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authorKenneth Graunke <kenneth@whitecape.org>2013-07-07 18:44:12 -0700
committerKenneth Graunke <kenneth@whitecape.org>2013-10-13 00:10:44 -0700
commit67601da24c98a13a1a349b4e3df38ad10ff812bb (patch)
tree4ec599ed0a19cd43ce4e954960f9de946dbdafb2 /src/mesa/main
parent1a82081db6e57eaa74f852ed8acb391a7f4c2ca6 (diff)
mesa: Move U_FIXED/S_FIXED macros from i965 to macros.h.
These make it easy to convert a floating point value to a fixed point numbers. The second parameter is the number of bits used for the fractional part of the number. It looks like core Mesa has similar functions already, but none that allows an arbitrary number of fractional bits. The more generic version is probably useful to everyone. r600g apparently has an identical copy of the S_FIXED macro, but doesn't include this file. I'm not sure what to do about that, so I'm just going to leave it for now. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Diffstat (limited to 'src/mesa/main')
-rw-r--r--src/mesa/main/macros.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/src/mesa/main/macros.h b/src/mesa/main/macros.h
index 4bb17d8d174..880c6564e18 100644
--- a/src/mesa/main/macros.h
+++ b/src/mesa/main/macros.h
@@ -184,6 +184,28 @@ static inline GLfloat UINT_AS_FLT(GLuint u)
return tmp.f;
}
+/**
+ * Convert a floating point value to an unsigned fixed point value.
+ *
+ * \param frac_bits The number of bits used to store the fractional part.
+ */
+static INLINE uint32_t
+U_FIXED(float value, uint32_t frac_bits)
+{
+ value *= (1 << frac_bits);
+ return value < 0 ? 0 : value;
+}
+
+/**
+ * Convert a floating point value to an signed fixed point value.
+ *
+ * \param frac_bits The number of bits used to store the fractional part.
+ */
+static INLINE uint32_t
+S_FIXED(float value, uint32_t frac_bits)
+{
+ return value * (1 << frac_bits);
+}
/*@}*/