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Anand Baumunk

Dynamic Vertexbuffer

4 posts in this topic

Simple thing this time: I want to create a dynamic vertexbuffer, and refill it multiple times per frame with ->Map.
I don't get any kind of errormessage, it's just that nothing gets drawn. I checked everything in the compiler, I couldn't see whats wrong.

ZeroMemory( &vertexBufferDesc, sizeof(vertexBufferDesc) );
vertexBufferDesc.Usage = D3D11_USAGE_DYNAMIC;
vertexBufferDesc.ByteWidth = sizeof(VertexPosNormalTexColorColor2) * (numVertices);
vertexBufferDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
vertexBufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
vertexBufferDesc.MiscFlags = 0;

d3d11Device->CreateBuffer( &vertexBufferDesc, NULL, &vertexBufferIn);

//And the filling:
VertexPosNormalTexColorColor2 *dataPtr;
d3d11DevCon->Map(vBufferIn, 0, D3D11_MAP_WRITE_DISCARD, 0, &subresource );
dataPtr = (VertexPosNormalTexColorColor2*)subresource.pData;
dataPtr->pos = verts->pos;
dataPtr->normal = verts->normal;
dataPtr->texcoord = verts->texcoord;
dataPtr->color = verts->color;
dataPtr->shadowColor = verts->shadowColor;
d3d11DevCon->Unmap(vBufferIn, 0);

// drawing:
d3d11DevCon->UpdateSubresource(cBufferIn, 0, NULL, &cBufferSet, 0, 0);
d3d11DevCon->IASetIndexBuffer( iBufferIn, DXGI_FORMAT_R32_UINT, 0);
d3d11DevCon->IASetVertexBuffers( 0, 1, &vBuffer, &stride, &offset );
d3d11DevCon->DrawIndexed(numIndices, 0, 0 );

Thanks for your help! Edited by gnomgrol

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The code you posted looks ok. If you haven't already, make sure that you create the device with the DEBUG flag. You can also check the return value of Map to make sure that it succeeds.

After that, I would inspect the draw call with PIX which will show you the contents of the vertex buffer.

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DEBUG flag is activated and Map returns S_OK.

Problem with PIX was my own fault. For some reason the heightmap I tried to load was wrong sized since it was the one in the debugfolder I had not updated.
I'll see what I can get out of it in PIX now. Edited by gnomgrol

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Done. PIX showed me two things:
a.) after ->map-ing the vertexbuffer, there are only 3 vertices set in it! The rest is 0.
b.) the indexbuffer is completly 0, but that is also the case when I load a working version of the app. So this should not be the reason.

EDIT: got it. I need to fill the vertexbuffer with:
VertexPosNormalTexColorColor2 *dataPtr2;
D3D11_MAPPED_SUBRESOURCE subresource2;
d3d11DevCon->Map(vBufferIn, 0, D3D11_MAP_WRITE_DISCARD, 0, &subresource2 );
dataPtr2 = (VertexPosNormalTexColorColor2 *)subresource2.pData;
for(int i=0;i<chunkVnum;i++){
dataPtr2[i] = verts[i];
d3d11DevCon->Unmap(vBufferIn, 0);
[/CODE] Edited by gnomgrol

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