DirectX10輸出內容到wxWidgets窗口

int Engine::Init(wxWindow* handle, bool windowed)
{
	m_WindowHandle = handle;

	wxRect rc  = handle->GetClientRect();
	int width  = rc.width;
	int height = rc.height;

	//Set up DX swapchain
	DXGI_SWAP_CHAIN_DESC swapChainDesc;
	memset(&swapChainDesc, 0, sizeof(swapChainDesc));

	swapChainDesc.BufferCount = 2;
	swapChainDesc.BufferDesc.Width = width;
	swapChainDesc.BufferDesc.Height = height;
	swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
	swapChainDesc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;

	//refresh rate
	swapChainDesc.BufferDesc.RefreshRate.Numerator = 60;
	swapChainDesc.BufferDesc.RefreshRate.Denominator = 1;

	//sampling setting
	swapChainDesc.SampleDesc.Quality = 0;
	swapChainDesc.SampleDesc.Count = 1;

	//target window
	HWND hWnd = (HWND) handle->GetHandle();
	swapChainDesc.OutputWindow = hWnd;
	swapChainDesc.Windowed = windowed;

	//Create D3D device
	if (FAILED(D3D10CreateDeviceAndSwapChain(NULL, D3D10_DRIVER_TYPE_HARDWARE, NULL, 0, D3D10_SDK_VERSION, &swapChainDesc, &m_SwapChain, &m_D3DDevice)))
		return false;

	//Rasterizer Stage Setup
	m_Viewport.Width = width;
	m_Viewport.Height = height;
	m_Viewport.MinDepth = 0.0f;
	m_Viewport.MaxDepth = 1.0f;
	m_Viewport.TopLeftX = 0;
	m_Viewport.TopLeftY = 0;

	m_D3DDevice->RSSetViewports(1, &m_Viewport);

	D3D10_RASTERIZER_DESC rasterState;
	rasterState.CullMode = D3D10_CULL_NONE;
	rasterState.FillMode = D3D10_FILL_SOLID;
	rasterState.FrontCounterClockwise = true;
	rasterState.DepthBias = false;
	rasterState.DepthBiasClamp = 0;
	rasterState.SlopeScaledDepthBias = 0;
	rasterState.DepthClipEnable = true;
	rasterState.ScissorEnable = false;
	rasterState.MultisampleEnable = false;
	rasterState.AntialiasedLineEnable = true;

	m_D3DDevice->CreateRasterizerState(&rasterState, &m_RasterizerState);
	m_D3DDevice->RSSetState(m_RasterizerState);

	//OM Stage
	ID3D10Texture2D* backBuffer;
	if (FAILED(m_SwapChain->GetBuffer(0, __uuidof(ID3D10Texture2D), (LPVOID*) &backBuffer)))
		return false;

	if (FAILED(m_D3DDevice->CreateRenderTargetView(backBuffer, NULL, &m_RenderTargetView)))
		return false;

	m_D3DDevice->OMSetRenderTargets(1, &m_RenderTargetView, NULL);



	//Setup the view and projection matrices
	D3DXVECTOR3 camera[3] = { D3DXVECTOR3(0, 0, -5),
								D3DXVECTOR3(0, 0, 1),
								D3DXVECTOR3(0, 1, 0) };
	D3DXMatrixLookAtLH(&m_ViewMatrix, &camera[0], &camera[1], &camera[2]);
	D3DXMatrixPerspectiveFovLH(&m_projectionMatrix, (float)D3DX_PI * 0.5f, (float)width/(float)height, 0.1f, 1000.f);

	return true;
}

上面的代碼中，核心是窗口句柄的取得，其他對DirectX10的初始化來說，都是一樣的。也就是，DirectX10只知道窗口句柄，知道窗口句柄後，就能得到窗口的DC，得到窗口的DC後，窗口的內容佔有的視屏位置也就知道了。

類似上面的代碼初始化後，我們用wxWidgets的窗口的話，還需要重載這個窗口類的OnPaint()

void wxDXView::OnPaint(wxPaintEvent& evt)
{
	m_Engine->Clear();
}

m_Engine的Clear代碼如下：

void Engine::Clear()
{
	float color[4] = { 0, 0.5, 1, 1};
	m_D3DDevice->ClearRenderTargetView(m_RenderTargetView, color);
	m_SwapChain->Present(0, 0);
}

這樣的話，隨着clear被調用，我們的窗口就被繪製成了需要的顏色。就可以看到DX的輸出了。後續的場景繪製，都放在OnPaint()中，Clear()後，注意的是，Engine->Clear()中的m_SwapChain->Present()需要放到別的位置。