move from float3 to float2, and general cleanup

src/util/vec/float2.h

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <math.h>
+
+#include "../atrb.h"
+
+// stores a 3D point using a floating-point number
+struct float2 {
+	float x;
+	float y;
+};
+typedef struct float2 float2;
+
+// adds one float2 to another
+atrb_const static inline float2 float2_add(float2 v1, float2 v2) {
+	return (float2){v1.x + v2.x, v1.y + v2.y};
+}
+
+// subtracts one float2 from another
+atrb_const static inline float2 float2_sub(float2 v1, float2 v2) {
+	return (float2){v1.x - v2.x, v1.y - v2.y};
+}
+
+// multiplies one float2 by another
+atrb_const static inline float2 float2_mul(float2 v1, float2 v2) {
+	return (float2){v1.x * v2.x, v1.y * v2.y};
+}
+
+// divides one float2 by another
+atrb_const static inline float2 float2_div(float2 v1, float2 v2) {
+	return (float2){v1.x / v2.x, v1.y / v2.y};
+}
+
+// preforms a scalar multiplication upon the float2 (multiplies the float2 by some value)
+atrb_const static inline float2 float2_mul_s(float2 v, float n) {
+	return (float2){v.x * n, v.y * n};
+}
+
+// preforms a scalar division upon the float2 (divides the float2 by some value)
+atrb_const static inline float2 float2_div_s(float2 v, float n) {
+	return (float2){v.x / n, v.y / n};
+}
+
+atrb_const static inline float2 float2_neg(float2 v) {
+	return (float2){-v.x, -v.y };
+}
+
+// gets the squared magnitude/length of float2
+atrb_const static inline float float2_mag2(float2 v) {
+	return (v.x * v.x) + (v.y * v.y);
+}
+
+// gets the length of float2 (length)
+atrb_const static inline float float2_mag(float2 v) {
+	return sqrtf(float2_mag2(v));
+}
+
+// normalizes the float2
+atrb_const static inline float2 float2_norm(float2 v) {
+	float s = 1.0F / float2_mag(v); // get the scaling factor
+	return float2_mul_s(v, s);      // scale the vector by the scaling factor (slightly more efficient than dividing)
+}
+
+// gets the dot product of two float2s
+atrb_const static inline float float2_dot(float2 v1, float2 v2) {
+	return v1.x * v2.x + v1.y * v2.y;
+}