mirror of
https://github.com/brl/mutter.git
synced 2024-11-23 08:30:42 -05:00
[clutter-alpha.c.0.patch] Normalizes sine values [0,1] before calculating alpha
The previous patch broke some of the normalization done before the sine value gets multiplied with CLUTTER_ALPHA_MAX. This e.g. broke test-actors when sine values went through to -1, as the o-hands were scaled so large all you saw was the red 'O'.
This commit is contained in:
Robert Bragg
parent
e8915fcb12
commit
e42d756a69
@ -1,5 +1,5 @@
|
||||
diff --git a/clutter/clutter-alpha.c b/clutter/clutter-alpha.c
|
||||
index 3e4df4d..74a5c7a 100644
|
||||
index 3e4df4d..d508631 100644
|
||||
--- a/clutter/clutter-alpha.c
|
||||
+++ b/clutter/clutter-alpha.c
|
||||
@@ -694,6 +694,11 @@ clutter_ramp_func (ClutterAlpha *alpha,
|
||||
@ -44,7 +44,7 @@ index 3e4df4d..74a5c7a 100644
|
||||
|
||||
CLUTTER_NOTE (ALPHA, "sine: %2f\n", CLUTTER_FIXED_TO_DOUBLE (sine));
|
||||
|
||||
@@ -803,9 +803,25 @@ guint32
|
||||
@@ -803,9 +803,28 @@ guint32
|
||||
clutter_sine_func (ClutterAlpha *alpha,
|
||||
gpointer dummy)
|
||||
{
|
||||
@ -62,9 +62,12 @@ index 3e4df4d..74a5c7a 100644
|
||||
+ radians = ((float)current_frame_num / n_frames) * (2.0 * G_PI);
|
||||
+ sine = sinf (radians);
|
||||
+
|
||||
+ /* shift from range [-1, 1] -> [0, 1] */
|
||||
+ sine = (sine + 1.0) / 2.0;
|
||||
+
|
||||
+ CLUTTER_NOTE (ALPHA, "sine: %2f\n", sine);
|
||||
+
|
||||
+ return COGL_FLOAT_TO_INT ((sine * CLUTTER_ALPHA_MAX_ALPHA));
|
||||
+ return sine * CLUTTER_ALPHA_MAX_ALPHA;
|
||||
+#elif 0
|
||||
return sinc_func (alpha, 2.0, 1.0);
|
||||
-#else
|
||||
@ -72,7 +75,7 @@ index 3e4df4d..74a5c7a 100644
|
||||
/* 2.0 above represents full circle */
|
||||
return sincx1024_func (alpha, 1024, 1.0);
|
||||
#endif
|
||||
@@ -839,18 +855,17 @@ clutter_sine_inc_func (ClutterAlpha *alpha,
|
||||
@@ -839,18 +858,17 @@ clutter_sine_inc_func (ClutterAlpha *alpha,
|
||||
ClutterTimeline * timeline;
|
||||
gint frame;
|
||||
gint n_frames;
|
||||
@ -86,17 +89,17 @@ index 3e4df4d..74a5c7a 100644
|
||||
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);
|
||||
|
||||
- sine = sinf (x) * CLUTTER_ALPHA_MAX_ALPHA;
|
||||
-
|
||||
- return ((guint32) sine) >> COGL_FIXED_Q;
|
||||
+ return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -881,18 +896,17 @@ clutter_sine_dec_func (ClutterAlpha *alpha,
|
||||
@@ -881,18 +899,17 @@ clutter_sine_dec_func (ClutterAlpha *alpha,
|
||||
ClutterTimeline * timeline;
|
||||
gint frame;
|
||||
gint n_frames;
|
||||
@ -120,7 +123,7 @@ index 3e4df4d..74a5c7a 100644
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -923,18 +937,17 @@ clutter_sine_half_func (ClutterAlpha *alpha,
|
||||
@@ -923,18 +940,17 @@ clutter_sine_half_func (ClutterAlpha *alpha,
|
||||
ClutterTimeline *timeline;
|
||||
gint frame;
|
||||
gint n_frames;
|
||||
@ -134,17 +137,17 @@ index 3e4df4d..74a5c7a 100644
|
||||
n_frames = clutter_timeline_get_n_frames (timeline);
|
||||
|
||||
- x = 512 * frame / n_frames;
|
||||
-
|
||||
- sine = sinf (x) * CLUTTER_ALPHA_MAX_ALPHA;
|
||||
+ 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,
|
||||
@@ -959,19 +975,20 @@ clutter_sine_in_func (ClutterAlpha *alpha,
|
||||
ClutterTimeline *timeline;
|
||||
gint frame;
|
||||
gint n_frames;
|
||||
@ -159,17 +162,19 @@ index 3e4df4d..74a5c7a 100644
|
||||
|
||||
- /* 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;
|
||||
+ sine = sinf (radians - (G_PI / 2));
|
||||
|
||||
- sine = (sinf (x) + 1) * CLUTTER_ALPHA_MAX_ALPHA;
|
||||
+ /* shift from range [-1, 0] -> [0, 1] */
|
||||
+ sine = sine + 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,
|
||||
@@ -995,18 +1012,17 @@ clutter_sine_out_func (ClutterAlpha *alpha,
|
||||
ClutterTimeline *timeline;
|
||||
gint frame;
|
||||
gint n_frames;
|
||||
@ -183,17 +188,17 @@ index 3e4df4d..74a5c7a 100644
|
||||
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);
|
||||
|
||||
- sine = sinf (x) * CLUTTER_ALPHA_MAX_ALPHA;
|
||||
-
|
||||
- return ((guint32) sine) >> COGL_FIXED_Q;
|
||||
+ return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -1031,18 +1041,17 @@ clutter_sine_in_out_func (ClutterAlpha *alpha,
|
||||
@@ -1031,18 +1047,20 @@ clutter_sine_in_out_func (ClutterAlpha *alpha,
|
||||
ClutterTimeline *timeline;
|
||||
gint frame;
|
||||
gint n_frames;
|
||||
@ -208,16 +213,18 @@ index 3e4df4d..74a5c7a 100644
|
||||
|
||||
- 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 (radians - (G_PI / 2));
|
||||
|
||||
- sine = (sinf (x) + 1) / 2 * CLUTTER_ALPHA_MAX_ALPHA;
|
||||
-
|
||||
+ /* shift from range [-1, 1] -> [0, 1] */
|
||||
+ sine = (sine + 1.0) / 2.0;
|
||||
|
||||
- return ((guint32) sine) >> COGL_FIXED_Q;
|
||||
+ return (guint32) (sine * CLUTTER_ALPHA_MAX_ALPHA);
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -1201,9 +1210,9 @@ clutter_exp_inc_func (ClutterAlpha *alpha,
|
||||
@@ -1201,9 +1219,9 @@ clutter_exp_inc_func (ClutterAlpha *alpha,
|
||||
*
|
||||
* (2^x_alpha_max) - 1 == CLUTTER_ALPHA_MAX_ALPHA
|
||||
*/
|
||||
@ -230,7 +237,7 @@ index 3e4df4d..74a5c7a 100644
|
||||
|
||||
timeline = clutter_alpha_get_timeline (alpha);
|
||||
frame = clutter_timeline_get_current_frame (timeline);
|
||||
@@ -1211,7 +1220,7 @@ clutter_exp_inc_func (ClutterAlpha *alpha,
|
||||
@@ -1211,7 +1229,7 @@ clutter_exp_inc_func (ClutterAlpha *alpha,
|
||||
|
||||
x = x_alpha_max * frame / n_frames;
|
||||
|
||||
@ -239,7 +246,7 @@ index 3e4df4d..74a5c7a 100644
|
||||
|
||||
return result;
|
||||
}
|
||||
@@ -1252,9 +1261,9 @@ clutter_exp_dec_func (ClutterAlpha *alpha,
|
||||
@@ -1252,9 +1270,9 @@ clutter_exp_dec_func (ClutterAlpha *alpha,
|
||||
*
|
||||
* (2^x_alpha_max) - 1 == CLUTTER_ALPHA_MAX_ALPHA
|
||||
*/
|
||||
@ -252,7 +259,7 @@ index 3e4df4d..74a5c7a 100644
|
||||
|
||||
timeline = clutter_alpha_get_timeline (alpha);
|
||||
frame = clutter_timeline_get_current_frame (timeline);
|
||||
@@ -1262,7 +1271,7 @@ clutter_exp_dec_func (ClutterAlpha *alpha,
|
||||
@@ -1262,7 +1280,7 @@ clutter_exp_dec_func (ClutterAlpha *alpha,
|
||||
|
||||
x = (x_alpha_max * (n_frames - frame)) / n_frames;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user