Code:
#include <windows.h>
#include <gl/gl.h>
#include <gl/glu.h>
// Global variables
HWND hWnd;
HDC hDC;
HGLRC hRC;
// Set up pixel format for graphics initialization
void SetupPixelFormat()
{
PIXELFORMATDESCRIPTOR pfd, *ppfd;
int pixelformat;
ppfd = &pfd;
ppfd->nSize = sizeof(PIXELFORMATDESCRIPTOR);
ppfd->nVersion = 1;
ppfd->dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
ppfd->dwLayerMask = PFD_MAIN_PLANE;
ppfd->iPixelType = PFD_TYPE_COLORINDEX;
ppfd->cColorBits = 16;
ppfd->cDepthBits = 16;
ppfd->cAccumBits = 0;
ppfd->cStencilBits = 0;
pixelformat = ChoosePixelFormat(hDC, ppfd);
SetPixelFormat(hDC, pixelformat, ppfd);
}
// Initialize OpenGL graphics
void InitGraphics()
{
hDC = GetDC(hWnd);
SetupPixelFormat();
hRC = wglCreateContext(hDC);
wglMakeCurrent(hDC, hRC);
glClearColor(0, 0, 0, 0.5);
glClearDepth(1.0);
glEnable(GL_DEPTH_TEST);
}
// Resize graphics to fit window
void ResizeGraphics()
{
// Get new window size
RECT rect;
int width, height;
GLfloat aspect;
GetClientRect(hWnd, &rect);
width = rect.right;
height = rect.bottom;
aspect = (GLfloat)width / height;
// Adjust graphics to window size
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, aspect, 1.0, 100.0);
glMatrixMode(GL_MODELVIEW);
}
// Draw frame
void DrawGraphics()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
// Show the new scene
glFlush();
SwapBuffers(hDC);
}
// Handle window events and messages
LONG WINAPI MainWndProc (HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
switch (uMsg)
{
case WM_SIZE:
ResizeGraphics();
break;
case WM_CLOSE:
DestroyWindow(hWnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
// Default event handler
default:
return DefWindowProc (hWnd, uMsg, wParam, lParam);
break;
}
return 1;
}
// Main function
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
const LPCWSTR appname = TEXT("OpenGL Sample");
WNDCLASS wndclass;
MSG msg;
// Define the window class
wndclass.style = 0;
wndclass.lpfnWndProc = (WNDPROC)MainWndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(hInstance, appname);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wndclass.lpszMenuName = appname;
wndclass.lpszClassName = appname;
// Register the window class
if (!RegisterClass(&wndclass)) return FALSE;
// Create the window
hWnd = CreateWindow(
appname,
appname,
WS_OVERLAPPEDWINDOW | WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
CW_USEDEFAULT,
CW_USEDEFAULT,
800,
600,
NULL,
NULL,
hInstance,
NULL);
if (!hWnd) return FALSE;
// Initialize OpenGL
InitGraphics();
// Display the window
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
// Event loop
while (1)
{
if (PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE) == TRUE)
{
if (!GetMessage(&msg, NULL, 0, 0)) return TRUE;
TranslateMessage(&msg);
DispatchMessage(&msg);
}
DrawGraphics();
}
wglDeleteContext(hRC);
ReleaseDC(hWnd, hDC);
}
This is the main code that i must use to draw the grid