Please help me find the error in this code. I’m new to opengl and wrote this following nehe’s tutorial. When I compile it in Borland C++ builder 5.0 it doesn’t draw the triangle and the plane. When I compile in Dev-C++ 5 it says that the app has encountered an error and needs to be closed.
I downloaded and compiled the VC++6 source file and it compiled well on both compilers.
//---------------------------------------------------------------------------
#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>//---------------------------------------------------------------------------
// Global variablesHGLRC hRC;
HDC hDC;
HWND main;
HINSTANCE hInstance;bool fullscreen = false;
bool active = false;
bool keys[256];const char classname = “StandartClass”;
//---------------------------------------------------------------------------
// Function declarationsLRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
//---------------------------------------------------------------------------
// All functions except for WinMain
//---------------------------------------------------------------------------GLvoid ResizeGLWindow(GLsizei width, GLsizei height)
{
if (height == 0) height = 1;
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(0.45f, (GLfloat)width/(GLfloat)height, 0.1f, 100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}//---------------------------------------------------------------------------
int InitGL(GLvoid)
{
glShadeModel(GL_SMOOTH);
glClearColor(0.0f, 0.0f, 0.7f, 0.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
return true;
}//---------------------------------------------------------------------------
GLvoid DrawGLScene(GLvoid)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-1.5f, 0.0f, -6.0f);
glBegin(GL_TRIANGLES); // Drawing Using Triangles
glVertex3f( 0.0f, 1.0f, 0.0f); // Top
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glEnd();
glTranslatef(3.0f, 0.0f, 0.0f);
glBegin(GL_QUADS); // Draw A Quad
glVertex3f(-1.0f, 1.0f, 0.0f); // Top Left
glVertex3f( 1.0f, 1.0f, 0.0f); // Top Right
glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right
glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left
glEnd();
}//---------------------------------------------------------------------------
GLvoid KillGLWindow(GLvoid)
{
if (fullscreen)
{
ChangeDisplaySettings(NULL, 0);
ShowCursor(true);
}
if(hRC)
{
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
}
hRC = NULL;
if(hDC && !ReleaseDC(main, hDC)) hDC = NULL;
if(main && !DestroyWindow(main)) main = NULL;
if(!UnregisterClass(classname, hInstance))hInstance = NULL;}
//---------------------------------------------------------------------------
bool CreateGLWindow(const char * title, UINT width, UINT height, UINT bits, bool fullscreenflag)
{
GLuint PixelFormat;
WNDCLASS wc;
DWORD dwStyle;
DWORD dwExStyle;RECT WndRect; WndRect.left = 0; WndRect.top = 0; WndRect.right = width; WndRect.bottom = height; fullscreen = fullscreenflag; hInstance = GetModuleHandle(NULL); wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; wc.hIcon = LoadIcon(NULL, IDI_APPLICATION); wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.cbClsExtra = 0; wc.cbWndExtra = 0; wc.lpfnWndProc = WndProc; wc.lpszMenuName = NULL; wc.lpszClassName = classname; wc.hInstance = hInstance; wc.hbrBackground = (HBRUSH) (COLOR_WINDOW+1); RegisterClass(&wc); if(fullscreen) { DEVMODE dmScreenSettings; memset(&dmScreenSettings, 0, sizeof(dmScreenSettings)); dmScreenSettings.dmSize = sizeof(dmScreenSettings); dmScreenSettings.dmBitsPerPel = bits; dmScreenSettings.dmPelsWidth = width; dmScreenSettings.dmPelsHeight = height; dmScreenSettings.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT; if(ChangeDisplaySettings(&dmScreenSettings, CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL) fullscreen = false; } if (fullscreen) { dwExStyle = WS_EX_APPWINDOW; dwStyle = WS_POPUP; ShowCursor(false); } else { dwStyle = WS_OVERLAPPED; dwExStyle = WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; AdjustWindowRectEx(&WndRect, dwStyle, false, dwExStyle); }; main = CreateWindowEx(dwExStyle, classname, title, dwStyle, 0, 0, width, height, NULL, NULL, hInstance, NULL); if(!main) { KillGLWindow(); 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 }; hDC = GetDC(main); if(!hDC) { KillGLWindow(); return false; }; PixelFormat = ChoosePixelFormat(hDC, &pfd); if(!PixelFormat) { KillGLWindow(); return false; }; if(!SetPixelFormat(hDC, PixelFormat, &pfd)) { KillGLWindow(); return false; }; hRC = wglCreateContext(hDC); if(!hRC) { KillGLWindow(); return false; }; if(!wglMakeCurrent(hDC, hRC)) { KillGLWindow(); return false; }; ShowWindow(main, 1); SetForegroundWindow(main); SetFocus(main); ResizeGLWindow(width, height); if(!InitGL()) { KillGLWindow(); return false; } return true;}
//---------------------------------------------------------------------------
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
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:
{
ResizeGLWindow(LOWORD(lParam), HIWORD(lParam));
return 0;
}
}
return DefWindowProc(hwnd, msg, wParam, lParam);
}//---------------------------------------------------------------------------
WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
bool done;
MSG msg;if(MessageBox(NULL, "Do you want to run the application in fullscreen mode (recommended)?", "Freescape 2002 :: Question", MB_YESNO | MB_ICONQUESTION)==IDYES)fullscreen = true; if(!CreateGLWindow("Freescape 2002", 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; if(!CreateGLWindow("Freescape 2002", 640, 480, 16, fullscreen)) { return 0; }; } } }; KillGLWindow(); return msg.wParam;}
//---------------------------------------------------------------------------
