Matthew Allum <mallum@o-hand.com> - primary authour
Emmanuele Bassi <ebassi@o-hand.com> - python bindings, gobject/glib mastery
Iain Holmes <iain@o-hand.com> - GTK Clutter widget
-Jorn Baayen <jorn@o-hand.com> - Gstreamer bits
\ No newline at end of file
+Jorn Baayen <jorn@o-hand.com> - Gstreamer bits
+Tomas Frydrych <tf@o-hand.com> - Fixed point magic
+2007-01-17 Tomas Frydrych <tf@openedhand.com>
+ * configure.ac:
+ * clutter/clutter-behavior-path.c:
+ Added --without-fpu option.
+
+ * doc/refrence/tmpl/clutter-fixed.sgml:
+ * clutter/clutter-fixed.c:
+ * clutter/clutter-fixed.h:
+ Documentation for fixed point API.
+
+ * AUTHORS: added self.
+
2007-01-17 Emmanuele Bassi <ebassi@openedhand.com>
* clutter/clutter-feature.h:
if (clutter_knot_equal (begin, end))
return 0;
+#ifdef CFX_NO_FPU
return clutter_sqrti ((end->x - begin->x) * (end->x - begin->x) +
(end->y - begin->y) * (end->y - begin->y));
+#else
+ return (gint) sqrt ((end->x - begin->x) * (end->x - begin->x) +
+ (end->y - begin->y) * (end->y - begin->y));
+#endif
}
static gint
*
* Fixed point implementation of sine function
*
- * Return value: sine value (as fixed point).
+ * Return value: #ClutterFixed sine value.
*
* Since: 0.2
*/
* ClutterAngle is an integer such that 1024 represents
* full circle.
*
- * Return value: sine value (as fixed point).
+ * Return value: #ClutterFixed sine value.
*
* Since: 0.2
*/
*
* A fixed point implementation of squre root
*
- * Return value: square root (as fixed point).
+ * Return value: #ClutterFixed square root.
*
* Since: 0.2
*/
*
* A fixed point implementation of square root for integers
*
- * Return value: square root (as truncated integer).
+ * Return value: integer square root (truncated).
*
*
* Since: 0.2
G_BEGIN_DECLS
+/**
+ * ClutterFixed:
+ *
+ * Fixed point number (16.16)
+ */
typedef gint32 ClutterFixed;
+
+/**
+ * ClutterAngle:
+ *
+ * Integer representation of an agnle such that 1024 corresponds to
+ * fool circle (i.e., 2*Pi).
+ */
typedef gint32 ClutterAngle; /* angle such that 1024 == 2*PI */
#define CFX_Q 16 /* Decimal part size in bits */
/*
* some commonly used constants
*/
+
+/**
+ * CFX_PI:
+ *
+ * Fixed point representation of Pi
+ */
#define CFX_PI 0x0003243f
+/**
+ * CFX_2PI:
+ *
+ * Fixed point representation of Pi*2
+ */
#define CFX_2PI 0x0006487f
+/**
+ * CFX_PI2:
+ *
+ * Fixed point representation of Pi/2
+ */
#define CFX_PI_2 0x00019220 /* pi/2 */
+/**
+ * CFX_PI4:
+ *
+ * Fixed point representation of Pi/4
+ */
#define CFX_PI_4 0x0000c910 /* pi/4 */
-#define CFX_PI8192 0x6487ed51 /* pi * 0x2000, to improve precision */
-
+/**
+ * CFX_360:
+ *
+ * Fixed point representation of the number 360
+ */
#define CFX_360 CLUTTER_INT_TO_FIXED (360)
+/**
+ * CFX_240:
+ *
+ * Fixed point representation of the number 240
+ */
#define CFX_240 CLUTTER_INT_TO_FIXED (240)
+/**
+ * CFX_180:
+ *
+ * Fixed point representation of the number 180
+ */
#define CFX_180 CLUTTER_INT_TO_FIXED (180)
+/**
+ * CFX_120:
+ *
+ * Fixed point representation of the number 120
+ */
#define CFX_120 CLUTTER_INT_TO_FIXED (120)
+/**
+ * CFX_60:
+ *
+ * Fixed point representation of the number 60
+ */
#define CFX_60 CLUTTER_INT_TO_FIXED (60)
+/**
+ * CFX_255:
+ *
+ * Fixed point representation of the number 255
+ */
#define CFX_255 CLUTTER_INT_TO_FIXED (255)
-
+/**
+ * CLUTTER_FIXED_TO_FLOAT:
+ *
+ * Macro to convert from fixed to floating point.
+ */
#define CLUTTER_FIXED_TO_FLOAT(x) ((float)((int)(x)/65536.0))
-
+/**
+ * CLUTTER_FIXED_TO_DOUBLE:
+ *
+ * Macro to convert from fixed to doulbe precission floating point.
+ */
#define CLUTTER_FIXED_TO_DOUBLE(x) ((double)((int)(x)/65536.0))
-
+/**
+ * CLUTTER_FLOAT_TO_FIXED:
+ *
+ * Macro to convert from floating to fixed point.
+ */
#define CLUTTER_FLOAT_TO_FIXED(x) \
( (ABS(x) > 32767.0) ? \
(((x)/(x))*0x7fffffff) \
: ((long)((x) * 65536.0 + ((x) < 0 ? -0.5 : 0.5))) )
+/**
+ * CLUTTER_INT_TO_FIXED:
+ *
+ * Macro to convert from int to fixed point representation.
+ */
#define CLUTTER_INT_TO_FIXED(x) ((x) << CFX_Q)
-
+/**
+ * CLUTTER_FIXED_INT:
+ *
+ * Macro to convert from fixed point to integer.
+ */
#define CLUTTER_FIXED_INT(x) ((x) >> CFX_Q)
-
+/**
+ * CLUTTER_FIXED_FRACTION:
+ *
+ * Macro to retrive the fraction of a fixed point number.
+ */
#define CLUTTER_FIXED_FRACTION(x) ((x) & ((1 << CFX_Q) - 1))
+/**
+ * CLUTTER_FIXED_FLOOR:
+ *
+ * Macro to obtain greatest integer lesser than given fixed point value.
+ */
#define CLUTTER_FIXED_FLOOR(x) \
(((x) >= 0) ? ((x) >> CFX_Q) : ~((~(x)) >> CFX_Q))
-
+/**
+ * CLUTTER_FIXED_CEIL:
+ *
+ * Macro to obtain smallest integer greater than given fixed point value.
+ */
#define CLUTTER_FIXED_CEIL(x) CLUTTER_FIXED_FLOOR(x + 0xffff)
-
+/**
+ * CLUTTER_FIXED_MUL:
+ *
+ * Macro to multiply two fixed point numbers.
+ */
#define CLUTTER_FIXED_MUL(x,y) ((x) >> 8) * ((y) >> 8)
+/**
+ * CLUTTER_FIXED_DIV:
+ *
+ * Macro to divide two fixed point numbers.
+ */
#define CLUTTER_FIXED_DIV(x,y) ((((x) << 8)/(y)) << 8)
/* some handy short aliases to avoid exessively long lines */
+
+/**
+ * CFX_INT:
+ *
+ * Alias for CLUTTER_FIXED_INT:
+ */
#define CFX_INT CLUTTER_FIXED_INT
+/**
+ * CFX_MUL:
+ *
+ * Alias for CLUTTER_FIXED_MUL:
+ */
#define CFX_MUL CLUTTER_FIXED_MUL
+
+/**
+ * CFX_DIV:
+ *
+ * Alias for CLUTTER_FIXED_DIV:
+ */
#define CFX_DIV CLUTTER_FIXED_DIV
/* Fixed point math routines */
ClutterFixed clutter_sini (ClutterAngle angle);
/* convenience macros for the cos functions */
+
+/**
+ * clutter_cosx:
+ * @angle: a #ClutterFixed angle in radians
+ *
+ * Fixed point cosine function
+ *
+ * Return value: #ClutterFixed cosine value.
+ *
+ * Note: Implemneted as a macro.
+ *
+ * Since: 0.2
+ */
#define clutter_cosx(x) clutter_fixed_sin((x) - CFX_PI_2)
+
+/**
+ * clutter_cosi:
+ * @angle: a #ClutterAngle angle
+ *
+ * Very fast fixed point implementation of cosine function.
+ *
+ * ClutterAngle is an integer such that 1024 represents
+ * full circle.
+ *
+ * Return value: #ClutterFixed cosine value.
+ *
+ * Note: Implemneted as a macro.
+ *
+ * Since: 0.2
+ */
#define clutter_cosi(x) clutter_sini((x) - 256)
ClutterFixed clutter_sqrtx (ClutterFixed x);
AC_SUBST(CLUTTER_DEBUG_CFLAGS)
+AC_ARG_WITH(fpu, AS_HELP_STRING([--without-fpu],
+ [Assume no fpu is present]),
+ [with_fpu=$withval], [with_fpu=yes])
+
+if test "x$with_fpu" != "xyes" ; then
+ CLUTTER_FIXED_CFLAGS="-DCFX_NO_FPU"
+fi
+
dnl = GTK Doc check ========================================================
GTK_DOC_CHECK([1.4])
AC_SUBST(GCC_FLAGS)
-CLUTTER_CFLAGS="$GLX_CLAGS $CLUTTER_DEPS_CFLAGS"
+CLUTTER_CFLAGS="$GLX_CLAGS $CLUTTER_DEPS_CFLAGS $CLUTTER_FIXED_CFLAGS"
CLUTTER_LIBS="$GLX_LIBS $CLUTTER_DEPS_LIBS"
AC_SUBST(CLUTTER_CFLAGS)
echo ""
echo " Debug level: ${enable_debug}"
echo " Documentation: ${enable_gtk_doc}"
+echo " FPU: ${with_fpu}"
echo ""
<!-- ##### MACRO CFX_Q ##### -->
<para>
-
+Number of bits used to store fractional part of #ClutterFixed.
</para>
<!-- ##### MACRO CFX_ONE ##### -->
<para>
-
+#ClutterFixed representation of 1.
</para>
<!-- ##### MACRO CFX_MAX ##### -->
<para>
-
+Maximum number representable by #ClutterFixed.
</para>
<!-- ##### MACRO CFX_MIN ##### -->
<para>
-
+Minumum number representable by #ClutterFixed.
</para>
<!-- ##### MACRO CFX_PI ##### -->
<para>
-
+#ClutterFixed representation of Pi.
</para>
<!-- ##### MACRO CFX_2PI ##### -->
<para>
-
+#ClutterFixed representation of 2 * Pi.
</para>
<!-- ##### MACRO CFX_PI_2 ##### -->
<para>
-
+#ClutterFixed representation of Pi/2.
</para>
<!-- ##### MACRO CFX_PI_4 ##### -->
<para>
-
-</para>
-
-
-
-<!-- ##### MACRO CFX_PI8192 ##### -->
-<para>
-
+#ClutterFixed representation of Pi/4.
</para>
<!-- ##### MACRO CFX_120 ##### -->
<para>
-
+#ClutterFixed representation of 120.
</para>
<!-- ##### MACRO CFX_180 ##### -->
<para>
-
+#ClutterFixed representation of 180.
</para>
<!-- ##### MACRO CFX_240 ##### -->
<para>
-
+#ClutterFixed representation of 240.
</para>
<!-- ##### MACRO CFX_360 ##### -->
<para>
-
+#ClutterFixed representation of 360.
</para>
<!-- ##### MACRO CFX_60 ##### -->
<para>
-
+#ClutterFixed representation of 60.
</para>
<!-- ##### MACRO CFX_255 ##### -->
<para>
-
+#ClutterFixed representation of 255.
</para>
<!-- ##### MACRO CFX_DIV ##### -->
<para>
-
+Alias for #CLUTTER_FIXED_DIV.
</para>
<!-- ##### MACRO CFX_INT ##### -->
<para>
-
+Alias for #CLUTTER_FIXED_INT.
</para>
<!-- ##### MACRO CFX_MUL ##### -->
<para>
-
+Alias for #CLUTTER_FIXED_MUL.
</para>
<!-- ##### MACRO CLUTTER_FIXED_TO_FLOAT ##### -->
<para>
-
+Macro for converting #ClutterFixed to single precission floating point.
</para>
-@x:
+@x: #ClutterFixed
<!-- ##### MACRO CLUTTER_FIXED_TO_DOUBLE ##### -->
<para>
-
+Macro for converting #ClutterFixed to double precission floating point.
</para>
-@x:
+@x: #ClutterFixed
<!-- ##### MACRO CLUTTER_FLOAT_TO_FIXED ##### -->
<para>
-
+Macro for converting floating point numbers to #ClutterFixed.
</para>
-@x:
+@x: double or float
<!-- ##### MACRO CLUTTER_INT_TO_FIXED ##### -->
<para>
-
+Macro for converting integers to #ClutterFixed.
</para>
-@x:
+@x: int
<!-- ##### MACRO CLUTTER_FIXED_INT ##### -->
<para>
-
+Macro to obtain integer part of #ClutterFixed.
</para>
-@x:
+@x: #ClutterFixed
<!-- ##### MACRO CLUTTER_FIXED_FRACTION ##### -->
<para>
-
+Macro to obtain the fraction of #ClutterFixed.
</para>
-@x:
+@x: #ClutterFixed
<!-- ##### MACRO CLUTTER_FIXED_FLOOR ##### -->
<para>
-
+Macro to obtain greatest integer smaller than given #ClutterFixed.
</para>
-@x:
+@x: #ClutterFixed
<!-- ##### MACRO CLUTTER_FIXED_CEIL ##### -->
<para>
-
+Macro to obtain smallest integer greater than given #ClutterFixed.
</para>
-@x:
+@x: #ClutterFixed
<!-- ##### MACRO CLUTTER_FIXED_MUL ##### -->
<para>
-
+Macro for multiplication of two #ClutterFixed numbers.
</para>
-@x:
-@y:
+@x: #ClutterFixed
+@y: #ClutterFixed
<!-- ##### MACRO CLUTTER_FIXED_DIV ##### -->
<para>
-
+Macro for difvision of two #ClutterFixed numbers.
</para>
-@x:
-@y:
+@x: #ClutterFixed
+@y: #ClutterFixed
<!-- ##### MACRO clutter_cosi ##### -->
<para>
-
+Very fast fixed point cosine function.
</para>
-@x:
+@x: #ClutterAngle
<!-- ##### MACRO clutter_cosx ##### -->
<para>
-
+Fast fixed point cosine function.
</para>
-@x:
+@x: #ClutterFixed
<!-- ##### FUNCTION clutter_sini ##### -->
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