Some refactoring.

pingpong.c

@@ -1,114 +1,13 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <time.h>
+
 #include <SDL2/SDL.h>
 #include <SDL_ttf.h>
 
-#define TRUE 1
-#define FALSE 0
-
-#define WINDOW_WIDTH 800
-#define WINDOW_HEIGHT 600
-
-#define FPS 120
-#define TARGET_FRAME_TIME (1000 / FPS)
-
-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;
-
-void qinit(queue *item)
-{
-    item->first = NULL;
-    item->last = NULL;
-}
-
-void qput(queue *item, particle data)
-{
-    if(!item->first) {
-        item->first = malloc(sizeof(struct node));
-        item->last = item->first;
-    } else {
-        item->last->next = malloc(sizeof(struct node));
-        item->last = item->last->next;
-    }
-    item->last->data = data;
-    item->last->next = NULL;
-}
-
-void qget(queue *item, particle *data)
-{
-    if(data)
-        *data = item->first->data;
-
-    struct node *tmp = item->first;
-    item->first = item->first->next;
-    if(!item->first)
-        item->last = NULL;
-    free(tmp);
-}
-
-int qempty(queue *item)
-{
-    return !item->first;
-}
-
-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;
+#include "types.h"
+#include "settings.h"
+#include "queue.h"
 
 void exit_error(const char *error)
 {

queue.c

@@ -0,0 +1,37 @@
+#include "queue.h"
+
+void qinit(queue *item)
+{
+    item->first = NULL;
+    item->last = NULL;
+}
+
+void qput(queue *item, particle data)
+{
+    if(!item->first) {
+        item->first = malloc(sizeof(struct node));
+        item->last = item->first;
+    } else {
+        item->last->next = malloc(sizeof(struct node));
+        item->last = item->last->next;
+    }
+    item->last->data = data;
+    item->last->next = NULL;
+}
+
+void qget(queue *item, particle *data)
+{
+    if(data)
+        *data = item->first->data;
+
+    struct node *tmp = item->first;
+    item->first = item->first->next;
+    if(!item->first)
+        item->last = NULL;
+    free(tmp);
+}
+
+int qempty(queue *item)
+{
+    return !item->first;
+}

queue.h

@@ -0,0 +1,14 @@
+#ifndef QUEUE_H_SENTRY
+#define QUEUE_H_SENTRY
+
+#include "types.h"
+
+void qinit(queue *item);
+
+void qput(queue *item, particle data);
+
+void qget(queue *item, particle *data);
+
+int qempty(queue *item);
+
+#endif

settings.h

@@ -0,0 +1,20 @@
+#ifndef SETTINGS_H_SENTRY
+#define SETTINGS_H_SENTRY
+
+#ifndef WINDOW_WIDTH
+#define WINDOW_WIDTH 800
+#endif
+
+#ifndef WINDOW_HEIGHT
+#define WINDOW_HEIGHT 600
+#endif
+
+#ifndef FPS
+#define FPS 120
+#endif
+
+#ifndef TARGET_FRAME_TIME
+#define TARGET_FRAME_TIME (1000 / FPS)
+#endif
+
+#endif

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