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mesa: Move U_FIXED/S_FIXED macros from i965 to macros.h.

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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>
This commit is contained in:
Kenneth Graunke 2013-07-07 18:44:12 -07:00
parent 1a82081db6
commit 67601da24c
3 changed files with 22 additions and 39 deletions
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13
src/mesa/drivers/dri/i915/intel_context.h
View file

@ -293,19 +293,6 @@ extern char *__progname;
#define SUBPIXEL_X 0.125
#define SUBPIXEL_Y 0.125
static INLINE uint32_t
U_FIXED(float value, uint32_t frac_bits)
{
value *= (1 << frac_bits);
return value < 0 ? 0 : value;
}
static INLINE uint32_t
S_FIXED(float value, uint32_t frac_bits)
{
return value * (1 << frac_bits);
}
#define INTEL_FIREVERTICES(intel) \
do { \
if ((intel)->prim.flush) \

26
src/mesa/drivers/dri/i965/intel_context.h
View file

@ -106,32 +106,6 @@ struct intel_batchbuffer {
} saved;
};
/**
* Align a value down to an alignment value
*
* If \c value is not already aligned to the requested alignment value, it
* will be rounded down.
*
* \param value Value to be rounded
* \param alignment Alignment value to be used. This must be a power of two.
*
* \sa ALIGN()
*/
#define ROUND_DOWN_TO(value, alignment) ((value) & ~(alignment - 1))
static INLINE uint32_t
U_FIXED(float value, uint32_t frac_bits)
{
value *= (1 << frac_bits);
return value < 0 ? 0 : value;
}
static INLINE uint32_t
S_FIXED(float value, uint32_t frac_bits)
{
return value * (1 << frac_bits);
}
/* ================================================================
* From linux kernel i386 header files, copes with odd sizes better
* than COPY_DWORDS would:

22
src/mesa/main/macros.h
View file

@ -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);
}
/*@}*/