home *** CD-ROM | disk | FTP | other *** search
- /*
- Name: GLSAMPLE
- Author: Blaine Hodge
- Description: OpenGL sample. Read the file Include\Gl\ReadMe.txt
- for informations on using OpenGL.
- Date: -
- Copyright: Public domain
- */
-
- // Includes
-
- #include <windows.h>
- #include <gl/gl.h>
-
- // Function Declarations
-
- 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 );
-
- // WinMain
-
- int WINAPI
- WinMain( HINSTANCE hInstance,
- HINSTANCE hPrevInstance,
- LPSTR lpCmdLine,
- int iCmdShow )
- {
- WNDCLASS wc;
- HWND hWnd;
- HDC hDC;
- HGLRC hRC;
- MSG msg;
- BOOL bQuit = FALSE;
- float theta = 0.0f;
-
- // register window class
- 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( BLACK_BRUSH );
- wc.lpszMenuName = NULL;
- wc.lpszClassName = "GLSample";
- RegisterClass( &wc );
-
- // create main window
- hWnd = CreateWindow(
- "GLSample", "OpenGL Sample",
- WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
- 0, 0, 256, 256,
- NULL, NULL, hInstance, NULL );
-
- // enable OpenGL for the window
- 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 {
-
- // 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 );
- 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;
-
- }
-
- }
-
- // shutdown OpenGL
- DisableOpenGL( hWnd, hDC, hRC );
-
- // destroy the window explicitly
- DestroyWindow( hWnd );
-
- return msg.wParam;
-
- }
-
- // Window Procedure
-
- 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;
-
- case WM_KEYDOWN:
- switch ( wParam ) {
-
- case VK_ESCAPE:
- PostQuitMessage( 0 );
- return 0;
-
- }
- return 0;
-
- default:
- return DefWindowProc( hWnd,
- message, wParam, lParam );
-
- }
-
- }
-
- // Enable OpenGL
-
- 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 );
-
- }
-
- // Disable OpenGL
-
- VOID DisableOpenGL( HWND hWnd, HDC hDC, HGLRC hRC )
- {
- wglMakeCurrent( NULL, NULL );
- wglDeleteContext( hRC );
- ReleaseDC( hWnd, hDC );
- }
-