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problem with SRV when I using ID3D11Texture2d with NV12_FORMAT

    Question

  • Hi!

    I use a texture2D with NV12 format:

    D3D11_TEXTURE2D_DESC desc;
    	ZeroMemory( &desc, sizeof(desc) );
    	desc.Width = 1920;
    	desc.Height = 1088;
    	desc.MipLevels = 1;
    	desc.ArraySize = 1;
    	desc.Format = DXGI_FORMAT_NV12;
    	desc.SampleDesc.Count = 1;
    	desc.Usage = D3D11_USAGE_DEFAULT;
    	desc.BindFlags =  D3D11_BIND_SHADER_RESOURCE;
    	pRenderTarget = NULL;
    	m_pD3D11Device->CreateTexture2D( &desc, NULL, &pRenderTarget );

    And i create two shader ressource view with format R8_UNORM and R8G8_UNORM :

    D3D11_SHADER_RESOURCE_VIEW_DESC	srvDesc;
    	srvDesc.Format=DXGI_FORMAT_R8_UNORM;
    	srvDesc.ViewDimension=D3D11_SRV_DIMENSION_TEXTURE2D;
    	srvDesc.Texture2DArray.MostDetailedMip=0;
    	srvDesc.Texture2DArray.MipLevels=1;
    	m_pD3D11Device->CreateShaderResourceView(pRenderTarget,&srvDesc,&m_textureRV);
    	srvDesc.Format=DXGI_FORMAT_R8G8_UNORM;
    	m_pD3D11Device->CreateShaderResourceView(pRenderTarget,&srvDesc,&m_textureRV1);

    But i dont know display  luminance and chrominance. My hlsl file :

    Texture2D colorMap_ : register( t0 );
    Texture2D colorMap1_ : register( t1 );
    SamplerState colorSampler_ : register( s0 );
    
    
    struct VS_Input
    {
        float4 pos   : POSITION;
        float2 tex0 : TEXCOORD0;
    };
    
    struct PS_Input
    {
        float4 pos   : SV_POSITION;
        float2 tex0 : TEXCOORD0;
    };
    
    
    PS_Input VS_Main( VS_Input vertex )
    {
        PS_Input vsOut = ( PS_Input )0;
        vsOut.pos = vertex.pos;
        vsOut.tex0 = vertex.tex0;
    
        return vsOut;
    }
    
    
    float4 PS_Main( PS_Input frag ) : SV_TARGET
    {
    	return colorMap_.Sample( colorSampler_, frag.tex0 )*colorMap1_.Sample( colorSampler_, frag.tex0);
    }

    And my instruction for the srv :

    m_pD3D11Ctx->PSSetShaderResources(0, 1, &m_textureRV);
    m_pD3D11Ctx->PSSetShaderResources(1,1, &m_textureRV1);




    • Edited by pizani1 Wednesday, May 15, 2013 1:31 PM
    Wednesday, May 15, 2013 1:30 PM

Answers

  • You just do multiple texture look-ups in the pixel shader to get the Y and UV values all at once.

    Friday, May 17, 2013 8:01 PM

All replies

  • What are you trying to display exactly?  Direct3D 11 will not directly output YUV data. Your shader has to convert it to RGB in some fashion...
    Wednesday, May 15, 2013 11:01 PM
  • Yeah I can convert it but only the chrominance and luminance.  When I see this :

    DXGI_FORMAT_NV12

    Most common YUV 4:2:0 video resource format. Valid luminance data view formats for this video resource format are DXGI_FORMAT_R8_UNORM and DXGI_FORMAT_R8_UINT. Valid chrominance data view formats (width and height are each 1/2 of luminance view) for this video resource format are DXGI_FORMAT_R8G8_UNORM and DXGI_FORMAT_R8G8_UINT. Supported view types are SRV, RTV, and UAV. For luminance data view, the mapping to the view channel is Y->R8. For chrominance data view, the mapping to the view channel is U->R8 and V->G8.

    I have chrominance and luminance with  2 shader( DXGI_FORMAT_R8_UNORM and DXGI_FORMAT_R8G8_UNORM ) but i can't find how to meet to show my image YUV. I can show separately the luminance and chrominance.




    • Edited by pizani1 Thursday, May 16, 2013 1:36 PM
    Thursday, May 16, 2013 7:06 AM
  • You just do multiple texture look-ups in the pixel shader to get the Y and UV values all at once.

    Friday, May 17, 2013 8:01 PM