about SwapChains

Graphics and GPU Programming Programming

Started by longlong9 January 16, 2014 02:52 AM

2 comments, last by longlong9 10 years, 3 months ago

longlong9

130

Author

January 16, 2014 02:52 AM

hello?i have a problem.

i createdevice , then it will create implicit swapchain, i call GetNumberOfSwapChains ,i get the num is 1, then i call CreateAdditionalSwapChain

then GetNumberOfSwapChains,i get the num also is 1.why it is not increase to 2??

Jason Z

6,437

January 16, 2014 03:03 AM

Do you have the debug device enabled, and if so, are you getting any debug messages when you run your program? Also, did you check the HRESULT of the CreateAdditionSwapChain method?

Jason Zink :: DirectX MVP

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L. Spiro

25,818

January 16, 2014 03:20 AM

The documentation explicitly states that IDirect3DDevice9::GetNumberOfSwapChains() returns the number of implicit swap chains created by IDirect3D9::CreateDevice().

That means swap chains created by IDirect3DDevice9::CreateAdditionalSwapChain() are not counted.

It is behaving as it should.

If you need to know how many swap chains you have, it is IDirect3DDevice9::GetNumberOfSwapChains() + (each successful call to IDirect3DDevice9::CreateAdditionalSwapChain()).

L. Spiro

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longlong9

130

Author

January 16, 2014 03:44 AM

ok! thanks!