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Converting DX8 to DX9

Started by polaris2013 Dec 10, 2006 at 9:16 AM 1 replies 2k views

Original Post

polaris2013

Dec 10, 2006 at 9:16 AM

Hello! I started DirectX with andypike's DX8 tutorial, but when I got a new computer I found out that the new DX SDK had removed the DX8 headers. So I am porting everything to DX9! I had hoped it would be a simple matter of changing 8's to 9's, but alas, it is not. The biggest problem I'm having is how to detect the display mode? Previously, I was using something like this (okay, exactly like this):


D3DFORMAT CGame::CheckDisplayMode(UINT nWidth, UINT nHeight, UINT nDepth)
{
	UINT x;
	D3DDISPLAYMODE d3ddm;

	for(x = 0; x < m_pD3D->GetAdapterModeCount(0); x++) //~(0, d3ddm.Format)
	{
		m_pD3D->EnumAdapterModes(0, x, &d3ddm); //~(0, d3ddm.Format, x, &d3ddm)
		if(d3ddm.Width == nWidth)
		{
			if(d3ddm.Height == nHeight)
			{
				if((d3ddm.Format == D3DFMT_R5G6B5) || (d3ddm.Format == D3DFMT_X1R5G5B5) || (d3ddm.Format == D3DFMT_X4R4G4B4))
				{
					if(nDepth == 16)
					{
						return d3ddm.Format;
					}
				}
				else if((d3ddm.Format == D3DFMT_R8G8B8) || (d3ddm.Format == D3DFMT_X8R8G8B8))
				{
					if(nDepth == 32)
					{
						return d3ddm.Format;
					}
				}
			}
		}
	}

	return D3DFMT_UNKNOWN;
}

Unfortunately in DX9 this doesn't work because you already need to know the display mode before you can even call this function! And that was the whole point! There is a pretty cool function IDirect3DSwapChain9::GetDisplayMode but unfortunately it's part of this thing called a "Swap Chain." What's that? Is there another way to do this? If I have any other problems I'll post 'em here, but this looks like the only irresolvable one.

jammanut

Dec 10, 2006 at 9:37 AM

Hi,

I've just checked the documentation that comes with the October 2006 edition of the DirectX 9 SDK and I found this [cut'n paste]:

========
IDirect3D9::GetAdapterDisplayMode
Retrieves the current display mode of the adapter.

HRESULT GetAdapterDisplayMode(
UINT Adapter,
D3DDISPLAYMODE * pMode
);

Parameters
Adapter
[in] Ordinal number that denotes the display adapter to query. D3DADAPTER_DEFAULT is always the primary display adapter.
pMode
[in, out] Pointer to a D3DDISPLAYMODE structure, to be filled with information describing the current adapter's mode.
Return Values
If the method succeeds, the return value is D3D_OK.
If Adapter is out of range or pMode is invalid, this method returns D3DERR_INVALIDCALL.

Remarks
IDirect3D9::GetAdapterDisplayMode will not return the correct format when the display is in an extended format, such as 2:10:10:10. Instead, it returns the format X8R8G8B8.

Requirements
Header: Declared in D3d9.h.
========

I hope this helps.
Jon

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