Need some advice for OpenGL

[Cybermonkey]

Hi, I recently thought about doing a 2D game engine in OpenGL. Now, before I even started, I ran into some problems. Since I am very limited in my C/C++ knowledge I searched for other languages which utilizes OpenGL and had a closer look at the article here: http://games.freebasic.net/BASICGaming/Issue3/LachieLesson2/GL2D/gL2D_tut_1.html

Now I learned that almost all of that stuff is now deprecated (All the math stuff (glPushMatrix, glTranslate, glRotate ...) and all immediate rendering (glBegin, glVertex) etc. Now here's my question: is there a tutorial (best for Object Pascal) for building an OpenGL 2D engine which does not use deprecated stuff?
My second problem is what library I'll use for windowing, input etc.? Should I use SDL, so I can reuse some stuff of my SDL based engine, (Free)Glut, or something totally different? (Yes, I got that OpenGL superbible in an older (used) issue, but as said it's C/C++ and mainly about 3D programming).

Maybe a tutorial articles series here on PGD would be helpful. Something like that SDL tutorial (Artillery Game) by Jason but ported to OpenGL ...

[LP]

Now here's my question: is there a tutorial (best for Object Pascal) for building an OpenGL 2D engine which does not use deprecated stuff?

Yes. Clicky.

[Ñuño Martínez]

Actually, using OpenGL to draw 2D is exactly the same than doing 3D stuff but using only two axis (you know, use glVertex2f instead of glVertex3f). To make things easer you should use orthographic projection instead (glOrtho instead fo glFrustum).

Now I learned that almost all of that stuff is now deprecated (All the math stuff (glPushMatrix, glTranslate, glRotate ...) and all immediate rendering (glBegin, glVertex) etc. (...)

Is it? Did I miss something?

Recently I recycled myself about OpenGL for my 2nd PGD Challenge entry and I didn't find nothing about obsolescence...

[Cybermonkey]

Yes. Clicky.

Okay, I will have a look into that. Is there a GLEW.pas available??

[FelipeFS]

I heard that a lot of functions will be deprecated in OpenGL 4.x, BUT most of the hardware still do not support OpenGL 4.

I recommend you to use FreeGLUT, it will give you a good cross-platform support. I'm using it on my game engine.

[LP]

If you want to learn OpenGL well, I would recommend staying away from GLUT, SDL and other rudimentary helper libraries - you will have to write few lines of code extra, but you will know exactly what you are doing and will learn more. Besides, there is deprecated functionality too, for example gluBuild2DMipmaps, which you should replace in favor of glGenerateMipmap.

Is it? Did I miss something?

Recently I recycled myself about OpenGL for my 2nd PGD Challenge entry and I didn't find nothing about obsolescence...

Check this thread #1 and this thread #2, where it was discussed recently. Direct link to brief deprecated list.

[code_glitch]

What platform? If your going to do as LifePower says your going to need to either talk to X or WINAPI for window handling (no idea what mac uses) and it can be quite specific... For my OpenGL - X11 code I used this page: http://content.gpwiki.org/index.php/..._OpenGL_on_X11 and friends-of-fpc have a good tutorial on writing for WINAPI if I recall. The gpwiki link will need some understanding of C/C++ but is actually really good for cerating a context, and once you have that done its all standard opengl.

Good luck

[Cybermonkey]

Oh, best for all platforms: Linux, Windows, MacOS X.

[code_glitch]

In that case youd either have to use glut or sdl for easy window handling. However if the objective is pure opengl from the ground up you'll unfortunately have to write code for each of those platforms. Good luck - some of the code you have to interface with can be a little archaic at times....

[WILL]

If those are your main or only platforms then SDL is probably your easiest and friendliest solution. I'm not partial to GLUT myself and it doesn't do everything that SDL is going to do for you. (controller/gamepad input, audio/music mixer, some texture loading routines)

Once you have a decent SDL base to work with the rest can be all OpenGL for your graphics. The NeHe tutorials can help you get started, but I'm not sure if they cover using SDL with OpenGL. SDL is in fact designed to use OpenGL instead for graphics, that's why they bundle it together.