrix_t[16];
     protected:
         LogoBox m_logobox;
+        int * m_directions;
+        matrix_t * m_rotations;
+        int m_num_monitors;
+        unsigned int m_last_switch_ticks;
+        unsigned int m_last_ticks;
 };
 
 #endif /* SPIN_H */