1 /*
2 * This Code Was Created By Jeff Molofee 2000
3 * A HUGE Thanks To Fredric Echols For Cleaning Up
4 * And Optimizing This Code, Making It More Flexible!
5 * If You've Found This Code Useful, Please Let Me Know.
6 * Visit My Site At nehe.gamedev.net
7 */
8
9 #include <windows.h> // Header File For Windows
10 #include <gl\gl.h> // Header File For The OpenGL32 Library
11 #include <gl\glu.h> // Header File For The GLu32 Library
12
13 HDC hDC=NULL; // Private GDI Device Context
14 HGLRC hRC=NULL; // Permanent Rendering Context
15 HWND hWnd=NULL; // Holds Our Window Handle
16 HINSTANCE hInstance; // Holds The Instance Of The Application
17 int windowWidth = 0, windowHeight = 0;
18
19 bool keys[256]; // Array Used For The Keyboard Routine
20 bool active=TRUE; // Window Active Flag Set To TRUE By Default
21 bool fullscreen=TRUE; // Fullscreen Flag Set To Fullscreen Mode By Default
22
MessageBoxPrivate(HWND hWnd,const char * pMessage,const char * pTitle,int flags)23 static void MessageBoxPrivate( HWND hWnd, const char* pMessage, const char* pTitle, int flags )
24 {
25 printf( "%s: %s\n", pTitle, pMessage );
26 }
27
28 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // Declaration For WndProc
29
ReSizeGLScene(GLsizei width,GLsizei height)30 GLvoid ReSizeGLScene(GLsizei width, GLsizei height) // Resize And Initialize The GL Window
31 {
32 if (height==0) // Prevent A Divide By Zero By
33 {
34 height=1; // Making Height Equal One
35 }
36
37 glViewport(0,0,width,height); // Reset The Current Viewport
38
39 glMatrixMode(GL_PROJECTION); // Select The Projection Matrix
40 glLoadIdentity(); // Reset The Projection Matrix
41
42 // Calculate The Aspect Ratio Of The Window
43 gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);
44
45 glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix
46 glLoadIdentity(); // Reset The Modelview Matrix
47 }
48
InitGL(GLvoid)49 int InitGL(GLvoid) // All Setup For OpenGL Goes Here
50 {
51 glShadeModel(GL_SMOOTH); // Enable Smooth Shading
52 glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background
53 glClearDepth(1.0f); // Depth Buffer Setup
54 glEnable(GL_DEPTH_TEST); // Enables Depth Testing
55 glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do
56 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations
57 return TRUE; // Initialization Went OK
58 }
59
DrawGLScene(GLvoid)60 int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing
61 {
62 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear Screen And Depth Buffer
63 glLoadIdentity(); // Reset The Current Modelview Matrix
64 return TRUE; // Everything Went OK
65 }
66
KillGLWindow(GLvoid)67 GLvoid KillGLWindow(GLvoid) // Properly Kill The Window
68 {
69 if (fullscreen) // Are We In Fullscreen Mode?
70 {
71 ChangeDisplaySettings(NULL,0); // If So Switch Back To The Desktop
72 ShowCursor(TRUE); // Show Mouse Pointer
73 }
74
75 if (hRC) // Do We Have A Rendering Context?
76 {
77 if (!wglMakeCurrent(NULL,NULL)) // Are We Able To Release The DC And RC Contexts?
78 {
79 MessageBoxPrivate(NULL,"Release Of DC And RC Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
80 }
81
82 if (!wglDeleteContext(hRC)) // Are We Able To Delete The RC?
83 {
84 MessageBoxPrivate(NULL,"Release Rendering Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
85 }
86 hRC=NULL; // Set RC To NULL
87 }
88
89 if (hDC && !ReleaseDC(hWnd,hDC)) // Are We Able To Release The DC
90 {
91 MessageBoxPrivate(NULL,"Release Device Context Failed.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
92 hDC=NULL; // Set DC To NULL
93 }
94
95 if (hWnd && !DestroyWindow(hWnd)) // Are We Able To Destroy The Window?
96 {
97 MessageBoxPrivate(NULL,"Could Not Release hWnd.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
98 hWnd=NULL; // Set hWnd To NULL
99 }
100
101 if (!UnregisterClass((LPCWSTR)L"OpenGL",hInstance)) // Are We Able To Unregister Class
102 {
103 MessageBoxPrivate(NULL,"Could Not Unregister Class.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION);
104 hInstance=NULL; // Set hInstance To NULL
105 }
106 }
107
108 /* This Code Creates Our OpenGL Window. Parameters Are: *
109 * title - Title To Appear At The Top Of The Window *
110 * width - Width Of The GL Window Or Fullscreen Mode *
111 * height - Height Of The GL Window Or Fullscreen Mode *
112 * bits - Number Of Bits To Use For Color (8/16/24/32) *
113 * fullscreenflag - Use Fullscreen Mode (TRUE) Or Windowed Mode (FALSE) */
114
CreateGLWindow(char * title,int width,int height,int bits,bool fullscreenflag,bool hideWindow=true)115 BOOL CreateGLWindow(char* title, int width, int height, int bits, bool fullscreenflag, bool hideWindow=true)
116 {
117 GLuint PixelFormat; // Holds The Results After Searching For A Match
118 WNDCLASS wc; // Windows Class Structure
119 DWORD dwExStyle; // Window Extended Style
120 DWORD dwStyle; // Window Style
121 RECT WindowRect; // Grabs Rectangle Upper Left / Lower Right Values
122 WindowRect.left=(long)0; // Set Left Value To 0
123 WindowRect.right=(long)width; // Set Right Value To Requested Width
124 WindowRect.top=(long)0; // Set Top Value To 0
125 WindowRect.bottom=(long)height; // Set Bottom Value To Requested Height
126
127 fullscreen=fullscreenflag; // Set The Global Fullscreen Flag
128
129 hInstance = GetModuleHandle(NULL); // Grab An Instance For Our Window
130 wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC; // Redraw On Size, And Own DC For Window.
131 wc.lpfnWndProc = (WNDPROC) WndProc; // WndProc Handles Messages
132 wc.cbClsExtra = 0; // No Extra Window Data
133 wc.cbWndExtra = 0; // No Extra Window Data
134 wc.hInstance = hInstance; // Set The Instance
135 wc.hIcon = LoadIcon(NULL, IDI_WINLOGO); // Load The Default Icon
136 wc.hCursor = LoadCursor(NULL, IDC_ARROW); // Load The Arrow Pointer
137 wc.hbrBackground = NULL; // No Background Required For GL
138 wc.lpszMenuName = NULL; // We Don't Want A Menu
139 wc.lpszClassName = L"OpenGL"; // Set The Class Name
140
141 if (!RegisterClass(&wc)) // Attempt To Register The Window Class
142 {
143 MessageBoxPrivate(NULL,"Failed To Register The Window Class.","ERROR",MB_OK|MB_ICONEXCLAMATION);
144 return FALSE; // Return FALSE
145 }
146
147 if (fullscreen) // Attempt Fullscreen Mode?
148 {
149 DEVMODE dmScreenSettings; // Device Mode
150 memset(&dmScreenSettings,0,sizeof(dmScreenSettings)); // Makes Sure Memory's Cleared
151 dmScreenSettings.dmSize=sizeof(dmScreenSettings); // Size Of The Devmode Structure
152 dmScreenSettings.dmPelsWidth = width; // Selected Screen Width
153 dmScreenSettings.dmPelsHeight = height; // Selected Screen Height
154 dmScreenSettings.dmBitsPerPel = bits; // Selected Bits Per Pixel
155 dmScreenSettings.dmFields=DM_BITSPERPEL|DM_PELSWIDTH|DM_PELSHEIGHT;
156
157 // Try To Set Selected Mode And Get Results. NOTE: CDS_FULLSCREEN Gets Rid Of Start Bar.
158 if (ChangeDisplaySettings(&dmScreenSettings,CDS_FULLSCREEN)!=DISP_CHANGE_SUCCESSFUL)
159 {
160 /*
161 // If The Mode Fails, Offer Two Options. Quit Or Use Windowed Mode.
162 if (MessageBoxPrivate(NULL,"The Requested Fullscreen Mode Is Not Supported By\nYour Video Card. Use Windowed Mode Instead?","NeHe GL",MB_YESNO|MB_ICONEXCLAMATION)==IDYES)
163 {
164 fullscreen=FALSE; // Windowed Mode Selected. Fullscreen = FALSE
165 }
166 else
167 {
168 // Pop Up A Message Box Letting User Know The Program Is Closing.
169 MessageBoxPrivate(NULL,"Program Will Now Close.","ERROR",MB_OK|MB_ICONSTOP);
170 return FALSE; // Return FALSE
171 }
172 */
173 fullscreen=FALSE;
174 }
175 }
176
177 if (fullscreen) // Are We Still In Fullscreen Mode?
178 {
179 dwExStyle=WS_EX_APPWINDOW; // Window Extended Style
180 dwStyle=WS_POPUP; // Windows Style
181 ShowCursor(FALSE); // Hide Mouse Pointer
182 }
183 else
184 {
185 dwExStyle=WS_EX_APPWINDOW | WS_EX_WINDOWEDGE; // Window Extended Style
186 dwStyle=WS_OVERLAPPEDWINDOW; // Windows Style
187 }
188
189 AdjustWindowRectEx(&WindowRect, dwStyle, FALSE, dwExStyle); // Adjust Window To True Requested Size
190
191 // Create The Window
192 if (!(hWnd=CreateWindowEx( dwExStyle, // Extended Style For The Window
193 L"OpenGL", // Class Name
194 L"DXTCompress", // Window Title
195 dwStyle | // Defined Window Style
196 WS_CLIPSIBLINGS | // Required Window Style
197 WS_CLIPCHILDREN, // Required Window Style
198 0, 0, // Window Position
199 WindowRect.right-WindowRect.left, // Calculate Window Width
200 WindowRect.bottom-WindowRect.top, // Calculate Window Height
201 NULL, // No Parent Window
202 NULL, // No Menu
203 hInstance, // Instance
204 NULL))) // Dont Pass Anything To WM_CREATE
205 {
206 KillGLWindow(); // Reset The Display
207 MessageBoxPrivate(NULL,"Window Creation Error.","ERROR",MB_OK|MB_ICONEXCLAMATION);
208 return FALSE; // Return FALSE
209 }
210
211 static PIXELFORMATDESCRIPTOR pfd= // pfd Tells Windows How We Want Things To Be
212 {
213 sizeof(PIXELFORMATDESCRIPTOR), // Size Of This Pixel Format Descriptor
214 1, // Version Number
215 PFD_DRAW_TO_WINDOW | // Format Must Support Window
216 PFD_SUPPORT_OPENGL | // Format Must Support OpenGL
217 PFD_DOUBLEBUFFER, // Must Support Double Buffering
218 PFD_TYPE_RGBA, // Request An RGBA Format
219 bits, // Select Our Color Depth
220 0, 0, 0, 0, 0, 0, // Color Bits Ignored
221 0, // No Alpha Buffer
222 0, // Shift Bit Ignored
223 0, // No Accumulation Buffer
224 0, 0, 0, 0, // Accumulation Bits Ignored
225 16, // 16Bit Z-Buffer (Depth Buffer)
226 0, // No Stencil Buffer
227 0, // No Auxiliary Buffer
228 PFD_MAIN_PLANE, // Main Drawing Layer
229 0, // Reserved
230 0, 0, 0 // Layer Masks Ignored
231 };
232
233 if (!(hDC=GetDC(hWnd))) // Did We Get A Device Context?
234 {
235 KillGLWindow(); // Reset The Display
236 MessageBoxPrivate(NULL,"Can't Create A GL Device Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
237 return FALSE; // Return FALSE
238 }
239
240 if (!(PixelFormat=ChoosePixelFormat(hDC,&pfd))) // Did Windows Find A Matching Pixel Format?
241 {
242 KillGLWindow(); // Reset The Display
243 MessageBoxPrivate(NULL,"Can't Find A Suitable PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
244 return FALSE; // Return FALSE
245 }
246
247 if(!SetPixelFormat(hDC,PixelFormat,&pfd)) // Are We Able To Set The Pixel Format?
248 {
249 KillGLWindow(); // Reset The Display
250 MessageBoxPrivate(NULL,"Can't Set The PixelFormat.","ERROR",MB_OK|MB_ICONEXCLAMATION);
251 return FALSE; // Return FALSE
252 }
253
254 if (!(hRC=wglCreateContext(hDC))) // Are We Able To Get A Rendering Context?
255 {
256 KillGLWindow(); // Reset The Display
257 MessageBoxPrivate(NULL,"Can't Create A GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
258 return FALSE; // Return FALSE
259 }
260
261 if(!wglMakeCurrent(hDC,hRC)) // Try To Activate The Rendering Context
262 {
263 KillGLWindow(); // Reset The Display
264 MessageBoxPrivate(NULL,"Can't Activate The GL Rendering Context.","ERROR",MB_OK|MB_ICONEXCLAMATION);
265 return FALSE; // Return FALSE
266 }
267
268 if( hideWindow )
269 ShowWindow(hWnd,SW_HIDE); // Show The Window
270 else
271 ShowWindow(hWnd,SW_SHOW); // Show The Window
272 SetForegroundWindow(hWnd); // Slightly Higher Priority
273 SetFocus(hWnd); // Sets Keyboard Focus To The Window
274 ReSizeGLScene(width, height); // Set Up Our Perspective GL Screen
275
276 if (!InitGL()) // Initialize Our Newly Created GL Window
277 {
278 KillGLWindow(); // Reset The Display
279 MessageBoxPrivate(NULL,"Initialization Failed.","ERROR",MB_OK|MB_ICONEXCLAMATION);
280 return FALSE; // Return FALSE
281 }
282
283 return TRUE; // Success
284 }
285
WndProc(HWND hWnd,UINT uMsg,WPARAM wParam,LPARAM lParam)286 LRESULT CALLBACK WndProc( HWND hWnd, // Handle For This Window
287 UINT uMsg, // Message For This Window
288 WPARAM wParam, // Additional Message Information
289 LPARAM lParam) // Additional Message Information
290 {
291 switch (uMsg) // Check For Windows Messages
292 {
293 case WM_ACTIVATE: // Watch For Window Activate Message
294 {
295 if (!HIWORD(wParam)) // Check Minimization State
296 {
297 active=TRUE; // Program Is Active
298 }
299 else
300 {
301 active=FALSE; // Program Is No Longer Active
302 }
303
304 return 0; // Return To The Message Loop
305 }
306
307 case WM_SYSCOMMAND: // Intercept System Commands
308 {
309 switch (wParam) // Check System Calls
310 {
311 case SC_SCREENSAVE: // Screensaver Trying To Start?
312 case SC_MONITORPOWER: // Monitor Trying To Enter Powersave?
313 return 0; // Prevent From Happening
314 }
315 break; // Exit
316 }
317
318 case WM_CLOSE: // Did We Receive A Close Message?
319 {
320 PostQuitMessage(0); // Send A Quit Message
321 return 0; // Jump Back
322 }
323
324 case WM_KEYDOWN: // Is A Key Being Held Down?
325 {
326 keys[wParam] = TRUE; // If So, Mark It As TRUE
327 return 0; // Jump Back
328 }
329
330 case WM_KEYUP: // Has A Key Been Released?
331 {
332 keys[wParam] = FALSE; // If So, Mark It As FALSE
333 return 0; // Jump Back
334 }
335
336 case WM_SIZE: // Resize The OpenGL Window
337 {
338 windowWidth = LOWORD(lParam);
339 windowHeight = HIWORD(lParam);
340 ReSizeGLScene(windowWidth, windowHeight); // LoWord=Width, HiWord=Height
341 return 0; // Jump Back
342 }
343 }
344
345 // Pass All Unhandled Messages To DefWindowProc
346 return DefWindowProc(hWnd,uMsg,wParam,lParam);
347 }
348