Fix assetion fail in drawOrder enabled

Author: halx99

core/2d/DrawNode.cpp

@@ -830,7 +830,7 @@ void DrawNode::_drawPolygon(const Vec2* verts,
 
     auto _vertices = _transform(verts, count, closedPolygon);
 
-    std::vector<V2F_C4F_T2F_Triangle> triangleList;
+    axstd::pod_vector<V2F_C4F_T2F_Triangle> triangleList;
 
     int vertex_count = 0;
 

core/renderer/CustomCommand.cpp

@@ -201,6 +201,9 @@ void CustomCommand::setVertexBuffer(backend::Buffer* vertexBuffer)
     AX_SAFE_RELEASE(_vertexBuffer);
     _vertexBuffer = vertexBuffer;
     AX_SAFE_RETAIN(_vertexBuffer);
+
+    if (!_vertexBuffer)
+        _vertexCapacity = _vertexDrawCount = 0;
 }
 
 void CustomCommand::setIndexBuffer(backend::Buffer* indexBuffer, IndexFormat format)
@@ -214,6 +217,9 @@ void CustomCommand::setIndexBuffer(backend::Buffer* indexBuffer, IndexFormat for
 
     _indexFormat = format;
     _indexSize   = computeIndexSize();
+
+    if(!_indexBuffer)
+        _indexCapacity = _indexDrawCount = 0;
 }
 
 void CustomCommand::updateVertexBuffer(const void* data, std::size_t length)