Code:
#include <windows.h>
#include <gl/gl.h>
#define WIDTH 1024
#define HEIGHT 768
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);
int WINAPI WinMain (HINSTANCE inst, HINSTANCE pinst, char *cmd, int cs)
{
WNDCLASS wc;
HWND hwnd;
HDC hdc;
HGLRC hrc;
MSG msg;
DEVMODE dmScreenSettings;
// register window class
wc.style = CS_OWNDC;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = inst;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = NULL;
wc.lpszMenuName = NULL;
wc.lpszClassName = "GLSample";
RegisterClass (&wc);
// create main window
hwnd = CreateWindowEx(WS_EX_APPWINDOW,
"GLSample", "OpenGL Sample",
WS_POPUP | WS_CLIPSIBLINGS,
0, 0, WIDTH, HEIGHT,
NULL, NULL, inst, NULL);
memset(&dmScreenSettings,0,sizeof(dmScreenSettings));
dmScreenSettings.dmSize = sizeof(dmScreenSettings);
dmScreenSettings.dmPelsWidth = WIDTH;
dmScreenSettings.dmPelsHeight = HEIGHT;
dmScreenSettings.dmBitsPerPel = 16;
dmScreenSettings.dmFields = DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;
ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN);
/* enable OpenGL for the window */
EnableOpenGL(hwnd, &hdc, &hrc);
/* program main loop */
while (1)
{
/* check for messages */
if (PeekMessage (&msg, NULL, 0, 0, PM_REMOVE))
{
/* handle or dispatch messages */
if (msg.message == WM_QUIT)
{
break;
}
else
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}
}
else
{
/* OpenGL animation code goes here */
glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
glClear (GL_COLOR_BUFFER_BIT);
glPushMatrix ();
glRotatef (0, 0.0f, 0.0f, 1.0f);
glBegin (GL_TRIANGLES);
glColor3f (1.0f, 0.0f, 0.0f); glVertex2f (0.0f, 1.0f);
glColor3f (0.0f, 1.0f, 0.0f); glVertex2f (0.87f, -0.5f);
glColor3f (0.0f, 0.0f, 1.0f); glVertex2f (-0.87f, -0.5f);
glEnd ();
glPopMatrix ();
SwapBuffers (hdc);
Sleep (1);
}
}
ChangeDisplaySettings(NULL,0);
/* 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 format;
*hDC=GetDC(hWnd);
//Set the pixel format for the DC
memset(&pfd,0,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;
format = ChoosePixelFormat(*hDC,&pfd);
SetPixelFormat(*hDC,format,&pfd);
*hRC=wglCreateContext(*hDC);
wglMakeCurrent(*hDC,*hRC);
}
// Disable OpenGL
void DisableOpenGL (HWND hWnd, HDC hDC, HGLRC hRC)
{
wglMakeCurrent(NULL, NULL);
wglDeleteContext(hRC);
ReleaseDC(hWnd, hDC);
}
what's wrong with it?