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Spck

Member Since 29 Dec 2012
Offline Last Active Jan 18 2013 05:17 PM
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Posts I've Made

In Topic: Adding/Removing from VBO at runtime

29 December 2012 - 05:05 PM

I really appreciate your advice, thanks!


In Topic: Adding/Removing from VBO at runtime

29 December 2012 - 02:06 PM

Thanks, everything's more clear now. I've been looking around and haven't been able to find any examples of managing the memory inside the VBO. Does anyone know any source I could look at to get a better understanding of the subject?

 

EDIT - I feel like I should explain what I'm trying to do. I'm making a simple 2D game. There might be maybe 100 quads on screen at one time, and there will only be one large texture made of mutliple .pngs. If I wanted to add a game object at run time, I'd need to add a rendering component containing the vertex data (position and texture coords).

 

Would it be best to just add/delete each game object as a new VBO? Or should I used the memory managament method Bob described with a single VBO?

 

 

I'm attempting to write code that code be the basis for further development, so I'm trying not to use any bad practices. This is purely for education purposes as I find programming, and specifically graphics programming to be incredibly fascinating.


In Topic: Adding/Removing from VBO at runtime

29 December 2012 - 04:59 AM

If I have 2 objects, both exact copies except for position, is there a simpler way to render them besides passing the data twice?

 

You can pass a translation matrix as a uniform variable to a shader and render one object twice with different matrices.

 

Just to clarify, since I'm horribly new to graphics programming. Hypothetically, if I wanted 10,000 2D right triangles all with the same texture coordinates, I would only need 1 set of data in the VBO? (edit)

 

Could you explain how this would differ if I had multiple different shapes/textures? 

2 2D shapes + same texture = 2 sets of data?

2 2D shapes + 2 textures = 4 sets of data?

3 2D shapes + 2 textures = 6 sets of data?

 

Really having a tough time wrapping my head around, thanks for the help.


In Topic: Adding/Removing from VBO at runtime

29 December 2012 - 04:46 AM

I was originally thinking just that, but I'm making a simple 2D game and only using textured quads. Everything I've been reading has basically stated it's considerably more efficient to stick them into one VBO instead of many.

 

Also, I feel like I'm missing something important here. If I have 2 objects, both exact copies except for position, is there a simpler way to render them besides passing the data twice?


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