fixbug: cpp-test -> NewRenderer （drag the layer to test the result of…

… culling）, some object will be culling before out of screen.

cocos/renderer/CCRenderer.cpp

@@ -1031,32 +1031,27 @@ bool Renderer::checkVisibility(const Mat4 &transform, const Size &size)
     // only cull the default camera. The culling algorithm is valid for default camera.
     if (scene && scene->_defaultCamera != Camera::getVisitingCamera())
         return true;
-
-    // half size of the screen
-    Size screen_half = Director::getInstance()->getWinSize();
-    screen_half.width /= 2;
-    screen_half.height /= 2;
 
+    auto director = Director::getInstance();
+    Rect visiableRect(director->getVisibleOrigin(), director->getVisibleSize());
+
+    // transform center point to screen space
     float hSizeX = size.width/2;
     float hSizeY = size.height/2;
-
-    Vec4 v4world, v4local;
-    v4local.set(hSizeX, hSizeY, 0, 1);
-    transform.transformVector(v4local, &v4world);
-
-    // center of screen is (0,0)
-    v4world.x -= screen_half.width;
-    v4world.y -= screen_half.height;
+    Vec3 v3p(hSizeX, hSizeY, 0);
+    transform.transformPoint(&v3p);
+    Vec2 v2p = Camera::getVisitingCamera()->projectGL(v3p);
 
     // convert content size to world coordinates
     float wshw = std::max(fabsf(hSizeX * transform.m[0] + hSizeY * transform.m[4]), fabsf(hSizeX * transform.m[0] - hSizeY * transform.m[4]));
     float wshh = std::max(fabsf(hSizeX * transform.m[1] + hSizeY * transform.m[5]), fabsf(hSizeX * transform.m[1] - hSizeY * transform.m[5]));
-
-    // compare if it in the positive quadrant of the screen
-    float tmpx = (fabsf(v4world.x)-wshw);
-    float tmpy = (fabsf(v4world.y)-wshh);
-    bool ret = (tmpx < screen_half.width && tmpy < screen_half.height);
-
+
+    // enlarge visable rect half size in screen coord
+    visiableRect.origin.x -= wshw;
+    visiableRect.origin.y -= wshh;
+    visiableRect.size.width += wshw * 2;
+    visiableRect.size.height += wshh * 2;
+    bool ret = visiableRect.containsPoint(v2p);
     return ret;
 }