separation to vec.h, generic vector ops, camera class and its usage for spatial rendering

src/util.h

@@ -1,6 +1,7 @@
 #ifndef UTIL_H
 #define UTIL_H
 
+#include "vec.h"
 
 #include <SDL2/SDL.h>
 #include <physfs.h>
@@ -78,40 +79,13 @@ _Alignas(4)
 } t_color;
 
 
-/* a point in some space (integer) */
-typedef struct vec2 {
-    int x, y;
-} t_vec2;
-
-
-/* a point in some space (floating point) */
-typedef struct fvec2 {
-_Alignas(8)
-    float x;
-    float y;
-} t_fvec2;
-
-
-/* a point in some three dimension space (floating point) */
-/* y goes up, x goes to the right */
-typedef struct fvec3 {
-_Alignas(8)
-    float x;
-    float y;
-    float z;
-} t_fvec3;
-
-
-/* a point in some space (short) */
-typedef struct shvec2 {
-    short x, y;
-} t_shvec2;
-
-
 /* a rectangle with the origin at the upper left (integer) */
 typedef struct rect {
-    int x, y;
-    int w, h;
+_Alignas(16)
+    int32_t x;
+    int32_t y;
+    int32_t w;
+    int32_t h;
 } t_rect;
 
 
@@ -135,15 +109,9 @@ t_frect to_frect(t_rect rect);
 t_fvec2 frect_center(t_frect rect);
 
 
-/* aren't macros to prevent double evaluation with side effects */
-/* maybe could be inlined? i hope LTO will resolve this */
-t_fvec2 fvec2_from_vec2(t_vec2 vec);
-t_fvec2 fvec2_from_shvec2(t_shvec2 vec);
-
-#define m_to_fvec2(p_any_vec2) (_Generic((p_any_vec2),          \
-                                    t_vec2:   fvec2_from_vec2,  \
-                                    t_shvec2: fvec2_from_shvec2 \
-                                )(p_any_vec2))
+typedef struct matrix4 {
+    t_fvec4 row[4];
+} t_matrix4;
 
 
 /* decrements an lvalue (which should be an int), stopping at 0 */