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cloth: Avoid calling powf with integer exponent

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This is pretty slow and even shows up in profiling.
This commit is contained in:
Sergej Reich
2014-11-11 18:08:15 +01:00
parent 9c15439c5c
commit 490b73ff22
1 changed files with 7 additions and 3 deletions
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10
source/blender/blenkernel/intern/implicit.c
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@@ -686,14 +686,18 @@ int implicit_free(ClothModifierData *clmd)
DO_INLINE float fb(float length, float L)
{
float x = length / L;
return (-11.541f * powf(x, 4) + 34.193f * powf(x, 3) - 39.083f * powf(x, 2) + 23.116f * x - 9.713f);
float xx = x * x;
float xxx = xx * x;
float xxxx = xxx * x;
return (-11.541f * xxxx + 34.193f * xxx - 39.083f * xx + 23.116f * x - 9.713f);
}
DO_INLINE float fbderiv(float length, float L)
{
float x = length/L;
return (-46.164f * powf(x, 3) + 102.579f * powf(x, 2) - 78.166f * x + 23.116f);
float xx = x * x;
float xxx = xx * x;
return (-46.164f * xxx + 102.579f * xx - 78.166f * x + 23.116f);
}
DO_INLINE float fbstar(float length, float L, float kb, float cb)