// Gl_template.c
//Wyłšczanie błędów przed "fopen"
#define  _CRT_SECURE_NO_WARNINGS

// Ładowanie bibliotek:
#ifdef _MSC_VER                         // Check if MS Visual C compiler
#  pragma comment(lib, "opengl32.lib")  // Compiler-specific directive to avoid manually configuration
#  pragma comment(lib, "glu32.lib")     // Link libraries
#endif

// Ustalanie trybu tekstowego:
#ifdef _MSC_VER        // Check if MS Visual C compiler
#   ifndef _MBCS
#      define _MBCS    // Uses Multi-byte character set
#   endif
#   ifdef _UNICODE     // Not using Unicode character set
#      undef _UNICODE
#   endif
#   ifdef UNICODE
#      undef UNICODE
#   endif
#endif


#include <windows.h>            // Window defines
#include <gl\gl.h>              // OpenGL
#include <gl\glu.h>             // GLU library
#include <math.h>               // Define for sqrt
#include <stdio.h>
#include "resource.h"           // About box resource identifiers.

#define glRGB(x, y, z)  glColor3ub((GLubyte)x, (GLubyte)y, (GLubyte)z)
#define BITMAP_ID 0x4D42        // identyfikator formatu BMP
#define GL_PI 3.14

// Color Palette handle
HPALETTE hPalette = NULL;

// Application name and instance storeage
static LPCTSTR lpszAppName = "GL Template";
static HINSTANCE hInstance;

// Rotation amounts
static GLfloat xRot = 0.0f;
static GLfloat yRot = 0.0f;


static GLsizei lastHeight;
static GLsizei lastWidth;

// Opis tekstury
BITMAPINFOHEADER    bitmapInfoHeader;   // nagłówek obrazu
unsigned char*      bitmapData;         // dane tekstury
unsigned int        texture[2];         // obiekt tekstury


                                        // Declaration for Window procedure
LRESULT CALLBACK WndProc(HWND    hWnd,
    UINT    message,
    WPARAM  wParam,
    LPARAM  lParam);

// Dialog procedure for about box
BOOL APIENTRY AboutDlgProc(HWND hDlg, UINT message, UINT wParam, LONG lParam);

// Set Pixel Format function - forward declaration
void SetDCPixelFormat(HDC hDC);



// Reduces a normal vector specified as a set of three coordinates,
// to a unit normal vector of length one.
void ReduceToUnit(float vector[3])
{
    float length;

    // Calculate the length of the vector
    length = (float)sqrt((vector[0] * vector[0]) +
        (vector[1] * vector[1]) +
        (vector[2] * vector[2]));

    // Keep the program from blowing up by providing an exceptable
    // value for vectors that may calculated too close to zero.
    if (length == 0.0f)
        length = 1.0f;

    // Dividing each element by the length will result in a
    // unit normal vector.
    vector[0] /= length;
    vector[1] /= length;
    vector[2] /= length;
}


// Points p1, p2, & p3 specified in counter clock-wise order
void calcNormal(float v[3][3], float out[3])
{
    float v1[3], v2[3];
    static const int x = 0;
    static const int y = 1;
    static const int z = 2;

    // Calculate two vectors from the three points
    v1[x] = v[0][x] - v[1][x];
    v1[y] = v[0][y] - v[1][y];
    v1[z] = v[0][z] - v[1][z];

    v2[x] = v[1][x] - v[2][x];
    v2[y] = v[1][y] - v[2][y];
    v2[z] = v[1][z] - v[2][z];

    // Take the cross product of the two vectors to get
    // the normal vector which will be stored in out
    out[x] = v1[y] * v2[z] - v1[z] * v2[y];
    out[y] = v1[z] * v2[x] - v1[x] * v2[z];
    out[z] = v1[x] * v2[y] - v1[y] * v2[x];

    // Normalize the vector (shorten length to one)
    ReduceToUnit(out);
}



// Change viewing volume and viewport.  Called when window is resized
void ChangeSize(GLsizei w, GLsizei h)
{
    GLfloat nRange = 100.0f;
    GLfloat fAspect;
    // Prevent a divide by zero
    if (h == 0)
        h = 1;

    lastWidth = w;
    lastHeight = h;

    fAspect = (GLfloat)w / (GLfloat)h;
    // Set Viewport to window dimensions
    glViewport(0, 0, w, h);

    // Reset coordinate system
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();

    // Establish clipping volume (left, right, bottom, top, near, far)
    if (w <= h)
        glOrtho(-nRange, nRange, -nRange*h / w, nRange*h / w, -nRange, nRange);
    else
        glOrtho(-nRange*w / h, nRange*w / h, -nRange, nRange, -nRange, nRange);

    // Establish perspective:
    /*
    gluPerspective(60.0f,fAspect,1.0,400);
    */

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}



// This function does any needed initialization on the rendering
// context.  Here it sets up and initializes the lighting for
// the scene.
void SetupRC()
{
    // Light values and coordinates
    //GLfloat  ambientLight[] = { 0.3f, 0.3f, 0.3f, 1.0f };
    //GLfloat  diffuseLight[] = { 0.7f, 0.7f, 0.7f, 1.0f };
    //GLfloat  specular[] = { 1.0f, 1.0f, 1.0f, 1.0f};
    //GLfloat    lightPos[] = { 0.0f, 150.0f, 150.0f, 1.0f };
    //GLfloat  specref[] =  { 1.0f, 1.0f, 1.0f, 1.0f };


    glEnable(GL_DEPTH_TEST);    // Hidden surface removal
    glFrontFace(GL_CCW);        // Counter clock-wise polygons face out
                                //glEnable(GL_CULL_FACE);       // Do not calculate inside of jet

                                // Enable lighting
                                //glEnable(GL_LIGHTING);

                                // Setup and enable light 0
                                //glLightfv(GL_LIGHT0,GL_AMBIENT,ambientLight);
                                //glLightfv(GL_LIGHT0,GL_DIFFUSE,diffuseLight);
                                //glLightfv(GL_LIGHT0,GL_SPECULAR,specular);
                                //glLightfv(GL_LIGHT0,GL_POSITION,lightPos);
                                //glEnable(GL_LIGHT0);

                                // Enable color tracking
                                //glEnable(GL_COLOR_MATERIAL);

                                // Set Material properties to follow glColor values
                                //glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);

                                // All materials hereafter have full specular reflectivity
                                // with a high shine
                                //glMaterialfv(GL_FRONT, GL_SPECULAR,specref);
                                //glMateriali(GL_FRONT,GL_SHININESS,128);


                                // White background
    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
    // Black brush
    glColor3f(0.0, 0.0, 0.0);
}

void skrzynka(void)
{
    glColor3d(0.8, 0.7, 0.3);


    glEnable(GL_TEXTURE_2D); // Włącz teksturowanie

    glBindTexture(GL_TEXTURE_2D, texture[0]);
    glBegin(GL_QUADS);
    glNormal3d(0, 0, 1);
    glTexCoord2d(1.0, 1.0); glVertex3d(25, 25, 25);
    glTexCoord2d(0.0, 1.0); glVertex3d(-25, 25, 25);
    glTexCoord2d(0.0, 0.0); glVertex3d(-25, -25, 25);
    glTexCoord2d(1.0, 0.0); glVertex3d(25, -25, 25);
    glEnd();
    glBindTexture(GL_TEXTURE_2D, texture[1]);
    glBegin(GL_QUADS);
    glNormal3d(1, 0, 0);
    glTexCoord2d(1.0, 1.0); glVertex3d(25, 25, 25);
    glTexCoord2d(0.0, 1.0); glVertex3d(25, -25, 25);
    glTexCoord2d(0.0, 0.0); glVertex3d(25, -25, -25);
    glTexCoord2d(1.0, 0.0); glVertex3d(25, 25, -25);
    glEnd();

    glDisable(GL_TEXTURE_2D); // Wyłącz teksturowanie



    glBegin(GL_QUADS);
    glNormal3d(0, 0, -1);
    glVertex3d(25, 25, -25);
    glVertex3d(25, -25, -25);
    glVertex3d(-25, -25, -25);
    glVertex3d(-25, 25, -25);

    glNormal3d(-1, 0, 0);
    glVertex3d(-25, 25, -25);
    glVertex3d(-25, -25, -25);
    glVertex3d(-25, -25, 25);
    glVertex3d(-25, 25, 25);

    glNormal3d(0, 1, 0);
    glVertex3d(25, 25, 25);
    glVertex3d(25, 25, -25);
    glVertex3d(-25, 25, -25);
    glVertex3d(-25, 25, 25);

    glNormal3d(0, -1, 0);
    glVertex3d(25, -25, 25);
    glVertex3d(-25, -25, 25);
    glVertex3d(-25, -25, -25);
    glVertex3d(25, -25, -25);
    glEnd();
}

void walec01(void)
{
    GLUquadricObj*obj;
    obj = gluNewQuadric();
    gluQuadricNormals(obj, GLU_SMOOTH);
    glColor3d(1, 0, 0);
    glPushMatrix();
    gluCylinder(obj, 20, 20, 30, 15, 7);
    gluCylinder(obj, 0, 20, 0, 15, 7);
    glTranslated(0, 0, 60);
    glRotated(180.0, 0, 1, 0);
    gluCylinder(obj, 0, 20, 30, 15, 7);
    glPopMatrix();
}

void kula(void)
{
    GLUquadricObj*obj;
    obj = gluNewQuadric();
    gluQuadricTexture(obj, GL_TRUE);
    glBindTexture(GL_TEXTURE_2D, texture[0]);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
    glColor3d(1.0, 0.8, 0.8);
    glEnable(GL_TEXTURE_2D);
    gluSphere(obj, 40, 15, 7);
    glDisable(GL_TEXTURE_2D);
}




// LoadBitmapFile
// opis: ładuje mapę bitową z pliku i zwraca jej adres.
//       Wypełnia strukturę nagłówka.
//   Nie obsługuje map 8-bitowych.
unsigned char *LoadBitmapFile(char *filename, BITMAPINFOHEADER *bitmapInfoHeader)
{
    FILE *filePtr;                          // wskaźnik pozycji pliku
    BITMAPFILEHEADER    bitmapFileHeader;       // nagłówek pliku
    unsigned char       *bitmapImage;           // dane obrazu
    int                 imageIdx = 0;       // licznik pikseli
    unsigned char       tempRGB;                // zmienna zamiany składowych

                                                // otwiera plik w trybie "read binary"
    filePtr = fopen(filename, "rb");
    if (filePtr == NULL)
        return NULL;

    // wczytuje nagłówek pliku
    fread(&bitmapFileHeader, sizeof(BITMAPFILEHEADER), 1, filePtr);

    // sprawdza, czy jest to plik formatu BMP
    if (bitmapFileHeader.bfType != BITMAP_ID)
    {
        fclose(filePtr);
        return NULL;
    }

    // wczytuje nagłówek obrazu
    fread(bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, filePtr);

    // ustawia wskaźnik pozycji pliku na początku danych obrazu
    fseek(filePtr, bitmapFileHeader.bfOffBits, SEEK_SET);

    // przydziela pamięć buforowi obrazu
    bitmapImage = (unsigned char*)malloc(bitmapInfoHeader->biSizeImage);

    // sprawdza, czy udało się przydzielić pamięć
    if (!bitmapImage)
    {
        free(bitmapImage);
        fclose(filePtr);
        return NULL;
    }

    // wczytuje dane obrazu
    fread(bitmapImage, 1, bitmapInfoHeader->biSizeImage, filePtr);

    // sprawdza, czy dane zostały wczytane
    if (bitmapImage == NULL)
    {
        fclose(filePtr);
        return NULL;
    }

    // zamienia miejscami składowe R i B
    for (imageIdx = 0; imageIdx < bitmapInfoHeader->biSizeImage; imageIdx += 3)
    {
        tempRGB = bitmapImage[imageIdx];
        bitmapImage[imageIdx] = bitmapImage[imageIdx + 2];
        bitmapImage[imageIdx + 2] = tempRGB;
    }

    // zamyka plik i zwraca wskaźnik bufora zawierającego wczytany obraz
    fclose(filePtr);
    return bitmapImage;
}

void szescian(void)
{
    //1pomaranczowa
    glBegin(GL_QUADS);
    glColor3d(1, 0.5, 0);
    glVertex3d(20, 20, 20);//prawa górna
    glVertex3d(-20, 20, 20);//lewa górna
    glVertex3d(-20, -20, 20);//lewa dolna
    glVertex3d(20, -20, 20);//prawa dolna

    //2 niebieska
    glColor3d(0, 0.5, 1);
    glVertex3d(20, 20, 20);
    glVertex3d(20, -20, 20);
    glVertex3d(20, -20, -20);
    glVertex3d(20, 20, -20);

    //3 brazowa
    glColor3d(0.5, 0, 0);
    glVertex3d(-20, 20, 20);//te ściany co w 1
    glVertex3d(-20, 20, -20);
    glVertex3d(-20, -20, -20);
    glVertex3d(-20,-20, 20);//te same ściany co w 1

    //4 zielona
    glColor3d(0.5, 1, 0.5);
    glVertex3d(-20, 20, -20);// te same sciany co w 3(górna)
    glVertex3d(20, 20, -20);//te same sciany co w 2(górna)
    glVertex3d(20,-20,-20);//te same sciany co w 2(dolna)
    glVertex3d(-20, -20, -20);//te same sciany co w 3(dolna)

    //5 góra
    glColor3d(1, 0.5, 1);
    glVertex3d(20, 20, -20);
    glVertex3d(-20, 20,-20);
    glVertex3d(-20, 20, 20);
    glVertex3d(20, 20, 20);


    //6 - dół jasnoniebieski
    glColor3d(0.7, 0.8, 1);
    glVertex3d(20, -20, 20);
    glVertex3d(-20, -20, 20);
    glVertex3d(20, -20, -20);
    glVertex3d(-20, -20, -20);


    glEnd();
}

void walec(double r, double h)
{
    double angle, x, y;
    glBegin(GL_TRIANGLE_FAN);
    glVertex3d(0.0f, 0.0f, 0.0f);
    for (angle = 0.0f; angle <= (2.0f*GL_PI);
    angle += (GL_PI / 8.0f))
    {
        x = r*sin(angle);
        y = r*cos(angle);
        glVertex3d(x, y, 0.0);
    }
    glEnd();
    glBegin(GL_QUAD_STRIP);

    for (angle = 0.0f; angle <= (2.0f*GL_PI);angle += (GL_PI / 8.0f))
    {
        x = r*sin(angle);
        y = r*cos(angle);
    glVertex3d(x, y, 0);
    glVertex3d(x, y, h);

    }
    glEnd();

    glColor3d(1, 0.5, 0);
    glBegin(GL_TRIANGLE_FAN);
    glVertex3d(0.0f, 0.0f, h);
    for (angle = 0.0f; angle <= (-2.0f*GL_PI);angle -= (GL_PI / 8.0f))
    {
        x = r*sin(angle);
        y = r*cos(angle);
        glVertex3d(x, y,h);
    }
    glEnd();

}



// Called to draw scene
void RenderScene(void)
{
    //float normal[3];  // Storeage for calculated surface normal

    // Clear the window with current clearing color
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    // Save the matrix state and do the rotations
    glPushMatrix();
    glRotatef(xRot, 1.0f, 0.0f, 0.0f);
    glRotatef(yRot, 0.0f, 1.0f, 0.0f);

    /////////////////////////////////////////////////////////////////
    // MIEJSCE NA KOD OPENGL DO TWORZENIA WLASNYCH SCEN:           //
    /////////////////////////////////////////////////////////////////

    //Sposób na odróźnienie "przedniej" i "tylniej" ściany wielokąta:
    glPolygonMode(GL_BACK, GL_LINE);

    //Uzyskanie siatki:
    //glPolygonMode(GL_FRONT_AND_BACK,GL_LINE);

    //Wyrysowanie prostokata:
    //glRectd(-10.0, -10.0, 20.0, 20.0);
    szescian();
    //walec(30, 20);

    /////////////////////////////////////////////////////////////////
    /////////////////////////////////////////////////////////////////
    /////////////////////////////////////////////////////////////////
    glPopMatrix();
    glMatrixMode(GL_MODELVIEW);

    // Flush drawing commands
    glFlush();
}


// Select the pixel format for a given device context
void SetDCPixelFormat(HDC hDC)
{
    int nPixelFormat;

    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
        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(hDC, &pfd);

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



// If necessary, creates a 3-3-2 palette for the device context listed.
HPALETTE GetOpenGLPalette(HDC hDC)
{
    HPALETTE hRetPal = NULL;    // Handle to palette to be created
    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(hDC);
    DescribePixelFormat(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 NULL;

    // 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
    hRetPal = CreatePalette(pPal);

    // Go ahead and select and realize the palette for this device context
    SelectPalette(hDC, hRetPal, FALSE);
    RealizePalette(hDC);

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

    // Return the handle to the new palette
    return hRetPal;
}


// Entry point of all Windows programs
int APIENTRY WinMain(HINSTANCE       hInst,
    HINSTANCE       hPrevInstance,
    LPSTR           lpCmdLine,
    int                     nCmdShow)
{
    MSG                     msg;            // Windows message structure
    WNDCLASS        wc;                     // Windows class structure
    HWND            hWnd;           // Storeage for window handle

    hInstance = hInst;

    // Register Window style
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = (WNDPROC)WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = NULL;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);

    // No need for background brush for OpenGL window
    wc.hbrBackground = NULL;

    wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1);
    wc.lpszClassName = lpszAppName;

    // Register the window class
    if (RegisterClass(&wc) == 0)
        return FALSE;


    // Create the main application window
    hWnd = CreateWindow(
        lpszAppName,
        lpszAppName,

        // OpenGL requires WS_CLIPCHILDREN and WS_CLIPSIBLINGS
        WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN | WS_CLIPSIBLINGS,

        // Window position and size
        50, 50,
        400, 400,
        NULL,
        NULL,
        hInstance,
        NULL);

    // If window was not created, quit
    if (hWnd == NULL)
        return FALSE;


    // Display the window
    ShowWindow(hWnd, SW_SHOW);
    UpdateWindow(hWnd);

    // Process application messages until the application closes
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}




// Window procedure, handles all messages for this program
LRESULT CALLBACK WndProc(HWND    hWnd,
    UINT    message,
    WPARAM  wParam,
    LPARAM  lParam)
{
    static HGLRC hRC;               // Permenant Rendering context
    static HDC hDC;                 // Private GDI Device context

    switch (message)
    {
        // Window creation, setup for OpenGL
    case WM_CREATE:
        // Store the device context
        hDC = GetDC(hWnd);

        // Select the pixel format
        SetDCPixelFormat(hDC);

        // Create palette if needed
        hPalette = GetOpenGLPalette(hDC);

        // Create the rendering context and make it current
        hRC = wglCreateContext(hDC);
        wglMakeCurrent(hDC, hRC);
        SetupRC();
        glGenTextures(2, &texture[0]);                  // tworzy obiekt tekstury

                                                        // ładuje pierwszy obraz tekstury:
        bitmapData = LoadBitmapFile("Bitmapy\\checker.bmp", &bitmapInfoHeader);

        glBindTexture(GL_TEXTURE_2D, texture[0]);       // aktywuje obiekt tekstury

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

        // tworzy obraz tekstury
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, bitmapInfoHeader.biWidth,
            bitmapInfoHeader.biHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, bitmapData);

        if (bitmapData)
            free(bitmapData);

        // ładuje drugi obraz tekstury:
        bitmapData = LoadBitmapFile("Bitmapy\\crate.bmp", &bitmapInfoHeader);
        glBindTexture(GL_TEXTURE_2D, texture[1]);       // aktywuje obiekt tekstury

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);

        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);

        // tworzy obraz tekstury
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, bitmapInfoHeader.biWidth,
            bitmapInfoHeader.biHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, bitmapData);

        if (bitmapData)
            free(bitmapData);

        // ustalenie sposobu mieszania tekstury z tłem
        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
        break;

        // Window is being destroyed, cleanup
    case WM_DESTROY:
        // Deselect the current rendering context and delete it
        wglMakeCurrent(hDC, NULL);
        wglDeleteContext(hRC);

        // Delete the palette if it was created
        if (hPalette != NULL)
            DeleteObject(hPalette);

        // Tell the application to terminate after the window
        // is gone.
        PostQuitMessage(0);
        break;

        // Window is resized.
    case WM_SIZE:
        // Call our function which modifies the clipping
        // volume and viewport
        ChangeSize(LOWORD(lParam), HIWORD(lParam));
        break;


        // The painting function.  This message sent by Windows
        // whenever the screen needs updating.
    case WM_PAINT:
    {
        // Call OpenGL drawing code
        RenderScene();

        SwapBuffers(hDC);

        // Validate the newly painted client area
        ValidateRect(hWnd, NULL);
    }
    break;

    // Windows is telling the application that it may modify
    // the system palette.  This message in essance asks the
    // application for a new palette.
    case WM_QUERYNEWPALETTE:
        // If the palette was created.
        if (hPalette)
        {
            int nRet;

            // Selects the palette into the current device context
            SelectPalette(hDC, hPalette, FALSE);

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

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

            return nRet;
        }
        break;


        // This window may set the palette, even though it is not the
        // currently active window.
    case WM_PALETTECHANGED:
        // Don't do anything if the palette does not exist, or if
        // this is the window that changed the palette.
        if ((hPalette != NULL) && ((HWND)wParam != hWnd))
        {
            // Select the palette into the device context
            SelectPalette(hDC, hPalette, FALSE);

            // Map entries to system palette
            RealizePalette(hDC);

            // Remap the current colors to the newly realized palette
            UpdateColors(hDC);
            return 0;
        }
        break;

        // Key press, check for arrow keys to do cube rotation.
    case WM_KEYDOWN:
    {
        if (wParam == VK_UP)
            xRot -= 5.0f;

        if (wParam == VK_DOWN)
            xRot += 5.0f;

        if (wParam == VK_LEFT)
            yRot -= 5.0f;

        if (wParam == VK_RIGHT)
            yRot += 5.0f;

        xRot = (const int)xRot % 360;
        yRot = (const int)yRot % 360;

        InvalidateRect(hWnd, NULL, FALSE);
    }
    break;

    // A menu command
    case WM_COMMAND:
    {
        switch (LOWORD(wParam))
        {
            // Exit the program
        case ID_FILE_EXIT:
            DestroyWindow(hWnd);
            break;
        }
    }
    break;


    default:   // Passes it on if unproccessed
        return (DefWindowProc(hWnd, message, wParam, lParam));

    }

    return (0L);
}