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Member Since 22 Nov 2011
Offline Last Active Dec 02 2014 05:15 AM

Topics I've Started

Why is a result different with output value in hlsl?

30 November 2014 - 09:17 PM

I am trying to debug but there is a problem with output value. The problem is the result I got is different with output value. For instance, the output value is float4(0.75, 0.5, 0, 1), so the result must be (191, 128, 0, 1), but the result is (225, 188, 0, 1). Is there anybody experienced this problem? Please help me.

Rotate around model's axes

14 May 2014 - 11:55 PM

I want to rotate around model's y-axis, but I do not know how to do it. There is a same topic but I do not completely understand and it is closed. There is a function name D3DXMatrixRotationAxis in DX, but the problem is how to set the vector value, to rotate around, after loading a model.

Cannot save values into fragment using unordered access view buffer

27 March 2014 - 08:22 AM

I am trying to modify a value before saving a fragment into an UAV but it does not work.


HLSL source code

struct FragmentData
     uint ID;

struct FragmentLink
     FragmentData Data;
     uint nNext;

float4 PS(ScenePS_Input input) : SV_TARGET
     uint x = input.Position.x;        // [0,g_nFrameWidth]
     uint y = input.Position.y;        // [0,g_nFrameHeight]

     // Create fragment data.
     FragmentLink element;
     element.fragmentData.ID = 5;

     // Increment and get current pixel count.
    uint nPixelCount= FLBuffer.IncrementCounter();

    // Read and update Start Offset Buffer.
    uint nIndex = y * g_nFrameWidth + x;
    uint nStartOffsetAddress = 4 * nIndex;
    uint nOldStartOffset;
        nStartOffsetAddress, nPixelCount, nOldStartOffset );

    // Store fragment link.
    element.nNext = nOldStartOffset;
    FLBuffer[ nPixelCount ] = element;

    return float4(1.0f, 0.0f, 0.0f, 1.0f);

In main source code, 

        HRESULT hr;
        ID3D11Buffer* pDebugBuf = CreateAndCopyToDebugBuf( pDevice, pD3DContext, pFragmentLink );
        D3D11_MAPPED_SUBRESOURCE MappedResource;     
        V( pD3DContext->Map( pDebugBuf, 0, D3D11_MAP_READ, 0, &MappedResource ) );
        FragmentLink* pData = reinterpret_cast< FragmentLink* >( MappedResource.pData );
        int nSize = pBackBufferDesc->Width * pBackBufferDesc->Height * 8;
        for( int i=0; i<nSize; ++i ) 	
            FragmentLink data = pData[ i ];
            if( data.nNext == 0xFFFFFFFF ) {
                int nBreak = 0;
	        if (data.fragmentData.ID != 5)				
		    int a = 1;
        pD3DContext->Unmap( pDebugBuf, 0 );
        SAFE_RELEASE( pDebugBuf ); 

there are some fragments' ID are 0, the rest are 5. I do not understand the reason why fragments' ID are 0. Is there anybody experience this problem before? Help me, please. Thanks.

Problem with mapping a constant buffer resource

16 March 2014 - 09:12 PM

I am implementing for my paper. However, there is a vague problem which I do not know exact reason. As debugging, the windows is frozen for a while, then goes black and it stops at code which mapping a constant buffer. The constant buffer is not null, but it is data is null after mapping.

        D3D11_MAPPED_SUBRESOURCE MappedResource3;  
	HR( gpImmediateContext->Map( mCBPS_ID, 0, D3D11_MAP_WRITE_DISCARD, 0, &MappedResource3 ) );
	PS_CB_ID* pPSID = ( PS_CB_ID* )MappedResource3.pData;

	char DebugString[100];
	sprintf_s(DebugString,"ID_constant buffer is: %p\n", mCBPS_ID);
	pPSID->g_iID = 0; // pPSID is null

	gpImmediateContext->Unmap( mCBPS_ID, 0 );	    
	gpImmediateContext->PSSetConstantBuffers( 3, 1, &mCBPS_ID );

Have anybody experienced this problem before? Please, help me. Thanks in advanced

Is there possible to use dynamic index in shader model 5.0?

14 November 2013 - 08:33 PM

I have an array of textures in the shader such as Texture2D pTextures[30], and I want to use a dynamic index instead of a specified index. Is there possible to do such thing? and how to do it?.


For example:


Use pTextures[ID] with ID is computed at runtime, instead of pTextures[x] with x is a specified value.