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PODirectX/C++ How to Dereference Vector Data Array to Initialize D3D11 SUBRESOURCE DATA
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  1. PODirectX/C++ How to Dereference Vector Data Array to Initialize D3D11 SUBRESOURCE DATA
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    copied!<p>I am trying to pass a pointer to an array of Vertex Data, (base class member) into a method used to initialize the Direct3D Vertex Buffer, (ID3D11Buffer).</p> <p>I want to use the variable, "v4", the pointer to the array, but I think I am not dereferencing the pointer correctly. Could someone point me in the right direction?</p> <p>I have tried many ways to make this assignment, but I can only get a basic array work, (sometimes I end up with casting to "const void *" errors).</p> <p>How would I use a pointer? </p> <p>The line I am having issue with is ... vertexSubResourceData.pSysMem = v1;</p> <p>(p.s. Using the V.S. C++ Nov 2012 CTP compiler .. not released yet ..)</p> <p>*<strong>Answered: Have confirmed that it is a Visual Studio 2012 C++ Nov. CTP Compiler Bug. Arrays of Vector structures declared, even outside of the class, using C++ 11 initialization syntax are being interpreted incorrectly, (unless of course I am using the incorrect array initialization syntax). Also Note: This only pertains to initialization lists associated with pointers. *</strong></p> <p>Thanks!</p> <p>// Simplified Code</p> <pre><code>void Triangle::InitializeVertexBuffer() { struct V { float X, Y, Z; // vertex position }; // Compiles But doesn't work as desired. // changed from V* v4 = new V[] // Compiled without range. // Pointer to this data would ideally come from base static pointer, or file. V* v4 = new V[3] { { 0.50f, 0.5f, 0.0f }, { 0.50f, -0.5f, 0.0f }, { -0.50f, -0.5f, 0.0f }, }; // Compiles and Works to prove compiler issue with initialization lists. V* vectorList = new V[3]; vectorList[0].X = 0.5f; vectorList[0].Y = 0.5f; vectorList[0].Z = 0.00f; vectorList[1].X = 0.5f; vectorList[1].Y = -0.5f; vectorList[1].Z = 0.00f; vectorList[2].X = -0.5f; vectorList[2].Y = -0.5f; vectorList[2].Z = 0.00f; unsigned int size = sizeof(V) * 3; //sizeof(* Model::Vertices); // The Description of the Vertex Buffer D3D11_BUFFER_DESC vertexBufferDescription = {0}; vertexBufferDescription.ByteWidth = size; vertexBufferDescription.BindFlags = D3D11_BIND_VERTEX_BUFFER; // Model Data to be transferred to GPU Buffer. D3D11_SUBRESOURCE_DATA vertexSubResourceData = {0}; vertexSubResourceData.SysMemPitch = 0; vertexSubResourceData.SysMemSlicePitch = 0; // Can't figure out how to dereference v4 vertexSubResourceData.pSysMem = vectorList; // works, but using "v4" doesn't. // vertexSubResourceData.pSysMem = Model::Vertices; // This is what I /really/ want .. Pointer to vertice array data from base class NS::DeviceManager::Device-&gt;CreateBuffer( &amp;vertexBufferDescription, &amp;vertexSubResourceData, &amp;NS::ModelRenderer::VertexBuffer); } </code></pre>
 

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