Starting to use the TOpenGLControl...
lazarus / 5-Lazarus Extra Components

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Nafees · 2015-05-28 07:45

I've been making a game engine of my own, and till now, I've used
DirectX, but for some reason (I can't mention the reason), I've
decided to use OpenGL. I found the TOpenGLControl component, and
installed it. But how can I use it? I've tried the example
files/project, but it uses the OpenGL directly, without
TOpenGLControl. Please link a tutorial if you know about one, but not
http://wiki.lazarus.freepascal.org/OpenGL_Tutorial, it just confuses
me more and more. And one more thing: I don't want to use glut (ow
whatever it is). I just want to use TOpenGL component, but how?

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Windsurfer · 2015-05-28 08:04

Search in the examples for 'opengl'. They should get you started.

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Carver413 · 2015-05-28 23:56

I believe nxpascal works this way
https://code.google.com/p/nxpascal/

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Leledumbo · 2015-05-29 06:41

Quote from: Carver413 on May 29, 2015, 01:56:39 amI believe nxpascal
works this way
https://code.google.com/p/nxpascal/
No, it uses pure OpenGL API, not TOpenGLControl.

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wp · 2015-05-29 08:43

Quote I don't want to use glut (ow whatever it is). I just want to use
TOpenGL component, but how?   You'll have to learn OpenGL commands
anyway, TOpenGLControl just provides the required infrastructure for
your OpenGL instructions.

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Leledumbo · 2015-05-29 09:16

Quote from: wp on May 29, 2015, 10:43:16 amQuote I don't want to use
glut (ow whatever it is). I just want to use TOpenGL component, but
how?   You'll have to learn OpenGL commands anyway, TOpenGLControl
just provides the required infrastructure for your OpenGL
instructions.
In essential, glut and TOpenGLControl (and glfw or any other similar
library) provides what OpenGL doesn't provide: connection with
underlying system.

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Ocye · 2015-06-02 11:39

TOpenGlControl has an OnPaint()-Event. There you set usually the
matrix mode, define the projection type, clear buffers, do
transformations like zoom, rotate, translate, and draw your stuff.
Take a look at the examples, read tutorials such as
http://wiki.freepascal.org/OpenGL_Tutorial and ask more specific here.
Good luck!