I want a light in the middle of that square and i want it to stay there when i move the camera… but why wont it apear where i put it?
#include <windows.h> #include <gl\gl.h> #include <gl\glu.h> #include <gl\glaux.h> HDC hDC=NULL; HGLRC hRC=NULL; HWND hWnd=NULL; HINSTANCE hInstance; bool keys[256]; bool active=TRUE; bool fullscreen=TRUE; GLfloat yrot; GLfloat tranx; GLfloat LightAmbient[]= { 0.3f, 0.3f, 0.3f, 1.0f }; GLfloat LightDiffuse[]= { 0.8f, 1.0f, 0.8f, 1.0f }; GLfloat LightPosition[]= { 0.0f, 2.0f, 0.0f, 1.0f }; LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); GLvoid ReSizeGLScene(GLsizei width, GLsizei height) { if (height==0) { height=1; } glViewport(0,0,width,height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); // Calculate The Aspect Ratio Of The Window gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } int InitGL(GLvoid) { glShadeModel(GL_SMOOTH); glClearColor(0.0f, 0.0f, 0.2f, 0.5f); glClearDepth(1.0f); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LEQUAL); glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient); glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse); glLightfv(GL_LIGHT1, GL_POSITION,LightPosition); glEnable(GL_LIGHT1); glEnable(GL_LIGHTING); return TRUE; } int DrawGLScene(GLvoid) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); gluLookAt(0.0f, 3.0f, -40.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f); glBegin(GL_QUADS); glVertex3f(-20.0f, -1.0f, -20.0f); glVertex3f(-20.0f, -1.0f, 20.0f); glVertex3f(20.0f, -1.0f, 20.0f); glVertex3f(20.0f, -1.0f, -20.0f); glEnd(); yrot += 5.0f; if (keys[VK_RIGHT]) { yrot += 5.0f; } if (keys[VK_LEFT]) { yrot -= 5.0f; } if (keys[VK_UP]) { tranx -= 2.0f; } return TRUE; } GLvoid KillGLWindow(GLvoid) { if (fullscreen) { ChangeDisplaySettings(NULL,0); ShowCursor(TRUE); } if (hRC) { if (!wglMakeCurrent(NULL,NULL)) { MessageBox(NULL,"Release Of DC And RC Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); } if (!wglDeleteContext(hRC)) { MessageBox(NULL,"Release Rendering Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); } hRC=NULL; } if (hDC && !ReleaseDC(hWnd,hDC)) { MessageBox(NULL,"Release Device Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); hDC=NULL; } if (hWnd && !DestroyWindow(hWnd)) { MessageBox(NULL,"Could Not Release hWnd.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); hWnd=NULL; } if (!UnregisterClass("OpenGL",hInstance)) { MessageBox(NULL,"Could Not Unregister Class.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); hInstance=NULL; } }
BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag)
{
GLuint PixelFormat;
WNDCLASS wc;
DWORD dwExStyle;
DWORD dwStyle;
RECT WindowRect;
WindowRect.left=(long)0;
WindowRect.right=(long)width;
WindowRect.top=(long)0;
WindowRect.bottom=(long)height;fullscreen=fullscreenflag;
hInstance = GetModuleHandle(NULL);
wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
wc.lpfnWndProc = (WNDPROC) WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = “OpenGL”;if (!RegisterClass(&wc))
{
MessageBox(NULL,“Failed To Register The Window Class.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}if (fullscreen)
{
DEVMODE dmScreenSettings;
memset(&dmScreenSettings,0,sizeof(dmScreenSettings));
dmScreenSettings.dmSize=sizeof(dmScreenSettings);
dmScreenSettings.dmPelsWidth = width;
dmScreenSettings.dmPelsHeight = height;
dmScreenSettings.dmBitsPerPel = bits;
dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;if (ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL) { if (MessageBox(NULL,"The Requested Fullscreen Mode Is Not Supported By
Your Video Card. Use Windowed Mode Instead?",“NeHe GL”,MB_YESNO|MB_ICONEXCLAMATION)==IDYES)
{
fullscreen=FALSE;
}
else
{MessageBox(NULL,"Program Will Now Close.","ERROR",MB_OK|MB_ICONSTOP); return FALSE; } }
}
if (fullscreen)
{
dwExStyle=WS_EX_APPWINDOW;
dwStyle=WS_POPUP;
ShowCursor(FALSE);
}
else
{
dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE;
dwStyle=WS_OVERLAPPEDWINDOW;
}AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle);
// Create The Window
if (!(hWnd=CreateWindowEx( dwExStyle,
“OpenGL”,
title,
dwStyle |
WS_CLIPSIBLINGS |
WS_CLIPCHILDREN,
0, 0,
WindowRect.right-WindowRect.left,
WindowRect.bottom-WindowRect.top,
NULL,
NULL,
hInstance,
NULL)))
{
KillGLWindow();
MessageBox(NULL,“Window Creation Error.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}static PIXELFORMATDESCRIPTOR pfd=
{
sizeof(PIXELFORMATDESCRIPTOR),
1,
PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL |
PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
bits,
0, 0, 0, 0, 0, 0,
0,
0,
0,
0, 0, 0, 0,
16,
0,
0,
PFD_MAIN_PLANE,
0,
0, 0, 0
};if (!(hDC=GetDC(hWnd)))
{
KillGLWindow();
MessageBox(NULL,“Can’t Create A GL Device Context.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd)))
{
KillGLWindow();
MessageBox(NULL,“Can’t Find A Suitable PixelFormat.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}if(!SetPixelFormat(hDC,PixelFormat,&pfd))
{
KillGLWindow();
MessageBox(NULL,“Can’t Set The PixelFormat.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}if (!(hRC=wglCreateContext(hDC)))
{
KillGLWindow();
MessageBox(NULL,“Can’t Create A GL Rendering Context.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}if(!wglMakeCurrent(hDC,hRC))
{
KillGLWindow();
MessageBox(NULL,“Can’t Activate The GL Rendering Context.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}ShowWindow(hWnd,SW_SHOW);
SetForegroundWindow(hWnd);
SetFocus(hWnd);
ReSizeGLScene(width, height);if (!InitGL())
{
KillGLWindow();
MessageBox(NULL,“Initialization Failed.”,“ERROR”,MB_OK|MB_ICONEXCLAMATION);
return FALSE;
}return TRUE;
}LRESULT CALLBACK WndProc( HWND hWnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam)
{
switch (uMsg)
{
case WM_ACTIVATE:
{
if (!HIWORD(wParam))
{
active=TRUE;
}
else
{
active=FALSE;
}return 0; } case WM_SYSCOMMAND: { switch (wParam) { case SC_SCREENSAVE: case SC_MONITORPOWER: return 0; } break; } case WM_CLOSE: { PostQuitMessage(0); return 0; } case WM_KEYDOWN: { keys[wParam] = TRUE; return 0; } case WM_KEYUP: { keys[wParam] = FALSE; return 0; } case WM_SIZE: { ReSizeGLScene(LOWORD(lParam),HIWORD(lParam)); return 0; }
}
// Pass All Unhandled Messages To DefWindowProc
return DefWindowProc(hWnd,uMsg,wParam,lParam);
}int WINAPI WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
MSG msg;
BOOL done=FALSE;// Ask The User Which Screen Mode They Prefer
if (MessageBox(NULL,“Would You Like To Run In Fullscreen Mode?”, “Start FullScreen?”,MB_YESNO|MB_ICONQUESTION)==IDNO)
{
fullscreen=FALSE;
}// Create Our OpenGL Window
if (!CreateGLWindow(“NeHe’s OpenGL Framework”,640,480,16,fullscreen))
{
return 0;
}while(!done)
{
if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
{
if (msg.message==WM_QUIT)
{
done=TRUE;
}
else
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
else
{if (active) { if (keys[VK_ESCAPE]) { done=TRUE; } else { DrawGLScene(); SwapBuffers(hDC); } } if (keys[VK_F1]) { keys[VK_F1]=FALSE; KillGLWindow(); fullscreen=!fullscreen; // Recreate Our OpenGL Window if (!CreateGLWindow("NeHe's OpenGL Framework",640,480,16,fullscreen)) { return 0; } } }
}
// Shutdown
KillGLWindow();
return (msg.wParam);
}