Add (unsigned, signed) integer vectors

Those vectors are needed for storing a position  that is only on fixed
points on a grid. The  position and size of a window must be expressed
as integer vectors, for example.

modules/utility/inc-c/voxula/internals/utility.h

@@ -2,6 +2,7 @@
 #ifndef VOXULA_UTILITY_H
 #define VOXULA_UTILITY_H
 
+#include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 
@@ -14,6 +15,15 @@ typedef uint64_t vx_uuid_d;
 typedef struct vx_vec2f vx_vec2f_s;
 typedef struct vx_vec3f vx_vec3f_s;
 typedef struct vx_vec4f vx_vec4f_s;
+
+typedef struct vx_vec2u vx_vec2u_s;
+typedef struct vx_vec3u vx_vec3u_s;
+typedef struct vx_vec4u vx_vec4u_s;
+
+typedef struct vx_vec2i vx_vec2i_s;
+typedef struct vx_vec3i vx_vec3i_s;
+typedef struct vx_vec4i vx_vec4i_s;
+
 typedef struct vx_mat2f vx_mat2f_s;
 typedef struct vx_mat3f vx_mat3f_s;
 typedef struct vx_mat4f vx_mat4f_s;
@@ -106,6 +116,48 @@ struct vx_vec4f
     float w;
 };
 
+struct vx_vec2u
+{
+    uint64_t x;
+    uint64_t y;
+};
+
+struct vx_vec3u
+{
+    uint64_t x;
+    uint64_t y;
+    uint64_t z;
+};
+
+struct vx_vec4u
+{
+    uint64_t x;
+    uint64_t y;
+    uint64_t z;
+    uint64_t w;
+};
+
+struct vx_vec2i
+{
+    int64_t x;
+    int64_t y;
+};
+
+struct vx_vec3i
+{
+    int64_t x;
+    int64_t y;
+    int64_t z;
+};
+
+struct vx_vec4i
+{
+    int64_t x;
+    int64_t y;
+    int64_t z;
+    int64_t w;
+};
+
 struct vx_mat2f
 {
     float val[4];