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main.cpp

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// ~~~ OpenGL & Win32 ~~~
// Tutorial No.7 - Dialogs, Text and FPS
// Alan Baylis 2001

#include <windows.h>
#include "shared.h"
#include "general.h"
#include "vector.h"
#include "vertex.h"
#include "quat.h"
#include "matrix.h"
#include "texture.h"
#include "locmath.h"
#include "polygon.h"
#include "object.h"
#include "camera.h"
#include "light.h"
#include "collision.h"
#include "winfuncs.h"
#include "glfont.c"            // font routines
#include "mmgr.h"
#include "resource.rh"


// Windows
static HGLRC hRC;
static HDC hDC;
HWND hWnd;
RECT screen;
PAINTSTRUCT ps;

// Math
float pi = 3.141592;
float radian = pi / 180;
float epsilon = 0.05;

// Input
bool key[256];
bool released_key[256];

// Cameras
int currentCamera = 0;
int numCameras = 4;
float step = 5.0;

// Timing
float lasttime;
float multiplier;
const int average = 20;
float lastmultiplier[average];
int fps;

// Lights
int GL_LIGHT[8] = {GL_LIGHT0, GL_LIGHT1, GL_LIGHT2, GL_LIGHT3, GL_LIGHT4, GL_LIGHT5, GL_LIGHT6, GL_LIGHT7};    // Represent GL lights in a conveniant array
int currentLight = 0;
int numLights = 0;

// Cube polygons
POLYGON * polygon = new POLYGON[12];

// Texture
TEXTURE * texture = new TEXTURE[1];

// Camera
CAMERA * camera = new CAMERA[numCameras + 1];
CAMERA LastCam;

// Lighting
LIGHT * light = new LIGHT[numLights + 1];
float lightColor[3] = {1.0, 1.0, 1.0};

// Dialogs
int DialogInUse = 0;
int testint;               // variables used to test dialog input
float testfloat;
char teststring[64];

// Font
GLFONT myFont;              // the font to use

void InitGL(int Width, int Height)
{
    SetGLProperties();
    SetGLMaterial();
    SetGLView(Width, Height);
    SetGLLighting(light);
    SetGLWorld(polygon);
    SetGLTexture(texture);
    SetGLCamera(camera);
    glFontCreate(&myFont, "roman.glf", 2);    // create the font from the glf file
}

void ReSizeGLScene(int Width, int Height)
{
    SetGLView(Width, Height);
}

void DrawGLScene(void)
{
      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    LastCam = camera[currentCamera];
    camera[currentCamera].Update();

    // initialize collision detection structure
    CollisionPacket cp;
    cp.eRadius.x = 1.0;
    cp.eRadius.y = 1.0;
    cp.eRadius.z = 1.0;
    cp.sourcePoint.x = LastCam.Position.x;
    cp.sourcePoint.y = LastCam.Position.y;
    cp.sourcePoint.z = LastCam.Position.z;
    cp.velocity.x = camera[currentCamera].Position.x - LastCam.Position.x;
    cp.velocity.y = camera[currentCamera].Position.y - LastCam.Position.y;
    cp.velocity.z = camera[currentCamera].Position.z - LastCam.Position.z;

    CheckForCollision(polygon, &camera[currentCamera].Position, &cp);

    camera[currentCamera].Apply();

    int loop;
    for(loop = 0; loop <= numLights; loop++)
        light[loop].Apply();
/*
    // if the light sphere position is in view draw a small green sphere
    if(CheckClipPlanes(camera[currentCamera], light[currentLight].Position))
    {
        glPushMatrix();
        glLoadIdentity();
        DrawGreenSphere();
        glPopMatrix();
    }
*/    
    DrawLightSphere(light);
    DrawGrid();
    DrawCube(polygon, texture);
    DrawSphere();
    DrawCone();

// Draw text
        glBlendFunc(GL_SRC_ALPHA,  GL_ONE_MINUS_SRC_ALPHA) ;
    glDisable(GL_LIGHTING);
    glColor3f(0.0, 1.0, 0.0);
    glEnable(GL_BLEND);
    glDisable(GL_DEPTH_TEST);
    glPushMatrix();
    glLoadIdentity();
    glFontBegin(&myFont);
    char text[256];

    glFontTextOut("Tutorial #7", -37, 27, -70);

    sprintf(text, "FPS = %d", fps);
    glFontTextOut(text, -52, 34, -100);

    sprintf(text, "Integer = %d", testint);
    glFontTextOut(text, -52, -30, -100);

    sprintf(text, "Float = %f", testfloat);
    glFontTextOut(text, -52, -32, -100);

    sprintf(text, "%s", "String = ");
    strcat(text, teststring);
    glFontTextOut(text, -52, -34, -100);

    glFontEnd();
    glPopMatrix();
    glEnable(GL_DEPTH_TEST);
        glDisable(GL_BLEND);
    glEnable(GL_LIGHTING);
}

LRESULT CALLBACK WndProc(    HWND    hWnd,
                            UINT    message,
                            WPARAM    wParam,
                            LPARAM    lParam)
{
    GLuint    PixelFormat;
    static    PIXELFORMATDESCRIPTOR pfd=
    {
           sizeof(PIXELFORMATDESCRIPTOR),
        1,
        PFD_DRAW_TO_WINDOW |
        PFD_SUPPORT_OPENGL |
        PFD_DOUBLEBUFFER,
        PFD_TYPE_RGBA,
        16,
        0, 0, 0, 0, 0, 0,
        0,
        0,
        0,
        0, 0, 0, 0,
        16,
        0,
        0,
        PFD_MAIN_PLANE,
        0,
        0, 0, 0
    };


    switch (message)
    {
        case WM_CREATE:
            hDC = GetDC(hWnd);

            PixelFormat = ChoosePixelFormat(hDC, &pfd);

            if (!PixelFormat)
            {
                   MessageBox(NULL,"Can't find a suitable PixelFormat.","Error",MB_OK|MB_ICONERROR);
                PostQuitMessage(0);
                break;
            }

            if(!SetPixelFormat(hDC,PixelFormat,&pfd))
            {
                MessageBox(NULL,"Can't set the PixelFormat.","Error",MB_OK|MB_ICONERROR);
                PostQuitMessage(0);
                break;
            }

            hRC = wglCreateContext(hDC);
            if(!hRC)
            {
                MessageBox(NULL,"Can't create a GL Rendering Context.","Error",MB_OK|MB_ICONERROR);
                PostQuitMessage(0);
                break;
            }

            if(!wglMakeCurrent(hDC, hRC))
            {
                MessageBox(NULL,"Can't activate the GL Rendering Context.","Error",MB_OK|MB_ICONERROR);
                PostQuitMessage(0);
                break;
            }
            InitGL(screen.right, screen.bottom);
        break;

        case WM_SYSCOMMAND:
        {
            switch (wParam)
            {
                case SC_SCREENSAVE:
                case SC_MONITORPOWER:
                    return 0;
            }
            break;
        }

// required when a dialog window is moved or resized
        if (DialogInUse)
        {
            case WM_PAINT:
                BeginPaint(hWnd,&ps);
                DrawGLScene();
                glFlush();
                SwapBuffers(hDC);
                EndPaint(hWnd,&ps);
            break;
        }

        case WM_DESTROY:
        case WM_CLOSE:
            glFontDestroy(&myFont); // free fonts allocated memory         
        
            delete[] texture;
            delete[] polygon;
            delete[] camera;
            delete[] light;
            ChangeDisplaySettings(NULL, 0);

            wglMakeCurrent(hDC,NULL);
            wglDeleteContext(hRC);
            ReleaseDC(hWnd,hDC);

            PostQuitMessage(0);
        break;

        case WM_KEYDOWN:
            key[wParam] = TRUE;
        break;

        case WM_KEYUP:
            key[wParam] = FALSE;
        break;

        case WM_SIZE:
            SetCursorPos((int)(screen.right * 0.5), (int)(screen.bottom * 0.5));
            ReSizeGLScene(LOWORD(lParam),HIWORD(lParam));
        break;

        case WM_MOUSEMOVE:
            camera[currentCamera].Delta_x = float(HIWORD(lParam) - screen.bottom * 0.5) * 10;
            camera[currentCamera].Delta_y = float(LOWORD(lParam) - screen.right * 0.5) * 10;
        break;

        case WM_LBUTTONDOWN:
            camera[currentCamera].Delta_z = -120.0;
        break;

        case WM_RBUTTONDOWN:
            camera[currentCamera].Delta_z = 120.0;
        break;

        case WM_LBUTTONUP:
            if (wParam != MK_RBUTTON)
                camera[currentCamera].Delta_z = 0.0;
        break;

        case WM_RBUTTONUP:
            if (wParam != MK_LBUTTON)
                camera[currentCamera].Delta_z = 0.0;
        break;

        default:
            return (DefWindowProc(hWnd, message, wParam, lParam));
    }
return (0);
}

int WINAPI WinMain(    HINSTANCE    hInstance,
                    HINSTANCE,
                    LPSTR,
                    int)
{
    MSG        msg;
    WNDCLASSEX    wc;

    GetWindowRect(GetDesktopWindow(), &screen);
    wc.cbSize = sizeof(WNDCLASSEX);
    wc.style            = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_SAVEBITS;
    wc.lpfnWndProc        = (WNDPROC) WndProc;
    wc.cbClsExtra        = 0;
    wc.cbWndExtra        = 0;
    wc.hInstance        = hInstance;
    wc.hIcon            = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MYICON));
    wc.hIconSm          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MYICON));
    wc.hCursor            = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground    = NULL;
    wc.lpszMenuName        = NULL;
    wc.lpszClassName    = "OpenGL WinClass";


    if(!RegisterClassEx(&wc))
    {
        MessageBox(NULL,"Failed To Register The Window Class.","Error",MB_OK|MB_ICONERROR);
        return FALSE;
    }

    hWnd = CreateWindowEx(
    WS_EX_LEFT,
    "OpenGL WinClass",
    "OpenGL & Win32 Tutorial No.5",

    WS_MAXIMIZE |
    WS_CLIPCHILDREN |
    WS_CLIPSIBLINGS |
    WS_POPUPWINDOW |
    WS_VISIBLE,
    0, 0,
    screen.right, screen.bottom,
    NULL,
    NULL,
    hInstance,
    NULL);

    if(!hWnd)
    {
        MessageBox(NULL,"Window Creation Error.","Error",MB_OK|MB_ICONERROR);
        return FALSE;
    }

    DEVMODE dmScreenSettings;

    memset(&dmScreenSettings, 0, sizeof(DEVMODE));
    dmScreenSettings.dmSize        = sizeof(DEVMODE);
    dmScreenSettings.dmPelsWidth    = screen.right;
    dmScreenSettings.dmPelsHeight    = screen.bottom;
    dmScreenSettings.dmFields    = DM_PELSWIDTH | DM_PELSHEIGHT;
    ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN);

    ShowWindow(hWnd, SW_HIDE);
    if(DialogBox(hInstance, "NAMEOFDLG", hWnd, (DLGPROC)NameOfProc) == IDOK) // calls the initialization dialog
    {
        ShowWindow(hWnd, SW_SHOW);
        UpdateWindow(hWnd);
        SetFocus(hWnd);
            wglMakeCurrent(hDC,hRC);
        SetCursorPos((int)(screen.right * 0.5), (int)(screen.bottom * 0.5));
        ShowCursor(0);
        }
    else
    {
        MessageBox(NULL,"Dialog Box Failed or You Cancelled It","Error",MB_OK|MB_ICONERROR);    
        delete[] texture;
        delete[] polygon;
        delete[] camera;
        delete[] light;
        PostQuitMessage(0);
    }

    while (1)
    {
        while (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE))
        {
            if (GetMessage(&msg, NULL, 0, 0))
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
            else
            {
                return TRUE;
            }
        }

        if(!DialogInUse)
        {
            SetCursorPos((int)(screen.right * 0.5), (int)(screen.bottom * 0.5));
            DrawGLScene();
            glFlush();
              SwapBuffers(hDC);
        }

        multiplier = GetTimePassed(lasttime, average, lastmultiplier);
        camera[currentCamera].Multiplier = multiplier;
        light[currentLight].Multiplier = multiplier;

        if (key['C'] && released_key['C'] == 0)
        {
            if (currentCamera < numCameras)
                currentCamera++;
            else
                currentCamera = 0;
            released_key['C'] = 1;
        }

        if (!key['C'])
            released_key['C'] = 0;

        if (key['L'] && released_key['L'] == 0)
        {
            if (currentLight < numLights)
                currentLight++;
            else
                currentLight = 0;
            released_key['L'] = 1;
        }

        if (!key['L'])
            released_key['L'] = 0;

        if (key['I'] && released_key['I'] == 0)
        {
            DialogInUse = 1;
            lightColor[0] = light[currentLight].Ambient[0];
            lightColor[1] = light[currentLight].Ambient[1];
            lightColor[2] = light[currentLight].Ambient[2];
            ShowCursor(1);
            GetLightColor();
            key['I'] = 0;
            ShowCursor(0);
            SetCursorPos((int)(screen.right * 0.5), (int)(screen.bottom * 0.5));
            light[currentLight].Ambient[0] = lightColor[0];
            light[currentLight].Ambient[1] = lightColor[1];
            light[currentLight].Ambient[2] = lightColor[2];
            light[currentLight].Update();
            DialogInUse = 0;
        }

        if (!key['I'])
            released_key['I'] = 0;

        if (key['O'] && released_key['O'] == 0)
        {
            DialogInUse = 2;
            lightColor[0] = light[currentLight].Diffuse[0];
            lightColor[1] = light[currentLight].Diffuse[1];
            lightColor[2] = light[currentLight].Diffuse[2];
            ShowCursor(1);
            GetLightColor();
            key['O'] = 0;
            ShowCursor(0);
            SetCursorPos((int)(screen.right * 0.5), (int)(screen.bottom * 0.5));
            light[currentLight].Diffuse[0] = lightColor[0];
            light[currentLight].Diffuse[1] = lightColor[1];
            light[currentLight].Diffuse[2] = lightColor[2];
            light[currentLight].Update();
            DialogInUse = 0;
        }

        if (!key['O'])
            released_key['O'] = 0;

        if (key['P'] && released_key['P'] == 0)
        {
            DialogInUse = 3;
            lightColor[0] = light[currentLight].Specular[0];
            lightColor[1] = light[currentLight].Specular[1];
            lightColor[2] = light[currentLight].Specular[2];
            ShowCursor(1);
            GetLightColor();
            key['P'] = 0;
            ShowCursor(0);
            SetCursorPos((int)(screen.right * 0.5), (int)(screen.bottom * 0.5));
            light[currentLight].Specular[0] = lightColor[0];
            light[currentLight].Specular[1] = lightColor[1];
            light[currentLight].Specular[2] = lightColor[2];
            light[currentLight].Update();
            DialogInUse = 0;
        }

        if (!key['P'])
            released_key['P'] = 0;

        if (key[49])
        {
            step = 1.0;
        }

        if (key[50])
        {
            step = 2.0;
        }

        if (key[51])
        {
            step = 3.0;
        }

        if (key[52])
        {
            step = 4.0;
        }

        if (key[53])
        {
            step = 5.0;
        }

        if (key[54])
        {
            step = 6.0;
        }

        if (key[55])
        {
            step = 7.0;
        }

        if (key[56])
        {
            step = 8.0;
        }

        if (key[57])
        {
            step = 9.0;
        }

        if (key[VK_NUMPAD6])
        {
            light[currentLight].Movement_x += step;
        }

        if (key[VK_NUMPAD4])
        {
            light[currentLight].Movement_x -= step;
        }

        if (key[VK_NUMPAD2])
        {
            light[currentLight].Movement_z += step;
        }

        if (key[VK_NUMPAD8])
        {
            light[currentLight].Movement_z -= step;
        }

        if (key[VK_NUMPAD7])
        {
            light[currentLight].Movement_y += step;
        }

        if (key[VK_NUMPAD9])
        {
            light[currentLight].Movement_y -= step;
        }

        if (key[VK_NUMPAD5] && released_key[VK_NUMPAD5] == 0)
        {
            if (light[currentLight].Positional == FALSE)
                light[currentLight].Positional = TRUE;
            else
                light[currentLight].Positional = FALSE;
            released_key[VK_NUMPAD5] = 1;
        }

        if (!key[VK_NUMPAD5])
            released_key[VK_NUMPAD5] = 0;

        if (key[VK_RIGHT])
        {
            camera[currentCamera].Movement_x += step;
        }

        if (key[VK_LEFT])
        {
            camera[currentCamera].Movement_x -= step;
        }

        if (key[VK_DOWN])
        {
            camera[currentCamera].Movement_z += step;
        }

        if (key[VK_UP])
        {
            camera[currentCamera].Movement_z -= step;
        }

        if (key[VK_PRIOR])
        {
            camera[currentCamera].Movement_y += step;
        }

        if (key[VK_NEXT])
        {
            camera[currentCamera].Movement_y -= step;
        }

        if (key[VK_SPACE])
        {
            camera[currentCamera].Reset();
        }

        if (key[VK_ESCAPE])
            SendMessage(hWnd,WM_CLOSE,0,0);
    }
}



                                      

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