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);

Answer 1

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...

Answer 2

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.

Answer 3

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