Problem with ConstructGSWithSO (D3DX11 Effect)

Graphics and GPU Programming Programming DX11

Started by B_old October 15, 2011 07:10 PM

5 comments, last by B_old 12 years, 6 months ago

B_old

689

Author

October 15, 2011 07:10 PM

I'm trying to stream out vertex data to two streams from a geometry shader that looks like this:





cbuffer ChangePerSkinnedObject

{

	float4x4 g_bones[256];

}





struct SkinnedVertex

{

	float3 pos    : Position;

	float4 normal : Normal;

};





SkinnedVertex skin(float3 pos, float4 weights, uint4 bones, float4 normal)

{

	SkinnedVertex output = (SkinnedVertex)0;



        //skinning...



	return output;

}





SkinnedVertex vertexShader(float3 pos : Position, float4 weights : Weights, uint4 bones : Bones, float4 normal : Normal)

{

	return skin(pos, weights, bones, normal);

}





VertexShader VShader   = CompileShader(vs_5_0, vertexShader());





GeometryShader GeoShaderSo = ConstructGSWithSO(VShader, "0:Position.xyz", "1:Normal.xyzw", NULL, NULL, 0);





technique11 Skinning

{

	pass P0

	{      

		SetVertexShader(VShader);

		SetGeometryShader(GeoShaderSo);

		SetPixelShader(0);

	}

}

When I compile the effect file I get the following error: D3D11: ERROR: ID3D11Device::CreateGeometryShaderWithStreamOutput: Stream Output Declaration Element[1]'s semantic (Normal 0) not found in output signature of shader.
I don't understand it.
Setting the declaration for the second stream to NULL makes it compile. It even works but obviously the second stream does not receive the data I want to have.
Any idea how to configure ConstructGSWithSO() correctly?

unbird

8,359

October 16, 2011 11:40 AM

Funnily, I can compile that shader with fxc without any problems. Haven't played around with multiple streams yet, but if I get the effect file syntax right from here, maybe this works:



  GeometryShader GeoShaderSo = ConstructGSWithSO(VShader, "0:Position.xyz;1:Normal.xyzw", NULL, NULL, NULL, 0);

since you don't have an explicit GS which outputs a second stream.

B_old

689

Author

October 16, 2011 02:23 PM

As you say, I don't get a compile error but the error appears later when the effect framework calls CreateGSWithSO(). The variant suggested by you works but than I end up with an interleaved stream, which I don't want.
I tried this:





//...

struct GS_Output_Pos

{

	float3 pos : Position;

};



struct GS_Output_Normal

{

	float4 normal : Normal;

};



[maxvertexcount(1)]

void geometryShader(point SkinnedVertex input[1], inout PointStream<GS_Output_Pos> positions, inout PointStream<GS_Output_Normal> normals)

{

	GS_Output_Pos pos;

	pos.pos = input[0].pos;



	GS_Output_Normal normal;

	normal.normal = input[0].normal;



	positions.Append(pos);

	normals.Append(normal);

}



VertexShader VShader   = CompileShader(vs_5_0, vertexShader());



GeometryShader GsBase = CompileShader(gs_5_0, geometryShader());

GeometryShader GeoShaderSo = ConstructGSWithSO(GsBase, "0:Position.xyz", "1:Normal.xyzw", NULL, NULL, 0xffffffff);

It doesn't give me any errors but it crashes the video driver.

BTW, do you happen to know what the fx equivalent of D3D11_SO_NO_RASTERIZED_STREAM is? I tried 0xffffffff, but this still gives me a warning that the rasterizer is activated unless I manually disable depth-writes.

unbird

8,359

October 16, 2011 02:47 PM

I'm currently out of clues. Can you show the buffer creation, draw setup and drawing call code, please ?

B_old

689

Author

October 16, 2011 03:11 PM



//buffer creation

D3D11_BUFFER_DESC bd;

bd.Usage = D3D11_USAGE_DEFAULT;

bd.ByteWidth = bytes;

bd.BindFlags = D3D11_BIND_STREAM_OUTPUT | D3D11_BIND_VERTEX_BUFFER;

bd.CPUAccessFlags = 0;

bd.MiscFlags = 0;



ID3D11Buffer *buffer;



m_device->CreateBuffer(&bd, nullptr, &buffer);



//drawing

getContext().setRenderTarget(nullptr, nullptr); 

getContext().unbindVertexBuffers(); 

getContext().setDepthStencilState(&m_dsState); 

getContext().setPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_POINTLIST); 

getContext().setInputLayout(m_inputLayout);



m_effect->setMatrices("g_bones", skeleton->getBones(), skeleton->getNumBones()); 

getContext().setVertexBuffers(2, skinningData->m_skinningInputs, inputLayoutDescription()); 

getContext().setStreamOutTargets(2, skinningData->m_streamOutTargets); 

m_effect->getTechnique("Skinning").apply(getContext()); 

getContext().draw(getModel()->m_numVertices);

The second part is pseudo code:ish but I hope you can still see the d3d11 calls beneath it. As I said earlier that stuff actually works as long as I only write to one stream, but I'd rather have two.

unbird

8,359

October 16, 2011 04:00 PM

Hot stuff, literally. Experimenting with your setup - manually though, not through the effect framework - I first got a memory corruption when calling CreateGeometryShaderWithStreamOutput and later a freeze of my apps and suddenly some weird rendering with a blue background and white text. Blue screen of death

So I'm of little help now, sorry. I'd double check the strides and experiment with buffers with equal strides. But that's just a real shot in the dark.

B_old

689

Author

October 16, 2011 05:20 PM

I managed to get away the errors by specifying [font="Courier New"]uint normal : Normal[/font] as the output for the second stream which matches the stride of my normals, because they are compressed. However whatever I output in the geometry shader it does not seem to end up in the output stream.

EDIT0: I confirmed that the second stream is not being written too, by outputting the same data to both streams. Reading from those streams later the data is not identical.

EDIT1: Had to specify [maxvertexcount(2)]. Now it works!

Problem with ConstructGSWithSO (D3DX11 Effect)

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