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雑魚は多めにして、爽快感重視にしつつ・・・(´・ω・`)
早いとこ、ベースを作って、完成にもっていかないとね。
タイトルもまだ迷ってるだよなぁ。 
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terrain render

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#1 germangb   Members   

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Posted 10 December 2012 - 12:00 PM

Hey, I want to implement clipping in my terrain generator in openg.
The question is: would it be ok to use inmediate mode to perform the render?

Edited by germangb, 10 December 2012 - 12:02 PM.


#2 Steve_Segreto   Members   

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Posted 10 December 2012 - 01:44 PM

Yes. viewport clipping still works in immediate mode IIRC.

#3 germangb   Members   

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Posted 10 December 2012 - 02:07 PM

Yes. viewport clipping still works in immediate mode IIRC.


won't it make the framerate drop drastically?

#4 L. Spiro   Members   

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Posted 10 December 2012 - 09:19 PM

Using immediate mode makes slow.
It is never “okay” to use immediate mode.
Use VBO’s.


L. Spiro

#5 germangb   Members   

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Posted 11 December 2012 - 12:23 PM

Using immediate mode makes slow.
It is never “okay” to use immediate mode.
Use VBO’s.


L. Spiro


yeah I know, but what about displaylists instead of VBOs?

#6 MaxDZ8   Members   

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Posted 12 December 2012 - 01:51 AM

Display lists have been "discouraged" for a while. I stopped using GL years ago and they were already considered on their way out.
As far as I recall, they're now officially deprecated... except GL cannot say "deprecated", it says "not in the core profile" or something like that.

Previously "Krohm"


#7 L. Spiro   Members   

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Posted 12 December 2012 - 04:19 AM

If your question is purely about whether or not viewport clipping is supported with each of these rendering methods, the answer is Yes. Viewport clipping is part of the rendering pipeline and it makes no difference how the triangles got to that stage of the pipeline.

But we can’t tell you in good conscience to use immediate mode nor display lists.
Immediate mode has been deprecated for ages and is terribly horribly slow. Display lists have been deprecated for a shorter period of time but are deprecated and their use is entirely discouraged not only by people who know what they are doing but also by Khronos. Considering how easy the switch is to VBO’s from display lists, there really is no reason not to do it, so I really can’t understand why you can’t just use VBO’s and be done with it.

In future versions of OpenGL you won’t even have the choice not to use VBO’s—it will be required that you do.


L. Spiro

#8 germangb   Members   

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Posted 12 December 2012 - 09:04 AM

If your question is purely about whether or not viewport clipping is supported with each of these rendering methods, the answer is Yes. Viewport clipping is part of the rendering pipeline and it makes no difference how the triangles got to that stage of the pipeline.

But we can’t tell you in good conscience to use immediate mode nor display lists.
Immediate mode has been deprecated for ages and is terribly horribly slow. Display lists have been deprecated for a shorter period of time but are deprecated and their use is entirely discouraged not only by people who know what they are doing but also by Khronos. Considering how easy the switch is to VBO’s from display lists, there really is no reason not to do it, so I really can’t understand why you can’t just use VBO’s and be done with it.

In future versions of OpenGL you won’t even have the choice not to use VBO’s—it will be required that you do.


L. Spiro


thanks! I'll definitely go with VBOs :)

Edited by germangb, 12 December 2012 - 09:06 AM.





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