From 92eddb0fd404624ca198f19e4088927701eec7f5 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Sun, 9 Jan 2005 17:37:50 +0000
Subject: better animate rate (Marcelo Magallon)

---
 progs/demos/pointblast.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

(limited to 'progs/demos/pointblast.c')

diff --git a/progs/demos/pointblast.c b/progs/demos/pointblast.c
index 14e9cf359f..715813f176 100644
--- a/progs/demos/pointblast.c
+++ b/progs/demos/pointblast.c
@@ -79,7 +79,6 @@ static float float_rand(void) { return rand() / (float) RAND_MAX; }
 
 #define MEAN_VELOCITY 3.0
 #define GRAVITY 2.0
-#define TIME_DELTA 0.025  /* The speed of time. */
 
 /* Modeling units of ground extent in each X and Z direction. */
 #define EDGE 12
@@ -114,6 +113,13 @@ updatePointList(void)
   float distance;
   int i;
 
+  static double t0 = -1.;
+  double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+  if (t0 < 0.0)
+    t0 = t;
+  dt = t - t0;
+  t0 = t;
+
   motion = 0;
   for (i=0; i<numPoints; i++) {
     distance = pointVelocity[i][0] * theTime;
@@ -139,9 +145,9 @@ updatePointList(void)
       pointTime[i] = 0.0;  /* Reset the particles sense of up time. */
     }
     motion = 1;
-    pointTime[i] += TIME_DELTA;
+    pointTime[i] += dt;
   }
-  theTime += TIME_DELTA;
+  theTime += dt;
   if (!motion && !spin) {
     if (repeat) {
       makePointList();
@@ -264,7 +270,7 @@ menu(int option)
   case 0:
     makePointList();
     break;
-#if GL_ARB_point_parameters
+#ifdef GL_ARB_point_parameters
   case 1:
     glPointParameterfvARB(GL_POINT_DISTANCE_ATTENUATION_ARB, constant);
     break;
@@ -281,7 +287,7 @@ menu(int option)
   case 5:
     blend = 0;
     break;
-#if GL_ARB_point_parameters
+#ifdef GL_ARB_point_parameters
   case 6:
     glPointParameterfARB(GL_POINT_FADE_THRESHOLD_SIZE_ARB, 1.0);
     break;
-- 
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