Thanks for reply. anyway I found the issue in my code and fixed then after it is working fine. issue was that I am having single vertex buffer for my 7 rects and I was setting vertex offset for each rect because I know from where my rect's vertex data start in vertex buffer. same offset setting I am doing for index buffer of the 7 rects while calling drawindexedprimitives. when I removed offset setting in vertex buffer and always set it to 0 then it worked correctly.

one more thing my app is Xamarin based that links a static library written in c++,objective-c code so when I attach my Xamarin app process with Xcode then GPU capture frame feature is disabled . GPU frame capture only works when app is written in Xcode only not in xamarin using visual studio Mac . I really want to see GPU frame for my Xamarin app so please tell me any other way or any other tool for it.

Thanks iPerKard for the reply. I will try it.