ogl_frame_buffer_object.zip_FBO_Visual_frame buffer object_openg

//------------------------------------------------------------------------------ // Name: ogl_frame_buffer_object.cpp // Author: Kevin Harris (kevin@codesampler.com) // Last Modified: 07/06/05 // Description: This sample demonstrates how to create dynamic textures // through off-screen rendering. The off-screen rendering step // is accomplished using a frame-buffer and render-buffer // object, which is created using OpenGL's // EXT_framebuffer_object extension. // // As a demonstration, a spinning textured cube is rendered // to a frame-buffer object, which is in turn, used to create a // dynamic texture. The dynamic texture is then used to texture // a second spinning cube, which will be rendered to the // application's window. // // Control Keys: Left Mouse Button - Spin the large, black cube. // Right Mouse Button - Spin the textured cube being rendered // into the p-buffer. // // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // // Note: The EXT_framebuffer_object extension is an excellent replacement for // the WGL_ARB_pbuffer and WGL_ARB_render_texture combo which is normally // used to create dynamic textures. An example of this older technique // can be found here: // // http://www.codesampler.com/oglsrc/oglsrc_7.htm#ogl_offscreen_rendering //------------------------------------------------------------------------------ #define STRICT #define WIN32_LEAN_AND_MEAN #include <windows.h> #include <stdlib.h> #include <GL/gl.h> #include <GL/glu.h> #include <GL/glaux.h> #include "resource.h" //------------------------------------------------------------------------------ // FUNCTION POINTERS FOR OPENGL EXTENSIONS //------------------------------------------------------------------------------ // For convenience, this project ships with its own "glext.h" extension header // file. If you have trouble running this sample, it may be that this "glext.h" // file is defining something that your hardware doesn�t actually support. // Try recompiling the sample using your own local, vendor-specific "glext.h" // header file. #include "glext.h" // Sample's header file //#include <GL/glext.h> // Your local header file // EXT_framebuffer_object - http://oss.sgi.com/projects/ogl-sample/registry/EXT/framebuffer_object.txt extern PFNGLISRENDERBUFFEREXTPROC glIsRenderbufferEXT = NULL; extern PFNGLBINDRENDERBUFFEREXTPROC glBindRenderbufferEXT = NULL; extern PFNGLDELETERENDERBUFFERSEXTPROC glDeleteRenderbuffersEXT = NULL; extern PFNGLGENRENDERBUFFERSEXTPROC glGenRenderbuffersEXT = NULL; extern PFNGLRENDERBUFFERSTORAGEEXTPROC glRenderbufferStorageEXT = NULL; extern PFNGLGETRENDERBUFFERPARAMETERIVEXTPROC glGetRenderbufferParameterivEXT = NULL; extern PFNGLISFRAMEBUFFEREXTPROC glIsFramebufferEXT = NULL; extern PFNGLBINDFRAMEBUFFEREXTPROC glBindFramebufferEXT = NULL; extern PFNGLDELETEFRAMEBUFFERSEXTPROC glDeleteFramebuffersEXT = NULL; extern PFNGLGENFRAMEBUFFERSEXTPROC glGenFramebuffersEXT = NULL; extern PFNGLCHECKFRAMEBUFFERSTATUSEXTPROC glCheckFramebufferStatusEXT = NULL; extern PFNGLFRAMEBUFFERTEXTURE1DEXTPROC glFramebufferTexture1DEXT = NULL; extern PFNGLFRAMEBUFFERTEXTURE2DEXTPROC glFramebufferTexture2DEXT = NULL; extern PFNGLFRAMEBUFFERTEXTURE3DEXTPROC glFramebufferTexture3DEXT = NULL; extern PFNGLFRAMEBUFFERRENDERBUFFEREXTPROC glFramebufferRenderbufferEXT = NULL; extern PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVEXTPROC glGetFramebufferAttachmentParameterivEXT = NULL; extern PFNGLGENERATEMIPMAPEXTPROC glGenerateMipmapEXT = NULL; //------------------------------------------------------------------------------ // GLOBALS //------------------------------------------------------------------------------ HWND g_hWnd = NULL; HDC g_hDC = NULL; HGLRC g_hRC = NULL; GLuint g_testTextureID = -1; GLuint g_dynamicTextureID = -1; GLuint g_frameBuffer; GLuint g_depthRenderBuffer; int g_nWindowWidth = 640; int g_nWindowHeight = 480; const int RENDERBUFFER_WIDTH = 256; const int RENDERBUFFER_HEIGHT = 256; float g_fSpinX_L = 0.0f; float g_fSpinY_L = 0.0f; float g_fSpinX_R = 0.0f; float g_fSpinY_R = 0.0f; struct Vertex { float tu, tv; float x, y, z; }; Vertex g_cubeVertices[] = { { 0.0f,0.0f, -1.0f,-1.0f, 1.0f }, { 1.0f,0.0f, 1.0f,-1.0f, 1.0f }, { 1.0f,1.0f, 1.0f, 1.0f, 1.0f }, { 0.0f,1.0f, -1.0f, 1.0f, 1.0f }, { 1.0f,0.0f, -1.0f,-1.0f,-1.0f }, { 1.0f,1.0f, -1.0f, 1.0f,-1.0f }, { 0.0f,1.0f, 1.0f, 1.0f,-1.0f }, { 0.0f,0.0f, 1.0f,-1.0f,-1.0f }, { 0.0f,1.0f, -1.0f, 1.0f,-1.0f }, { 0.0f,0.0f, -1.0f, 1.0f, 1.0f }, { 1.0f,0.0f, 1.0f, 1.0f, 1.0f }, { 1.0f,1.0f, 1.0f, 1.0f,-1.0f }, { 1.0f,1.0f, -1.0f,-1.0f,-1.0f }, { 0.0f,1.0f, 1.0f,-1.0f,-1.0f }, { 0.0f,0.0f, 1.0f,-1.0f, 1.0f }, { 1.0f,0.0f, -1.0f,-1.0f, 1.0f }, { 1.0f,0.0f, 1.0f,-1.0f,-1.0f }, { 1.0f,1.0f, 1.0f, 1.0f,-1.0f }, { 0.0f,1.0f, 1.0f, 1.0f, 1.0f }, { 0.0f,0.0f, 1.0f,-1.0f, 1.0f }, { 0.0f,0.0f, -1.0f,-1.0f,-1.0f }, { 1.0f,0.0f, -1.0f,-1.0f, 1.0f }, { 1.0f,1.0f, -1.0f, 1.0f, 1.0f }, { 0.0f,1.0f, -1.0f, 1.0f,-1.0f } }; //------------------------------------------------------------------------------ // PROTOTYPES //------------------------------------------------------------------------------ int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow); LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam); void loadTexture(void); void init(void); void render(void); void shutDown(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 - Off-Screen Rendering Using Frame Buffer Objects", WS_OVERLAPPEDWINDOW | WS_VISIBLE, 0, 0, 640, 480, NULL, NULL, hInstance, NULL ); if( g_hWnd == NULL ) return E_FAIL; ShowWindow( g_hWnd, nCmdShow ); UpdateWindow( g_hWnd ); init(); while( uMsg.message != WM_QUIT ) { if( PeekMessage( &uMsg, NULL, 0, 0, PM_REMOVE ) ) { TranslateMessage( &uMsg ); DispatchMessage( &uMsg ); } else render(); } shutDown(); UnregisterClass( "MY_WINDOWS_CLASS", winClass.hInstance ); return uMsg.wParam; } //------------------------------------------------------------------------------ // Name: WindowProc() // Desc: The window's message handler //----------------------------------------------------------------------