// Win32 Tutorial (Win32 & OpenGL)
// Alan Baylis 2004
#include <windows.h>
#include "resource.h"
#include <gl\gl.h>
#include <gl\glu.h>
const char ClassName[] = "MainWindowClass";
HWND hWnd;
HDC hDC;
HGLRC hRC;
RECT ScreenRect;
RECT ClientRect;
float RotateX, RotateY, RotateZ;
void SetGLProjection(int Width, int Height)
{
if (Height == 0)
Height = 1;
glViewport(0, 0, Width, Height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0 ,(float)Width / (float)Height, 1.0, 200.0);
}
void SetGLView(int Width, int Height)
{
SetGLProjection(Width, Height);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void InitGL(int Width, int Height)
{
SetGLView(Width, Height);
glCullFace(GL_BACK);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClearDepth(1.0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glEnable(GL_NORMALIZE);
glEnable(GL_CULL_FACE);
GLfloat light_ambient[] = {0.2, 0.2, 0.2, 1.0};
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
GLfloat light_position[] = {200.0, 200.0, 200.0, 1.0};
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
GLfloat mat_ambient[] = {0.1, 0.5, 1.0, 1.0};
GLfloat mat_diffuse[] = {0.1, 0.5, 1.0, 1.0};
glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
}
void ResizeGLScene(int Width, int Height)
{
SetGLView(Width, Height);
}
void DrawGLScene(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
GLfloat light_position[] = {200.0, 200.0, 200.0, 1.0};
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glPushMatrix();
glTranslatef(0.0, 0.0, -5.0);
glRotatef(RotateX, 1, 0, 0);
glRotatef(RotateY, 0, 1, 0);
glRotatef(RotateZ, 0, 0, 1);
glBegin(GL_QUADS);
//Front Face
glNormal3f(0.0, 0.0, 1.0);
glVertex3f(-1.0f, -1.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
// Back Face
glNormal3f(0.0, 0.0, -1.0);
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, -1.0f);
// Top Face
glNormal3f(0.0, 1.0, 0.0);
glVertex3f(-1.0f, 1.0f, -1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
// Bottom Face
glNormal3f(0.0, -1.0, 0.0);
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
// Right face
glNormal3f(1.0, 0.0, 0.0);
glVertex3f( 1.0f, -1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, -1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f);
glVertex3f( 1.0f, -1.0f, 1.0f);
// Left Face
glNormal3f(-1.0, 0.0, 0.0);
glVertex3f(-1.0f, -1.0f, -1.0f);
glVertex3f(-1.0f, -1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, -1.0f);
glEnd();
glPopMatrix();
RotateX += 0.1;
RotateY += -0.2;
RotateZ += 0.3;
}
bool CreateGLContexts(HWND hWnd, HDC& hDC, HGLRC& hRC)
{
static PIXELFORMATDESCRIPTOR pfd;
pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.nVersion = 1;
pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.cColorBits = 16;
pfd.cRedBits = 0;
pfd.cRedShift = 0;
pfd.cGreenBits = 0;
pfd.cGreenShift = 0;
pfd.cBlueBits = 0;
pfd.cBlueShift = 0;
pfd.cAlphaBits = 0;
pfd.cAlphaShift = 0;
pfd.cAccumBits = 0;
pfd.cAccumRedBits = 0;
pfd.cAccumGreenBits = 0;
pfd.cAccumBlueBits = 0;
pfd.cAccumAlphaBits = 0;
pfd.cDepthBits = 16;
pfd.cStencilBits = 0;
pfd.cAuxBuffers = 0;
pfd.iLayerType = PFD_MAIN_PLANE;
pfd.bReserved = 0;
pfd.dwLayerMask = 0;
pfd.dwVisibleMask = 0;
pfd.dwDamageMask = 0;
hDC = GetDC(hWnd);
intPixelFormat;
PixelFormat = ChoosePixelFormat(hDC, &pfd);
if (!PixelFormat)
{
MessageBox(0, "Can't Find A Suitable PixelFormat.", "Error", MB_OK | MB_ICONERROR);
return FALSE;
}
if(!SetPixelFormat(hDC, PixelFormat, &pfd))
{
MessageBox(0, "Can't Set The PixelFormat.", "Error", MB_OK | MB_ICONERROR);
return FALSE;
}
hRC = wglCreateContext(hDC);
if(!hRC)
{
MessageBox(0, "Can't Create A GL Rendering Context.", "Error", MB_OK | MB_ICONERROR);
return FALSE;
}
if(!wglMakeCurrent(hDC, hRC))
{
MessageBox(0, "Can't activate GLRC.", "Error", MB_OK | MB_ICONERROR);
return FALSE;
}
return TRUE;
}
void ReleaseGLContexts(HWND hWnd, HDC hDC, HGLRC hRC)
{
ChangeDisplaySettings(NULL, 0);
wglMakeCurrent(hDC, NULL);
wglDeleteContext(hRC);
ReleaseDC(hWnd, hDC);
}
LRESULT CALLBACK WndProc( HWND hWnd,
UINT Msg,
WPARAM wParam,
LPARAM lParam )
{
switch (Msg)
{
case WM_CREATE:
if (CreateGLContexts(hWnd, hDC, hRC))
{
GetClientRect(hWnd, &ClientRect);
InitGL(ClientRect.right, ClientRect.bottom);
}
else
PostQuitMessage(0);
break;
case WM_KEYDOWN:
switch (wParam)
{
case VK_ESCAPE:
case VK_RETURN:
case VK_SPACE:
SendMessage(hWnd, WM_CLOSE, 0, 0);
break;
}
break;
case WM_SIZE:
GetClientRect(hWnd, &ClientRect);
ResizeGLScene(ClientRect.right, ClientRect.bottom);
break;
case WM_CLOSE:
ReleaseGLContexts(hWnd, hDC, hRC);
DestroyWindow(hWnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return (DefWindowProc(hWnd, Msg, wParam, lParam));
}
return (0);
}
INT WINAPI WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
INT nCmdShow )
{
WNDCLASSEX wc;
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = (WNDPROC)WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));
wc.hIconSm = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wc.lpszMenuName = NULL;
wc.lpszClassName = ClassName;
if (!RegisterClassEx(&wc))
{
MessageBox(NULL, "Failed To Register The Window Class.", "Error", MB_OK | MB_ICONERROR);
return 0;
}
GetWindowRect(GetDesktopWindow(), &ScreenRect);
hWnd = CreateWindowEx(
0,
ClassName,
"Win32 & OpenGL",
WS_OVERLAPPEDWINDOW,
(ScreenRect.right - 500) / 2 , (ScreenRect.bottom - 500) / 2,
500, 500,
NULL,
NULL,
hInstance,
NULL);
if (!hWnd)
{
MessageBox(NULL, "Window Creation Failed.", "Error", MB_OK | MB_ICONERROR);
return 0;
}
ShowWindow(hWnd, SW_SHOW);
UpdateWindow(hWnd);
MSG Msg;
while (1)
{
while (PeekMessage(&Msg, NULL, 0, 0, PM_NOREMOVE))
{
if (GetMessage(&Msg, NULL, 0, 0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
else
{
return Msg.wParam;
}
}
DrawGLScene();
glFinish();
SwapBuffers(hDC);
}
}
