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PODirect3D11(C++): Updating Texture coordinates in constant buffer?
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2011-09-08T20:21:07.817
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I'm trying to make a rather basic 2D Engine with Direct3D. I made a LoadImage() function which stores all the rather static behaviour of the image in an object. (Shaders, Vertexbuffers, Samplers etc) I am planning to do the positioning of the vertices with matrices in constant buffers. However, I would also like to have a DrawImage() function, which would have a parameter to tell what part of the texture should be drawn (clipped), so I would have to update the texture coordinates. Since the vertexbuffer is already pre-defined, I wondered if there is a way to update texture coordinates via a constantbuffer that would be sent to the vertexshader? I hope my question is clear enough, if you have any doubts look at the code below. <pre><code>bool GameManager::GMLoadImage(Image* pImage, const char* pkcFilePath, ImageDesc* pImDesc) { pImage = new Image(); ID3D11ShaderResourceView* pColorMap = (pImage)->GetpColorMap(); /// CREATE SHADER RESOURCE VIEW (from file) /// HRESULT result = D3DX11CreateShaderResourceViewFromFileA(m_pDevice, pkcFilePath, 0, 0, &pColorMap, 0); if (FAILED(result)) { MessageBoxA(NULL,"Error loading ShaderResourceView from file","Error",MB_OK); return false; } /// RECEIVE TEXTURE DESC /// ID3D11Resource* pColorTex; pColorMap->GetResource(&pColorTex); ((ID3D11Texture2D*)pColorTex)->GetDesc(&((pImage)->GetColorTexDesc())); pColorTex->Release(); /// CREATE VERTEX BUFFER /// D3D11_TEXTURE2D_DESC colorTexDesc = pImage->GetColorTexDesc(); float halfWidth = static_cast<float>(colorTexDesc.Width)/2.0f; float halfHeight = static_cast<float>(colorTexDesc.Height)/2.0f; Vertex.PosTex vertices[]= { {XMFLOAT3( halfWidth, halfHeight, 1.0f ), XMFLOAT2( 1.0f, 0.0f )}, {XMFLOAT3( halfWidth, -halfHeight, 1.0f ), XMFLOAT2( 1.0f, 1.0f )}, {XMFLOAT3( -halfWidth, -halfHeight, 1.0f ), XMFLOAT2( 0.0f, 1.0f )}, {XMFLOAT3( -halfWidth, -halfHeight, 1.0f ), XMFLOAT2( 0.0f, 1.0f )}, {XMFLOAT3( -halfWidth, halfHeight, 1.0f ), XMFLOAT2( 0.0f, 0.0f )}, {XMFLOAT3( halfWidth, halfHeight, 1.0f ), XMFLOAT2( 1.0f, 0.0f )} }; D3D11_BUFFER_DESC vertexDesc; ZeroMemory(&vertexDesc,sizeof(vertexDesc)); vertexDesc.Usage = D3D11_USAGE_DEFAULT; vertexDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER; vertexDesc.ByteWidth = sizeof(Vertex.PosTex)*6; D3D11_SUBRESOURCE_DATA resourceData; resourceData.pSysMem = vertices; ID3D11Buffer* pVBuffer = pImage->GetpVertexBuffer(); result = m_pDevice->CreateBuffer(&vertexDesc,&resourceData,&pVBuffer); if (FAILED(result)) { MessageBoxA(NULL,"Error Creating VBuffer","Error",MB_OK); return false; } /// SET POINTER TO IMAGEDESC ImageDesc* pThisImDesc = pImage->GetpImageDesc(); pThisImDesc = pImDesc; return true; } bool GameManager::GMDrawImage(Image* pImage, const CLIPRECT& rkClip) { ImageDesc* thisImDesc = pImage->GetpImageDesc(); if ( (thisImDesc != m_pImDesc) ) { m_pImDesc = thisImDesc; m_pContext->IASetInputLayout(m_pImDesc->pInputLayout); m_pContext->IASetPrimitiveTopology(m_pImDesc->Topology); m_pContext->VSSetShader(m_pImDesc->pSolidColorVS,0,0); m_pContext->PSSetShader(m_pImDesc->pSolidColorPS,0,0); m_pContext->PSSetSamplers(0,1,&m_pImDesc->pSampler); m_pContext->OMSetBlendState(m_pImDesc->pBlendState,NULL,0xFFFFFFFF); } UINT stride = m_pImDesc->VertexSize; UINT offset = 0; ID3D11Buffer* pVBuffer = pImage->GetpVertexBuffer(); ID3D11ShaderResourceView* pColorMap = pImage->GetpColorMap(); m_pContext->IASetVertexBuffers(0,1,&pVBuffer,&stride,&offset); m_pContext->PSSetShaderResources(0,1,&pColorMap); //set constant buffers? m_pContext->Draw(6,0); } </code></pre>
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<c++><directx><rendering><direct3d><direct3d11>
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Direct3D11(C++): Updating Texture coordinates in constant buffer?
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