OpenGL / DevIL

Graphics and GPU Programming Programming OpenGL

Started by KuJi March 18, 2008 12:22 AM

9 comments, last by KuJi 16 years ago

KuJi

136

Author

March 18, 2008 12:22 AM

I think i've stumbled upon a memory leak (or im not freeing the resource correctly..) The memory problem occurs here:


	ILuint ilTexture;
	ilGenImages(1, &ilTexture);
	ilBindImage(ilTexture);

	if (ilLoadImage(path))
	{
		// nothing here -- just testing
	}

	ilDeleteImages(1, &ilTexture);

One thing you need to understand is that calling ilLoadImage (without generating / binding the texture) won't cause this. This is the minimum I came up with to reproduce the memory leak. Does this occur to anyone else? Am I not freeing it correctly? :(

Neutrinohunter

158

March 18, 2008 03:30 PM

I'm no expert but I'm presuming each of those function provides a return value for a failure?

Try doing a IlBindImage(0) or equivalent for unbinding the texture and see if the problem still occurs. But no, if the code produces a texture fine in the generate texture phase you shouldn't have that problem.

Also how big a memory leak are you talking about and how are you tracking it?

Jamie

swiftcoder

18,997

March 18, 2008 03:44 PM

The current image is not deleted until it is unbound (i.e. either zero or another image is bound). That may show up as a temporary memory leak, but you need to be more specific about this leak.

Tristam MacDonald. Ex-BigTech Software Engineer. Future farmer. [https://trist.am]

KuJi

136

Author

March 18, 2008 03:56 PM

Quote:Original post by swiftcoder
The current image is not deleted until it is unbound (i.e. either zero or another image is bound). That may show up as a temporary memory leak, but you need to be more specific about this leak.

I've waited about 2-5 minutes and nothing has shown to fix this. Problem is, when using SDL and resizing -- I went to go use the function to reload all the graphics back to opengl, and noticed this.

Quote:Original post by Neutrinohunter
I'm no expert but I'm presuming each of those function provides a return value for a failure?

Try doing a IlBindImage(0) or equivalent for unbinding the texture and see if the problem still occurs. But no, if the code produces a texture fine in the generate texture phase you shouldn't have that problem.

Also how big a memory leak are you talking about and how are you tracking it?

Jamie

I watch it via control-alt-delete when resizing. And I'll try that.

*Edit* No, it still occurs -- and depending on how many graphics were loaded, it could be a couple mb per resize.

V-man

813

March 18, 2008 05:20 PM

Quote:Original post by KuJi
I watch it via control-alt-delete when resizing. And I'll try that.

*Edit* No, it still occurs -- and depending on how many graphics were loaded, it could be a couple mb per resize.

You mean the task manager? That`s not a good way to know if there is a leak or not. The compiler will tell you if you have a leak or you need to use a 3rd party tool.

Sig: http://glhlib.sourceforge.net
an open source GLU replacement library. Much more modern than GLU.
float matrix[16], inverse_matrix[16];
glhLoadIdentityf2(matrix);
glhTranslatef2(matrix, 0.0, 0.0, 5.0);
glhRotateAboutXf2(matrix, angleInRadians);
glhScalef2(matrix, 1.0, 1.0, -1.0);
glhQuickInvertMatrixf2(matrix, inverse_matrix);
glUniformMatrix4fv(uniformLocation1, 1, FALSE, matrix);
glUniformMatrix4fv(uniformLocation2, 1, FALSE, inverse_matrix);

KuJi

136

Author

March 18, 2008 05:40 PM

Quote:Original post by V-man
You mean the task manager? That`s not a good way to know if there is a leak or not. The compiler will tell you if you have a leak or you need to use a 3rd party tool.

Well seeing the memory climb 20 mb because the game is resized is definitely a problem <.<.

Neutrinohunter

158

March 18, 2008 06:08 PM

I agree with V-Man, its the not best way but one can generally acertain massive leaks in a program with a Task Manager. I once got my code to go up to around 500,000k within Windows then crash the OS when I forgot to clear something up so it is possible to track with it.

I generally error on the side of its your code unless proven otherwise, even though recently I have proved various bugs within the QT rendering library.

Post the whole source so one of us can compile it, there could be a million different reasons for the problem.

Neutrinohunter