glsl teapot 简单演示

/***************************************************************************************************** * File name: Game.cpp * Create time: 2012/04/20 * Module: View * Author: zengqh * Blog: http://blog.csdn.net/aimyton * --------------------------------------------------------------------------------------------------- * Memo: * *****************************************************************************************************/ #include "../State/WorldState.h" #include "Game.h" /***************************************************************************************************** * Macro and Struct definition *****************************************************************************************************/ /***************************************************************************************************** * Global variables *****************************************************************************************************/ extern HINSTANCE HInstance; Game* Instance = NULL; /***************************************************************************************************** * Global function declare *****************************************************************************************************/ /***************************************************************************************************** * Global function definition *****************************************************************************************************/ /***************************************************************************************************** * Class declare ******************************************************************************************************/ /***************************************************************************************************** * Class definition *****************************************************************************************************/ Game::Game() : m_surface_width(800) , m_surface_height(480) , m_curr_state(NULL) , m_should_exit_game(false) { Instance = this; } Game::~Game() { } bool Game::Initalize() { if(!initDriver()) return false; m_curr_state = new WorldState(m_surface_width, m_surface_height, m_hdc); m_curr_state->Enter(); return true; } bool Game::UnInitialize() { m_curr_state->Exit(); safe_delete(m_curr_state); return true; } LRESULT CALLBACK Game::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) { switch( msg ) { case WM_DESTROY: ::PostQuitMessage(0); return 0; case WM_SIZE: Instance->reSizeGLScene(LOWORD(lParam),HIWORD(lParam)); } return ::DefWindowProc(hwnd, msg, wParam, lParam); } bool Game::Loop() { handleMessage(); return true; } void Game::handleMessage() { MSG msg; ::ZeroMemory(&msg, sizeof(MSG)); static f32 lastTime = (f32)timeGetTime(); while(msg.message != WM_QUIT) { if(m_should_exit_game) { PostMessage(m_hwnd, WM_QUIT, 0, 0); } if(::PeekMessage(&msg, 0, 0, 0, PM_REMOVE)) { ::TranslateMessage(&msg); ::DispatchMessage(&msg); } else { f32 timeLog=1.0f / 100.0f; f32 currTime =(f32)timeGetTime(); f32 timeDelta =(currTime-lastTime) * 0.001f; if(timeDelta < timeLog) { f32 sleep=1000 * (timeLog - timeDelta); Sleep((u32)sleep); } currTime =(f32)timeGetTime(); timeDelta =(currTime-lastTime) * 0.001f; gameLoop(timeDelta); lastTime = currTime; } } } void Game::gameLoop(f32 time_delta) { m_curr_state->Update(1000 * time_delta); frameStarted(); render(); frameEnded(); swap(); } void Game::frameStarted() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); } void Game::render() { m_curr_state->Render(); } void Game::frameEnded() { glFlush(); } void Game::swap() { SwapBuffers(m_hdc); } bool Game::initDriver() { createGLWindow(); return true; } /* from nehe lesson */ bool Game::createGLWindow() { GLuint PixelFormat; // Holds The Results After Searching For A Match WNDCLASS wc; // Windows Class Structure DWORD dwExStyle; // Window Extended Style DWORD dwStyle; // Window Style RECT WindowRect; // Grabs Rectangle Upper Left / Lower Right Values WindowRect.left=(long)0; // Set Left Value To 0 WindowRect.right=(long)m_surface_width; // Set Right Value To Requested Width WindowRect.top=(long)0; // Set Top Value To 0 WindowRect.bottom=(long)m_surface_height; // Set Bottom Value To Requested Height wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // Redraw On Size, And Own DC For Window. wc.lpfnWndProc = (WNDPROC) WndProc; // WndProc Handles Messages wc.cbClsExtra = 0; // No Extra Window Data wc.cbWndExtra = 0; // No Extra Window Data wc.hInstance = HInstance; // Set The Instance wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); // Load The Default Icon wc.hCursor = LoadCursor(NULL, IDC_ARROW); // Load The Arrow Pointer wc.hbrBackground = NULL; // No Background Required For GL wc.lpszMenuName = NULL; // We Don't Want A Menu wc.lpszClassName = "OpenGL"; // Set The Class Name if (!RegisterClass(&wc)) // Attempt To Register The Window Class { MessageBox(NULL,"Failed To Register The Window Class.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; // Window Extended Style dwStyle=WS_OVERLAPPEDWINDOW; // Windows Style AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle); // Adjust Window To True Requested Size // Create The Window if (!(m_hwnd=CreateWindowEx( dwExStyle, // Extended Style For The Window "OpenGL", // Class Name "fighter demo", dwStyle | // Defined Window Style WS_CLIPSIBLINGS | // Required Window Style WS_CLIPCHILDREN, // Required Window Style 0, 0, // Window Position WindowRect.right-WindowRect.left, // Calculate Window Width WindowRect.bottom-WindowRect.top, // Calculate Window Height NULL, // No Parent Window NULL, // No Menu HInstance, // Instance NULL))) // Dont Pass Anything To WM_CREATE { MessageBox(NULL,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE } static PIXELFORMATDESCRIPTOR pfd= // pfd Tells Windows How We Want Things To Be { sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor 1, // Version Number PFD_DRAW_TO_WINDOW | // Format Must Support Window PFD_SUPPORT_OPENGL | // Format Must Support OpenGL PFD_DOUBLEBUFFER, // Must Support Double Buffering PFD_TYPE_RGBA, // Request An RGBA Format 16, // Select Our Color Depth 0, 0, 0, 0, 0, 0, // Color Bits Ignored 0, // No Alpha Buffer 0, // Shift Bit Ignored 0, // No Accumulation Buffer 0, 0, 0, 0, // Accumulation Bits Ignored 16, // 16Bit Z-Buffer (Depth Buffer) 0, // No Stencil Buffer 0, // No Auxiliary Buffer PFD_MAIN_PLANE, // Main Drawing Layer 0, // Reserved 0, 0, 0 // Layer Masks Ignored }; if (!(m_hdc=GetDC(m_hwnd))) // Did We Get A Device Context? { MessageBox(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION); return false; // Return FALSE