depth buffering ftw

hw3d/App.cpp

@@ -23,6 +23,11 @@ void App::DoFrame()
 {
 	const float c = sin( timer.Peek() ) / 2.0f + 0.5f;
 	wnd.Gfx().ClearBuffer( c,c,1.0f );
+	wnd.Gfx().DrawTestTriangle(
+		-timer.Peek(),
+		0.0f,
+		0.0f
+	);
 	wnd.Gfx().DrawTestTriangle(
 		timer.Peek(),
 		wnd.mouse.GetPosX() / 400.0f - 1.0f,

hw3d/Graphics.cpp

@@ -74,6 +74,43 @@ Graphics::Graphics( HWND hWnd )
 	wrl::ComPtr<ID3D11Resource> pBackBuffer;
 	GFX_THROW_INFO( pSwap->GetBuffer( 0,__uuidof(ID3D11Resource),&pBackBuffer ) );
 	GFX_THROW_INFO( pDevice->CreateRenderTargetView( pBackBuffer.Get(),nullptr,&pTarget ) );
+	
+	// create depth stensil state
+	D3D11_DEPTH_STENCIL_DESC dsDesc = {};
+	dsDesc.DepthEnable = TRUE;
+	dsDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
+	dsDesc.DepthFunc = D3D11_COMPARISON_LESS;
+	wrl::ComPtr<ID3D11DepthStencilState> pDSState;
+	GFX_THROW_INFO( pDevice->CreateDepthStencilState( &dsDesc,&pDSState ) );
+
+	// bind depth state
+	pContext->OMSetDepthStencilState( pDSState.Get(),1u );
+
+	// create depth stensil texture
+	wrl::ComPtr<ID3D11Texture2D> pDepthStencil;
+	D3D11_TEXTURE2D_DESC descDepth = {};
+	descDepth.Width = 800u;
+	descDepth.Height = 600u;
+	descDepth.MipLevels = 1u;
+	descDepth.ArraySize = 1u;
+	descDepth.Format = DXGI_FORMAT_D32_FLOAT;
+	descDepth.SampleDesc.Count = 1u;
+	descDepth.SampleDesc.Quality = 0u;
+	descDepth.Usage = D3D11_USAGE_DEFAULT;
+	descDepth.BindFlags = D3D11_BIND_DEPTH_STENCIL;
+	GFX_THROW_INFO( pDevice->CreateTexture2D( &descDepth,nullptr,&pDepthStencil ) );
+
+	// create view of depth stensil texture
+	D3D11_DEPTH_STENCIL_VIEW_DESC descDSV = {};
+	descDSV.Format = DXGI_FORMAT_D32_FLOAT;
+	descDSV.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
+	descDSV.Texture2D.MipSlice = 0u;
+	GFX_THROW_INFO( pDevice->CreateDepthStencilView(
+		pDepthStencil.Get(),&descDSV,&pDSV
+	) );
+
+	// bind depth stensil view to OM
+	pContext->OMSetRenderTargets( 1u,pTarget.GetAddressOf(),pDSV.Get() );
 }
 
 void Graphics::EndFrame()
@@ -99,9 +136,10 @@ void Graphics::ClearBuffer( float red,float green,float blue ) noexcept
 {
 	const float color[] = { red,green,blue,1.0f };
 	pContext->ClearRenderTargetView( pTarget.Get(),color );
+	pContext->ClearDepthStencilView( pDSV.Get(),D3D11_CLEAR_DEPTH,1.0f,0u );
 }
 
-void Graphics::DrawTestTriangle( float angle,float x,float y )
+void Graphics::DrawTestTriangle( float angle,float x,float z )
 {
 	HRESULT hr;
 
@@ -182,7 +220,7 @@ void Graphics::DrawTestTriangle( float angle,float x,float y )
 			dx::XMMatrixTranspose(
 				dx::XMMatrixRotationZ( angle ) *
 				dx::XMMatrixRotationX( angle ) *
-				dx::XMMatrixTranslation( x,y,4.0f ) *
+				dx::XMMatrixTranslation( x,0.0f,z + 4.0f ) *
 				dx::XMMatrixPerspectiveLH( 1.0f,3.0f / 4.0f,0.5f,10.0f )
 			)
 		}
@@ -278,10 +316,6 @@ void Graphics::DrawTestTriangle( float angle,float x,float y )
 	pContext->IASetInputLayout( pInputLayout.Get() );
 
 
-	// bind render target
-	pContext->OMSetRenderTargets( 1u,pTarget.GetAddressOf(),nullptr );
-
-
 	// Set primitive topology to triangle list (groups of 3 vertices)
 	pContext->IASetPrimitiveTopology( D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST );
 

hw3d/Graphics.h

@@ -61,4 +61,5 @@ private:
 	Microsoft::WRL::ComPtr<IDXGISwapChain> pSwap;
 	Microsoft::WRL::ComPtr<ID3D11DeviceContext> pContext;
 	Microsoft::WRL::ComPtr<ID3D11RenderTargetView> pTarget;
+	Microsoft::WRL::ComPtr<ID3D11DepthStencilView> pDSV;
 };
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