OAG Library (OpenGL) Part 1 - Setting Up the Library for an MFC Application

#include "..\..\..\OpenGL\include\WindowsViewer\WinGraphicContext.h"

oag::WinGraphicContext::WinGraphicContext(void)
:m_bIsDone(FALSE)
,m_pDC(NULL)
,m_hRC(NULL)
,X(0)
,Y(0)
,m_WindowWidth(0)
,m_WindowHeight(0)
{

}

oag::WinGraphicContext::WinGraphicContext(CWnd* pWindow)
:m_bIsDone(FALSE)
,m_pDC(NULL)
,m_hRC(NULL)
,X(0)
,Y(0)
,m_WindowWidth(0)
,m_WindowHeight(0)
{
	m_pDC = new CClientDC(pWindow);

	if( m_pDC )
	{
		if (!SetDCPixelFormat(m_pDC->GetSafeHdc(), PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER )) 
			return;

		m_hRC = ::wglCreateContext(m_pDC->GetSafeHdc());

		CRect rect;
		pWindow->GetClientRect(rect);

		m_WindowWidth = rect.Width();
		m_WindowHeight = rect.Height();
	}
}

oag::WinGraphicContext::~WinGraphicContext(void)
{
	if (m_hRC != NULL)
	{
		::wglDeleteContext(m_hRC);	
		m_hRC = NULL;
	}

	if(m_pDC != NULL)
	{
		delete m_pDC;
		m_pDC = NULL;
	}
}

//Operations
bool oag::WinGraphicContext::SetDCPixelFormat(HDC hDC, DWORD dwFlags)
{
	PIXELFORMATDESCRIPTOR pixelDescriptor;
	
	pixelDescriptor.nSize			= sizeof(PIXELFORMATDESCRIPTOR);
	pixelDescriptor.nVersion		= 1;
	pixelDescriptor.dwFlags			= dwFlags;
	pixelDescriptor.iPixelType		= PFD_TYPE_RGBA;
	pixelDescriptor.cColorBits		= 16;
	pixelDescriptor.cRedBits = 8;
	pixelDescriptor.cRedShift = 16;
	pixelDescriptor.cGreenBits = 8;
	pixelDescriptor.cGreenShift = 8;
	pixelDescriptor.cBlueBits = 8;
	pixelDescriptor.cBlueShift = 0;
	pixelDescriptor.cAlphaBits = 0;
	pixelDescriptor.cAlphaShift = 0;
	pixelDescriptor.cAccumBits = 64;
	pixelDescriptor.cAccumRedBits = 16;
	pixelDescriptor.cAccumGreenBits = 16;
	pixelDescriptor.cAccumBlueBits = 16;
	pixelDescriptor.cAccumAlphaBits = 0;
	pixelDescriptor.cDepthBits = 32;
	pixelDescriptor.cStencilBits = 8;
	pixelDescriptor.cAuxBuffers = 0;
	pixelDescriptor.iLayerType = PFD_MAIN_PLANE;
	pixelDescriptor.bReserved = 0;
	pixelDescriptor.dwLayerMask = 0;
	pixelDescriptor.dwVisibleMask = 0;
	pixelDescriptor.dwDamageMask = 0;
	
	int nPixelIndex					= ::ChoosePixelFormat(hDC, &pixelDescriptor);
	
	if (nPixelIndex == 0) //*** Choose default
	{
		nPixelIndex = 1;
		
		if (::DescribePixelFormat(hDC, nPixelIndex, sizeof(PIXELFORMATDESCRIPTOR), &pixelDescriptor) == 0) return FALSE;
	}

	if (!::SetPixelFormat(hDC, nPixelIndex, &pixelDescriptor)) return FALSE;

	return true;
}

void oag::WinGraphicContext::OnSize(int width, int height)
{
	m_WindowWidth = width; m_WindowHeight = height;
}

BOOL oag::WinGraphicContext::MakeCurrent()
{
	BOOL bMake = false;

	if( m_hRC )
		bMake = ::wglMakeCurrent(m_pDC->GetSafeHdc(), m_hRC); 

	return bMake;
}

void oag::WinGraphicContext::DeleteCurrent()
{
	::wglMakeCurrent(NULL, NULL);
}