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| author | Joel Bodenmann <joel@unormal.org> | 2013-11-10 21:07:16 +0100 |
|---|---|---|
| committer | Joel Bodenmann <joel@unormal.org> | 2013-11-10 21:07:16 +0100 |
| commit | da2740b706d720292113445ee1db30f8a9873dc4 (patch) | |
| tree | 8f8b1902d4af6a23b3daf26990f580b76ea31ea4 /include/gmisc/options.h | |
| parent | 6ca3537a696e7ace8098771a9a7105380604253d (diff) | |
| parent | a8ce005e2621b0108863297948cea0fa52c8bf2a (diff) | |
| download | uGFX-da2740b706d720292113445ee1db30f8a9873dc4.tar.gz uGFX-da2740b706d720292113445ee1db30f8a9873dc4.tar.bz2 uGFX-da2740b706d720292113445ee1db30f8a9873dc4.zip | |
merging GDISPStreaming
Diffstat (limited to 'include/gmisc/options.h')
| -rw-r--r-- | include/gmisc/options.h | 39 |
1 files changed, 32 insertions, 7 deletions
diff --git a/include/gmisc/options.h b/include/gmisc/options.h index d5cf5898..06f689ec 100644 --- a/include/gmisc/options.h +++ b/include/gmisc/options.h @@ -28,25 +28,50 @@ #define GMISC_NEED_ARRAYOPS FALSE
#endif
/**
- * @brief Include fast array based trig functions (sin, cos)
+ * @brief Include fast fixed point trig functions (sin, cos)
* @details Defaults to FALSE
*/
- #ifndef GMISC_NEED_FASTTRIG
- #define GMISC_NEED_FASTTRIG FALSE
+ #ifndef GMISC_NEED_FIXEDTRIG
+ #define GMISC_NEED_FIXEDTRIG FALSE
#endif
/**
- * @brief Include fast fixed point trig functions (sin, cos)
+ * @brief Include fast inverse square root (x^-1/2)
* @details Defaults to FALSE
*/
- #ifndef GMISC_NEED_FIXEDTRIG
- #define GMISC_NEED_FIXEDTRIG FALSE
+ #ifndef GMISC_NEED_INVSQRT
+ #define GMISC_NEED_INVSQRT FALSE
#endif
/**
* @}
*
- * @name GMISC Optional Sizing Parameters
+ * @name GMISC Optional Parameters
* @{
*/
+ /**
+ * @brief Modifies the @p invsqrt() function to assume a different integer to floating point endianness.
+ * @note Normally the floating point format and the integer format have
+ * the same endianness. Unfortunately there are some strange
+ * processors that don't eg. some very early ARM devices.
+ * For those where the endianness doesn't match you can fix it by
+ * defining GMISC_INVSQRT_MIXED_ENDIAN.
+ * @note This still assumes the processor is using an ieee floating point format.
+ *
+ * If you have a software floating point that uses a non-standard
+ * floating point format (or very strange hardware) then define
+ * GMISC_INVSQRT_REAL_SLOW and it will do it the hard way.
+ */
+ #ifndef GMISC_INVSQRT_MIXED_ENDIAN
+ #define GMISC_INVSQRT_MIXED_ENDIAN FALSE
+ #endif
+ /**
+ * @brief Modifies the @p invsqrt() function to do things the long slow way.
+ * @note This causes the @p invsqrt() function to work regardless of the
+ * processor floating point format.
+ * @note This makes the @p invsqrt() function very slow.
+ */
+ #ifndef GMISC_INVSQRT_REAL_SLOW
+ #define GMISC_INVSQRT_REAL_SLOW FALSE
+ #endif
/** @} */
#endif /* _GMISC_OPTIONS_H */
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