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fastMath cleanup

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This commit is contained in:
Tectu 2012-07-22 22:28:28 +02:00
parent 2e6d8615cf
commit af3c8f87b7
2 changed files with 15 additions and 19 deletions
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27
glcd/fastMath.c
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@ -116,30 +116,26 @@ float sintable[91] = {
}; };
float getSin(unsigned int degree) float getSin(unsigned int degree) {
{
degree = degree % 360; degree = degree % 360;
if(degree <= 90)
{ if(degree <= 90) {
return sintable[degree]; return sintable[degree];
} }
else if(degree <= 180) else if(degree <= 180) {
{
return sintable[180-degree]; return sintable[180-degree];
} }
else if(degree <= 270) else if(degree <= 270) {
{
return sintable[degree-180]*(-1.0); return sintable[degree-180]*(-1.0);
} }
else else {
{
return sintable[360-degree]*(-1.0); return sintable[360-degree]*(-1.0);
} }
} }
double getCos(unsigned int degree) double getCos(unsigned int degree) {
{
degree = degree % 360; degree = degree % 360;
return getSin(degree+90); return getSin(degree+90);
} }
@ -148,12 +144,11 @@ char sgn(char x){
return (x > 0) ? 1 : (x < 0) ? -1 : 0; return (x > 0) ? 1 : (x < 0) ? -1 : 0;
} }
unsigned char max(unsigned char a, unsigned char b) unsigned char max(unsigned char a, unsigned char b) {
{
return (a<b) ? b : a; return (a<b) ? b : a;
} }
unsigned char min (unsigned char a, unsigned char b) unsigned char min (unsigned char a, unsigned char b) {
{
return (a<b) ? a : b; return (a<b) ? a : b;
} }

5
glcd/fastMath.h
View file

@ -19,12 +19,13 @@
* Copyright: 2011 Roland Domke * Copyright: 2011 Roland Domke
*/ */
#ifndef FASTMATH_H_ #ifndef FASTMATH_H
#define FASTMATH_H_ #define FASTMATH_H
char sgn(char x); char sgn(char x);
double getCos(unsigned int degree); double getCos(unsigned int degree);
double getSin(unsigned int degree); double getSin(unsigned int degree);
unsigned char max(unsigned char a, unsigned char b); unsigned char max(unsigned char a, unsigned char b);
unsigned char min(unsigned char a, unsigned char b); unsigned char min(unsigned char a, unsigned char b);
#endif /* FASTMATH_H_ */ #endif /* FASTMATH_H_ */