We are using Direct3D 11 with C++ to complete this. We are to draw the shape bel

Question

We are using Direct3D 11 with C++ to complete this. We are to draw the shape below, but we currently have only a triangle drawn. Please help me edit the the code in SimpleVertex to draw this. We were told that there is a way to create this by doing a for loop using trig functions (sin and cos) and also using the radius of the circle.

If you want to see the full code that we used it is from the DirectX Sample Browser (June 2010) Direct3D 11 Tutorial 02: Rendering a Triangle. If you have DirectX installed you should be able to find the full code on your computer. However, I have provided the code below and bolded what I think needs to be changed:

Explanation / Answer

#include #include #include #include #include #include "resource.h" //-------------------------------------------------------------------------------------- // Structures //-------------------------------------------------------------------------------------- struct SimpleVertex { XMFLOAT3 Pos; }; //-------------------------------------------------------------------------------------- // Global Variables //-------------------------------------------------------------------------------------- HINSTANCE g_hInst = NULL; HWND g_hWnd = NULL; D3D_DRIVER_TYPE g_driverType = D3D_DRIVER_TYPE_NULL; D3D_FEATURE_LEVEL g_featureLevel = D3D_FEATURE_LEVEL_11_0; ID3D11Device* g_pd3dDevice = NULL; ID3D11DeviceContext* g_pImmediateContext = NULL; IDXGISwapChain* g_pSwapChain = NULL; ID3D11RenderTargetView* g_pRenderTargetView = NULL; ID3D11VertexShader* g_pVertexShader = NULL; ID3D11PixelShader* g_pPixelShader = NULL; ID3D11InputLayout* g_pVertexLayout = NULL; ID3D11Buffer* g_pVertexBuffer = NULL; //-------------------------------------------------------------------------------------- // Forward declarations //-------------------------------------------------------------------------------------- HRESULT InitWindow( HINSTANCE hInstance, int nCmdShow ); HRESULT InitDevice(); void CleanupDevice(); LRESULT CALLBACK WndProc( HWND, UINT, WPARAM, LPARAM ); void Render(); //-------------------------------------------------------------------------------------- // Entry point to the program. Initializes everything and goes into a message processing // loop. Idle time is used to render the scene. //-------------------------------------------------------------------------------------- int WINAPI wWinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow ) { UNREFERENCED_PARAMETER( hPrevInstance ); UNREFERENCED_PARAMETER( lpCmdLine ); if( FAILED( InitWindow( hInstance, nCmdShow ) ) ) return 0; if( FAILED( InitDevice() ) ) { CleanupDevice(); return 0; } // Main message loop MSG msg = {0}; while( WM_QUIT != msg.message ) { if( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) ) { TranslateMessage( &msg ); DispatchMessage( &msg ); } else { Render(); } } CleanupDevice(); return ( int )msg.wParam; } //-------------------------------------------------------------------------------------- // Register class and create window //-------------------------------------------------------------------------------------- HRESULT InitWindow( HINSTANCE hInstance, int nCmdShow ) { // Register class WNDCLASSEX wcex; wcex.cbSize = sizeof( WNDCLASSEX ); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon( hInstance, ( LPCTSTR )IDI_TUTORIAL1 ); wcex.hCursor = LoadCursor( NULL, IDC_ARROW ); wcex.hbrBackground = ( HBRUSH )( COLOR_WINDOW + 1 ); wcex.lpszMenuName = NULL; wcex.lpszClassName = L"TutorialWindowClass"; wcex.hIconSm = LoadIcon( wcex.hInstance, ( LPCTSTR )IDI_TUTORIAL1 ); if( !RegisterClassEx( &wcex ) ) return E_FAIL; // Create window g_hInst = hInstance; RECT rc = { 0, 0, 640, 480 }; AdjustWindowRect( &rc, WS_OVERLAPPEDWINDOW, FALSE ); g_hWnd = CreateWindow( L"TutorialWindowClass", L"Direct3D 11 Tutorial 2: Rendering a Triangle", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, rc.right - rc.left, rc.bottom - rc.top, NULL, NULL, hInstance, NULL ); if( !g_hWnd ) return E_FAIL; ShowWindow( g_hWnd, nCmdShow ); return S_OK; } //-------------------------------------------------------------------------------------- // Helper for compiling shaders with D3DX11 //-------------------------------------------------------------------------------------- HRESULT CompileShaderFromFile( WCHAR* szFileName, LPCSTR szEntryPoint, LPCSTR szShaderModel, ID3DBlob** ppBlobOut ) { HRESULT hr = S_OK; DWORD dwShaderFlags = D3DCOMPILE_ENABLE_STRICTNESS; #if defined( DEBUG ) || defined( _DEBUG ) // Set the D3DCOMPILE_DEBUG flag to embed debug information in the shaders. // Setting this flag improves the shader debugging experience, but still allows // the shaders to be optimized and to run exactly the way they will run in // the release configuration of this program. dwShaderFlags |= D3DCOMPILE_DEBUG; #endif ID3DBlob* pErrorBlob; hr = D3DX11CompileFromFile( szFileName, NULL, NULL, szEntryPoint, szShaderModel, dwShaderFlags, 0, NULL, ppBlobOut, &pErrorBlob, NULL ); if( FAILED(hr) ) { if( pErrorBlob != NULL ) OutputDebugStringA( (char*)pErrorBlob->GetBufferPointer() ); if( pErrorBlob ) pErrorBlob->Release(); return hr; } if( pErrorBlob ) pErrorBlob->Release(); return S_OK; } //-------------------------------------------------------------------------------------- // Create Direct3D device and swap chain //-------------------------------------------------------------------------------------- HRESULT InitDevice() { HRESULT hr = S_OK; RECT rc; GetClientRect( g_hWnd, &rc ); UINT width = rc.right - rc.left; UINT height = rc.bottom - rc.top; UINT createDeviceFlags = 0; #ifdef _DEBUG createDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG; #endif D3D_DRIVER_TYPE driverTypes[] = { D3D_DRIVER_TYPE_HARDWARE, D3D_DRIVER_TYPE_WARP, D3D_DRIVER_TYPE_REFERENCE, }; UINT numDriverTypes = ARRAYSIZE( driverTypes ); D3D_FEATURE_LEVEL featureLevels[] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_1, D3D_FEATURE_LEVEL_10_0, }; UINT numFeatureLevels = ARRAYSIZE( featureLevels ); DXGI_SWAP_CHAIN_DESC sd; ZeroMemory( &sd, sizeof( sd ) ); sd.BufferCount = 1; sd.BufferDesc.Width = width; sd.BufferDesc.Height = height; sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM; sd.BufferDesc.RefreshRate.Numerator = 60; sd.BufferDesc.RefreshRate.Denominator = 1; sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT; sd.OutputWindow = g_hWnd; sd.SampleDesc.Count = 1; sd.SampleDesc.Quality = 0; sd.Windowed = TRUE; for( UINT driverTypeIndex = 0; driverTypeIndex GetBuffer( 0, __uuidof( ID3D11Texture2D ), ( LPVOID* )&pBackBuffer ); if( FAILED( hr ) ) return hr; hr = g_pd3dDevice->CreateRenderTargetView( pBackBuffer, NULL, &g_pRenderTargetView ); pBackBuffer->Release(); if( FAILED( hr ) ) return hr; g_pImmediateContext->OMSetRenderTargets( 1, &g_pRenderTargetView, NULL ); // Setup the viewport D3D11_VIEWPORT vp; vp.Width = (FLOAT)width; vp.Height = (FLOAT)height; vp.MinDepth = 0.0f; vp.MaxDepth = 1.0f; vp.TopLeftX = 0; vp.TopLeftY = 0; g_pImmediateContext->RSSetViewports( 1, &vp ); // Compile the vertex shader ID3DBlob* pVSBlob = NULL; hr = CompileShaderFromFile( L"Tutorial02.fx", "VS", "vs_4_0", &pVSBlob ); if( FAILED( hr ) ) { MessageBox( NULL, L"The FX file cannot be compiled. Please run this executable from the directory that contains the FX file.", L"Error", MB_OK ); return hr; } // Create the vertex shader hr = g_pd3dDevice->CreateVertexShader( pVSBlob->GetBufferPointer(), pVSBlob->GetBufferSize(), NULL, &g_pVertexShader ); if( FAILED( hr ) ) { pVSBlob->Release(); return hr; } // Define the input layout D3D11_INPUT_ELEMENT_DESC layout[] = { { "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 }, }; UINT numElements = ARRAYSIZE( layout ); // Create the input layout hr = g_pd3dDevice->CreateInputLayout( layout, numElements, pVSBlob->GetBufferPointer(), pVSBlob->GetBufferSize(), &g_pVertexLayout ); pVSBlob->Release(); if( FAILED( hr ) ) return hr; // Set the input layout g_pImmediateContext->IASetInputLayout( g_pVertexLayout ); // Compile the pixel shader ID3DBlob* pPSBlob = NULL; hr = CompileShaderFromFile( L"Tutorial02.fx", "PS", "ps_4_0", &pPSBlob ); if( FAILED( hr ) ) { MessageBox( NULL, L"The FX file cannot be compiled. Please run this executable from the directory that contains the FX file.", L"Error", MB_OK ); return hr; } // Create the pixel shader hr = g_pd3dDevice->CreatePixelShader( pPSBlob->GetBufferPointer(), pPSBlob->GetBufferSize(), NULL, &g_pPixelShader ); pPSBlob->Release(); if( FAILED( hr ) ) return hr; // Create vertex buffer SimpleVertex vertices[] = { XMFLOAT3(-0.1f, 0.8f, 0.5f), XMFLOAT3(0.1f, 0.8f, 0.5f), XMFLOAT3(0.0f, 0.0f, 0.5f), }; D3D11_BUFFER_DESC bd; ZeroMemory( &bd, sizeof(bd) ); bd.Usage = D3D11_USAGE_DEFAULT; bd.ByteWidth = sizeof( SimpleVertex ) * 3; bd.BindFlags = D3D11_BIND_VERTEX_BUFFER; bd.CPUAccessFlags = 0; D3D11_SUBRESOURCE_DATA InitData; ZeroMemory( &InitData, sizeof(InitData) ); InitData.pSysMem = vertices; hr = g_pd3dDevice->CreateBuffer( &bd, &InitData, &g_pVertexBuffer ); if( FAILED( hr ) ) return hr; // Set vertex buffer UINT stride = sizeof( SimpleVertex ); UINT offset = 0; g_pImmediateContext->IASetVertexBuffers( 0, 1, &g_pVertexBuffer, &stride, &offset ); // Set primitive topology g_pImmediateContext->IASetPrimitiveTopology( D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST ); return S_OK; } //-------------------------------------------------------------------------------------- // Clean up the objects we've created //-------------------------------------------------------------------------------------- void CleanupDevice() { if( g_pImmediateContext ) g_pImmediateContext->ClearState(); if( g_pVertexBuffer ) g_pVertexBuffer->Release(); if( g_pVertexLayout ) g_pVertexLayout->Release(); if( g_pVertexShader ) g_pVertexShader->Release(); if( g_pPixelShader ) g_pPixelShader->Release(); if( g_pRenderTargetView ) g_pRenderTargetView->Release(); if( g_pSwapChain ) g_pSwapChain->Release(); if( g_pImmediateContext ) g_pImmediateContext->Release(); if( g_pd3dDevice ) g_pd3dDevice->Release(); } //-------------------------------------------------------------------------------------- // Called every time the application receives a message //-------------------------------------------------------------------------------------- LRESULT CALLBACK WndProc( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam ) { PAINTSTRUCT ps; HDC hdc; switch( message ) { case WM_PAINT: hdc = BeginPaint( hWnd, &ps ); EndPaint( hWnd, &ps ); break; case WM_DESTROY: PostQuitMessage( 0 ); break; default: return DefWindowProc( hWnd, message, wParam, lParam ); } return 0; } //-------------------------------------------------------------------------------------- // Render a frame //-------------------------------------------------------------------------------------- void Render() { // Clear the back buffer float ClearColor[4] = { 0.0f, 0.125f, 0.3f, 1.0f }; // red,green,blue,alpha g_pImmediateContext->ClearRenderTargetView( g_pRenderTargetView, ClearColor ); // Render a triangle g_pImmediateContext->VSSetShader( g_pVertexShader, NULL, 0 ); g_pImmediateContext->PSSetShader( g_pPixelShader, NULL, 0 ); g_pImmediateContext->Draw( 3, 0 ); // Present the information rendered to the back buffer to the front buffer (the screen) g_pSwapChain->Present( 0, 0 ); }

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