SOIL issues

[DeadEli]

I am somewhat new to classes and OpenGL, but I am trying to make a program incorporating them. I originally loaded textures using SOIL.h in my main .cpp file and everything worked fine. Now I am trying to add the loading of the texture and drawing it into a class. When I compile it (using Dev c++), my compiler doesn't flag any errors, but when it runs the program, the program shuts down before the window even pops up. When I remove the code for loading the texture in the constructor the program works, minus the fact that it doesn't display texture. Any ideas of what is wrong or how I can fix it?

[hanst99]

There are several problems with this:

1) You are trying to learn several, completely unrelated concepts at once. You will either go mad or give up at some point.
2) The "Dev" in "Dev C++" stands for "Devil".
3) What the heck is "SOIL"?
4) We can't help you if you won't tell us what the problem is.

[DeadEli]

SOIL is an image library which I found that can be used as a texture.
Also, I don't know what the issue is either. If I did, I could possibly fix it myself. Basically all I know is that when I load textures from within a class using a separate .cpp and .h files, the program compiles, but when it runs, it closes before the window is even displayed. I assume there is some error that occurs, so windows closes the application.

[hanst99]

We still don't know what you're actually doing, so unless we have a psychic here you'd have to show us.

[DeadEli]

In my class in the constructor this seems to be causing the error:
Texture[0] = SOIL_load_OGL_texture ("images/image1.jpg", SOIL_LOAD_AUTO, SOIL_CREATE_NEW_ID, SOIL_FLAG_MIPMAPS | SOIL_FLAG_INVERT_Y | SOIL_FLAG_NTSC_SAFE_RGB | SOIL_FLAG_COMPRESS_TO_DXT);
Once I remove this line, the program runs properly (without any texture).
in the class in the drawing function:

glBindTexture(GL_TEXTURE_2D, Texture[0]);
glBegin (GL_QUADS);
glColor3f (1.0f, 1.0f, 1.0f);
glTexCoord2f (0.0, 0.0);
glVertex2f (xPt, yPt);
glTexCoord2f (0.0, 1.0);
glVertex2f (xPt, yPt + height);
glTexCoord2f (1.0, 1.0);
glVertex2f (xPt + width, yPt + height);
glTexCoord2f (1.0, 0.0);
glVertex2f (xPt + width, yPt);
glEnd ();

does this help?

[hanst99]

I see... intermediate mode... it's... evil... argh. Nope sorry, can't help. Did you check if the texture is actually properly loaded?

[DeadEli]

no but I used the same code in my main .cpp file and it worked fine.

[hanst99]

In that case, the problem isn't the code. Does SOIL need any initialization?

[samljer]

First, stop using Dev-C++
It hasnt been updated since 2005; and has almost 400 known bugs.
The issue your having could be simply a compiler bug.

Second, when you do something like that in a class, rather then a simple function; you
need to double and triple check that all your initilizations, resources, etc etc are
being properly used in that scope/class.

Third, stop using Dev-C++
Code::Blocks, VC++ Express, Eclipse........ theres more too.

also, doesnt the dev-c++ latest version (which is again... 6 yrs old) follow an old c++ standard?
eventually your going to download code that wont run on it anyway

like the new nullptr.
int *somePointer = nullptr;


Life will be easier if you get something else, i understand it probably shipped on some CDROM with a beginners books "like it did for me"; and it just feels like home... but youll be surprized how fast that feeling passes when you get an IDE that just runs better.

[hanst99]

also, doesnt the dev-c++ latest version (which is again... 6 yrs old) follow an old c++ standard?

Nope, that's not the problem - it DOES ship with a completely outdated and buggy version of MinGW though.

[DeadEli]

I noticed that this:
Texture[0] = SOIL_load_OGL_texture ("images/image1.jpg", SOIL_LOAD_AUTO, SOIL_CREATE_NEW_ID, SOIL_FLAG_MIPMAPS | SOIL_FLAG_INVERT_Y | SOIL_FLAG_NTSC_SAFE_RGB | SOIL_FLAG_COMPRESS_TO_DXT);
creates errors when the image exists. When I type in random letters for a file name, the program runs properly, except that the texture isn't there. Any ideas on what could cause this?

Also, if I was to switch my IDE, what would be the best option?

[DeadEli]

Also, I found that loading texture in the constructor is an issue. I thought that the constructor's main purpose was to define variables when the class is loaded. Why does this not work?

[hanst99]

It's got nothing to do with the constructor. A constructor works exactly the same as any other function (because it IS any other function). I assume that you create the object before creating a valid opengl context.