fix bug:use wrong _modelviewTransform in director to draw bone

cocos/editor-support/cocostudio/ActionTimeline/CCSkeletonNode.cpp

@@ -145,29 +145,75 @@ void SkeletonNode::updateColor()
     _transformUpdated = _transformDirty = _inverseDirty = _contentSizeDirty = true;
 }
 
-
 void SkeletonNode::visit(cocos2d::Renderer *renderer, const cocos2d::Mat4& parentTransform, uint32_t parentFlags)
 {
-    BoneNode::visit(renderer, parentTransform, parentFlags);
+    // quick return if not visible. children won't be drawn.
-    if (_visible && _isRackShow)
+    if (!_visible)
     {
-        _customCommand.init(_globalZOrder, parentTransform, parentFlags);
+        return;
-        _customCommand.func = CC_CALLBACK_0(SkeletonNode::onDraw, this, parentTransform, parentFlags);
+    }
-        renderer->addCommand(&_customCommand);
+
-        for (int i = 0; i < 8; ++i)
+    uint32_t flags = processParentFlags(parentTransform, parentFlags);
+
+    // IMPORTANT:
+    // To ease the migration to v3.0, we still support the Mat4 stack,
+    // but it is deprecated and your code should not rely on it
+    _director->pushMatrix(cocos2d::MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
+    _director->loadMatrix(cocos2d::MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW, _modelViewTransform);
+
+    bool visibleByCamera = isVisitableByVisitingCamera();
+
+    int i = 0;
+
+    if (!_children.empty())
+    {
+        sortAllChildren();
+        // draw children zOrder < 0
+        for (; i < _children.size(); i++)
         {
-            cocos2d::Vec4 pos;
+            auto node = _children.at(i);
-            pos.x = _squareVertices[i].x; pos.y = _squareVertices[i].y; pos.z = _positionZ;
+
-            pos.w = 1;
+            if (node && node->getLocalZOrder() < 0)
-            _modelViewTransform.transformVector(&pos);
+                node->visit(renderer, _modelViewTransform, flags);
-            _noMVPVertices[i] = cocos2d::Vec3(pos.x, pos.y, pos.z) / pos.w;
+            else
+                break;
         }
 
-        this->draw(renderer, parentTransform, parentFlags);
+        for (auto it = _children.cbegin() + i; it != _children.cend(); ++it)
-        _batchBoneCommand.init(_globalZOrder, parentTransform, parentFlags);
+            (*it)->visit(renderer, _modelViewTransform, flags);
-        _batchBoneCommand.func = CC_CALLBACK_0(SkeletonNode::batchDrawAllSubBones, this, parentTransform);
+    }
+
+    if (visibleByCamera)
+    {
+        this->draw(renderer, _modelViewTransform, flags);
+        // batch draw all sub bones
+        _batchBoneCommand.init(_globalZOrder, _modelViewTransform, parentFlags);
+        _batchBoneCommand.func = CC_CALLBACK_0(SkeletonNode::batchDrawAllSubBones, this, _modelViewTransform);
         renderer->addCommand(&_batchBoneCommand);
     }
+    _director->popMatrix(cocos2d::MATRIX_STACK_TYPE::MATRIX_STACK_MODELVIEW);
+    // FIX ME: Why need to set _orderOfArrival to 0??
+    // Please refer to https://github.com/cocos2d/cocos2d-x/pull/6920
+    // reset for next frame
+    // _orderOfArrival = 0;
+}
+
+void SkeletonNode::draw(cocos2d::Renderer *renderer, const cocos2d::Mat4 &transform, uint32_t flags)
+{
+    if (!_isRackShow)
+        return;
+
+    _customCommand.init(_globalZOrder, transform, flags);
+    _customCommand.func = CC_CALLBACK_0(SkeletonNode::onDraw, this, transform, flags);
+    renderer->addCommand(&_customCommand);
+    for (int i = 0; i < 8; ++i)
+    {
+        cocos2d::Vec4 pos;
+        pos.x = _squareVertices[i].x; pos.y = _squareVertices[i].y; pos.z = _positionZ;
+        pos.w = 1;
+        _modelViewTransform.transformVector(&pos);
+        _noMVPVertices[i] = cocos2d::Vec3(pos.x, pos.y, pos.z) / pos.w;
+    }
 }
 
 void SkeletonNode::batchDrawAllSubBones(const cocos2d::Mat4 &transform)

cocos/editor-support/cocostudio/ActionTimeline/CCSkeletonNode.h

@@ -82,6 +82,7 @@ protected:
     virtual void updateColor() override;
 
     virtual void visit(cocos2d::Renderer *renderer, const cocos2d::Mat4& parentTransform, uint32_t parentFlags) override;
+    virtual void draw(cocos2d::Renderer *renderer, const cocos2d::Mat4 &transform, uint32_t flags) override;
     virtual void onDraw(const cocos2d::Mat4 &transform, uint32_t flags) override;
 
 protected: