Some refactoring.

types.h

@@ -0,0 +1,77 @@
+#ifndef TYPES_H_SENTRY
+#define TYPES_H_SENTRY
+
+#include <stdlib.h>
+
+
+#ifndef TRUE
+#define TRUE 1
+#endif
+
+#ifndef FALSE
+#define FALSE 0
+#endif
+
+typedef struct {
+    float x;
+    float y;
+} vector2;
+
+typedef struct {
+    float r;
+    float g;
+    float b;
+} vector3;
+
+typedef struct {
+    float r;
+    float g;
+    float b;
+    float a;
+} vector4;
+
+typedef struct {
+    float w;
+    float h;
+} rect;
+
+typedef struct {
+    vector2 point;
+    vector2 velocity;
+    vector2 dimension;
+    vector4 color;
+} particle;
+
+struct node {
+    struct node *next;
+    particle data;
+};
+
+typedef struct {
+    struct node *first;
+    struct node *last;
+} queue;
+
+typedef struct {
+    int is_running;
+    int last_frame_time;
+
+    struct ball {
+        vector2 point;
+        vector2 velocity;
+        vector2 dimension;
+    } ball;
+
+    struct player {
+        vector2 point;
+        vector2 dimension;
+        float vy;
+        int score;
+        int up;
+        int down;
+    } player_one, player_two;
+
+    queue particles;
+} game_state;
+
+#endif