Diff: math_ops.cpp

Revision:

0:76c761d3caf1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/math_ops.cpp	Sat Mar 20 18:38:51 2021 +0000
@@ -0,0 +1,48 @@
+
+#include "math_ops.h"
+
+
+float fmaxf(float x, float y){
+    /// Returns maximum of x, y ///
+    return (((x)>(y))?(x):(y));
+    }
+
+float fminf(float x, float y){
+    /// Returns minimum of x, y ///
+    return (((x)<(y))?(x):(y));
+    }
+
+float fmaxf3(float x, float y, float z){
+    /// Returns maximum of x, y, z ///
+    return (x > y ? (x > z ? x : z) : (y > z ? y : z));
+    }
+
+float fminf3(float x, float y, float z){
+    /// Returns minimum of x, y, z ///
+    return (x < y ? (x < z ? x : z) : (y < z ? y : z));
+    }
+    
+void limit_norm(float *x, float *y, float limit){
+    /// Scales the lenght of vector (x, y) to be <= limit ///
+    float norm = sqrt(*x * *x + *y * *y);
+    if(norm > limit){
+        *x = *x * limit/norm;
+        *y = *y * limit/norm;
+        }
+    }
+
+
+int float_to_uint(float x, float x_min, float x_max, int bits){
+    /// Converts a float to an unsigned int, given range and number of bits ///
+    float span = x_max - x_min;
+    float offset = x_min;
+    return (int) ((x-offset)*((float)((1<<bits)-1))/span);
+    }
+    
+    
+float uint_to_float(int x_int, float x_min, float x_max, int bits){
+    /// converts unsigned int to float, given range and number of bits ///
+    float span = x_max - x_min;
+    float offset = x_min;
+    return ((float)x_int)*span/((float)((1<<bits)-1)) + offset;
+    }