@Thiago Lazier: Just a note: on the forums you can surround code with BBCode tags (i.e. [code]text[/code]) and it will maintain white-space, attempt to highlight the source, and even provides links to the Allegro manual and AFAIK a C standard library reference. 
You can see the rest of the BBCode syntax if you click the "Help" option in the toolbar above the post textarea (IMO it's hard to spot until you know it's there though)...
Assuming the above code is working, it repeatedly loads 1.bmp and 2.bmp before drawing them (technically leaking the memory consumed by the past iterations' loaded BITMAPs). So first of all, you're going to want to move the load_bitmap calls outside of the while loop.
Secondly, I've heard of two solutions for eliminating the "flickering" screen problem. Double buffering and using Allegro's vsync routine. Double buffering is a technique where you create an empty BITMAP structure (i.e. your buffer) with the same dimensions as the screen and draw everything to it. Then, when your game loop / frame ends you draw the buffer to the screen. System memory is much faster than video memory, IIRC, so this results in the whole operation being much faster, eliminating the visible flickering.
| 1 | #include <allegro.h> |
| 2 | |
| 3 | const char * const BMP_1 = "E:\\Documents and Settings\\Servidor\\Meus documentos\\1.bmp"; |
| 4 | const char * const BMP_2 = "E:\\Documents and Settings\\Servidor\\Meus documentos\\2.bmp"; |
| 5 | |
| 6 | int main(int argc, char *argv[]) |
| 7 | { |
| 8 | BITMAP *buffer = NULL, *a = NULL, *b = NULL; |
| 9 | |
| 10 | /* ... Initialization Of Allegro Goes Here ...*/ |
| 11 | |
| 12 | // Once Allegro is successfully initialized we create our screen buffer. |
| 13 | if((buffer = create_bitmap(screen->w, screen->h)) == NULL) |
| 14 | { |
| 15 | allegro_message("Failed to create screen buffer."); |
| 16 | exit(-1); |
| 17 | } |
| 18 | |
| 19 | // Now we load bitmaps from disk. |
| 20 | if((a = load_bitmap(BMP_1, NULL)) == NULL |
| 21 | || (b = load_bitmap(BMP_2, NULL)) == NULL) |
| 22 | { |
| 23 | allegro_message("Failed to load one or more bitmaps."); |
| 24 | exit(-1); |
| 25 | } |
| 26 | |
| 27 | // Begin the main loop. |
| 28 | while(!key[KEY_ESC]) |
| 29 | { |
| 30 | // Draw everything to the buffer instead of the screen. |
| 31 | draw_sprite(buffer, a, 0, 0); |
| 32 | draw_sprite(buffer, b, 0, 0); |
| 33 | |
| 34 | /* |
| 35 | * Then when you're finished drawing everything, draw the buffer onto the |
| 36 | * screen. |
| 37 | */ |
| 38 | blit(buffer, screen, 0, 0, 0, 0, screen->w, screen->h); |
| 39 | |
| 40 | // And, depending on the technique used, clear the buffer. |
| 41 | clear_bitmap(buffer); |
| 42 | } |
| 43 | |
| 44 | // Clean-up. |
| 45 | if(buffer) |
| 46 | { |
| 47 | destroy_bitmap(buffer); |
| 48 | buffer = NULL; |
| 49 | } |
| 50 | |
| 51 | if(a) |
| 52 | { |
| 53 | destroy_bitmap(a); |
| 54 | a = NULL; |
| 55 | } |
| 56 | |
| 57 | if(b) |
| 58 | { |
| 59 | destroy_bitmap(b); |
| 60 | b = NULL; |
| 61 | } |
| 62 | |
| 63 | return(0); |
| 64 | } |
| 65 | END_OF_MAIN() |
I've never used vsync before so I can't be sure on the syntax, but if you're still having problems after double buffering then you can give it a try too.
If you're able to show us more code then we can probably help you correct some other common mistakes before you get very far. A lot of people neglect return values, which leads to unexpected errors. If a routine returns a value indicating success or failure make sure to check that it was successful and react accordingly. Timing is another common problem.
IMHO, attempting to write an RPG before Oct 2 when you're this new is unlikely to succeed. You might want to negotiate with your teacher/professor either on the project or the deadline.
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