Messages

1

Graphics / Does SFML batch render draw calls?

« on: January 07, 2009, 11:49:16 am »

Hmm.. is this the same as I'm experiencing in my game ( http://www.sfml-dev.org/forum/viewtopic.php?t=830 )
I call the draw-method at least around 140 times per frame. And it goes really slow on my laptop.

Yeah, its because there is one draw-call per sprite. The graphics card can only handle around 1000 draw-calls per frame (or something like that) after that it will slow down alot.

In order to optimize things you can send a chunk (a batch) consisting of many sprites at the same time in a single draw-call. This is called batching.

Optimal size of a batch is something like 1000 vertices, and a sprite would consist of 4 vertices. (4 corners ), so maybe 250 sprites per draw-call could be rendered without any penalties in speed. 250 sprites  * 1000 draw calls = 250.000 sprites / frame on a modern gfx card.

And just like Laurent says it's in the to-do list

2

Graphics / Does SFML batch render draw calls?

« on: January 07, 2009, 11:28:22 am »

Thanks for your quick answer

I see the problem with the ordering. Nice to hear about the batching class.

So I could then maybe create a batch and add sprites to it, like:
my_batch.AddSprite( sprite )

...and when i want to draw all sprites in the batch i just call like Window.DrawBatch( my_batch )

Or ?

/TC

3

Graphics / Does SFML batch render draw calls?

« on: January 06, 2009, 05:50:34 pm »

When i draw more than around 1000 sprites each frame, the app really slows down. Why? Is there no batching of the draw calls?

I should be able to draw *a lot* more than that, should i not? Maybe I am doing something wrong.

My app is in C++, on an Intel quad 9550, with the radieon 4870 gfx card.

Thanks for any help!

/ TC