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simotix

DX11 [DX11] Full Screen Quad

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I am attempting to draw a full screen quad in DirectX11 but nothing seems to be rendering. I have disabled the DepthEnable in the DepthStencilState (if I did not, then PIX would tell me that "This pixel was eliminated because: It failed the depth test.".

I will set up the vertex locations with the following


Position0 = -1, -1, 1
Position1 = -1, 1, 1
Position2 = 1, -1, 1
Position3 = 1, 1, 1

I will create the indices this way

index[0] = 0; index[1] = 1; index[2] = 2;
index[3] = 0; index[4] = 2; index[5] = 3;

When I take a look in PIX, and take a look at the Details -> Mesh panel for DrawIndexed I will see the correct values (well, the ones I posted above there. For example, VTX/IDX 0 will be (-1, -1, 1, 1). What I do not see for some strange reason is the DrawIndexed call vertex shader debugging, UNLESS I click on a specific part of the Render, even though all I see is the cleared render target color. For example, if I try to debug the pixel (161, 161) I will see the DrawIndexed primitive event, however, there will be a message telling me that "This pixel was eliminated because: It failed the depth test.". The interesting part to that, is I disable the depth test in the depth stencil state the gets set.

The shader code is simple, I just take the input and send it back out. When I go to render, it is very basic, the steps are like this.


ClearRenderTargetView(...)
ClearDepthStencilView(view, D3D11_CLEAR_DEPTH, 1.0f, 0)

SetVSShader()
SetPSShader()

// FullScreenQuad rendering code
SetInputLayoutToRender(..)
SetVertexBuffers(..)
SetIndexBuffer(...)
DrawIndexedPrimitive(6, 0, 0)

SwapChain->Present(..)


Does anyone know what could be going on here?

Depth stencil state code

D3D11_DEPTH_STENCIL_DESC depthStencilDesc;

// Initialize the description of the stencil state.
ZeroMemory(&depthStencilDesc, sizeof(depthStencilDesc));

// Set up the description of the stencil state.
depthStencilDesc.DepthEnable = false;
depthStencilDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
depthStencilDesc.DepthFunc = D3D11_COMPARISON_LESS;

depthStencilDesc.StencilEnable = false;
depthStencilDesc.StencilReadMask = 0xFF;
depthStencilDesc.StencilWriteMask = 0xFF;

// Stencil operations if pixel is front-facing.
depthStencilDesc.FrontFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
depthStencilDesc.FrontFace.StencilDepthFailOp = D3D11_STENCIL_OP_INCR;
depthStencilDesc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
depthStencilDesc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;

// Stencil operations if pixel is back-facing.
depthStencilDesc.BackFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
depthStencilDesc.BackFace.StencilDepthFailOp = D3D11_STENCIL_OP_DECR;
depthStencilDesc.BackFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
depthStencilDesc.BackFace.StencilFunc = D3D11_COMPARISON_ALWAYS;

hr = m_pD3D11Device->CreateDepthStencilState(&depthStencilDesc, &m_depthStencilState);



Shader code

struct VertexShaderInput
{
float4 Position : POSITION;
};

struct VertexShaderOutput
{
float4 Position : SV_POSITION;
};

VertexShaderOutput VS(VertexShaderInput input)
{
VertexShaderOutput output;
output.Position = input.Position;
return output;
}

float4 PS(VertexShaderOutput input) : SV_Target
{
return float4(0.0f, 0.0f, 0.0f, 1.0f);
}



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Unfortunately it seems as if it may be something more than that. I tried changing my indices to that and I still get the same result.

I tried to look on msdn but I could not find anything I was doing wrong to get "This pixel was eliminated because: It failed the depth test.". Has anyone experienced this before?

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If you view the device details in PIX and check under Output Merger you can see the depth stencil state. Double-check there so there's nothing strange going on. Also click on your Draw call and check the Mesh tab, to see if there is actually any geometry in the viewport.

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When I have my indices set to


index[0] = 0; index[1] = 1; index[2] = 2;
index[3] = 0; index[4] = 2; index[5] = 3;

Which is wrong, I will see a broken rectangle in the Mesh window, when I set my indicies to the following, I will see nothing in my mesh window.

m_pIndices[0] = 1; m_pIndices[1] = 3; m_pIndices[2] = 2;
m_pIndices[3] = 1; m_pIndices[4] = 0; m_pIndices[5] = 2;

For direct comparison, I debug pixel 161.

Where is the "Output Merger" window in PIX? I have never used it before ...

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View details for your device context, just like you view a shader or texture. If you view your mesh or the rendered image, then object addresses in the Frame list should appear blue. Double-click them to view details for them. So if you double-click the device context used in the draw you get many new tabs for it, and one of them is the Output Merger tab.

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Ah, that helped out an incredible amount, I had no idea I could access the information like that.

It turns out that I was creating the state with DepthEnable = false, but never actually setting it to the device.

Everything is working now, for reference to anyone that reads this thread, the complete indices are the following

m_pIndices[0] = 1; m_pIndices[1] = 3; m_pIndices[2] = 2;
m_pIndices[3] = 2; m_pIndices[4] = 0; m_pIndices[5] = 1;

Thank you for the help

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