Opengl and Win32

1.create a wndclass

2.regist your wndclass and return a HWND

3.get a HDC from the HWND

4.set the pixelformat uesd by the HDC

5.get a HGLRC from the HDC

6.wglMakeCurrent(*HDC,*HGLRC)

opengl api use the HGLRC to communicate with the windows

MyHeader.h

#include <Windows.h>
#include <gl/GL.h>
// Function Declarations
HWND GetHWND(HINSTANCE);
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC);
void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC);

GetHWND.c

#include "MyHeader.h"
HWND GetHWND(HINSTANCE hInstance)
{
WNDCLASS wc;
wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = TEXT("GLSample");
if (!RegisterClass(&wc)) {
MessageBox(NULL,TEXT("This program requires Windows NT!"),TEXT("ERROR"),MB_ICONERROR);
return 0;
}
// create main window
return  (CreateWindow(
TEXT("GLSample"),TEXT("OpenGL Sample"),
WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
0, 0, 512, 512,
NULL, NULL, hInstance, NULL ));
}

En_DisOpengl.c

#include "MyHeader.h"
void EnableOpenGL(HWND hWnd, HDC * hDC, HGLRC * hRC)
{
PIXELFORMATDESCRIPTOR pfd;
int format;
// 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;
format = ChoosePixelFormat( *hDC, &pfd );
SetPixelFormat( *hDC, format, &pfd );
// create and enable the render context (RC)
*hRC = wglCreateContext( *hDC );
wglMakeCurrent( *hDC, *hRC );
}
// Disable OpenGL
void DisableOpenGL(HWND hWnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent( NULL, NULL );
wglDeleteContext( hRC );
ReleaseDC( hWnd, hDC );
}

WndProc.c

#include "MyHeader.h"
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_CREATE:
return 0;
case WM_CLOSE:
PostQuitMessage( 0 );
return 0;
case WM_DESTROY:
return 0;
default:
return DefWindowProc( hWnd, message, wParam, lParam );
}
}

Main.c

#include "MyHeader.h"
// WinMain
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int iCmdShow)
{
HWND hWnd;
HDC hDC;
HGLRC hRC;
MSG msg;
hWnd=GetHWND(hInstance);
// enable OpenGL for the window
EnableOpenGL( hWnd, &hDC, &hRC );
glClearColor( 0.0f, 0.0f, 0.0f, 0.0f );
glClear( GL_COLOR_BUFFER_BIT );
SwapBuffers( hDC );
// program main loop
while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
// shutdown OpenGL
DisableOpenGL( hWnd, hDC, hRC );
// destroy the window explicitly
DestroyWindow( hWnd );
return msg.wParam;
}