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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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29
glcd/fastMath.c
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@ -116,44 +116,39 @@ float sintable[91] = {
};
float getSin(unsigned int degree)
{
float getSin(unsigned int degree) {
degree = degree % 360;
if(degree <= 90)
{
if(degree <= 90) {
return sintable[degree];
}
else if(degree <= 180)
{
else if(degree <= 180) {
return sintable[180-degree];
}
else if(degree <= 270)
{
else if(degree <= 270) {
return sintable[degree-180]*(-1.0);
}
else
{
else {
return sintable[360-degree]*(-1.0);
}
}
double getCos(unsigned int degree)
{
double getCos(unsigned int degree) {
degree = degree % 360;
return getSin(degree+90);
}
/* signum function */
char sgn(char x){
char sgn(char x) {
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;
}
unsigned char min (unsigned char a, unsigned char b)
{
unsigned char min (unsigned char a, unsigned char b) {
return (a<b) ? a : b;
}

5
glcd/fastMath.h
View file

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