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Posted 30 Oct 2010
Licenced CPOL

Writing a Platform and GUI Toolkit Independent OpenGL Class

, 1 Nov 2010
Article showing how to write OS and GUI toolkit portable OpenGL view class
basecode
linux
MultiGL
GLView
GLViewGTKApp
.project
AUTHORS
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ChangeLog
config.guess
config.h.in
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Makefile.in
missing
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po
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POTFILES.in
README
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GLViewMotifApp
.project
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config.h.in
configure
configure.ac
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Makefile.am
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GLViewQtApp
.project
GLViewQtApp.ico
GLViewQtApp.pro.user
glviewqtapp.qrc
Makefile
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.project
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win32
MultiGL
GLView
GLViewGTKApp
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devcpp
glviewgtkapp.dev
glviewgtkapp.gladep
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msvc
glviewgtkapp.suo
glviewgtkapp.vcproj
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POTFILES.in
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stamp-h.in
GLViewMFCDlgApp
GLViewMFCDlgApp.aps
GLViewMFCDlgApp.vcproj
res
GLViewMFCDlgApp.ico
GLViewMFCMDIApp
GLViewMFCMDIApp.vcproj
res
buttons.bmp
filelarge.bmp
filesmall.bmp
GLViewMFCMDIApp.ico
GLViewMFCMDIAppDoc.ico
main.bmp
Toolbar.bmp
Toolbar256.bmp
writelarge.bmp
writesmall.bmp
GLViewQtApp
GLViewQtApp
GLViewQtApp.ico
glviewqtapp.qrc
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// GLViewMFCDlgAppDlg.cpp : implementation file
//

#include "stdafx.h"
#include "GLViewMFCDlgApp.h"
#include "GLViewMFCDlgAppDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	enum { IDD = IDD_ABOUTBOX };

	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
END_MESSAGE_MAP()


// CGLViewMFCDlgAppDlg dialog




CGLViewMFCDlgAppDlg::CGLViewMFCDlgAppDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CGLViewMFCDlgAppDlg::IDD, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
	m_pGLView = new CGLView();
}

void CGLViewMFCDlgAppDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Control(pDX, IDC_GLFRAME, m_cGLFrame);
}

BEGIN_MESSAGE_MAP(CGLViewMFCDlgAppDlg, CDialog)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
	ON_BN_CLICKED(IDOK, &CGLViewMFCDlgAppDlg::OnBnClickedOk)
	ON_BN_CLICKED(IDCANCEL, &CGLViewMFCDlgAppDlg::OnBnClickedCancel)
END_MESSAGE_MAP()


// CGLViewMFCDlgAppDlg message handlers

BOOL CGLViewMFCDlgAppDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		BOOL bNameValid;
		CString strAboutMenu;
		bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
		ASSERT(bNameValid);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

	// TODO: Add extra initialization here

	if(m_pGLView)
	{
		m_pGLView->SetWindow(m_cGLFrame.GetSafeHwnd());
		m_pGLView->SetupGLContext(true);
		CRect rect;
		m_cGLFrame.GetClientRect(&rect);
		m_pGLView->Resize(rect.Width(), rect.Height());
	}

	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CGLViewMFCDlgAppDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CGLViewMFCDlgAppDlg::OnPaint()
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
		if(m_pGLView)
		{
			m_pGLView->RenderScene();
		}
	}
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CGLViewMFCDlgAppDlg::OnQueryDragIcon()
{
	return static_cast<HCURSOR>(m_hIcon);
}


void CGLViewMFCDlgAppDlg::OnBnClickedOk()
{
	if(m_pGLView)
	{
		delete m_pGLView;
	}
	OnOK();
}

void CGLViewMFCDlgAppDlg::OnBnClickedCancel()
{
	if(m_pGLView)
	{
		delete m_pGLView;
	}
	OnCancel();
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Sharjith
Product Manager Mahindra & Mahindra
India India
Sharjith is a Mechanical Engineer with strong passion for Automobiles, Aircrafts and Software development.

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