Random "work in progress" shots

category: general [glöplog]

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interesting idea.. but more as a joke, since it's fun to play only for a couple of minutes

added on the 2013-06-26 13:01:40 by v3nom

That was for testing something in D.

To send sprites to the GPU, you have some choice:

1 draw call per sprites | 1 draw call for many sprites

I used the second solution, and the D runtime provide some very very cool things like:

Code:std.paralellism;

so i can do (simplified a bit)

Code:


foreach(sp; std.parallel(arraySprites)) {
 sendGPU(sp); // sp is basically one sprite
}

Of course i have to ensure that the mapSubBuffer will not access the same place at the same time but it's very very easy to avoid.

I bet my C++ code by far from 200% in render count of the same struct of sprites (but i'm a poor coder you know :D).

Now, i'm very stupid cause I used 6 vertices per sprites, but with a geometry shader maybe I can use only one (i need to test that!).

What's is killing the perf now is how big a draw a picture (like a background image), it's take 100 fps on my laptop (ati mobility hd45xx)

added on the 2013-06-26 19:22:34 by Romain337

Romano58, I don't think you can thread drawcalls like that since only one thread gets to own an OpenGL context at any given time.

added on the 2013-06-27 11:44:00 by ponce

@Ponce, that work in fact you can map the buffer with the gl thread then copy data into the mapped memory with more than one thread since they involve 0 gl calls (basically copy array A to array B at offset X).

then just unmap with the gl thread and render :)

For collidable sprite (who need to be tested each with others) it didn't work well cause of course you need to access more than one sprite at a time anyway but for animated sprite it works too since you onlu access private sprites datas.

added on the 2013-06-27 11:56:12 by Romain337

Hu, i assume std.parallel is doing the things with threads. I don't know how it work really but i do see the huge perf boost ^^

added on the 2013-06-27 12:03:20 by Romain337