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Quellcode

kotzing.o: In function 'show()'
D:\eigene programme\minispiel\kotzing.cpp:38: undefined reference to 'doubleBuffer'
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.s.
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kotzing.o: In function 'init()'
D:\eigene programme\minispiel\kotzing.cpp:61: undefined reference to 'doubleBuffer'
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.s.
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Quellcode

//kotzing.cpp 
#include <allegro.h> 
#include <time.h> 
#include "kotzing.h" 
#include "title.h" 

volatile int timerCounter = 0; 
static void  timerCounterUpdater() 
{ 
    timerCounter++;    
} 
END_OF_STATIC_FUNCTION(timerCounterUpdater); 

//Funktionen 
void fatalError(char *str) 
{ 
    allegro_message(str); 
    exit(0); 
} 

int setGfxMode(int mode, int width, int height) 
{ 
    static int colorDepths[] = { 16, 24, 15, 32}; 
    int a;  
    
    for (a=0; a < 4; a++) 
    { 
        set_color_depth(colorDepths[a]); 
        if (set_gfx_mode(mode, width, height, 0, 0) >= 0) 
        { 
            return TRUE; 
        } 
    } 
    return FALSE; 
} 

void show() 
{ 
    blit(doubleBuffer, screen, 0,0,0,0, doubleBuffer->w, doubleBuffer->h); 
} 

void init() 
{ 
    srand(time(NULL)); 
    
    //init 
    allegro_init(); 

    if (!setGfxMode(GFX_AUTODETECT_FULLSCREEN, 1024, 768)) 
    { 
        if (!setGfxMode(GFX_AUTODETECT_WINDOWED, 1024, 768)) 
        { 
            fatalError("Unable to set a graphics mode"); 
        } 
    } 
    install_timer();    
    install_keyboard(); 
    install_joystick(JOY_TYPE_AUTODETECT); 
    install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL); 
    
    doubleBuffer = create_bitmap(SCREEN_W, SCREEN_H); 
    if (!doubleBuffer) 
    { 
        fatalError("Unable to create double buffer"); 
    } 

    LOCK_FUNCTION(timerCounterUpdater); 
    LOCK_VARIABLE(timerCounter); 
    install_int_ex(timerCounterUpdater, BPS_TO_TIMER(60)); 
} 

//ende 
void done() 
{ 
    destroy_bitmap(doubleBuffer); 
} 

//main 
int main(int argc, char** argv) 
{ 
    int gameOver = FALSE; 
    
    init(); 
    
    while (!gameOver) 
    { 
       title(); 
    } 
    
    done(); 
} 
END_OF_MAIN();

Quellcode

//kotzing.h
#ifndef KOTZING_HEADER
#define KOTZING_HEADER
#include <allegro.h>

extern BITMAP*      doubleBuffer;
extern volatile int timerCounter;

void fatalError(char *str);
void show();

#endif