Update GetCollisionRec (#3052)

* Update rshapes.c

Add a much more efficient GetCollisionRec implementation

* Update GetCollisionRec

Replace macros with ternary operators

src/rshapes.c

@@ -1756,70 +1756,29 @@ bool CheckCollisionPointLine(Vector2 point, Vector2 p1, Vector2 p2, int threshol
 }
 
 // Get collision rectangle for two rectangles collision
-Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2)
-{
-    Rectangle rec = { 0, 0, 0, 0 };
-
-    if (CheckCollisionRecs(rec1, rec2))
-    {
-        float dxx = fabsf(rec1.x - rec2.x);
-        float dyy = fabsf(rec1.y - rec2.y);
-
-        if (rec1.x <= rec2.x)
-        {
-            if (rec1.y <= rec2.y)
-            {
-                rec.x = rec2.x;
-                rec.y = rec2.y;
-                rec.width = rec1.width - dxx;
-                rec.height = rec1.height - dyy;
-            }
-            else
-            {
-                rec.x = rec2.x;
-                rec.y = rec1.y;
-                rec.width = rec1.width - dxx;
-                rec.height = rec2.height - dyy;
-            }
-        }
-        else
-        {
-            if (rec1.y <= rec2.y)
-            {
-                rec.x = rec1.x;
-                rec.y = rec2.y;
-                rec.width = rec2.width - dxx;
-                rec.height = rec1.height - dyy;
-            }
-            else
-            {
-                rec.x = rec1.x;
-                rec.y = rec1.y;
-                rec.width = rec2.width - dxx;
-                rec.height = rec2.height - dyy;
-            }
-        }
-
-        if (rec1.width > rec2.width)
-        {
-            if (rec.width >= rec2.width) rec.width = rec2.width;
-        }
-        else
-        {
-            if (rec.width >= rec1.width) rec.width = rec1.width;
-        }
-
-        if (rec1.height > rec2.height)
-        {
-            if (rec.height >= rec2.height) rec.height = rec2.height;
-        }
-        else
-        {
-           if (rec.height >= rec1.height) rec.height = rec1.height;
-        }
+Rectangle GetCollisionRec(Rectangle rec1, Rectangle rec2){
+    Rectangle overlap;
+    float left = ((rec1.x) > (rec2.x) ? (rec1.x) : (rec2.x));
+    float right1 = rec1.x + rec1.width;
+    float right2 = rec2.x + rec2.width;
+    float right = ((right1) < (right2) ? (right1) : (right2));
+    float top = ((rec1.y) > (rec2.y) ? (rec1.y) : (rec2.y));
+    float bottom1 = rec1.y + rec1.height;
+    float bottom2 = rec2.y + rec2.height;
+    float bottom = ((bottom1) < (bottom2) ? (bottom1) : (bottom2));
+    if (left < right && top < bottom){
+        overlap.x = (left);
+        overlap.y = (top);
+        overlap.width = (right - left );
+        overlap.height = (bottom - top);
     }
-
-    return rec;
+    else{
+        overlap.x = 0;
+        overlap.y = 0;
+        overlap.width = 0;
+        overlap.height = 0;
+    }
+    return overlap;
 }
 
 //----------------------------------------------------------------------------------