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| Problems drawing bitmaps (it just crashes) |
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Ex777 Ex777
Member #7,101
April 2006
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Okay well I'm having some problems making my program draw bitmaps. The program compiles fine and starts to run but when It gets to the main game loop where it needs to draw the scene it crashes with a runtime debug error. Here is the main C++ file: 1/*************************************************************************************************
2 File: main.cpp
3 Desc: Main jdpong2000 file
4 Author: Ex777
5 Time Stamp: 4-6-06 (date started)
6*************************************************************************************************/
7
8/*////////////////////////////////////////////////////////////////////////////////////////////////
9 Block: Include statements
10 Desc: Calls any .h or .hpp files needed to successfully compile the program.
11////////////////////////////////////////////////////////////////////////////////////////////////*/
12#include "jdBase.h"
13//#include "jdMainGlobals.h"
14#include "jdAllegro.h"
15
16/*////////////////////////////////////////////////////////////////////////////////////////////////
17 Block: Structures
18 Desc: Define structures needed by the game
19////////////////////////////////////////////////////////////////////////////////////////////////*/
20struct jdPlayer
21{
22 int x, y; // coords on the screen for the paddle
23 int w, h; // width and height of the paddle
24 int score; // score of the player
25 bool AI; // true if the player is computer controled false if otherwise
26 //BITMAP *paddle; // bitmap of the paddle
27};
28
29struct jdBall
30{
31 int x, y; // coords on the screen for the ball
32 int w, h; // widht and height of the ball
33 int speedx; // speed of the ball on the x axis
34 int speedy; // speed of the ball on the y axis
35 //BITMAP *ball; // bitmap of the ball
36};
37
38/*////////////////////////////////////////////////////////////////////////////////////////////////
39 Block: Global Variables
40 Desc: Define global variables needed by the game.
41////////////////////////////////////////////////////////////////////////////////////////////////*/
42BITMAP *buffer;
43BITMAP *intro;
44BITMAP *logo;
45BITMAP *paused;
46BITMAP *paddle;
47BITMAP *ballbmp;
48
49jdBall ball;
50jdPlayer player1;
51jdPlayer player2;
52
53FILE *logfile;
54
55int playing;
56int level;
57bool training;
58
59int menuing_main;
60
61int tuffhet; // used for the computer enemy if one exists
62
63/*////////////////////////////////////////////////////////////////////////////////////////////////
64 Block: Functions
65 Desc: Functions created to run the program.
66////////////////////////////////////////////////////////////////////////////////////////////////*/
67/*________________________________________________________________________________________________
68 Function: void alert ( const char* msg )
69 Desc: Outputs an error to the user.
70 Returns: nothing.
71 Args: void.
72________________________________________________________________________________________________*/
73void alert(const char* msg)
74{
75 allegro_message(msg);
76}
77
78/*________________________________________________________________________________________________
79 Function: bool LoadBitmapFromFile( BITMAP* bmp, const char* filepath, char* errMSG )
80 Desc: Loads a bitmap from a file.
81 Returns: true on success, false on failure.
82 Args: bmp = the bitmap to load the bitmap file on.
83 filepath = the path to the bitmap to load.
84 errMSG = message to display if bitmap didnt load.
85________________________________________________________________________________________________*/
86bool LoadBitmapFromFile(BITMAP *bmp, const char* filepath, const char* errMSG)
87{
88 debug("Bitmap is going to be loaded from load_bitmap");
89 bmp = load_bitmap(filepath, NULL);
90 debug("bitmap has been loaded from load_bitmap");
91
92 if (bmp == 0)
93 {
94 alert(errMSG);
95 return false;
96 }
97
98 debug("bitmap returning true");
99 return true;
100}
101
102/*________________________________________________________________________________________________
103 Function: bool SetupAllegro( void )
104 Desc: Sets up all allegro stuff needed to creat a window.
105 Returns: boolean, true on success, false on failure.
106 Args: void.
107________________________________________________________________________________________________*/
108bool SetupAllegro( void )
109{
110 allegro_init();
111
112 install_keyboard();
113
114 install_mouse();
115
116 install_timer();
117
118 // seed the random generator
119 srand(time(NULL));
120
121 // set the text mode
122 text_mode(-1); // background is transparent
123
124 // set the video mode
125 set_color_depth(desktop_color_depth()); // could be desktop_color_depth()
126
127 if (set_gfx_mode(MODE, WIDTH, HEIGHT, 0, 0) != 0)
128 {
129 alert(allegro_error);
130 exit(0);
131 return false;
132 }
133
134 // set the audio mode
135 if (install_sound(DIGI_AUTODETECT, MIDI_NONE, "") != 0)
136 {
137 alert("Error initializing sound system!");
138 return false;
139 }
140
141 return true; // allegro successfully setup
142}
143
144/*________________________________________________________________________________________________
145 Function: bool SetupPlayer ( jdPlayer player, int side, bool AI )
146 Desc: Sets up all variables inside the jdPlayer structure.
147 Returns: boolean, true on success, false on failure.
148 Args: jdPlayer = the player structer.
149 side = the side the player is located.
150 AI = is the player computer controlled?
151________________________________________________________________________________________________*/
152bool SetupPlayer( jdPlayer player, int side, bool AI )
153{
154 player.w = paddle->w;
155 player.h = paddle->h;
156
157 if (side == RIGHT)
158 {
159 player.x = WIDTH-20-player.w;
160 player.y = HEIGHT/2-(player.h/2);
161 }
162 else if (side == LEFT)
163 {
164 player.x = 10+player.w;
165 player.y = HEIGHT/2-(player.h/2);
166 }
167 else
168 return false;
169
170 player.score = 0;
171
172 return true; // player successfully created
173}
174
175/*________________________________________________________________________________________________
176 Function: bool SetupBall( jdBall sball )
177 Desc: Sets up all variables required to creat a ball.
178 Returns: boolean, true on success, false on failure.
179 Args: sball = the ball structure to setup.
180________________________________________________________________________________________________*/
181bool SetupBall( jdBall sball)
182{
183
184 sball.w = ballbmp->w;
185 sball.h = ballbmp->h;
186 sball.x = WIDTH/2-(sball.w/2);
187 sball.y = HEIGHT/2-(sball.h/2);
188 sball.speedx = 9;
189 sball.speedy = 7;
190
191 return true; // ball created successfully
192}
193
194
195/*________________________________________________________________________________________________
196 Function: bool SetupGlobals( void )
197 Desc: Sets up all globals that are required for the game.
198 Returns: boolean, true on success, false on failure.
199 Args: void.
200________________________________________________________________________________________________*/
201bool SetupGlobals( void )
202{
203 debug("SetupPlayer - player1");
204 if (!SetupPlayer(player1, RIGHT, false))
205 {
206 return false;
207 }
208 debug("SetupPlayer - player1 completed");
209
210 if (!SetupPlayer(player2, LEFT, true))
211 {
212 return false;
213 }
214
215 if (!SetupBall(ball))
216 {
217 return false;
218 }
219
220 playing = 1;
221 level = 1;
222 training = false;
223 menuing_main = 1;
224 tuffhet = 10;
225
226 return true; // globals successfuly setup
227}
228
229/*________________________________________________________________________________________________
230 Function: bool SetupBitmaps( void )
231 Desc: Loads all bitmaps required by the game.
232 Returns: boolean, true on success, false on failure.
233 Args: void.
234________________________________________________________________________________________________*/
235bool SetupBitmaps( void )
236{
237 // paddle bitmap
238 if(!LoadBitmapFromFile(paddle, "graphics/slider.bmp", "Error loading graphics/slider.bmp"))
239 {
240 return false;
241 }
242
243 // ball bitmap
244 if(!LoadBitmapFromFile(ballbmp, "graphics/ball.bmp", "Error loading graphics/ball.bmp"))
245 {
246 return false;
247 }
248
249 // logo bitmap
250 if(!LoadBitmapFromFile(logo, "graphics/logo.bmp", "Error loading graphics/logo.bmp"))
251 {
252 return false;
253 }
254
255 // paused bitmap
256 if(!LoadBitmapFromFile(paused, "graphics/paused.bmp", "Error loading graphics/paused.bmp"))
257 {
258 return false;
259 }
260
261 // intro bitmap
262 if(!LoadBitmapFromFile(intro, "graphics/intro.bmp", "Error loading graphics/intro.bmp"))
263 {
264 return false;
265 }
266
267 // back buffer bitmap
268 buffer = create_bitmap(WIDTH,HEIGHT);
269 if (buffer == 0)
270 {
271 alert(allegro_error);
272 return false;
273 }
274
275 return true; // all bitmaps have loaded successfully
276}
277
278/*________________________________________________________________________________________________
279 Function: bool Setup ( void )
280 Desc: Calls all setup functions.
281 Returns: boolean, true on success, false on failure.
282 Args: void.
283________________________________________________________________________________________________*/
284bool Setup( void )
285{
286 debug("Seup called");
287
288 if (!SetupAllegro())
289 {
290 debug("SetupAllegro() some how messed up");
291
292 return false;
293 }
294 debug("SetupAllegro() completed");
295
296 if (!SetupGlobals())
297 {
298 debug("SetupGlobals() some how messed up");
299
300 return false;
301 }
302 debug("SetupGlobals() completed");
303
304 if (!SetupBitmaps())
305 {
306 debug("SetupBitmaps() some how messed up");
307
308 return false;
309 }
310 debug("SetupBitmaps() completed");
311
312 return true;
313}
314
315/*________________________________________________________________________________________________
316 Function: bool DeAllocateBitmap( BITMAP *bmp )
317 Desc: Clears and destroys allocated bitmaps
318 Returns: boolean, true on success, false on failure.
319 Args: bmp = bitmap to deallocate.
320________________________________________________________________________________________________*/
321bool DeAllocateBitmap( BITMAP *bmp )
322{
323 destroy_bitmap( bmp );
324
325 return true;
326}
327
328/*________________________________________________________________________________________________
329 Function: bool CleanupBitmaps ( void )
330 Desc: Clears and destroys allocated bitmaps
331 Returns: boolean, true on success, false on failure.
332 Args: void.
333________________________________________________________________________________________________*/
334bool CleanupBitmaps( void )
335{
336 // logo bitmap
337 if (!DeAllocateBitmap(logo))
338 {
339 return false;
340 }
341
342 // paused bitmap
343 if (!DeAllocateBitmap(paused))
344 {
345 return false;
346 }
347
348 // intro bitmap
349 if (!DeAllocateBitmap(intro))
350 {
351 return false;
352 }
353
354 // buffer bitmap
355 if (!DeAllocateBitmap(buffer))
356 {
357 return false;
358 }
359
360 // paddle bitmap
361 if (!DeAllocateBitmap(paddle))
362 {
363 return false;
364 }
365
366 // ball bitmap
367 if (!DeAllocateBitmap(ballbmp))
368 {
369 return false;
370 }
371
372 return true; // cleanup was successful
373}
374
375/*________________________________________________________________________________________________
376 Function: bool Cleanup ( void )
377 Desc: Clears and destroys allocated bitmaps, sounds, ect..
378 Returns: boolean, true on success, false on failure.
379 Args: void.
380________________________________________________________________________________________________*/
381bool Cleanup( void )
382{
383 if (!CleanupBitmaps())
384 {
385 return false;
386 }
387
388 return true; // cleanup was successful
389}
390
391/*________________________________________________________________________________________________
392 Function: void HandleKeys ( void )
393 Desc: Handles user key presses
394 Returns: nothing.
395 Args: void.
396________________________________________________________________________________________________*/
397void HandleKeys( void )
398{
399 if (key[KEY_ESC])
400 {
401 playing = 0;
402 }
403
404 return;
405}
406
407/*________________________________________________________________________________________________
408 Function: bool CheckBallColide ( jdBall cball )
409 Desc: checks to see if there is a colition between the ball and boundries or paddles.
410 Returns: true if hit false if no hit.
411 Args: cball = the ball we are checking for colitions
412________________________________________________________________________________________________*/
413bool CheckBallColide( jdBall cball )
414{
415 if (cball.x + cball.w >= player1.x)
416 {
417 if (cball.y + cball.w >= player1.y)
418 {
419 if (cball.y <= player1.y + player1.h)
420 {
421 cball.speedx = abs(cball.speedx + rand() % 3) * -1;
422 return true;
423 }
424 }
425 }
426
427 if (cball.x <= player2.x + player2.w)
428 {
429 if (cball.y + cball.h >= player2.y)
430 {
431 if (cball.y <= player2.y + player2.h)
432 {
433 cball.speedx = abs(cball.speedx - rand() % 3);
434 return true;
435 }
436 }
437 }
438 return false; // no colition occured
439}
440
441/*________________________________________________________________________________________________
442 Function: void UpdateBall ( void )
443 Desc: Updates ball.
444 Returns: nothing.
445 Args: void.
446________________________________________________________________________________________________*/
447void UpdateBall( void )
448{
449 ball.x = ball.x + ball.speedx;
450 ball.y = ball.y + ball.speedy;
451
452 if(CheckBallColide(ball))
453 {
454 // colition happend - play sound
455 }
456
457 return;
458}
459
460/*________________________________________________________________________________________________
461 Function: void DrawScene ( void )
462 Desc: Draws bitmaps and all that.
463 Returns: boolean, true on success, false on failure.
464 Args: void.
465________________________________________________________________________________________________*/
466void DrawScene( void )
467{
468 debug("Drawing player1.paddle");
469 draw_sprite(buffer, paddle, player1.x, player1.y);
470 debug("Drawing player2.paddle");
471 draw_sprite(buffer, paddle, player2.x, player2.y);
472 debug("Drwing ball");
473 draw_sprite(buffer, ballbmp, ball.x, ball.y);
474 return;
475}
476
477/*________________________________________________________________________________________________
478 Function: bool DoMainLoop ( void )
479 Desc: Updates graphics, sound, movement, AI, everything...
480 Returns: boolean, true on success, false on failure.
481 Args: void.
482________________________________________________________________________________________________*/
483bool DoMainLoop( void )
484{
485 HandleKeys(); // handle user input through keybored
486 UpdateBall(); // update ball position
487 DrawScene(); // draw the scene
488
489 return true; // tic successfull
490}
491
492/*________________________________________________________________________________________________
493 Function: int main ( void )
494 Desc: Main file for the whole game, calls functions to load resources, handle input,
495 colisions, Ai, the main game loop ect...
496 Returns: integer value, 0 on exit;
497 Args: void.
498________________________________________________________________________________________________*/
499int main ( void )
500{
501 debug("Going to call setup()");
502
503 if (!Setup())
504 {
505 // clean up allocated bitmaps, sounds, ect..
506 if(!Cleanup())
507 exit(0);
508
509 return 0;
510 }
511
512 debug("Entering main loop");
513
514 while (playing == 1)
515 {
516 cls(buffer); // clear buffer contents
517
518 if(!DoMainLoop())
519 playing = 0;
520
521 vsync(); // wait for verticle synk
522 flip(buffer); // display buffer contents
523
524 }
525
526 debug("entering Cleanup()");
527
528 Cleanup();
529
530 debug("Cleanup() successfull");
531
532 return 0;
533}
534END_OF_MAIN();
I have tried all I can think of and nothing works I just get errors all over the place. Please understand this is not nearly done, I'm just trying to make it display some bitmaps before I can push forward with development and add sound, networking, and input code. Please Help!!!!! I truly cant understand why I'm getting this error |
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Jonny Cook
Member #4,055
November 2003
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The problem seems to be in the function LoadBitmapFromFile. When you set the BITMAP pointer to the loaded bitmap, it's not actually changing the pointer you passed. Instead, you should change the parameter to a BITMAP **bmp (pointer to a pointer), or return the loaded bitmap. Try something like this: BITMAP *LoadBitmapFromFile(const char* filepath, const char* errMSG) { debug("Bitmap is going to be loaded from load_bitmap"); BITMAP *bmp = load_bitmap(filepath, NULL); debug("bitmap has been loaded from load_bitmap"); if (!bmp) { alert(errMSG); return NULL; } debug("bitmap returning loaded bitmap"); return bmp; } This is pretty basic stuff... perhaps you should read a few C tutorials before you start such a project. [edit] The face of a child can say it all, especially the mouth part of the face. |
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Ex777 Ex777
Member #7,101
April 2006
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Thank you I shall give that one a try. [EDIT] |
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