opengl documentation ?

Hi,
i'm new to opengl programing and i am having troubles to simply find the documentation for it.

I have already made a few things with DirectX, and i wondered if there was a documentation similar to the one given with the DirectX sdk (this document contains the description of the DirectX functions, notes from authors, ..., and i would need the same for opengl)

[Miguel_dup1]

go to nividia's page... www.nvidia.com

Well, i already went to nvidia's site, but i don't know what to take.

In fact, i am learning opengl init right now, and looking at some tutorials code, i see some functions and i wonder what they do... i would need a doc describing the opengl functions.

For exemple, in some tuts, they call the DescribePixelFormat, and in some other tuts, they don't call it... naturally, that excites my curiosity, then i would like to get a simple doc where the functions are listed and described briefly.

Thanks for your reply, i'll dig in nvidia's site, but could u give me the name of the document i have to look for please ? or maybe a link ?

[nexusone]

There is complete on-line documentation on this site, on the main page you can do a search for any Opengl function.

If you have not noticed there are lot's of book's on Opengl programming.

Also book's on-line, the openGL reb book is a good source on command usage.

Red book

Originally posted by charly:
Hi,
i'm new to opengl programing and i am having troubles to simply find the documentation for it.

I have already made a few things with DirectX, and i wondered if there was a documentation similar to the one given with the DirectX sdk (this document contains the description of the DirectX functions, notes from authors, ..., and i would need the same for opengl)

[This message has been edited by nexusone (edited 02-06-2002).]

[This message has been edited by nexusone (edited 02-06-2002).]

Thanks for your help.

[jmathies]

Visual C++ has full context sensative help
for all GL and GLU functions. Just type a function name, highlight it and hit F1.

Hmmm, one more thing,
i got it working a little bit now and i identified the source of the problem.
When i don't set up the projection and model matrices it seems to work. (i draw in 2D now)

Here is my code initializing the matrices :
//create a perspective projection
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();

gluPerspective (45.0f, (GLfloat) m_dwWidth / (GLfloat) m_dwHeight, 1.0f, 100.0f);

//switch to our model matrix stack
glMatrixMode (GL_MODELVIEW);
glLoadIdentity ();

Do you see something wrong in it ?

PS: i should still be able to draw in 2D even after having set up these matrices no ?

[Lev]

If you're drawing 2D you should set up an orthographic projection and not a perspective one:

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
now either
gluOrtho2D(..)
or
glOrtho(..)

-Lev

Sure, if i WANTED to draw 2D, actually, i draw 2D to try to make my code work.

I use the glVertex2i function to do so, and i feel like it draws on the screen plane, right ? (these are pre-transformed vertices who dont store homogeneous information, they are considered as already transformed (their range is of course [-1,1]))

If yes, it should be independent of the matrices, and should be directly shaded/drawn on the buffer, i guess.

If no, then it is normal that i have a diferent result when using this function after having set up the matrices or not...

I hope i am understandable.

[Lev]

The result *does* depends on how you set up your matrices, thats what matrices are for.

-Lev