Hi, I’m currently using the latest stable release (not the beta) of Dev-C++ and I’m trying to teach myself OpenGl, now for some reason when i create the window, I am only getting the background and not the actual things that I draw with OpenGL. I’m working with the template included in Dev-C++. If anyone could help me or tell me what’s wrong with my code (or maybe its just WinXP?? wouldn’t surprise me…) I would be grateful & have attached the code below…
-Enemy Of Reality
// Includes
#include <windows.h>
#include <gl/gl.h>// Function Declarations
LRESULT CALLBACK
WndProc( HWND hWnd, UINT message,
WPARAM wParam, LPARAM lParam );
VOID EnableOpenGL( HWND hWnd, HDC * hDC, HGLRC * hRC );
VOID DisableOpenGL( HWND hWnd, HDC hDC, HGLRC hRC );// WinMain
int WINAPI
WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int iCmdShow )
{
WNDCLASS wc;
HWND hWnd;
HDC hDC;
HGLRC hRC;
MSG msg;
BOOL bQuit = FALSE;
float theta = 0.0f;// register window class
wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
wc.hCursor = LoadCursor( NULL, IDC_ARROW );
wc.hbrBackground = (HBRUSH)GetStockObject( BLACK_BRUSH );
wc.lpszMenuName = NULL;
wc.lpszClassName = “GLSample”;
RegisterClass( &wc );// create main window
hWnd = CreateWindow(
“GLSample”, “OpenGL Sample”,
WS_CAPTION | WS_POPUPWINDOW | WS_VISIBLE,
0, 0, 1200, 800,
NULL, NULL, hInstance, NULL );// enable OpenGL for the window
EnableOpenGL( hWnd, &hDC, &hRC );// program main loop
while ( !bQuit ) {// check for messages
if ( PeekMessage( &msg, NULL, 0, 0, PM_REMOVE ) ) {// handle or dispatch messages
if ( msg.message == WM_QUIT ) {
bQuit = TRUE;
} else {
TranslateMessage( &msg );
DispatchMessage( &msg );
}} else {
// OpenGL animation code goes here
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-1.5f,0.0f,-6.0f);
glBegin(GL_TRIANGLES); // Drawing Using Triangles
glColor3f(1.0f,0.0f,0.0f);
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();}
}
// shutdown OpenGL
DisableOpenGL( hWnd, hDC, hRC );// destroy the window explicitly
DestroyWindow( hWnd );return msg.wParam;
}
// Window Procedure
LRESULT CALLBACK
WndProc( HWND hWnd, UINT message,
WPARAM wParam, LPARAM lParam )
{switch ( message ) {
case WM_CREATE:
return 0;case WM_CLOSE:
PostQuitMessage( 0 );
return 0;case WM_DESTROY:
return 0;case WM_KEYDOWN:
switch ( wParam ) {case VK_ESCAPE:
PostQuitMessage( 0 );
return 0;}
return 0;default:
return DefWindowProc( hWnd,
message, wParam, lParam );}
}
// Enable OpenGL
VOID EnableOpenGL( HWND hWnd, HDC * hDC, HGLRC * hRC )
{
PIXELFORMATDESCRIPTOR pfd;
int iFormat;// get the device context (DC)
*hDC = GetDC( hWnd );// set the pixel format for the DC
ZeroMemory( &pfd, sizeof( pfd ) );
pfd.nSize = sizeof( pfd );
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW |
PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 24;
pfd.cDepthBits = 16;
pfd.iLayerType = PFD_MAIN_PLANE;
iFormat = ChoosePixelFormat( *hDC, &pfd );
SetPixelFormat( *hDC, iFormat, &pfd );// create and enable the render context (RC)
*hRC = wglCreateContext( *hDC );
wglMakeCurrent( *hDC, *hRC );}
// Disable OpenGL
VOID DisableOpenGL( HWND hWnd, HDC hDC, HGLRC hRC )
{
wglMakeCurrent( NULL, NULL );
wglDeleteContext( hRC );
ReleaseDC( hWnd, hDC );
}