// WinVSXWView.cpp : implementation of the CWinVSXWView class
//

#include "stdafx.h"
#include "WinVSXW.h"

#include "WinVSXWDoc.h"
#include "WinVSXWView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CWinVSXWView

IMPLEMENT_DYNCREATE(CWinVSXWView, CView)

BEGIN_MESSAGE_MAP(CWinVSXWView, CView)
	//{{AFX_MSG_MAP(CWinVSXWView)
	ON_WM_CREATE()
	ON_WM_SIZE()
	ON_WM_DESTROY()
	ON_WM_ERASEBKGND()
	ON_WM_QUERYNEWPALETTE()
	ON_WM_PALETTECHANGED()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CWinVSXWView construction/destruction

CWinVSXWView::CWinVSXWView()
{
}

CWinVSXWView::~CWinVSXWView()
{
}

BOOL CWinVSXWView::PreCreateWindow(CREATESTRUCT& cs)
{
	cs.style |= (WS_CLIPCHILDREN | WS_CLIPSIBLINGS | CS_OWNDC);
	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CWinVSXWView drawing

void CWinVSXWView::OnDraw(CDC* pDC)
{
	// Make the rendering context current
	wglMakeCurrent(m_hDC,m_hRC);
	
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	// Call our external OpenGL code
	DrawFace();

	// Flush drawing commands
	glFlush();
	
	// Swap our scene to the front
	SwapBuffers(m_hDC);

	// Allow other rendering contexts to co-exist
	wglMakeCurrent(m_hDC,NULL);
}

/////////////////////////////////////////////////////////////////////////////
// CWinVSXWView printing

BOOL CWinVSXWView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CWinVSXWView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
}

void CWinVSXWView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
}

/////////////////////////////////////////////////////////////////////////////
// CWinVSXWView diagnostics

#ifdef _DEBUG
void CWinVSXWView::AssertValid() const
{
	CView::AssertValid();
}

void CWinVSXWView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CWinVSXWDoc* CWinVSXWView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CWinVSXWDoc)));
	return (CWinVSXWDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CWinVSXWView message handlers

int CWinVSXWView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	int nPixelFormat;					// Pixel format index
	m_hDC = ::GetDC(m_hWnd);			// Get the Device context

	static PIXELFORMATDESCRIPTOR pfd = {
		sizeof(PIXELFORMATDESCRIPTOR),	// Size of this structure
		1,								// Version of this structure	
		PFD_DRAW_TO_WINDOW |			// Draw to Window (not to bitmap)
		PFD_SUPPORT_OPENGL |			// Support OpenGL calls in window
		PFD_DOUBLEBUFFER,				// Double buffered mode
		PFD_TYPE_RGBA,					// RGBA Color mode
		24,								// Want 24bit color 
		0,0,0,0,0,0,					// Not used to select mode
		0,0,							// Not used to select mode
		0,0,0,0,0,						// Not used to select mode
		32,								// Size of depth buffer
		0,								// Not used to select mode
		0,								// Not used to select mode
		PFD_MAIN_PLANE,					// Draw in main plane
		0,								// Not used to select mode
		0,0,0 };						// Not used to select mode

	// Choose a pixel format that best matches that described in pfd
	nPixelFormat = ChoosePixelFormat(m_hDC, &pfd);

	// Set the pixel format for the device context
	VERIFY(SetPixelFormat(m_hDC, nPixelFormat, &pfd));

	// Create the rendering context
	m_hRC = wglCreateContext(m_hDC);

	// Make the rendering context current, perform initialization, then
	// deselect it
	VERIFY(wglMakeCurrent(m_hDC,m_hRC));
	
	glClearColor(1.0f, 1.0f, 1.0f, 1.0f);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(20, 1, 4, 12);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
	gluLookAt(0, 0, 8, 0, 0, 0, 0, 1, 0.0);

	glEnable(GL_LIGHTING);
	glEnable(GL_LIGHT0);


	wglMakeCurrent(NULL,NULL);

	// Create the palette if needed
	InitializePalette();
	
	
	return 0;
}

void CWinVSXWView::OnSize(UINT nType, int cx, int cy) 
{
	CView::OnSize(nType, cx, cy);
	
	// TODO: Add your message handler code here
	VERIFY(wglMakeCurrent(m_hDC,m_hRC));
	
	// Set Viewport to window dimensions
    glViewport(0, 0, cx, cy);

	VERIFY(wglMakeCurrent(NULL,NULL));
	
}

void CWinVSXWView::OnDestroy() 
{
	wglDeleteContext(m_hRC);
	::ReleaseDC(m_hWnd,m_hDC);

	CView::OnDestroy();
	
	
}

// Initializes the CPalette object
void CWinVSXWView::InitializePalette(void)
	{
	PIXELFORMATDESCRIPTOR pfd;	// Pixel Format Descriptor
	LOGPALETTE *pPal;			// Pointer to memory for logical palette
	int nPixelFormat;			// Pixel format index
	int nColors;				// Number of entries in palette
	int i;						// Counting variable
	BYTE RedRange,GreenRange,BlueRange;
								// Range for each color entry (7,7,and 3)

	// Get the pixel format index and retrieve the pixel format description
	nPixelFormat = GetPixelFormat(m_hDC);
	DescribePixelFormat(m_hDC, nPixelFormat, sizeof(PIXELFORMATDESCRIPTOR), &pfd);

	// Does this pixel format require a palette?  If not, do not create a
	// palette and just return NULL
	if(!(pfd.dwFlags & PFD_NEED_PALETTE))
		return;

	// Number of entries in palette.  8 bits yeilds 256 entries
	nColors = 1 << pfd.cColorBits;	

	// Allocate space for a logical palette structure plus all the palette entries
	pPal = (LOGPALETTE*)malloc(sizeof(LOGPALETTE) +nColors*sizeof(PALETTEENTRY));

	// Fill in palette header 
	pPal->palVersion = 0x300;		// Windows 3.0
	pPal->palNumEntries = nColors; // table size

	// Build mask of all 1's.  This creates a number represented by having
	// the low order x bits set, where x = pfd.cRedBits, pfd.cGreenBits, and
	// pfd.cBlueBits.  
	RedRange = (1 << pfd.cRedBits) -1;
	GreenRange = (1 << pfd.cGreenBits) - 1;
	BlueRange = (1 << pfd.cBlueBits) -1;

	// Loop through all the palette entries
	for(i = 0; i < nColors; i++)
		{
		// Fill in the 8-bit equivalents for each component
		pPal->palPalEntry[i].peRed = (i >> pfd.cRedShift) & RedRange;
		pPal->palPalEntry[i].peRed = (unsigned char)(
			(double) pPal->palPalEntry[i].peRed * 255.0 / RedRange);

		pPal->palPalEntry[i].peGreen = (i >> pfd.cGreenShift) & GreenRange;
		pPal->palPalEntry[i].peGreen = (unsigned char)(
			(double)pPal->palPalEntry[i].peGreen * 255.0 / GreenRange);

		pPal->palPalEntry[i].peBlue = (i >> pfd.cBlueShift) & BlueRange;
		pPal->palPalEntry[i].peBlue = (unsigned char)(
			(double)pPal->palPalEntry[i].peBlue * 255.0 / BlueRange);

		pPal->palPalEntry[i].peFlags = (unsigned char) NULL;
		}
		
	// Create the palette
	m_GLPalette.CreatePalette(pPal);

	// Go ahead and select and realize the palette for this device context
	SelectPalette(m_hDC,(HPALETTE)m_GLPalette,FALSE);
	RealizePalette(m_hDC);

	// Free the memory used for the logical palette structure
	free(pPal);
	}


BOOL CWinVSXWView::OnQueryNewPalette() 
	{
	// If the palette was created.
	if((HPALETTE)m_GLPalette)
		{
		int nRet;

		// Selects the palette into the current device context
		SelectPalette(m_hDC, (HPALETTE)m_GLPalette, FALSE);

		// Map entries from the currently selected palette to
		// the system palette.  The return value is the number 
		// of palette entries modified.
		nRet = RealizePalette(m_hDC);

		// Repaint, forces remap of palette in current window
		InvalidateRect(NULL,FALSE);

		return nRet;
		}

	return CView::OnQueryNewPalette();
	}


void CWinVSXWView::OnPaletteChanged(CWnd* pFocusWnd) 
	{
	if(((HPALETTE)m_GLPalette != NULL) && (pFocusWnd != this))
		{
		// Select the palette into the device context
		SelectPalette(m_hDC,(HPALETTE)m_GLPalette,FALSE);

		// Map entries to system palette
		RealizePalette(m_hDC);
				
		// Remap the current colors to the newly realized palette
		UpdateColors(m_hDC);
		return;
		}

	CView::OnPaletteChanged(pFocusWnd);
	}

BOOL CWinVSXWView::OnEraseBkgnd(CDC* pDC) 
{
	return FALSE;
}

void CWinVSXWView::DrawFace()
{
	glBegin(GL_POLYGON);
		glVertex3f(-0.5, -0.5, -0.5);
		glVertex3f( 0.5, -0.5, -0.5);
		glVertex3f( 0.5,  0.5, -0.5);
		glVertex3f(-0.5,  0.5, -0.5);
	glEnd();
}