// cubeview.cpp : implementation of the CCubeView class
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

#include "stdafx.h"
#include "cube.h"

#include "cubedoc.h"
#include "cubeview.h"

#include "gl\gl.h"
#include "gl\glu.h"

#ifdef _DEBUG
#undef THIS_FILE
static char BASED_CODE THIS_FILE[] = __FILE__;
#endif

unsigned char threeto8[8] =
{
	0, 0111>>1, 0222>>1, 0333>>1, 0444>>1, 0555>>1, 0666>>1, 0377
};

unsigned char twoto8[4] =
{
	0, 0x55, 0xaa, 0xff
};

unsigned char oneto8[2] =
{
	0, 255
};

static int defaultOverride[13] =
{
	0, 3, 24, 27, 64, 67, 88, 173, 181, 236, 247, 164, 91
};

static PALETTEENTRY defaultPalEntry[20] =
{
	{ 0,   0,   0,    0 },
	{ 0x80,0,   0,    0 },
	{ 0,   0x80,0,    0 },
	{ 0x80,0x80,0,    0 },
	{ 0,   0,   0x80, 0 },
	{ 0x80,0,   0x80, 0 },
	{ 0,   0x80,0x80, 0 },
	{ 0xC0,0xC0,0xC0, 0 },

	{ 192, 220, 192,  0 },
	{ 166, 202, 240,  0 },
	{ 255, 251, 240,  0 },
	{ 160, 160, 164,  0 },

	{ 0x80,0x80,0x80, 0 },
	{ 0xFF,0,   0,    0 },
	{ 0,   0xFF,0,    0 },
	{ 0xFF,0xFF,0,    0 },
	{ 0,   0,   0xFF, 0 },
	{ 0xFF,0,   0xFF, 0 },
	{ 0,   0xFF,0xFF, 0 },
	{ 0xFF,0xFF,0xFF, 0 }
};

/////////////////////////////////////////////////////////////////////////////
// CCubeView

IMPLEMENT_DYNCREATE(CCubeView, CView)

BEGIN_MESSAGE_MAP(CCubeView, CView)
	//{{AFX_MSG_MAP(CCubeView)
	ON_COMMAND(ID_FILE_PLAY, OnFilePlay)
	ON_UPDATE_COMMAND_UI(ID_FILE_PLAY, OnUpdateFilePlay)
	ON_WM_CREATE()
	ON_WM_DESTROY()
	ON_WM_SIZE()
	ON_WM_TIMER()
	ON_WM_ERASEBKGND()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCubeView construction/destruction

CCubeView::CCubeView()
{
	m_pDC = NULL;
	m_pOldPalette = NULL;
	m_play = FALSE;
}

CCubeView::~CCubeView()
{
}

/////////////////////////////////////////////////////////////////////////////
// CCubeView drawing

void CCubeView::OnDraw(CDC* pDC)
{
	CCubeDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	DrawScene();
}

/////////////////////////////////////////////////////////////////////////////
// CCubeView diagnostics

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

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

CCubeDoc* CCubeView::GetDocument() // non-debug version is inline
{
	return STATIC_DOWNCAST(CCubeDoc, m_pDocument);
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CCubeView message handlers

void CCubeView::OnFilePlay()
{
	m_play = m_play ? FALSE : TRUE;
	if (m_play)
		SetTimer(1, 15, NULL);
	else
		KillTimer(1);
}

void CCubeView::OnUpdateFilePlay(CCmdUI* pCmdUI)
{
	pCmdUI->SetCheck(m_play);
}

BOOL CCubeView::PreCreateWindow(CREATESTRUCT& cs)
{
	// An OpenGL window must be created with the following flags and must not
	// include CS_PARENTDC for the class style. Refer to SetPixelFormat
	// documentation in the "Comments" section for further information.
	cs.style |= WS_CLIPSIBLINGS | WS_CLIPCHILDREN;

	return CView::PreCreateWindow(cs);
}

int CCubeView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;

	Init(); // initialize OpenGL

	return 0;
}

void CCubeView::OnDestroy()
{
	HGLRC   hrc;

	KillTimer(1);

	hrc = ::wglGetCurrentContext();

	::wglMakeCurrent(NULL,  NULL);

	if (hrc)
		::wglDeleteContext(hrc);

	if (m_pOldPalette)
		m_pDC->SelectPalette(m_pOldPalette, FALSE);

	if (m_pDC)
		delete m_pDC;

	CView::OnDestroy();
}

void CCubeView::OnSize(UINT nType, int cx, int cy)
{
	CView::OnSize(nType, cx, cy);

	if(cy > 0)
	{
		glViewport(0, 0, cx, cy);

		if((m_oldRect.right > cx) || (m_oldRect.bottom > cy))
			RedrawWindow();

		m_oldRect.right = cx;
		m_oldRect.bottom = cy;

		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		gluPerspective(45.0f, (GLdouble)cx/cy, 3.0f, 7.0f);
		glMatrixMode(GL_MODELVIEW);
	}
}

void CCubeView::OnTimer(UINT nIDEvent)
{
	DrawScene();

	CView::OnTimer(nIDEvent);

	// Eat spurious WM_TIMER messages
	MSG msg;
	while(::PeekMessage(&msg, m_hWnd, WM_TIMER, WM_TIMER, PM_REMOVE));
}

/////////////////////////////////////////////////////////////////////////////
// GL helper functions

void CCubeView::Init()
{
	PIXELFORMATDESCRIPTOR pfd;
	int         n;
	HGLRC       hrc;
	GLfloat     fMaxObjSize, fAspect;
	GLfloat     fNearPlane, fFarPlane;

	m_pDC = new CClientDC(this);

	ASSERT(m_pDC != NULL);

	if (!bSetupPixelFormat())
		return;

	n = ::GetPixelFormat(m_pDC->GetSafeHdc());
	::DescribePixelFormat(m_pDC->GetSafeHdc(), n, sizeof(pfd), &pfd);

	CreateRGBPalette();

	hrc = wglCreateContext(m_pDC->GetSafeHdc());
	wglMakeCurrent(m_pDC->GetSafeHdc(), hrc);

	GetClientRect(&m_oldRect);
	glClearDepth(1.0f);
	glEnable(GL_DEPTH_TEST);

	if (m_oldRect.bottom)
		fAspect = (GLfloat)m_oldRect.right/m_oldRect.bottom;
	else    // don't divide by zero, not that we should ever run into that...
		fAspect = 1.0f;
	fNearPlane = 3.0f;
	fFarPlane = 7.0f;
	fMaxObjSize = 3.0f;
	m_fRadius = fNearPlane + fMaxObjSize / 2.0f;

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluPerspective(45.0f, fAspect, fNearPlane, fFarPlane);
	glMatrixMode(GL_MODELVIEW);
}

BOOL CCubeView::bSetupPixelFormat()
{
	static PIXELFORMATDESCRIPTOR pfd =
	{
		sizeof(PIXELFORMATDESCRIPTOR),  // size of this pfd
		1,                              // version number
		PFD_DRAW_TO_WINDOW |            // support window
		  PFD_SUPPORT_OPENGL |          // support OpenGL
		  PFD_DOUBLEBUFFER,             // double buffered
		PFD_TYPE_RGBA,                  // RGBA type
		24,                             // 24-bit color depth
		0, 0, 0, 0, 0, 0,               // color bits ignored
		0,                              // no alpha buffer
		0,                              // shift bit ignored
		0,                              // no accumulation buffer
		0, 0, 0, 0,                     // accum bits ignored
		32,                             // 32-bit z-buffer
		0,                              // no stencil buffer
		0,                              // no auxiliary buffer
		PFD_MAIN_PLANE,                 // main layer
		0,                              // reserved
		0, 0, 0                         // layer masks ignored
	};
	int pixelformat;

	if ( (pixelformat = ChoosePixelFormat(m_pDC->GetSafeHdc(), &pfd)) == 0 )
	{
		MessageBox("ChoosePixelFormat failed");
		return FALSE;
	}

	if (SetPixelFormat(m_pDC->GetSafeHdc(), pixelformat, &pfd) == FALSE)
	{
		MessageBox("SetPixelFormat failed");
		return FALSE;
	}

	return TRUE;
}

unsigned char CCubeView::ComponentFromIndex(int i, UINT nbits, UINT shift)
{
	unsigned char val;

	val = (unsigned char) (i >> shift);
	switch (nbits)
	{

	case 1:
		val &= 0x1;
		return oneto8[val];
	case 2:
		val &= 0x3;
		return twoto8[val];
	case 3:
		val &= 0x7;
		return threeto8[val];

	default:
		return 0;
	}
}


void CCubeView::CreateRGBPalette()
{
	PIXELFORMATDESCRIPTOR pfd;
	LOGPALETTE *pPal;
	int n, i;

	n = ::GetPixelFormat(m_pDC->GetSafeHdc());
	::DescribePixelFormat(m_pDC->GetSafeHdc(), n, sizeof(pfd), &pfd);

	if (pfd.dwFlags & PFD_NEED_PALETTE)
	{
		n = 1 << pfd.cColorBits;
		pPal = (PLOGPALETTE) new char[sizeof(LOGPALETTE) + n * sizeof(PALETTEENTRY)];

		ASSERT(pPal != NULL);

		pPal->palVersion = 0x300;
		pPal->palNumEntries = n;
		for (i=0; i<n; i++)
		{
			pPal->palPalEntry[i].peRed =
					ComponentFromIndex(i, pfd.cRedBits, pfd.cRedShift);
			pPal->palPalEntry[i].peGreen =
					ComponentFromIndex(i, pfd.cGreenBits, pfd.cGreenShift);
			pPal->palPalEntry[i].peBlue =
					ComponentFromIndex(i, pfd.cBlueBits, pfd.cBlueShift);
			pPal->palPalEntry[i].peFlags = 0;
		}

		/* fix up the palette to include the default GDI palette */
		if ((pfd.cColorBits == 8)                           &&
			(pfd.cRedBits   == 3) && (pfd.cRedShift   == 0) &&
			(pfd.cGreenBits == 3) && (pfd.cGreenShift == 3) &&
			(pfd.cBlueBits  == 2) && (pfd.cBlueShift  == 6)
		   )
		{
			for (i = 1 ; i <= 12 ; i++)
				pPal->palPalEntry[defaultOverride[i]] = defaultPalEntry[i];
		}

		m_cPalette.CreatePalette(pPal);
		delete pPal;

		m_pOldPalette = m_pDC->SelectPalette(&m_cPalette, FALSE);
		m_pDC->RealizePalette();
	}
}

void CCubeView::DrawScene(void)
{
	static BOOL     bBusy = FALSE;
	static GLfloat  wAngleY = 10.0f;
	static GLfloat  wAngleX = 1.0f;
	static GLfloat  wAngleZ = 5.0f;

	if(bBusy)
		return;
	bBusy = TRUE;

	glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glPushMatrix();

		glTranslatef(0.0f, 0.0f, -m_fRadius);
		glRotatef(wAngleX, 1.0f, 0.0f, 0.0f);
		glRotatef(wAngleY, 0.0f, 1.0f, 0.0f);
		glRotatef(wAngleZ, 0.0f, 0.0f, 1.0f);

		wAngleX += 1.0f;
		wAngleY += 10.0f;
		wAngleZ += 5.0f;


		glBegin(GL_QUAD_STRIP);
			glColor3f(1.0f, 0.0f, 1.0f);
			glVertex3f(-0.5f, 0.5f, 0.5f);

			glColor3f(1.0f, 0.0f, 0.0f);
			glVertex3f(-0.5f, -0.5f, 0.5f);

			glColor3f(1.0f, 1.0f, 1.0f);
			glVertex3f(0.5f, 0.5f, 0.5f);

			glColor3f(1.0f, 1.0f, 0.0f);
			glVertex3f(0.5f, -0.5f, 0.5f);

			glColor3f(0.0f, 1.0f, 1.0f);
			glVertex3f(0.5f, 0.5f, -0.5f);

			glColor3f(0.0f, 1.0f, 0.0f);
			glVertex3f(0.5f, -0.5f, -0.5f);

			glColor3f(0.0f, 0.0f, 1.0f);
			glVertex3f(-0.5f, 0.5f, -0.5f);

			glColor3f(0.0f, 0.0f, 0.0f);
			glVertex3f(-0.5f, -0.5f,  -0.5f);

			glColor3f(1.0f, 0.0f, 1.0f);
			glVertex3f(-0.5f, 0.5f, 0.5f);

			glColor3f(1.0f, 0.0f, 0.0f);
			glVertex3f(-0.5f, -0.5f, 0.5f);

		glEnd();

		glBegin(GL_QUADS);
			glColor3f(1.0f, 0.0f, 1.0f);
			glVertex3f(-0.5f, 0.5f, 0.5f);

			glColor3f(1.0f, 1.0f, 1.0f);
			glVertex3f(0.5f, 0.5f, 0.5f);

			glColor3f(0.0f, 1.0f, 1.0f);
			glVertex3f(0.5f, 0.5f, -0.5f);

			glColor3f(0.0f, 0.0f, 1.0f);
			glVertex3f(-0.5f, 0.5f, -0.5f);
		glEnd();

		glBegin(GL_QUADS);
			glColor3f(1.0f, 0.0f, 0.0f);
			glVertex3f(-0.5f, -0.5f, 0.5f);

			glColor3f(1.0f, 1.0f, 0.0f);
			glVertex3f(0.5f, -0.5f, 0.5f);

			glColor3f(0.0f, 1.0f, 0.0f);
			glVertex3f(0.5f, -0.5f, -0.5f);

			glColor3f(0.0f, 0.0f, 0.0f);
			glVertex3f(-0.5f, -0.5f,  -0.5f);
		glEnd();

	glPopMatrix();

	glFinish();
	SwapBuffers(wglGetCurrentDC());

	bBusy = FALSE;
}

BOOL CCubeView::OnEraseBkgnd(CDC* pDC)
{
	return TRUE;
}