From 79df97d19223ca6d1957a9bdf8186d112db748a5 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+hg@gmail.com>
Date: Wed, 24 Nov 2010 14:41:13 -0500
Subject: [PATCH] added timekeeping and rotating orange quad by time

---
 dwss.cc | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/dwss.cc b/dwss.cc
index 8cdd288..9debf9a 100644
--- a/dwss.cc
+++ b/dwss.cc
@@ -28,6 +28,7 @@
 #include <stdlib.h>
 #include <sysexits.h>
 #include <time.h>
+#include <sys/time.h>
 
 #include <glib.h>
 #include <glib/gi18n.h>
@@ -40,6 +41,7 @@
 #include <gtk/gtkgl.h>
 
 #include <GL/gl.h>
+#include <GL/glu.h>
 
 #include "gs-theme-window.h"
 
@@ -52,6 +54,16 @@ static GOptionEntry options[] = {
        {NULL}
 };
 
+static uint64_t start_msec;
+
+static uint32_t getElapsedTime()
+{
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    uint64_t msec = tv.tv_sec + tv.tv_usec / 1000;
+    return msec - start_msec;
+}
+
 static gboolean
 expose (GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 {
@@ -63,6 +75,10 @@ expose (GtkWidget *da, GdkEventExpose *event, gpointer user_data)
         g_assert_not_reached();
     }
 
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    glPushMatrix();
+    glRotatef(getElapsedTime()/1000.0*360.0, 0, 0, 1);
     glBegin(GL_QUADS);
     glColor3f(1, 0.6, 0);
     glNormal3f(0, 0, 1);
@@ -71,6 +87,7 @@ expose (GtkWidget *da, GdkEventExpose *event, gpointer user_data)
     glVertex2f(-1, -1);
     glVertex2f(1, 0);
     glEnd();
+    glPopMatrix();
 
     if (gdk_gl_drawable_is_double_buffered(gldrawable))
         gdk_gl_drawable_swap_buffers(gldrawable);
@@ -97,8 +114,14 @@ configure (GtkWidget *da, GdkEventConfigure *event, gpointer user_data)
 
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
+    gluPerspective(60.0,
+            (double)da->allocation.width / (double)da->allocation.height,
+            0.001,
+            1000.0);
 
     glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef(0, 0, -2);
 
     glShadeModel(GL_SMOOTH);
 
@@ -182,6 +205,10 @@ main (int   argc,
 
     gtk_timeout_add(12, update, NULL);
 
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    start_msec = tv.tv_sec + tv.tv_usec / 1000;
+
     gtk_main ();
 
     return EX_OK;