add overloaded vec_new (with macro tricks)

sweet_math_short.c

@@ -0,0 +1,81 @@
+#include "sweet_math.h"
+
+vec2 vec2_new_2f(float x, float y)
+{
+    vec2 v;
+    v.x = x;
+    v.y = y;
+    return v;
+}
+
+vec2 vec2_new_v3(vec3 w)
+{
+    vec2 v;
+    v.x = w.x;
+    v.y = w.y;
+    return v;
+}
+
+vec3 vec3_new_3f(float x, float y, float z)
+{
+    vec3 v;
+    v.x = x;
+    v.y = y;
+    v.z = z;
+    return v;
+}
+
+vec3 vec3_new_v2_1f(vec2 w, float z)
+{
+    vec3 v;
+    v.x = w.x;
+    v.y = w.y;
+    v.z = z;
+    return v;
+}
+
+vec3 vec3_new_v4(vec4 w)
+{
+    vec3 v;
+    v.x = w.x;
+    v.y = w.y;
+    v.z = w.z;
+    return v;
+}
+
+vec4 vec4_new_4f(float x, float y, float z, float w)
+{
+    vec4 v;
+    v.x = x;
+    v.y = y;
+    v.z = z;
+    v.w = w;
+    return v;
+}
+
+vec4 vec4_new_v2_2f(vec2 u, float z, float w)
+{
+    vec4 v;
+    v.x = u.x;
+    v.y = u.y;
+    v.z = z;
+    v.w = w;
+    return v;
+}
+
+vec4 vec4_new_v3_1f(vec3 u, float w)
+{
+    vec4 v;
+    v.x = u.x;
+    v.y = u.y;
+    v.z = u.z;
+    v.w = w;
+    return v;
+}
+
+vec4 vec4_new_v4 (vec4 v)
+{
+    return v;
+}
+
+

sweet_math_short.h

@@ -21,6 +21,24 @@
 
 #include "sweet_math.h"
 
+#define VEC2_BUILDER(_1, _2, NAME, ...) NAME
+#define VEC3_BUILDER(_1, _2, _3, NAME, ...) NAME
+#define VEC4_BUILDER(_1, _2, _3, _4, NAME, ...) NAME
+
+#define vec2_new(...) VEC2_BUILDER(__VA_ARGS__, vec2_new_2f, vec2_new_v3)(__VA_ARGS__)
+#define vec3_new(...) VEC3_BUILDER(__VA_ARGS__, vec3_new_3f, vec3_new_v2_1f, vec3_new_v4)(__VA_ARGS__)
+#define vec4_new(...) VEC4_BUILDER(__VA_ARGS__, vec4_new_4f, vec4_new_v2_2f, vec4_new_v3_1f, vec4_new_v4)(__VA_ARGS__)
+
+vec2 vec2_new_2f(float x, float y);
+vec2 vec2_new_v3(vec3 w);
+vec3 vec3_new_3f(float x, float y, float z);
+vec3 vec3_new_v2_1f(vec2 w, float z);
+vec3 vec3_new_v4(vec4 w);
+vec4 vec4_new_4f(float x, float y, float z, float w);
+vec4 vec4_new_v2_2f(vec2 u, float z, float w);
+vec4 vec4_new_v3_1f(vec3 u, float w);
+vec4 vec4_new_v4 (vec4 v);
+
 #define radian_2_degree(radian) radian * 57.2957795130823208767981548
 #define degree_2_radian(degree) degree * 0.01745329251994329576923690768488