Fix barycentric coordinates calculation (#2)

Reviewed-on: #2

	* Set up for debugging
	* Replace get_barycentric_coords with different calculation
	* Update commented lines
	* Add V3_ELEM_COUNT macro
	* Change loop in barycentric coordinates calculation function
	* Update debug values
	* Simplify barycentric coordinates function
	* Remove debug lines
Co-authored-by: Abdelrahman <said.abdelrahman89@gmail.com>
Co-committed-by: Abdelrahman <said.abdelrahman89@gmail.com>

src/vec/vec.h

@@ -5,6 +5,8 @@
 #include "typed_list.h"
 #include <math.h>
 
+#define V3_ELEM_COUNT 3
+
 typedef struct i64x2 V2i;
 struct i64x2 {
   i64 x;
@@ -32,16 +34,21 @@ struct f32x2 {
 typedef struct f32x3 V3f;
 struct f32x3 {
   union {
-    f32 x;
-    f32 r;
-  };
-  union {
-    f32 y;
-    f32 g;
-  };
-  union {
-    f32 z;
-    f32 b;
+    f32 elements[V3_ELEM_COUNT];
+    struct {
+      union {
+        f32 x;
+        f32 r;
+      };
+      union {
+        f32 y;
+        f32 g;
+      };
+      union {
+        f32 z;
+        f32 b;
+      };
+    };
   };
 };