ogl_cg_simple.rar_Cg_Cg_simp_ogl__ogl_cg_simple_opengl

//----------------------------------------------------------------------------- // Name: ogl_cg_simple.cpp // Author: Kevin Harris // Last Modified: 04/21/05 // Description: This sample demonstrates how to write a CG style shader // with OpenGL //----------------------------------------------------------------------------- #define STRICT #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <GL/gl.h> #include <GL/glu.h> #include <Cg/Cg.h> #include <Cg/cgGL.h> #include "resource.h" //----------------------------------------------------------------------------- // GLOBALS //----------------------------------------------------------------------------- HDC g_hDC = NULL; HGLRC g_hRC = NULL; HWND g_hWnd = NULL; HINSTANCE g_hInstance = NULL; CGprofile g_CGprofile; CGcontext g_CGcontext; CGprogram g_CGprogram; CGparameter g_CGparam_constColor; float g_fSpinX = 0.0f; float g_fSpinY = 0.0f; struct Vertex { float r, g, b; float x, y, z; }; Vertex g_quadVertices[] = { // r g b x y z { 1.0f,1.0f,0.0f, -1.0f,-1.0f, 0.0f }, { 1.0f,0.0f,0.0f, 1.0f,-1.0f, 0.0f }, { 0.0f,1.0f,0.0f, 1.0f, 1.0f, 0.0f }, { 0.0f,0.0f,1.0f, -1.0f, 1.0f, 0.0f }, }; //----------------------------------------------------------------------------- // PROTOTYPES //----------------------------------------------------------------------------- int WINAPI WinMain(HINSTANCE g_hInstance,HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow); LRESULT CALLBACK WindowProc(HWND g_hWnd, UINT msg, WPARAM wParam, LPARAM lParam); void init(void); void render(void); void shutDown(void); void initShader(void); //----------------------------------------------------------------------------- // Name: WinMain() // Desc: The application's entry point //----------------------------------------------------------------------------- int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow ) { WNDCLASSEX winClass; MSG uMsg; memset(&uMsg,0,sizeof(uMsg)); winClass.lpszClassName = "MY_WINDOWS_CLASS"; winClass.cbSize = sizeof(WNDCLASSEX); winClass.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; winClass.lpfnWndProc = WindowProc; winClass.hInstance = hInstance; winClass.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_OPENGL_ICON); winClass.hIconSm = LoadIcon(hInstance, (LPCTSTR)IDI_OPENGL_ICON); winClass.hCursor = LoadCursor(NULL, IDC_ARROW); winClass.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH); winClass.lpszMenuName = NULL; winClass.cbClsExtra = 0; winClass.cbWndExtra = 0; if( !RegisterClassEx(&winClass) ) return E_FAIL; g_hWnd = CreateWindowEx( NULL,"MY_WINDOWS_CLASS", "OpenGL - Simple Vertex Shader Using CG",WS_OVERLAPPEDWINDOW, 0,0, 640,480, NULL, NULL, g_hInstance, NULL ); if( g_hWnd == NULL ) return E_FAIL; ShowWindow( g_hWnd, nCmdShow ); UpdateWindow( g_hWnd ); init(); initShader(); while( uMsg.message != WM_QUIT ) { if( PeekMessage( &uMsg, NULL, 0, 0, PM_REMOVE ) ) { TranslateMessage( &uMsg ); DispatchMessage( &uMsg ); } else render(); } shutDown(); UnregisterClass( "MY_WINDOWS_CLASS", g_hInstance ); return uMsg.wParam; } //----------------------------------------------------------------------------- // Name: WindowProc() // Desc: The window's message handler //----------------------------------------------------------------------------- LRESULT CALLBACK WindowProc( HWND g_hWnd, UINT msg, WPARAM wParam, LPARAM lParam ) { static POINT ptLastMousePosit; static POINT ptCurrentMousePosit; static bool bMousing; switch( msg ) { case WM_KEYDOWN: { switch( wParam ) { case VK_ESCAPE: PostQuitMessage(0); break; } } break; case WM_LBUTTONDOWN: { ptLastMousePosit.x = ptCurrentMousePosit.x = LOWORD (lParam); ptLastMousePosit.y = ptCurrentMousePosit.y = HIWORD (lParam); bMousing = true; } break; case WM_LBUTTONUP: { bMousing = false; } break; case WM_MOUSEMOVE: { ptCurrentMousePosit.x = LOWORD (lParam); ptCurrentMousePosit.y = HIWORD (lParam); if( bMousing ) { g_fSpinX -= (ptCurrentMousePosit.x - ptLastMousePosit.x); g_fSpinY -= (ptCurrentMousePosit.y - ptLastMousePosit.y); } ptLastMousePosit.x = ptCurrentMousePosit.x; ptLastMousePosit.y = ptCurrentMousePosit.y; } break; case WM_SIZE: { int nWidth = LOWORD(lParam); int nHeight = HIWORD(lParam); glViewport(0, 0, nWidth, nHeight); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective( 45.0, (GLdouble)nWidth / (GLdouble)nHeight, 0.1, 100.0); } break; case WM_CLOSE: { PostQuitMessage(0); } case WM_DESTROY: { PostQuitMessage(0); } break; default: { return DefWindowProc( g_hWnd, msg, wParam, lParam ); } break; } return 0; } //----------------------------------------------------------------------------- // Name: init() // Desc: //----------------------------------------------------------------------------- void init( void ) { GLuint PixelFormat; PIXELFORMATDESCRIPTOR pfd; memset(&pfd, 0, sizeof(PIXELFORMATDESCRIPTOR)); pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR); pfd.nVersion = 1; pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; pfd.iPixelType = PFD_TYPE_RGBA; pfd.cColorBits = 16; pfd.cDepthBits = 16; g_hDC = GetDC( g_hWnd ); PixelFormat = ChoosePixelFormat( g_hDC, &pfd ); SetPixelFormat( g_hDC, PixelFormat, &pfd ); g_hRC = wglCreateContext( g_hDC ); wglMakeCurrent( g_hDC, g_hRC ); glEnable( GL_TEXTURE_2D ); glEnable( GL_DEPTH_TEST ); glClearColor( 0.0f, 0.0f, 0.0f, 1.0f ); glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective( 45.0f, 640.0f / 480.0f, 0.1f, 100.0f ); } //----------------------------------------------------------------------------- // Name: initShader() // Desc: Load the CG shader //----------------------------------------------------------------------------- void initShader( void ) { // // Search for a valid vertex shader profile in this order: // // CG_PROFILE_ARBVP1 - GL_ARB_vertex_program // CG_PROFILE_VP40 - GL_ARB_vertex_program + GL_NV_vertex_program3 // if( cgGLIsProfileSupported(CG_PROFILE_ARBVP1) ) g_CGprofile = CG_PROFILE_ARBVP1; else if( cgGLIsProfileSupported(CG_PROFILE_VP40) ) g_CGprofile = CG_PROFILE_VP20; else { MessageBox( NULL,"Failed to initialize vertex shader! Hardware doesn't " "support any of the required vertex shading extensions!", "ERROR",MB_OK|MB_ICONEXCLAMATION ); return; } // Create the context... g_CGcontext = cgCreateContext(); // // Create the vertex shader... // g_CGprogram = cgCreateProgramFromFile( g_CGcontext, CG_SOURCE, "ogl_cg_simple.cg", g_CGprofile, NULL, NULL ); // // Load the program using Cg's expanded interface... // cgGLLoadProgram( g_CGprogram ); // // Bind some parameters by name so we can set them later... // g_CGparam_constColor = cgGetNamedParameter(g_CGprogram, "constColor"); } //----------------------------------------------------------------------------- // Name: shutDown() // Desc: //----------------------------------------------------------------------------- void shutDown( void ) { cgDestr