diff --git a/clutter/clutter-alpha.c b/clutter/clutter-alpha.c
index 3e4df4d..74a5c7a 100644
--- a/clutter/clutter-alpha.c
+++ b/clutter/clutter-alpha.c
@@ -694,6 +694,11 @@ clutter_ramp_func (ClutterAlpha *alpha,
     }
 }
 
+#if 0
+/*
+ * The following three functions are left in place for reference
+ * purposes.
+ */
 static guint32
 sincx1024_func (ClutterAlpha *alpha, 
 		ClutterAngle  angle,
@@ -713,7 +718,7 @@ sincx1024_func (ClutterAlpha *alpha,
 
   x -= (512 * 512 / angle);
   
-  sine = ((sinf (x) + offset) / 2)
+  sine = ((cogl_angle_sin (x) + offset) / 2)
        * CLUTTER_ALPHA_MAX_ALPHA;
 
   sine = sine >> COGL_FIXED_Q;
@@ -721,11 +726,6 @@ sincx1024_func (ClutterAlpha *alpha,
   return sine;
 }
 
-#if 0
-/*
- * The following two functions are left in place for reference
- * purposes.
- */
 static guint32
 sincx_func (ClutterAlpha *alpha, 
 	    ClutterFixed  angle,
@@ -744,7 +744,7 @@ sincx_func (ClutterAlpha *alpha,
   x = CLUTTER_FIXED_MUL (x, CFX_PI)
     - CLUTTER_FIXED_DIV (CFX_PI, angle);
 
-  sine = (sinf (x) + offset) / 2;
+  sine = (cogl_angle_sin (x) + offset) / 2;
 
   CLUTTER_NOTE (ALPHA, "sine: %2f\n", CLUTTER_FIXED_TO_DOUBLE (sine));
 
@@ -803,9 +803,25 @@ guint32
 clutter_sine_func (ClutterAlpha *alpha,
                    gpointer      dummy)
 {
-#if 0
+#if 1
+  ClutterTimeline *timeline;
+  gint current_frame_num, n_frames;
+  float radians, sine;
+  
+  timeline = clutter_alpha_get_timeline (alpha);
+
+  current_frame_num = clutter_timeline_get_current_frame (timeline);
+  n_frames = clutter_timeline_get_n_frames (timeline);
+
+  radians = ((float)current_frame_num / n_frames) * (2.0 * G_PI);
+  sine = sinf (radians);
+
+  CLUTTER_NOTE (ALPHA, "sine: %2f\n", sine);
+
+  return COGL_FLOAT_TO_INT ((sine * CLUTTER_ALPHA_MAX_ALPHA));
+#elif 0
     return sinc_func (alpha, 2.0, 1.0);
-#else
+#elif 0
     /* 2.0 above represents full circle */
     return sincx1024_func (alpha, 1024, 1.0);
 #endif
@@ -839,18 +855,17 @@ clutter_sine_inc_func (ClutterAlpha *alpha,
   ClutterTimeline * timeline;
   gint              frame;
   gint              n_frames;
-  ClutterAngle      x;
-  ClutterFixed      sine;
+  float             radians;
+  float             sine;
   
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
   n_frames = clutter_timeline_get_n_frames (timeline);
 
-  x = 256 * frame / n_frames;
-
-  sine = sinf (x) * CLUTTER_ALPHA_MAX_ALPHA;
+  radians = ((float)frame / n_frames) * (G_PI / 2);
+  sine = sinf (radians);
 
-  return ((guint32) sine) >> COGL_FIXED_Q;
+  return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
 }
 
 /**
@@ -881,18 +896,17 @@ clutter_sine_dec_func (ClutterAlpha *alpha,
   ClutterTimeline * timeline;
   gint              frame;
   gint              n_frames;
-  ClutterAngle      x;
-  ClutterFixed      sine;
+  float             radians;
+  float             sine;
   
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
   n_frames = clutter_timeline_get_n_frames (timeline);
 
-  x = 256 * frame / n_frames + 256;
-
-  sine = sinf (x) * CLUTTER_ALPHA_MAX_ALPHA;
+  radians = ((float)frame / n_frames) * (G_PI / 2);
+  sine = sinf (radians + (G_PI / 2));
 
-  return ((guint32) sine) >> COGL_FIXED_Q;
+  return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
 }
 
 /**
@@ -923,18 +937,17 @@ clutter_sine_half_func (ClutterAlpha *alpha,
   ClutterTimeline *timeline;
   gint             frame;
   gint             n_frames;
-  ClutterAngle     x;
-  ClutterFixed     sine;
+  float            radians;
+  float            sine;
   
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
   n_frames = clutter_timeline_get_n_frames (timeline);
 
-  x = 512 * frame / n_frames;
+  radians = ((float)frame / n_frames) * G_PI;
+  sine = sinf (radians);
 
-  sine = sinf (x) * CLUTTER_ALPHA_MAX_ALPHA;
-
-  return ((guint32) sine) >> COGL_FIXED_Q;
+  return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
 }
 
 /**
@@ -959,19 +972,17 @@ clutter_sine_in_func (ClutterAlpha *alpha,
   ClutterTimeline *timeline;
   gint             frame;
   gint             n_frames;
-  ClutterAngle     x;
-  ClutterFixed     sine;
+  float            radians;
+  float            sine;
 
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
   n_frames = clutter_timeline_get_n_frames (timeline);
 
-  /* XXX- if we use 768 we overflow */
-  x = 256 * frame / n_frames + 767;
-
-  sine = (sinf (x) + 1) * CLUTTER_ALPHA_MAX_ALPHA;
+  radians = ((float)frame / n_frames) * (G_PI / 2);
+  sine = sinf (radians - (G_PI / 2)) + 1.0;
 
-  return ((guint32) sine) >> COGL_FIXED_Q;
+  return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
 }
 
 /**
@@ -995,18 +1006,17 @@ clutter_sine_out_func (ClutterAlpha *alpha,
   ClutterTimeline *timeline;
   gint             frame;
   gint             n_frames;
-  ClutterAngle     x;
-  ClutterFixed     sine;
+  float            radians;
+  float            sine;
 
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
   n_frames = clutter_timeline_get_n_frames (timeline);
 
-  x = 256 * frame / n_frames;
-
-  sine = sinf (x) * CLUTTER_ALPHA_MAX_ALPHA;
+  radians = ((float)frame / n_frames) * (G_PI / 2);
+  sine = sinf (radians);
 
-  return ((guint32) sine) >> COGL_FIXED_Q;
+  return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
 }
 
 /**
@@ -1031,18 +1041,17 @@ clutter_sine_in_out_func (ClutterAlpha *alpha,
   ClutterTimeline *timeline;
   gint             frame;
   gint             n_frames;
-  ClutterAngle     x;
-  ClutterFixed     sine;
+  float            radians;
+  float            sine;
 
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
   n_frames = clutter_timeline_get_n_frames (timeline);
 
-  x = -256 * frame / n_frames + 256;
+  radians = ((float)frame / n_frames) * G_PI;
+  sine = (sinf (radians - (G_PI / 2)) + 1.0) / 2.0;
 
-  sine = (sinf (x) + 1) / 2 * CLUTTER_ALPHA_MAX_ALPHA;
-
-  return ((guint32) sine) >> COGL_FIXED_Q;
+  return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
 }
 
 /**
@@ -1201,9 +1210,9 @@ clutter_exp_inc_func (ClutterAlpha *alpha,
    * 
    *   (2^x_alpha_max) - 1 == CLUTTER_ALPHA_MAX_ALPHA
    */
-#if CLUTTER_ALPHA_MAX_ALPHA != 0xffff
-#error Adjust x_alpha_max to match CLUTTER_ALPHA_MAX_ALPHA
-#endif
+  /* XXX: If this fails:
+   * Adjust x_alpha_max to match CLUTTER_ALPHA_MAX_ALPHA */
+  g_assert (CLUTTER_ALPHA_MAX_ALPHA == 65535.0);
   
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
@@ -1211,7 +1220,7 @@ clutter_exp_inc_func (ClutterAlpha *alpha,
 
   x =  x_alpha_max * frame / n_frames;
 
-  result = CLAMP (pow2f (x) - 1, 0, CLUTTER_ALPHA_MAX_ALPHA);
+  result = CLAMP (powf (2, x) - 1, 0, CLUTTER_ALPHA_MAX_ALPHA);
 
   return result;
 }
@@ -1252,9 +1261,9 @@ clutter_exp_dec_func (ClutterAlpha *alpha,
    * 
    *   (2^x_alpha_max) - 1 == CLUTTER_ALPHA_MAX_ALPHA
    */
-#if CLUTTER_ALPHA_MAX_ALPHA != 0xffff
-#error Adjust x_alpha_max to match CLUTTER_ALPHA_MAX_ALPHA
-#endif
+  /* XXX: If this fails:
+   * Adjust x_alpha_max to match CLUTTER_ALPHA_MAX_ALPHA */
+  g_assert (CLUTTER_ALPHA_MAX_ALPHA == 65535.0);
   
   timeline = clutter_alpha_get_timeline (alpha);
   frame    = clutter_timeline_get_current_frame (timeline);
@@ -1262,7 +1271,7 @@ clutter_exp_dec_func (ClutterAlpha *alpha,
 
   x =  (x_alpha_max * (n_frames - frame)) / n_frames;
 
-  result = CLAMP (pow2f (x) - 1, 0, CLUTTER_ALPHA_MAX_ALPHA);
+  result = CLAMP (powf (2, x) - 1, 0, CLUTTER_ALPHA_MAX_ALPHA);
 
   return result;
 }