Writing on a UAV in pixel shader - directx

Question

I was doing some experiment with textures as UAV in pixel shader by writing some value on it, but I'm not seeing its effect in the next draw call when I bind the same texture again as an SRV.
Example shader:
RWTexture2D<unsigned int> uav;
Texture2D tex : register(t0);
// Vertex Shader
float4 VS( float4 Pos : POSITION ) : SV_POSITION
{
return Pos;
}
// Pixel Shader, draw1 warm up
float4 PS( float4 Pos : SV_POSITION ) : SV_Target
{
return float4( 1.0f, 1.0f, 0.0f, 1.0f ); // Yellow, with Alpha = 1
}
// Pixel Shader, we are writing onto the texture by binding it as an UAV, draw2
float4 PS1( float4 Pos : SV_POSITION ) : SV_Target
{
if((Pos.x %2) && (Pos.y %2))
{
uav[Pos.xy]=0xFF000000; //some color
}
else
{
uav[Pos.xy]=0x00FF0000; //some color
}
return float4( 1.0f, 0.0f, 0.0f, 1.0f );
}
// Pixel Shader, here we are accessing texture as an SRV, draw3
float4 PS2( float4 Pos : SV_POSITION ) : SV_Target
{
float4 x = tex[Pos.xy];
return x;
}
I can provide the app source code if required.

Answer 1

I enabled the debug layer. It was UAV format mismatch error. In the UAV description, I declared R8G8B8A8_UNORM as a format and I'm accessing the element as UINT in the shader.
description: D3D11 ERROR: ID3D11DeviceContext::Draw: The resource return type for component 0 declared in the shader code (UINT) is not compatible with the resource type bound to Unordered Access View slot 1 of the Pixel Shader unit (UNORM). This mismatch is invalid if the shader actually uses the view [ EXECUTION ERROR #2097372: DEVICE_UNORDEREDACCESSVIEW_RETURN_TYPE_MISMATCH]
Source code:
D3D11_UNORDERED_ACCESS_VIEW_DESC UAVdesc;
ZeroMemory( &SRVdesc, sizeof(SRVdesc));
UAVdesc.Format=DXGI_FORMAT_R8G8B8A8_UNORM;
UAVdesc.ViewDimension=D3D11_UAV_DIMENSION_TEXTURE2D;
UAVdesc.Texture2D.MipSlice=0;
g_pd3dDevice->CreateUnorderedAccessView( g_pTexture, &UAVdesc, &g_pUAV);
Texture created :
D3D11_TEXTURE2D_DESC TextureData;
ZeroMemory( &TextureData, sizeof(TextureData) );
TextureData.ArraySize=1;
TextureData.Height=height;
TextureData.Width=width;
TextureData.Format=DXGI_FORMAT_R8G8B8A8_TYPELESS;
TextureData.CPUAccessFlags=0;
TextureData.BindFlags=D3D11_BIND_SHADER_RESOURCE|D3D11_BIND_RENDER_TARGET|D3D11_BIND_UNORDERED_ACCESS;
TextureData.MipLevels=1;
TextureData.MiscFlags=0;
TextureData.SampleDesc.Count=1;
TextureData.SampleDesc.Quality=0;
TextureData.Usage=D3D11_USAGE_DEFAULT;
D3D11_SUBRESOURCE_DATA InitialData;
ZeroMemory( &InitialData, sizeof(InitialData));
InitialData.pSysMem=pData;
InitialData.SysMemPitch=width * sizeof(UINT);
InitialData.SysMemSlicePitch=width * sizeof(UINT) * height;
g_pd3dDevice->CreateTexture2D( &TextureData, &InitialData, &g_pTexture);
Shader code is already given above.
Fix:
D3D11_UNORDERED_ACCESS_VIEW_DESC UAVdesc;
ZeroMemory( &SRVdesc, sizeof(SRVdesc));
**UAVdesc.Format=DXGI_FORMAT_R32_UINT;**
UAVdesc.ViewDimension=D3D11_UAV_DIMENSION_TEXTURE2D;
UAVdesc.Texture2D.MipSlice=0;
g_pd3dDevice->CreateUnorderedAccessView( g_pTexture, &UAVdesc, &g_pUAV);
confirmed by dumping texture in staging resource. Thanks guys.