Merge pull request #131 from victorfisac/develop

Physac 1.0 module completed

.gitignore

@@ -73,3 +73,4 @@ src/libraylib.bc
 !src/external/glfw3/lib/win32/glfw3.dll
 !src/external/openal_soft/lib/win32/OpenAL32.dll
 !src/external/OculusSDK/LibOVR/LibOVRRT32_1.dll
+!src/external/pthread/pthreadGC2.dll

examples/physics_basic_rigidbody.c

@@ -5,6 +5,10 @@
 *   This example has been created using raylib 1.5 (www.raylib.com)
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
 *
+*
+*   Compile example using:
+*   cmd /c IF NOT EXIST pthreadGC2.dll copy C:\raylib\raylib\src\external\pthread\pthreadGC2.dll $(CURRENT_DIRECTORY) /Y
+*
 *   Copyright (c) 2016 Victor Fisac and Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/
@@ -25,7 +29,6 @@ int main()
     int screenHeight = 450;
 
     InitWindow(screenWidth, screenHeight, "raylib [physac] example - basic rigidbody");
-    
     InitPhysics((Vector2){ 0.0f, -9.81f/2 });      // Initialize physics module
     
     // Debug variables
@@ -61,10 +64,8 @@ int main()
     {
         // Update
         //----------------------------------------------------------------------------------        
-        UpdatePhysics();    // Update all created physic objects
-        
         // Check rectangle movement inputs
-        if (IsKeyDown('W') && rectangle->rigidbody.isGrounded) rectangle->rigidbody.velocity.y = JUMP_VELOCITY;
+        if (IsKeyPressed('W')) rectangle->rigidbody.velocity.y = JUMP_VELOCITY;
         if (IsKeyDown('A')) rectangle->rigidbody.velocity.x = -MOVE_VELOCITY;
         else if (IsKeyDown('D')) rectangle->rigidbody.velocity.x = MOVE_VELOCITY;
         
@@ -111,6 +112,8 @@ int main()
             // Draw help message
             DrawText("Use WASD to move rectangle and ARROWS to move square", screenWidth/2 - MeasureText("Use WASD to move rectangle and ARROWS to move square", 20)/2, screenHeight*0.075f, 20, LIGHTGRAY);
 
+            DrawFPS(10, 10);
+            
         EndDrawing();
         //----------------------------------------------------------------------------------
     }
@@ -118,7 +121,6 @@ int main()
     // De-Initialization
     //--------------------------------------------------------------------------------------
     ClosePhysics();       // Unitialize physics (including all loaded objects)
-    
     CloseWindow();        // Close window and OpenGL context
     //--------------------------------------------------------------------------------------
 

examples/physics_forces.c

@@ -5,6 +5,11 @@
 *   This example has been created using raylib 1.5 (www.raylib.com)
 *   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
 *
+*   NOTE: This example requires raylib module [rlgl]
+*
+*   Compile example using:
+*   cmd /c IF NOT EXIST pthreadGC2.dll copy C:\raylib\raylib\src\external\pthread\pthreadGC2.dll $(CURRENT_DIRECTORY) /Y
+*
 *   Copyright (c) 2016 Victor Fisac and Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/
@@ -27,7 +32,6 @@ int main()
     int screenHeight = 450;
 
     InitWindow(screenWidth, screenHeight, "raylib [physac] example - forces");
-    
     InitPhysics((Vector2){ 0.0f, -9.81f/2 });      // Initialize physics module
     
     // Global variables
@@ -69,7 +73,6 @@ int main()
     {
         // Update
         //----------------------------------------------------------------------------------
-        UpdatePhysics();    // Update all created physic objects
         
         // Update mouse position value
         mousePosition = GetMousePosition();
@@ -168,6 +171,8 @@ int main()
             DrawText("Use LEFT MOUSE BUTTON to apply a force", screenWidth/2 - MeasureText("Use LEFT MOUSE BUTTON to apply a force", 20)/2, screenHeight*0.075f, 20, LIGHTGRAY);
             DrawText("Use R to reset objects position", screenWidth/2 - MeasureText("Use R to reset objects position", 20)/2, screenHeight*0.875f, 20, GRAY);
             
+            DrawFPS(10, 10);
+
         EndDrawing();
         //----------------------------------------------------------------------------------
     }
@@ -175,7 +180,6 @@ int main()
     // De-Initialization
     //--------------------------------------------------------------------------------------
     ClosePhysics();       // Unitialize physics module
-    
     CloseWindow();        // Close window and OpenGL context
     //--------------------------------------------------------------------------------------
 

src/physac.h

@@ -15,6 +15,10 @@
 *       The generated implementation will stay private inside implementation file and all 
 *       internal symbols and functions will only be visible inside that file.
 *
+*   #define PHYSAC_NO_THREADS
+*       The generated implementation won't include pthread library and user must create a secondary thread to call PhysicsThread().
+*       It is so important that the thread where PhysicsThread() is called must not have v-sync or any other CPU limitation.
+*
 *   #define PHYSAC_STANDALONE
 *       Avoid raylib.h header inclusion in this file. Data types defined on raylib are defined
 *       internally in the library and input management and drawing functions must be provided by
@@ -27,12 +31,16 @@
 *       
 *   LIMITATIONS:
 *
-*       // TODO.
+*       - There is a limit of 256 physic objects.
+*       - Physics behaviour can be unexpected using bounciness or friction values out of 0.0f - 1.0f range.
+*       - The module is limited to 2D axis oriented physics.
+*       - Physics colliders must be rectangle or circle shapes (there is not a custom polygon collider type).
 *
 *   VERSIONS:
 *
-*   1.0 (09-Jun-2016) Module names review and converted to header-only.
-*   0.9 (23-Mar-2016) Complete module redesign, steps-based for better physics resolution.
+*   1.0 (14-Jun-2016) New module defines and fixed some delta time calculation bugs.
+*   0.9 (09-Jun-2016) Module names review and converted to header-only.
+*   0.8 (23-Mar-2016) Complete module redesign, steps-based for better physics resolution.
 *   0.3 (13-Feb-2016) Reviewed to add PhysicObjects pool.
 *   0.2 (03-Jan-2016) Improved physics calculations.
 *   0.1 (30-Dec-2015) Initial release.
@@ -146,7 +154,7 @@ typedef struct PhysicBodyData {
 // Module Functions Declaration
 //----------------------------------------------------------------------------------
 PHYSACDEF void InitPhysics(Vector2 gravity);                                            // Initializes pointers array (just pointers, fixed size)
-PHYSACDEF void UpdatePhysics();                                                         // Update physic objects, calculating physic behaviours and collisions detection
+PHYSACDEF void* PhysicsThread(void *arg);                                               // Physics calculations thread function
 PHYSACDEF void ClosePhysics();                                                          // Unitialize all physic objects and empty the objects pool
 
 PHYSACDEF PhysicBody CreatePhysicBody(Vector2 position, float rotation, Vector2 scale); // Create a new physic body dinamically, initialize it and add to pool
@@ -177,12 +185,26 @@ PHYSACDEF Rectangle TransformToRectangle(Transform transform);
 #endif
 
 #include <math.h>           // Required for: cos(), sin(), abs(), fminf()
+#include <stdint.h>         // Required for typedef unsigned long long int uint64_t, used by hi-res timer
+
+#ifndef PHYSAC_NO_THREADS
+    #include <pthread.h>        // Required for: pthread_create()
+#endif
+
+#if defined(PLATFORM_DESKTOP)
+    // Functions required to query time on Windows
+    int __stdcall QueryPerformanceCounter(unsigned long long int *lpPerformanceCount);
+    int __stdcall QueryPerformanceFrequency(unsigned long long int *lpFrequency);
+#elif defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI)
+    #include <sys/time.h>       // Required for: timespec
+    #include <time.h>           // Required for: clock_gettime()
+#endif
 
 //----------------------------------------------------------------------------------
 // Defines and Macros
 //----------------------------------------------------------------------------------
 #define MAX_PHYSIC_BODIES       256             // Maximum available physic bodies slots in bodies pool
-#define PHYSICS_STEPS            64             // Physics update steps per frame for improved collision-detection
+#define PHYSICS_TIMESTEP        0.016666        // Physics fixed time step (1/fps)
 #define PHYSICS_ACCURACY        0.0001f         // Velocity subtract operations round filter (friction)
 #define PHYSICS_ERRORPERCENT    0.001f          // Collision resolve position fix
 
@@ -195,6 +217,9 @@ PHYSACDEF Rectangle TransformToRectangle(Transform transform);
 //----------------------------------------------------------------------------------
 // Global Variables Definition
 //----------------------------------------------------------------------------------
+static bool physicsThreadEnabled = false;                           // Physics calculations thread exit control
+static uint64_t baseTime;                                           // Base time measure for hi-res timer
+static double currentTime, previousTime;                            // Used to track timmings
 static PhysicBody physicBodies[MAX_PHYSIC_BODIES];                  // Physic bodies pool
 static int physicBodiesCount;                                       // Counts current enabled physic bodies
 static Vector2 gravityForce;                                        // Gravity force
@@ -202,6 +227,9 @@ static Vector2 gravityForce;                                        // Gravity f
 //----------------------------------------------------------------------------------
 // Module specific Functions Declaration
 //----------------------------------------------------------------------------------
+static void UpdatePhysics(double deltaTime);                        // Update physic objects, calculating physic behaviours and collisions detection
+static void InitTimer(void);                                        // Initialize hi-resolution timer
+static double GetCurrentTime(void);                                 // Time measure returned are microseconds
 static float Vector2DotProduct(Vector2 v1, Vector2 v2);             // Returns the dot product of two Vector2
 static float Vector2Length(Vector2 v);                              // Returns the length of a Vector2
 
@@ -215,16 +243,223 @@ PHYSACDEF void InitPhysics(Vector2 gravity)
     // Initialize physics variables
     physicBodiesCount = 0;
     gravityForce = gravity;
+    
+    #ifndef PHYSAC_NO_THREADS       // NOTE: if defined, user will need to create a thread for PhysicsThread function manually
+        // Create physics thread
+        pthread_t tid;
+        pthread_create(&tid, NULL, &PhysicsThread, NULL);
+    #endif
+}
+
+// Unitialize all physic objects and empty the objects pool
+PHYSACDEF void ClosePhysics()
+{
+    // Exit physics thread loop
+    physicsThreadEnabled = false;
+    
+    // Free all dynamic memory allocations
+    for (int i = 0; i < physicBodiesCount; i++) PHYSAC_FREE(physicBodies[i]);
+    
+    // Reset enabled physic objects count
+    physicBodiesCount = 0;
+}
+
+// Create a new physic body dinamically, initialize it and add to pool
+PHYSACDEF PhysicBody CreatePhysicBody(Vector2 position, float rotation, Vector2 scale)
+{
+    // Allocate dynamic memory
+    PhysicBody obj = (PhysicBody)PHYSAC_MALLOC(sizeof(PhysicBodyData));
+    
+    // Initialize physic body values with generic values
+    obj->id = physicBodiesCount;
+    obj->enabled = true;
+    
+    obj->transform = (Transform){ (Vector2){ position.x - scale.x/2, position.y - scale.y/2 }, rotation, scale };
+    
+    obj->rigidbody.enabled = false;
+    obj->rigidbody.mass = 1.0f;
+    obj->rigidbody.acceleration = (Vector2){ 0.0f, 0.0f };
+    obj->rigidbody.velocity = (Vector2){ 0.0f, 0.0f };
+    obj->rigidbody.applyGravity = false;
+    obj->rigidbody.isGrounded = false;
+    obj->rigidbody.friction = 0.0f;
+    obj->rigidbody.bounciness = 0.0f;
+    
+    obj->collider.enabled = true;
+    obj->collider.type = COLLIDER_RECTANGLE;
+    obj->collider.bounds = TransformToRectangle(obj->transform);
+    obj->collider.radius = 0.0f;
+    
+    // Add new physic body to the pointers array
+    physicBodies[physicBodiesCount] = obj;
+    
+    // Increase enabled physic bodies count
+    physicBodiesCount++;
+    
+    return obj;
+}
+
+// Destroy a specific physic body and take it out of the list
+PHYSACDEF void DestroyPhysicBody(PhysicBody pbody)
+{
+    // Free dynamic memory allocation
+    PHYSAC_FREE(physicBodies[pbody->id]);
+    
+    // Remove *obj from the pointers array
+    for (int i = pbody->id; i < physicBodiesCount; i++)
+    {
+        // Resort all the following pointers of the array
+        if ((i + 1) < physicBodiesCount)
+        {
+            physicBodies[i] = physicBodies[i + 1];
+            physicBodies[i]->id = physicBodies[i + 1]->id;
+        }
+        else PHYSAC_FREE(physicBodies[i]);
+    }
+    
+    // Decrease enabled physic bodies count
+    physicBodiesCount--;
+}
+
+// Apply directional force to a physic body
+PHYSACDEF void ApplyForce(PhysicBody pbody, Vector2 force)
+{
+    if (pbody->rigidbody.enabled)
+    {
+        pbody->rigidbody.velocity.x += force.x/pbody->rigidbody.mass;
+        pbody->rigidbody.velocity.y += force.y/pbody->rigidbody.mass;
+    }
+}
+
+// Apply radial force to all physic objects in range
+PHYSACDEF void ApplyForceAtPosition(Vector2 position, float force, float radius)
+{
+    for (int i = 0; i < physicBodiesCount; i++)
+    {
+        if (physicBodies[i]->rigidbody.enabled)
+        {
+            // Calculate direction and distance between force and physic body position
+            Vector2 distance = (Vector2){ physicBodies[i]->transform.position.x - position.x, physicBodies[i]->transform.position.y - position.y };
+
+            if (physicBodies[i]->collider.type == COLLIDER_RECTANGLE)
+            {
+                distance.x += physicBodies[i]->transform.scale.x/2;
+                distance.y += physicBodies[i]->transform.scale.y/2;
+            }
+            
+            float distanceLength = Vector2Length(distance);
+            
+            // Check if physic body is in force range
+            if (distanceLength <= radius)
+            {
+                // Normalize force direction
+                distance.x /= distanceLength;
+                distance.y /= -distanceLength;
+                
+                // Calculate final force
+                Vector2 finalForce = { distance.x*force, distance.y*force };
+                
+                // Apply force to the physic body
+                ApplyForce(physicBodies[i], finalForce);
+            }
+        }
+    }
+}
+
+// Convert Transform data type to Rectangle (position and scale)
+PHYSACDEF Rectangle TransformToRectangle(Transform transform)
+{
+    return (Rectangle){transform.position.x, transform.position.y, transform.scale.x, transform.scale.y};
+}
+
+// Physics calculations thread function
+PHYSACDEF void* PhysicsThread(void *arg)
+{
+    // Initialize thread loop state
+    physicsThreadEnabled = true;
+    
+    // Initialize hi-resolution timer
+    InitTimer();
+    
+    // Physics update loop
+    while (physicsThreadEnabled) 
+    {
+        currentTime = GetCurrentTime();
+        double deltaTime = (double)(currentTime - previousTime);
+        previousTime = currentTime;
+
+        // Delta time value needs to be inverse multiplied by physics time step value (1/target fps)
+        UpdatePhysics(deltaTime/PHYSICS_TIMESTEP);
+    }
+    
+    return NULL;
+}
+
+//----------------------------------------------------------------------------------
+// Module specific Functions Definition
+//----------------------------------------------------------------------------------
+// Initialize hi-resolution timer
+static void InitTimer(void)
+{
+#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI)
+    struct timespec now;
+
+    if (clock_gettime(CLOCK_MONOTONIC, &now) == 0)  // Success
+    {
+        baseTime = (uint64_t)now.tv_sec*1000000000LLU + (uint64_t)now.tv_nsec;
+    }
+#endif
+
+    previousTime = GetCurrentTime();       // Get time as double
+}
+
+// Time measure returned are microseconds
+static double GetCurrentTime(void)
+{
+    double time;
+    
+#if defined(PLATFORM_DESKTOP)
+    unsigned long long int clockFrequency, currentTime;
+    
+    QueryPerformanceFrequency(&clockFrequency);
+    QueryPerformanceCounter(&currentTime);
+    
+    time = (double)((double)currentTime/(double)clockFrequency);
+#endif
+
+#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI)
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    uint64_t temp = (uint64_t)ts.tv_sec*1000000000LLU + (uint64_t)ts.tv_nsec;
+
+    time = (double)(temp - baseTime)*1e-9;
+#endif
+
+    return time;
+}
+
+// Returns the dot product of two Vector2
+static float Vector2DotProduct(Vector2 v1, Vector2 v2)
+{
+    float result;
+
+    result = v1.x*v2.x + v1.y*v2.y;
+
+    return result;
+}
+
+static float Vector2Length(Vector2 v)
+{
+    float result;
+    
+    result = sqrt(v.x*v.x + v.y*v.y);
+    
+    return result;
 }
 
 // Update physic objects, calculating physic behaviours and collisions detection
-PHYSACDEF void UpdatePhysics()
+static void UpdatePhysics(double deltaTime)
 {
-    // Reset all physic objects is grounded state
-    for (int i = 0; i < physicBodiesCount; i++) physicBodies[i]->rigidbody.isGrounded = false;
-    
-    for (int steps = 0; steps < PHYSICS_STEPS; steps++)
-    {
     for (int i = 0; i < physicBodiesCount; i++)
     {
         if (physicBodies[i]->enabled)
@@ -233,39 +468,39 @@ PHYSACDEF void UpdatePhysics()
             if (physicBodies[i]->rigidbody.enabled)
             {
                 // Apply friction to acceleration in X axis
-                    if (physicBodies[i]->rigidbody.acceleration.x > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.x -= physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
-                    else if (physicBodies[i]->rigidbody.acceleration.x < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.x += physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
+                if (physicBodies[i]->rigidbody.acceleration.x > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.x -= physicBodies[i]->rigidbody.friction*deltaTime;
+                else if (physicBodies[i]->rigidbody.acceleration.x < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.x += physicBodies[i]->rigidbody.friction*deltaTime;
                 else physicBodies[i]->rigidbody.acceleration.x = 0.0f;
                 
                 // Apply friction to acceleration in Y axis
-                    if (physicBodies[i]->rigidbody.acceleration.y > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.y -= physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
-                    else if (physicBodies[i]->rigidbody.acceleration.y < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.y += physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
+                if (physicBodies[i]->rigidbody.acceleration.y > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.y -= physicBodies[i]->rigidbody.friction*deltaTime;
+                else if (physicBodies[i]->rigidbody.acceleration.y < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.acceleration.y += physicBodies[i]->rigidbody.friction*deltaTime;
                 else physicBodies[i]->rigidbody.acceleration.y = 0.0f;
                 
                 // Apply friction to velocity in X axis
-                    if (physicBodies[i]->rigidbody.velocity.x > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.x -= physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
-                    else if (physicBodies[i]->rigidbody.velocity.x < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.x += physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
+                if (physicBodies[i]->rigidbody.velocity.x > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.x -= physicBodies[i]->rigidbody.friction*deltaTime;
+                else if (physicBodies[i]->rigidbody.velocity.x < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.x += physicBodies[i]->rigidbody.friction*deltaTime;
                 else physicBodies[i]->rigidbody.velocity.x = 0.0f;
                 
                 // Apply friction to velocity in Y axis
-                    if (physicBodies[i]->rigidbody.velocity.y > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.y -= physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
-                    else if (physicBodies[i]->rigidbody.velocity.y < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.y += physicBodies[i]->rigidbody.friction/PHYSICS_STEPS;
+                if (physicBodies[i]->rigidbody.velocity.y > PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.y -= physicBodies[i]->rigidbody.friction*deltaTime;
+                else if (physicBodies[i]->rigidbody.velocity.y < PHYSICS_ACCURACY) physicBodies[i]->rigidbody.velocity.y += physicBodies[i]->rigidbody.friction*deltaTime;
                 else physicBodies[i]->rigidbody.velocity.y = 0.0f;
                 
                 // Apply gravity to velocity
                 if (physicBodies[i]->rigidbody.applyGravity)
                 {
-                        physicBodies[i]->rigidbody.velocity.x += gravityForce.x/PHYSICS_STEPS;
-                        physicBodies[i]->rigidbody.velocity.y += gravityForce.y/PHYSICS_STEPS;
+                    physicBodies[i]->rigidbody.velocity.x += gravityForce.x*deltaTime;
+                    physicBodies[i]->rigidbody.velocity.y += gravityForce.y*deltaTime;
                 }
                 
                 // Apply acceleration to velocity
-                    physicBodies[i]->rigidbody.velocity.x += physicBodies[i]->rigidbody.acceleration.x/PHYSICS_STEPS;
-                    physicBodies[i]->rigidbody.velocity.y += physicBodies[i]->rigidbody.acceleration.y/PHYSICS_STEPS;
+                physicBodies[i]->rigidbody.velocity.x += physicBodies[i]->rigidbody.acceleration.x*deltaTime;
+                physicBodies[i]->rigidbody.velocity.y += physicBodies[i]->rigidbody.acceleration.y*deltaTime;
                 
                 // Apply velocity to position
-                    physicBodies[i]->transform.position.x += physicBodies[i]->rigidbody.velocity.x/PHYSICS_STEPS;
-                    physicBodies[i]->transform.position.y -= physicBodies[i]->rigidbody.velocity.y/PHYSICS_STEPS;
+                physicBodies[i]->transform.position.x += physicBodies[i]->rigidbody.velocity.x*deltaTime;
+                physicBodies[i]->transform.position.y -= physicBodies[i]->rigidbody.velocity.y*deltaTime;
             }
             
             // Update collision detection
@@ -507,10 +742,7 @@ PHYSACDEF void UpdatePhysics()
                         }
                         
                         // Update rigidbody grounded state
-                            if (physicBodies[i]->rigidbody.enabled)
-                            {
-                                if (contactNormal.y < 0.0f) physicBodies[i]->rigidbody.isGrounded = true;
-                            }
+                        if (physicBodies[i]->rigidbody.enabled) physicBodies[i]->rigidbody.isGrounded = (contactNormal.y < 0.0f);
                         
                         // 2. Calculate collision impulse
                         // -------------------------------------------------------------------------------------------------------------------------------------
@@ -595,148 +827,6 @@ PHYSACDEF void UpdatePhysics()
             }
         }
     }
-    }
-}
-
-// Unitialize all physic objects and empty the objects pool
-PHYSACDEF void ClosePhysics()
-{
-    // Free all dynamic memory allocations
-    for (int i = 0; i < physicBodiesCount; i++) PHYSAC_FREE(physicBodies[i]);
-    
-    // Reset enabled physic objects count
-    physicBodiesCount = 0;
-}
-
-// Create a new physic body dinamically, initialize it and add to pool
-PHYSACDEF PhysicBody CreatePhysicBody(Vector2 position, float rotation, Vector2 scale)
-{
-    // Allocate dynamic memory
-    PhysicBody obj = (PhysicBody)PHYSAC_MALLOC(sizeof(PhysicBodyData));
-    
-    // Initialize physic body values with generic values
-    obj->id = physicBodiesCount;
-    obj->enabled = true;
-    
-    obj->transform = (Transform){ (Vector2){ position.x - scale.x/2, position.y - scale.y/2 }, rotation, scale };
-    
-    obj->rigidbody.enabled = false;
-    obj->rigidbody.mass = 1.0f;
-    obj->rigidbody.acceleration = (Vector2){ 0.0f, 0.0f };
-    obj->rigidbody.velocity = (Vector2){ 0.0f, 0.0f };
-    obj->rigidbody.applyGravity = false;
-    obj->rigidbody.isGrounded = false;
-    obj->rigidbody.friction = 0.0f;
-    obj->rigidbody.bounciness = 0.0f;
-    
-    obj->collider.enabled = true;
-    obj->collider.type = COLLIDER_RECTANGLE;
-    obj->collider.bounds = TransformToRectangle(obj->transform);
-    obj->collider.radius = 0.0f;
-    
-    // Add new physic body to the pointers array
-    physicBodies[physicBodiesCount] = obj;
-    
-    // Increase enabled physic bodies count
-    physicBodiesCount++;
-    
-    return obj;
-}
-
-// Destroy a specific physic body and take it out of the list
-PHYSACDEF void DestroyPhysicBody(PhysicBody pbody)
-{
-    // Free dynamic memory allocation
-    PHYSAC_FREE(physicBodies[pbody->id]);
-    
-    // Remove *obj from the pointers array
-    for (int i = pbody->id; i < physicBodiesCount; i++)
-    {
-        // Resort all the following pointers of the array
-        if ((i + 1) < physicBodiesCount)
-        {
-            physicBodies[i] = physicBodies[i + 1];
-            physicBodies[i]->id = physicBodies[i + 1]->id;
-        }
-        else PHYSAC_FREE(physicBodies[i]);
-    }
-    
-    // Decrease enabled physic bodies count
-    physicBodiesCount--;
-}
-
-// Apply directional force to a physic body
-PHYSACDEF void ApplyForce(PhysicBody pbody, Vector2 force)
-{
-    if (pbody->rigidbody.enabled)
-    {
-        pbody->rigidbody.velocity.x += force.x/pbody->rigidbody.mass;
-        pbody->rigidbody.velocity.y += force.y/pbody->rigidbody.mass;
-    }
-}
-
-// Apply radial force to all physic objects in range
-PHYSACDEF void ApplyForceAtPosition(Vector2 position, float force, float radius)
-{
-    for (int i = 0; i < physicBodiesCount; i++)
-    {
-        if (physicBodies[i]->rigidbody.enabled)
-        {
-            // Calculate direction and distance between force and physic body position
-            Vector2 distance = (Vector2){ physicBodies[i]->transform.position.x - position.x, physicBodies[i]->transform.position.y - position.y };
-
-            if (physicBodies[i]->collider.type == COLLIDER_RECTANGLE)
-            {
-                distance.x += physicBodies[i]->transform.scale.x/2;
-                distance.y += physicBodies[i]->transform.scale.y/2;
-            }
-            
-            float distanceLength = Vector2Length(distance);
-            
-            // Check if physic body is in force range
-            if (distanceLength <= radius)
-            {
-                // Normalize force direction
-                distance.x /= distanceLength;
-                distance.y /= -distanceLength;
-                
-                // Calculate final force
-                Vector2 finalForce = { distance.x*force, distance.y*force };
-                
-                // Apply force to the physic body
-                ApplyForce(physicBodies[i], finalForce);
-            }
-        }
-    }
-}
-
-// Convert Transform data type to Rectangle (position and scale)
-PHYSACDEF Rectangle TransformToRectangle(Transform transform)
-{
-    return (Rectangle){transform.position.x, transform.position.y, transform.scale.x, transform.scale.y};
-}
-
-//----------------------------------------------------------------------------------
-// Module specific Functions Definition
-//----------------------------------------------------------------------------------
-
-// Returns the dot product of two Vector2
-static float Vector2DotProduct(Vector2 v1, Vector2 v2)
-{
-    float result;
-
-    result = v1.x*v2.x + v1.y*v2.y;
-
-    return result;
-}
-
-static float Vector2Length(Vector2 v)
-{
-    float result;
-    
-    result = sqrt(v.x*v.x + v.y*v.y);
-    
-    return result;
 }
 
 #endif  // PHYSAC_IMPLEMENTATION