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KrishKP

OpenGL programming

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Hello there...I am a beginner to graphics and game programming.I have a doubt.What do you mean by OpenGL programming?Is it the same as C++ graphics programming?

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So OpenGL is a library.Which has built in functions for our uses...Its what helps us to do graphics programming.What we call OpenGL code is actually C++ code right?

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  • I would not say built in functions, because the library itself provides functions we need for our purpose. In the library itself is nothing "built in"
    • but simply said yes you are right
  • OpenGL Code
    • if you use c++ as code language and use the OpenGL library then yes
Edited by exOfde
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OpenGL, like directx, are bits of code stored in a dll. It doesn't matter which language use them, as long as the language can load dlls, and you have the proper include files to access those functions from the dll, you'll be fine. For example, you could do OpenGL or dx in delphi or c# if you want to, it's just a bit more trouble to make it work at first, but when you're setuped, it's pretty much the same as c++.

 

Learning pure opengl is not easy at first, but fesable. You could start with glut since it handle the setup of a basic application for you, which mean you can concentrate on the code that really matter. Or try something like SDL.

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OpenGL, like directx, are bits of code stored in a dll. It doesn't matter which language use them, as long as the language can load dlls, and you have the proper include files to access those functions from the dll, you'll be fine. For example, you could do OpenGL or dx in delphi or c# if you want to, it's just a bit more trouble to make it work at first, but when you're setuped, it's pretty much the same as c++.

 

Learning pure opengl is not easy at first, but fesable. You could start with glut since it handle the setup of a basic application for you, which mean you can concentrate on the code that really matter. Or try something like SDL.

what is pure OpenGL?

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I would guess he meant writing OpenGL code without any helper libraries. That is usually not a good idea. There is a lot of boiler plate code to be written until you get a window you can draw in. SFML, GLFW or SDL both simplify that process massively and are relatively easy to use (and cross-platform). I would not recommend GLUT.

If you are working on Windows you will also want GLEW since you only get (completely useless) OpenGL 1.1 out of the box.
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Then each language will have different codes while working with OpenGL right?There is no OpenGL code..Only C++ or any other language code implementing OpenGL functions..right?

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The language of your OpenGL implementation is completely irrelevant and there is no one answer. Even on a fairly locked down operating system like Windows, the code contained in the library you link to is just a thin wrapper to communicate with the driver. The language the driver is written in is anyone's guess. Probably C and Assembler. Maybe not. Maybe something else.
The driver will communicate with the graphics card (unless it's a pure software OpenGL implementation, which is possible but not a common use case during game development) where the commands will be run by the manufacturer and model specific hardware.

The point you have to concern yourself with is the C interface defined by OpenGL. Any language which can link to C functions can use OpenGL (pretty much every language which could be used in a production environment can do that). Using a thin C library as a binding any such language could also to be used to create an OpenGL implementation. Edited by BitMaster
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[/quote]
what is pure OpenGL?
[/quote]

"Pure" OpenGl, are the libraries that contain the code that is written in C, but can be used for C++ as well, or can be wrapped around for C# or any other language.
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