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; }