BOOL dglInit();
BOOL dlgUnInit();

typedef void (*LPFNGETSTRINGLENGTH1)(GLenum mode);

//typedef int     (_cdecl* LPFNGETSTRINGLENGTH1)      (PCWSTR);

//void (*glBegin)(GLenum mode);

//void glBegin(GLenum mode);

//extern lpfnGetStringLength1 glBegin;
void (*glEnd)();

#include <windows.h>
#include "dgl.h"

HMODULE GLHandle = NULL;
//typedef void (*PFNSOMEFUNC)(GLenum mode);
//typedef void (*LPFNGETSTRINGLENGTH1)(GLenum mode);
//PROC WINAPI(*winglGetProcAddress)(LPCSTR);

BOOL dglInit(){
	GLHandle = LoadLibrary("opengl32.dll");

	//DIRECT3DCREATE9 Direct3DCreate9;
	//Direct3DCreate9 = (DIRECT3DCREATE9) GetProcAddress(library,"Direct3DCreate9");

	if (GLHandle != NULL){
		LPFNGETSTRINGLENGTH1 lpfnGetStringLength1 = (LPFNGETSTRINGLENGTH1) GetProcAddress(GLHandle, "glBegin");


		
		// glBegin  = (PROC WINAPI(*)(LPCSTR))GetProcAddress(GLHandle, "glBegin");
	
	}
	// TODO: del
	else 
		MessageBox(0, "Error load opengl32.dll !", "Error", MB_ICONERROR);
	return GLHandle != NULL;
}

BOOL dlgUnInit(){
	//CloseHandle(hgl);
	return FreeLibrary(GLHandle);
}

#pragma region Includes and defines

#define WINVER 0x0500   // version 5.0, XP
#define gldynamic	// use dynamic OpenGL

#include <windows.h>

#ifdef gldynamic
	#include "dgl.h"
#else 
	#include <gl\GL.h>
#endif

#pragma endregion


LRESULT CALLBACK WindowProc(HWND, UINT, WPARAM, LPARAM);
void EnableOpenGL(HWND hwnd, HDC*, HGLRC*);
void DisableOpenGL(HWND, HDC, HGLRC);

int DrawGLScene1(GLvoid);

HDC	hDC = NULL;		// Private GDI Device Context
float theta;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASSEX wcex;
    HWND hwnd;
    // HDC hDC;
    HGLRC hRC;
    MSG msg;
    BOOL bQuit = FALSE;
    float theta = 0.0f;

    /* register window class */
    wcex.cbSize = sizeof(WNDCLASSEX);
    wcex.style = CS_OWNDC;
    wcex.lpfnWndProc = WindowProc;
    wcex.cbClsExtra = 0;
    wcex.cbWndExtra = 0;
    wcex.hInstance = hInstance;
    wcex.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wcex.lpszMenuName = NULL;
    wcex.lpszClassName = "GLSample";
    wcex.hIconSm = LoadIcon(NULL, IDI_APPLICATION);;


    if (!RegisterClassEx(&wcex))
        return 0;

    /* create main window */
    hwnd = CreateWindowEx(0,
                          "GLSample",
                          "OpenGL Sample",
                          WS_OVERLAPPEDWINDOW,
                          CW_USEDEFAULT,
                          CW_USEDEFAULT,
                          256,
                          256,
                          NULL,
                          NULL,
                          hInstance,
                          NULL);

    ShowWindow(hwnd, nCmdShow);

    /* enable OpenGL for the window */
	dglInit();
	//glBegin();

    EnableOpenGL(hwnd, &hDC, &hRC);

    /* program main loop */
    while (!bQuit)
    {
        /* check for messages */
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            /* handle or dispatch messages */
            if (msg.message == WM_QUIT)
            {
                bQuit = TRUE;
            }
            else
            {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
            }
        }
        else
        {
			DrawGLScene1();
        }
    }

    /* shutdown OpenGL */
    DisableOpenGL(hwnd, hDC, hRC);

    /* destroy the window explicitly */
    DestroyWindow(hwnd);

    return msg.wParam;
}

int DrawGLScene1(GLvoid)		// Here's Where We Do All The Drawing
{
            /* OpenGL animation code goes here */

/*
            glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
            glClear(GL_COLOR_BUFFER_BIT);

            glPushMatrix();
            glRotatef(theta, 0.0f, 0.0f, 1.0f);

			glRotatef(theta, 1.0f+theta,0.0f, -6.0f+theta);  
*/
//	MYPROC("dffsf");
			lpfnGetStringLength1(GL_TRIANGLES);	// no work
			glBegin(GL_TRIANGLES);				// i wont this use, no work... how fix???
            //glBegin(GL_TRIANGLES);		
//                glColor3f(1.0f, 0.0f, 0.0f);   glVertex2f(0.0f,   1.0f);
//                glColor3f(0.0f, 1.0f, 0.0f);   glVertex2f(0.87f,  -0.5f);
//                glColor3f(0.0f, 0.0f, 1.0f);   glVertex2f(-0.87f, -0.5f);		
            //glEnd();

/*
            glPopMatrix();

            SwapBuffers(hDC);
*/
            theta += 1.0f;
            Sleep (1);

	return TRUE;
}

void EnableOpenGL(HWND hwnd, HDC* hDC, HGLRC* hRC)
{
    PIXELFORMATDESCRIPTOR pfd;

    int iFormat;

    /* get the device context (DC) */
    *hDC = GetDC(hwnd);

    /* set the pixel format for the DC */
    ZeroMemory(&pfd, sizeof(pfd));

    pfd.nSize = sizeof(pfd);
    pfd.nVersion = 1;
    pfd.dwFlags = PFD_DRAW_TO_WINDOW |
                  PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
    pfd.iPixelType = PFD_TYPE_RGBA;
    pfd.cColorBits = 24;
    pfd.cDepthBits = 16;
    pfd.iLayerType = PFD_MAIN_PLANE;

    iFormat = ChoosePixelFormat(*hDC, &pfd);

    SetPixelFormat(*hDC, iFormat, &pfd);

    /* create and enable the render context (RC) */
    *hRC = wglCreateContext(*hDC);

    wglMakeCurrent(*hDC, *hRC);
}

void DisableOpenGL (HWND hwnd, HDC hDC, HGLRC hRC)
{
    wglMakeCurrent(NULL, NULL);
    wglDeleteContext(hRC);
    ReleaseDC(hwnd, hDC);
}

LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
        case WM_CLOSE:
            PostQuitMessage(0);
        break;

        case WM_DESTROY:
            return 0;

        case WM_KEYDOWN:
        {
            switch (wParam)
            {
                case VK_ESCAPE:
                    PostQuitMessage(0);
                break;
            }
        }
        break;

        default:
            return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }

    return 0;
}

typedef void (*LPFNGETSTRINGLENGTH1)(GLenum mode);

typedef void (WINAPI *LPFNGETSTRINGLENGTH1)(GLenum mode);