NeHe的 OpenGL框架

/******************************************** * Object Orientated NeHeGL Using Base Class * * Author: Andreas Oberdorfer 2004 * ********************************************/ #include "NeHeGL.h" // Header File For The NeHeGL Basecode #include <gl/gl.h> // Header File For The OpenGL32 Library #include <gl/glu.h> // Header File For The GLu32 Library // Program Entry (WinMain) int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { int ret = -1; GL_Application * appl = GL_Application::Create("OpenGL"); // Create Application Class if (appl != 0) { ret = appl->Main(hInstance, hPrevInstance, lpCmdLine, nCmdShow); // Execute Main Program delete appl; // Delete Application Class } else { // Error Creating Application MessageBox(HWND_DESKTOP, "Error Creating Application Class", "Error", MB_OK | MB_ICONEXCLAMATION); } return ret; } // End Of WinMain() // Process Window Message Callbacks LRESULT CALLBACK WindowProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { LONG user_data = GetWindowLong(hWnd, GWL_USERDATA); // Load The Application Class Context if (user_data == 0) { // Application Class Context Not Available if (uMsg == WM_CREATE) // Evaluate Window Message { // Window Creation Message Received // Get Window Structure Pointer Which Contains The Application Class Context CREATESTRUCT * creation = reinterpret_cast<CREATESTRUCT *>(lParam); // Get The Application Class Context GL_Application * appl = reinterpret_cast<GL_Application *>(creation->lpCreateParams); // Store The Application Class Context SetWindowLong(hWnd, GWL_USERDATA, reinterpret_cast<LONG>(appl)); appl->m_IsVisible = true; // Set Visible To true return 0; // Return } } else { // Get The Application Class Context GL_Application * appl = reinterpret_cast<GL_Application *>(user_data); return appl->Message(hWnd, uMsg, wParam, lParam); // Call Class Message Handler } return DefWindowProc(hWnd, uMsg, wParam, lParam); // Pass Unhandled Messages To DefWindowProc } // Initialize Class Default Values GL_Application::GL_Application(const char * class_name) // Class Constructor { m_ClassName = class_name; // Store Class Name m_IsProgramLooping = true; // Program Looping Is Set To true m_CreateFullScreen = true; // Enable FullScreen Mode m_IsVisible = false; m_ResizeDraw = false; // Disable Redraw During Window Resize m_LastTickCount = 0; } void GL_Application::ToggleFullscreen() // Toggle Fullscreen / Windowed { PostMessage(m_Window, WM_TOGGLEFULLSCREEN, 0, 0); // Send A WM_TOGGLEFULLSCREEN Message } void GL_Application::TerminateApplication() // Terminate The Application { PostMessage(m_Window, WM_QUIT, 0, 0); // Send A WM_QUIT Message m_IsProgramLooping = false; // Stop Looping Of The Program } // Message Handler LRESULT GL_Application::Message(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) { switch (uMsg) // Evaluate Window Message { case WM_SYSCOMMAND: // Intercept System Commands switch (wParam) // Check System Calls { case SC_SCREENSAVE: // Screensaver Trying To Start? case SC_MONITORPOWER: // Monitor Trying To Enter Powersave? return 0; // Prevent From Happening break; } break; // Exit case WM_CLOSE: // Closing The Window TerminateApplication(); // Terminate The Application return 0; // Return break; case WM_EXITMENULOOP: case WM_EXITSIZEMOVE: m_LastTickCount = GetTickCount(); // Refresh Last Tick Count return 0; break; case WM_MOVE: m_Window.SetPosX(LOWORD(lParam)); // Set Window - LoWord = X Position m_Window.SetPosY(HIWORD(lParam)); // Set Window - HiWord = Y Position return 0; break; case WM_PAINT: if (m_ResizeDraw == true) // Is Draw Option Enabled { m_Window.ReshapeGL(); // Reshape Window Draw(); // Redraw Scene m_Window.SwapBuffers(); // Swap Buffers } break; case WM_SIZING: { RECT * rect = (RECT *)lParam; m_Window.SetWidth(rect->right - rect->left); // Set Window - LoWord = Width m_Window.SetHeight(rect->bottom - rect->top); // Set Window - HiWord = Height return TRUE; } break; case WM_SIZE: // Size Action Has Taken Place switch (wParam) // Evaluate Size Action { case SIZE_MINIMIZED: // Was Window Minimized? m_IsVisible = false; // Set Visible To false return 0; // Return break; case SIZE_MAXIMIZED: // Was Window Maximized? case SIZE_RESTORED: // Was Window Restored? m_IsVisible = true; // Set Visible To true m_Window.SetWidth(LOWORD(lParam)); // Set Window - LoWord = Width m_Window.SetHeight(HIWORD(lParam)); // Set Window - HiWord = Height m_Window.ReshapeGL(); // Reshape Window m_LastTickCount = GetTickCount(); // Refresh Last Tick Count return 0; // Return break; } break; // Break case WM_KEYDOWN: // Update Keyboard Buffers For Keys Pressed m_Keys.SetPressed(wParam); // Set The Selected Key (wParam) To Pressed return 0; // Return break; case WM_KEYUP: // Update Keyboard Buffers For Keys Released m_Keys.SetReleased(wParam); // Set The Selected Key (wParam) To Released return 0; // Return break; case WM_TOGGLEFULLSCREEN: // Toggle FullScreen Mode On / Off m_CreateFullScreen = !m_CreateFullScreen; PostMessage(hWnd, WM_QUIT, 0, 0); break; // Break } return DefWindowProc(hWnd, uMsg, wParam, lParam); // Pass Unhandled Messages To DefWindowProc } // Program Main Loop int GL_Application::Main(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { // Register A Class For Our Window To Use WNDCLASSEX windowClass; // Window Class ZeroMemory(&windowClass, sizeof(WNDCLASSEX)); // Make Sure Memory Is Cleared windowClass.cbSize = sizeof(WNDCLASSEX); // Size Of The windowClass Structure windowClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // Redraws The Window For Any Movement / Resizing windowClass.lpfnWndProc = (WNDPROC)(WindowProc); // WindowProc Handles Messages windowClass.hInstance = hInstance; // Set The Instance windowClass.hbrBackground = (HBRUSH)(COLOR_APPWORKSPACE); // Class Background Brush Color windowClass.hCursor = LoadCursor(NULL, IDC_ARROW); // Load The Arrow Pointer windowClass.lpszClassName = m_ClassName; // Sets The Applications Classname if (RegisterClassEx(&windowClass) == 0) // Did Registering The Class Fail? { // NOTE: Failure, Should Never Happen MessageBox(HWND_DESKTOP, "Error Registering Window Class!", "Error", MB_OK | MB_ICONEXCLAMATION); return -1; // Terminate Application } // Ask The User If They Want To Start In FullScreen Mode? if (MessageBox(HWND_DESKTOP, "Would You Like To Run In Fullscreen Mode ?", "Start FullScreen ?", MB_YESNO | MB_ICONQUESTION) == IDNO) { m_CreateFullScreen = false; // m_CreateFullScreen Is Set To User Default } while (m_IsProgramLooping) // Loop Until WM_QUIT Is Received { // Create A Window if (m_Window.Create("GL Framework", m_CreateFullScreen, m_ClassName, hInstance, this) == true) { // At This Point We Should Have A Window That Is