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Merge branch 'fixedrounding-hotfix' into 'next'

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FixedRounding hotfix

Fix the FixedFloor, FixedTrunc, FixedCeil, and FixedRound functions.

See merge request !142
This commit is contained in:
Monster Iestyn 2017-01-02 13:05:30 -05:00
commit 6d07c6baab
1 changed files with 22 additions and 6 deletions
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28
src/m_fixed.h
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@ -283,9 +283,16 @@ FUNCMATH FUNCINLINE static ATTRINLINE fixed_t FixedFloor(fixed_t x)
{
const fixed_t a = abs(x); //absolute of x
const fixed_t i = (a>>FRACBITS)<<FRACBITS; // cut out the fractional part
const fixed_t f = i-a; // cut out the integral part
const fixed_t f = a-i; // cut out the integral part
if (f == 0)
return x;
if (x != INT32_MIN)
return x-f; // return largest integral value not greater than argument
{ // return rounded down to nearest whole number
if (x > 0)
return x-f;
else
return x-(FRACUNIT-f);
}
return INT32_MIN;
}
@ -301,7 +308,7 @@ FUNCMATH FUNCINLINE static ATTRINLINE fixed_t FixedTrunc(fixed_t x)
{
const fixed_t a = abs(x); //absolute of x
const fixed_t i = (a>>FRACBITS)<<FRACBITS; // cut out the fractional part
const fixed_t f = i-a; // cut out the integral part
const fixed_t f = a-i; // cut out the integral part
if (x != INT32_MIN)
{ // return rounded to nearest whole number, towards zero
if (x > 0)
@ -324,11 +331,18 @@ FUNCMATH FUNCINLINE static ATTRINLINE fixed_t FixedCeil(fixed_t x)
{
const fixed_t a = abs(x); //absolute of x
const fixed_t i = (a>>FRACBITS)<<FRACBITS; // cut out the fractional part
const fixed_t f = i-a; // cut out the integral part
const fixed_t f = a-i; // cut out the integral part
if (f == 0)
return x;
if (x == INT32_MIN)
return INT32_MIN;
else if (x < FixedFloor(INT32_MAX))
return x+(FRACUNIT-f); // return smallest integral value not less than argument
{ // return rounded up to nearest whole number
if (x > 0)
return x+(FRACUNIT-f);
else
return x+f;
}
return INT32_MAX;
}
@ -344,7 +358,9 @@ FUNCMATH FUNCINLINE static ATTRINLINE fixed_t FixedRound(fixed_t x)
{
const fixed_t a = abs(x); //absolute of x
const fixed_t i = (a>>FRACBITS)<<FRACBITS; // cut out the fractional part
const fixed_t f = i-a; // cut out the integral part
const fixed_t f = a-i; // cut out the integral part
if (f == 0)
return x;
if (x == INT32_MIN)
return INT32_MIN;
else if (x < FixedFloor(INT32_MAX))