Noob Memory Leak (?) problem

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September 27th, 2005, 08:23 AM

BadBoyZ

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Join Date: Sep 2005

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Noob Memory Leak (?) problem

Hi All

First off, I suck at C, so bear with me please.
I need to do an OpenGL project which was going fine until I ran into a weird problem. After adding some code which initialises an array, my program stopped doing anything. If I ran it, it immediatly terminated. No error/warning message, nothing. I tried tracing my problems, but as soon as I entered a simple cerr the program worked again, 100%. As long as I leave the cerr there, it works, if I comment it out, it doesn't work anymore.

The only thing I can think of is a pointer problem, but I can't see where I went wrong. The only pointer I have is the one in the code below:

Ps. Don't worry about the OpenGL calls, their all pretty standard.

Code:

int main(int argc, char** argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
	glutInitWindowSize(640, 480);
	glutCreateWindow("OpenGL");
	glutDisplayFunc(display);
	glutReshapeFunc(reshape);
	glutSpecialFunc(specialKeys);
	glutIdleFunc(idle);
	
             cerr << "HELP ME!!!" << endl;   // The cerr which fixed everything!
	initialise();
	glutMainLoop();
}

void initialise()
{
	glClearColor(0.0, 0.0, 0.0, 1.0);
	glEnable(GL_DEPTH_TEST);
   glEnable(GL_TEXTURE_2D);

   loadTextures();

   xLook = sin(angle * M_PI / 180);
	zLook = cos(angle * M_PI / 180);
   yPos = LOOKHEIGHT;

   // Initialise PoolMap
   // Commenting out this the part below also fixes the problem!
   for (int x = 0; x < POOLWIDTH; ++x)
   {
      for (int z = 0; z < POOLWIDTH; ++z)
      {
         waterMap[z * POOLWIDTH + x] = getRandomFloat(-0.05, 0.05);
      }
   }

   idleCount = 0;
}

float getRandomFloat(float low, float high) 
{
	return ((float)rand() / (RAND_MAX + 1.0)) * (high - low) + low;
}

float waterMap[POOLWIDTH * POOLWIDTH];

Any help will be appreciated.
Thank you

September 27th, 2005, 09:27 AM

Itsacon

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Some thoughts, though I'm not sure if any are related to your problem:
First, in function initialise(), depends on which compiler you're using (more specifically, are you coding C or C++. If C, it may be that your compiler doesn't like the int x and int z declarations int the for loop. Officially, in ANSI-C, all declarations have to be done before any other statements in a functions, so you might want to change that function to:

c Code:

Original - c Code

void initialise()
{
    int x, z;
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_TEXTURE_2D);
 
    loadTextures();
 
    xLook = sin(angle * M_PI / 180);
    zLook = cos(angle * M_PI / 180);
    yPos = LOOKHEIGHT;
 
    // Initialise PoolMap
    // Commenting out this the part below also fixes the problem!
    for (x = 0; x < POOLWIDTH; ++x)
    {
        for (z = 0; z < POOLWIDTH; ++z)
        {
            waterMap[z * POOLWIDTH + x] = getRandomFloat(-0.05, 0.05);
        }
    }
    idleCount = 0;
}

Another thing I noticed, which should give you a warning, is that your int main() doesn't give a return value.
End it with 'return 0;'
Though this should not be related in any way to your troubles.

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