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Adjust hlper functions

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This commit is contained in:
Miloslav Číž 2019-05-12 16:02:07 +02:00
parent 8aa3bbe29e
commit 4324cd1c76
1 changed files with 33 additions and 32 deletions
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65
s3l.h
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@ -378,17 +378,17 @@ void S3L_vec4Xmat4(S3L_Vec4 *v, S3L_Mat4 *m)
// general helper functions
static inline int16_t S3L_abs(int16_t value)
static inline S3L_Unit S3L_abs(S3L_Unit value)
{
return value >= 0 ? value : -1 * value;
}
static inline int16_t S3L_min(int16_t v1, int16_t v2)
static inline S3L_Unit S3L_min(S3L_Unit v1, S3L_Unit v2)
{
return v1 >= v2 ? v2 : v1;
}
static inline int16_t S3L_max(int16_t v1, int16_t v2)
static inline S3L_Unit S3L_max(S3L_Unit v1, S3L_Unit v2)
{
return v1 >= v2 ? v1 : v2;
}
@ -403,6 +403,36 @@ static inline S3L_Unit S3L_nonZero(S3L_Unit value)
return value != 0 ? value : 1;
}
/**
Interpolated between two values, v1 and v2, in the same ratio as t is to
tMax. Does NOT prevent zero division.
*/
static inline S3L_Unit S3L_interpolate(S3L_Unit v1, S3L_Unit v2, S3L_Unit t,
S3L_Unit tMax)
{
return v1 + ((v2 - v1) * t) / tMax;
}
/**
Like S3L_interpolate, but uses a parameter that goes from 0 to
S3L_FRACTIONS_PER_UNIT - 1, which can be faster.
*/
static inline S3L_Unit S3L_interpolateByUnit(S3L_Unit v1, S3L_Unit v2,
S3L_Unit t)
{
return v1 + ((v2 - v1) * t) / S3L_FRACTIONS_PER_UNIT;
}
// TODO: change parameters in interpolation functions to S3L_Unit
/**
Same as S3L_interpolate but with v1 = 0. Should be faster.
*/
static inline S3L_Unit S3L_interpolateByUnitFrom0(S3L_Unit v2, S3L_Unit t)
{
return (v2 * t) / S3L_FRACTIONS_PER_UNIT;
}
/**
Multiplies two matrices with normalization by S3L_FRACTIONS_PER_UNIT. Result
is stored in the first matrix.
@ -607,35 +637,6 @@ void S3L_initDrawConfig(S3L_DrawConfig *config)
void S3L_PIXEL_FUNCTION(S3L_PixelInfo *pixel); // forward decl
/**
Interpolated between two values, v1 and v2, in the same ratio as t is to
tMax. Does NOT prevent zero division.
*/
static inline int16_t S3L_interpolate(int16_t v1, int16_t v2, int16_t t,
int16_t tMax)
{
return v1 + ((v2 - v1) * t) / tMax;
}
/**
Like S3L_interpolate, but uses a parameter that goes from 0 to
S3L_FRACTIONS_PER_UNIT - 1, which can be faster.
*/
static inline int16_t S3L_interpolateByUnit(int16_t v1, int16_t v2, int16_t t)
{
return v1 + ((v2 - v1) * t) / S3L_FRACTIONS_PER_UNIT;
}
// TODO: change parameters in interpolation functions to S3L_Unit
/**
Same as S3L_interpolate but with v1 = 0. Should be faster.
*/
static inline int16_t S3L_interpolateByUnitFrom0(int16_t v2, int16_t t)
{
return (v2 * t) / S3L_FRACTIONS_PER_UNIT;
}
typedef struct
{
int16_t steps;