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small refinement (30 bytes less, slightly higher precision)

This commit is contained in:
Christian Kroll 2012-09-18 23:48:41 +00:00
parent 5a7834bf8f
commit 3e7ee74414
1 changed files with 14 additions and 13 deletions
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27
animations/fpmath_patterns.c
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@ -88,13 +88,14 @@
* values. These values are intended for Q5 types.
*/
static lut_t const fix_sine_lut[FIX_SIN_COUNT / 4] =
{ 0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 15,
15, 16, 17, 18, 19, 20, 20, 21,
22, 22, 23, 24, 24, 25, 26, 26,
27, 27, 28, 28, 29, 29, 29, 30,
30, 30, 31, 31, 31, 31, 31, 31,
31, 31};
{ 0, 1, 2, 3, 4, 5, 6, 7,
8, 9, 10, 11, 12, 13, 14, 14,
15, 16, 17, 18, 19, 20, 20, 21,
22, 23, 23, 24, 25, 25, 26, 26,
27, 27, 28, 28, 29, 29, 30, 30,
30, 31, 31, 31, 31, 32, 32, 32,
32, 32};
#else
/** This is the type we expect ordinary integers to be. */
typedef int16_t ordinary_int_t;
@ -469,8 +470,8 @@ static unsigned char fixAnimPlasma(unsigned char const x,
fixp_t const fFunc2 = fixSin(fixMul(fixDist(fixScaleUp(x), fixScaleUp(y),
p->fFunc2SinArg, p->fFunc2CosArg), fPlasmaX));
uint8_t const nRes = fixScaleDown(fixDiv(fixMul(p->fFunc1[x] + fFunc2 +
fixScaleUp(2), fixScaleUp(NUMPLANE - 1)), fixScaleUp(2)));
unsigned char const nRes = (unsigned char)(fixMul(p->fFunc1[x] + fFunc2 +
fixScaleUp(2), ((NUMPLANE + 1) / 4.0 - 0.05) * FIX)) / FIX;
assert (nRes <= NUMPLANE);
return nRes;
@ -534,10 +535,10 @@ static unsigned char fixAnimPsychedelic(unsigned char const x,
p->ft10 = fixMul(t, fixScaleUp(10));
}
uint8_t const nResult =
fixScaleDown(fixMul(fixSin((fixp_interim_t)fixDist(fixScaleUp(x),
fixScaleUp(y), p->fCos, p->fSin) - p->ft10) + fixScaleUp(1),
fixScaleUp(NUMPLANE - 1)));
unsigned char const nResult =
(unsigned char)(fixMul(fixSin(fixDist(fixScaleUp(x), fixScaleUp(y),
p->fCos, p->fSin) - p->ft10) + fixScaleUp(1),
(fixp_t)((NUMPLANE - 1.05) * FIX))) / FIX;
assert(nResult <= NUMPLANE);
return nResult;